Journal of Power Sources Advances最新文献

{"title":"The implementation of a voltage-based tunneling mechanism in aging models for lithium-ion batteries","authors":"","doi":"10.1016/j.powera.2024.100157","DOIUrl":"10.1016/j.powera.2024.100157","url":null,"abstract":"<div><p>Precise explanation and prediction of the aging behavior of lithium-ion batteries (LIBs) is essential for improving battery management systems. It is quickly becoming a hotspot in battery research. Solid electrolyte interphase (SEI) growth is regarded as the dominant factor of capacity losses in LIBs. However, the growth of SEI is yet to be understood in more detail due to its complexity. In the present paper, an advanced voltage-based aging model using an electron tunneling mechanism is proposed and validated by experiments. This model employs the electrode voltage as an input parameter for the first time with a tunneling mechanism, which is more flexible than existing energy-based approaches and can be used to predict the electron tunneling (dis)charge cycles. The proposed model is used to simulate tunneling current profiles during (dis)charging of graphite, LTO, and blend Si/C negative electrodes. The simulation results prove and explain that lower states-of-charge of LIBs mitigate electron tunneling and SEI growth, further reducing calendar aging. That work can be used to describe battery capacity losses better and it is crucial for predicting the state-of-health of LIBs.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000234/pdfft?md5=9f4d36d84489a8287ddbd6e0fad46b5e&pid=1-s2.0-S2666248524000234-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electronic structure evolution upon lithiation: A Li K-edge study of silicon oxide anode through X-ray Raman spectroscopy","authors":"","doi":"10.1016/j.powera.2024.100155","DOIUrl":"10.1016/j.powera.2024.100155","url":null,"abstract":"<div><p>The comprehensive understanding of the local structural changes surrounding lithium in lithium silicate (Li_xSiO_y) and silicide (Li_xSi) within Li/SiO_x batteries during the reversible structural transformations has been hindered by the limitations of current methodologies. In this work, the evolution of electronic structure at various lithiation stages has been addressed well by examining the Li K-edge spectra through X-ray Raman spectroscopy (XRS). The features observed in the Li K-edge XRS spectra provide insights into the development and alteration of Li_xSiO_y, which emerges in the initial phases and may be accompanied by a reduction in the ionicity of Li–O bonding during lithiation. These features also agree well with the accompanying FDMNES code simulation. The correlation between electrochemical mechanisms and spectral characteristics is further explored by applying pseudo-Voigt peaks and cumulative pseudo-Voigt functions for fitting purposes. The absence of a significant edge shift indicates a similarity in the electronic structure of Li_xSi throughout lithiation, and no evidence of Li₂O formation has also been observed. The Li K-edge XRS spectra exhibit strong agreement with the electrochemical behavior, establishing it as a valuable tool for investigating the evolution of electronic structure in Li/SiO_x batteries.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000210/pdfft?md5=76b32eabf2e3c2de1d453a662d44a423&pid=1-s2.0-S2666248524000210-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141962309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ionic liquids with sulfinyl-functionalized imide anion and their lithium electrolytes: (I) Physical and electrochemical properties","authors":"","doi":"10.1016/j.powera.2024.100154","DOIUrl":"10.1016/j.powera.2024.100154","url":null,"abstract":"<div><p>Imide-based ionic liquids (ILs) are intriguing candidates for constructing safer electrolytes and better rechargeable batteries. In this work, a sulfinyl-functionalized imide anion, (trifluoromethanesulfinyl) (trifluoromethanesulfonyl)imide anion ([(CF₃SO) (CF₃SO₂)N]⁻, [qTFSI]⁻), is proposed as negative charge for building low-melting ILs and high-performing electrolytes. The physicochemical properties of [qTFSI]-based ILs and their electrolytes are extensively characterized, and the reference systems with the classic sulfonimide anion, bis(trifluoromethanesulfonyl)imide anion ([(CF₃SO₂)₂N]⁻, [TFSI]⁻) are also comparatively investigated. It has been revealed that the [qTFSI]⁻ anion shows lesser extent of negative charge delocalization as compared to the reference [TFSI]⁻ anion, which is responsible for slightly stronger interactions between IL cations and the sulfinyl-functionalized anion. The asymmetric feature of the [qTFSI]⁻ anion contributes to lower glass and melting transitions of the corresponding ILs vs. [TFSI]-based ones, which effectively expands the operational temperature of the rechargeable batteries. Furthermore, the co-utilization of [qTFSI]⁻ with [TFSI]⁻ is found to improve the electrochemical compatibility of Li metal anode with the IL-based electrolytes, sustaining better cycling stability of the Li symmetric cells. The current work offers an elegant approach for the design of new anions for interface-favorable ILs and their electrolytes.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000209/pdfft?md5=7c9b6e2215ce8193cb108128d1d0697a&pid=1-s2.0-S2666248524000209-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141637166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tri-sulfur radical trapping in lithium–sulfur batteries","authors":"Roza Bouchal ,&nbsp;Clément Pechberty ,&nbsp;Athmane Boulaoued ,&nbsp;Niklas Lindahl ,&nbsp;Patrik Johansson","doi":"10.1016/j.powera.2024.100153","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100153","url":null,"abstract":"<div><p>Lithium-sulfur (Li–S) batteries have emerged as a next-generation battery technology owing to their prospects of high capacity and energy density. They, however, suffer from rapid capacity decay due to the shuttling of reaction intermediate species: Li polysulfides (LiPSs). One of the more important and intriguing PSs is the tri-sulfur radical (<span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span>), observed mainly in high-donor number (DN) solvent-based electrolytes. Although this radical has been proposed to be crucial to full active material (AM) utilization, there is currently no direct evidence of the impact of <span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span> on cycling stability. To gain more insight into the role of the <span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span>, we studied the use of radical traps in low and high DN solvent-based electrolytes by <em>operando</em> Raman spectroscopy. The traps were based on nitrone and iminium cation, and <span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span> was indeed successfully trapped in <em>ex situ</em> analysis. However, it was the ionic liquid-based trap, specifically pyridinium, that effectively suppressed <span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span> during battery operation. Overall, the PS formation was altered in the presence of the traps and we confirmed the impact of <span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span> formation on the Li–S battery redox reactions and show how the trapping correlates with Li–S battery performance. Therefore, stabilization of the <span><math><mrow><msubsup><mi>S</mi><mn>3</mn><mrow><mo>•</mo><mo>−</mo></mrow></msubsup></mrow></math></span> might be a path to improved Li–S batteries.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000192/pdfft?md5=d3bf5ed5febce78519798da3441e763a&pid=1-s2.0-S2666248524000192-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141484911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Establishing Li-acetylide (Li2C2) as functional element in solid-electrolyte interphases in lithium-ion batteries","authors":"Viviane Maccio-Figgemeier ,&nbsp;Gebrekidan Gebresilassie Eshetu ,&nbsp;Damian Mroz ,&nbsp;Hyunsang Joo ,&nbsp;Egbert Figgemeier","doi":"10.1016/j.powera.2024.100152","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100152","url":null,"abstract":"<div><p>Previously, lithium-acetylide (Li₂C₂) had been identified as electrolyte degradation product on lithium-metal based electrodes using Raman spectroscopy. This raised the question, if Li₂C₂ is also be formed on graphitic electrodes in lithium-ion batteries without lithium metal present. In order to shed light on this research question, we performed a series of in situ Raman experiments with graphitic electrodes in half- and full-cell configuration. The recorded cell potential dependent spectra clearly prove the presence of Li₂C₂ in the lithiated state of the electrodes, but the according peak vanishes when delithiating. This observation indicates a somewhat reversible process involving Li₂C₂. Several chemical/electrochemical reactions are in question to contribute to this effect. With respect to its properties and potential role in the solid-electrolyte interphase (SEI) DFT calculations of Li₂C₂-nanoclusters were performed, which revealed an exceptionally low energy band gap, hence a remarkable electric conductivity. In conjunction with a relatively high ionic conductivity, Li₂C₂ appears to play a key role in the degradation of lithium-ion batteries, which had not yet been revealed nor taken into account in simulations of the interphase.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000180/pdfft?md5=841d9ceaf9a647e74a350bdfb42703d7&pid=1-s2.0-S2666248524000180-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141484912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"State of charge estimation with hysteresis-prone open circuit voltage in lithium-ion batteries using the trajectory correction hysteresis (TCH) model","authors":"Jakob Schmitt,&nbsp;Ivo Horstkötter,&nbsp;Bernard Bäker","doi":"10.1016/j.powera.2024.100151","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100151","url":null,"abstract":"<div><p>State-of-the-art lithium-ion cell chemistries with pronounced open-circuit voltage hysteresis (OCV), characterised by asymmetry and directional dependence, present a challenge for estimating the state of charge (SOC). Without understanding the hysteresis behaviour, OCV measurement points that lie within the hysteresis window cannot be used for SOC correction. After obtaining the data efficiency of the trajectory correction hysteresis (TCH) model with the introduction of the transfer fit (TF) method, this work applies the TF TCH for OCV-based SOC correction. The TF method plays a key role as it enables the cell-specific adaptation of an existing TCH model - ageing update is achieved with solely 12 (SOC/OCV) measurement points. With the precise hysteresis model, the developed framework successfully corrects the faulty SOC history, which could originate from a vehicle data logger. Given that two OCV measurement points are available that arbitrarily lie within the SOC history, the SOC correction is achieved by minimising the voltage deviation between the measurement points and the TCH model’s simulation. Identifying the two SOC parameters shift and scale enables subsequent SOC estimation until an additional OCV measurement is available for a further update. The functionality of the presented SOC correction framework is demonstrated using two validation profiles.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000179/pdfft?md5=df1f989419b231124ebdbb3a25c57dc9&pid=1-s2.0-S2666248524000179-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141292045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hot gas impingement and radiation on neighboring surfaces from venting and combustion in a package of 18650 cells","authors":"Jason K. Ostanek ,&nbsp;Nicholas R. Baehl ,&nbsp;Mohammad Parhizi ,&nbsp;Judith A. Jeevarajan","doi":"10.1016/j.powera.2024.100150","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100150","url":null,"abstract":"<div><p>A quasi-steady, CFD-based modeling approach is employed to investigate the heat loading within a small package of twenty-five 18650 Li-ion cells. The quasi-steady approach allows for computationally efficient simulations to capture the compressible and turbulent flow field through the safety vent structure and out into the space surrounding a failing cell. Combustion of vent gases leads to high heat loading on neighboring cells and nearby surfaces. Heat transfer mechanisms within the enclosure include convection from hot gases, radiation from the participating medium, and radiation exchange between surfaces. Simulations provide insight into the magnitude of each heat transfer mechanism, and the spatial distribution of heat flux on nearby cells and surfaces within the pack. The complex geometry of the safety vent geometry resulted in an asymmetric jet flow pattern, which induces highly localized impingement heat transfer on specific cells within the enclosure. Radiation from hot surfaces was more significant than radiation from hot gases and soot to neighboring cells. The quasi-steady simulations may be used in the future to develop reduced-order heat transfer models that include the effects of venting and combustion on propagating failure.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000167/pdfft?md5=6e1709a7d32663c32ceee68f69ab779f&pid=1-s2.0-S2666248524000167-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141239530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Harnessing melt processing for the preparation of mechanically robust thermoplastic vulcanizate electrolytes","authors":"Léa Caradant ,&nbsp;Gabrielle Foran ,&nbsp;David Lepage ,&nbsp;Paul Nicolle ,&nbsp;Arnaud Prébé ,&nbsp;David Aymé-Perrot ,&nbsp;Mickaël Dollé","doi":"10.1016/j.powera.2024.100149","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100149","url":null,"abstract":"<div><p>We report a new type of polymer blend electrolyte based on the principle of thermoplastic vulcanizates (TPV). TPV materials have been extensively used in the automotive and manufacturing sectors. However, to the best of our knowledge, TPV-based electrolytes have yet to be produced. These electrolytes, obtained via melt-processing, combine the high ionic conductivity and processibility of a thermoplastic phase with the improved mechanical strength of a crosslinked elastomeric phase. TPV electrolytes prepared with poly(caprolactone) (PCL) (thermoplastic phase) and hydrogenated nitrile butadiene rubber (HNBR) (elastomeric phase) are presented in this work. These materials deliver promising results in terms of ionic conductivity, electrochemical stability and mechanical strength. Further improvements in ionic conductivity are obtained by doping the TPV electrolyte with a flame-retardant solvent, triethyl phosphate. The crosslinked nature of the TPV allows both mechanical strength and electrochemical stability to be conserved upon doping which is not possible in non-crosslinked polymer blend electrolytes prepared with PCL and HNBR.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000155/pdfft?md5=9aeb903e290e8774f7b298e31262fd8e&pid=1-s2.0-S2666248524000155-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141239529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of commercial 18650 and 26700 sodium-ion cells and comparison with well-established lithium-ion cells","authors":"Katharina Bischof ,&nbsp;Vittorio Marangon ,&nbsp;Michael Kasper ,&nbsp;Aislim Aracil Regalado ,&nbsp;Margret Wohlfahrt-Mehrens ,&nbsp;Markus Hölzle ,&nbsp;Dominic Bresser ,&nbsp;Thomas Waldmann","doi":"10.1016/j.powera.2024.100148","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100148","url":null,"abstract":"<div><p>Recently, the first sodium-ion cells have been commercialized and have become available for consumers. Given, moreover, the exciting announcements by several producers of such battery cells, it is of great interest to analyze these first commercial cells in order to understand which materials are used and how these cells are designed. Herein, two types of commercially available sodium-ion battery cells (cylindrical 1.5 Ah 18650 and 3.5 Ah 26700 cells) are investigated regarding (i) their electrode chemistry, (ii) their thermal properties upon discharge as a function of the applied C rate, (iii) the available specific energy, and (iv) their cell impedance. The data are correlated with the electrode thickness and electrode area obtained from an <em>ex situ</em> (ante-mortem) analysis of the 18650 cells, and discussed in comparison with the performance metrics reported for commercial lithium-ion cells. This comparison reveals that the herein studied 18650 sodium-ion cells (hard carbon⎪⎪Na_xNi_yFe_zMn_1-y-zO₂) provide a comparable or even higher specific energy (∼128 Wh kg⁻¹) than that of graphite⎪⎪LiFePO₄ lithium-ion cells.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000143/pdfft?md5=c49f573427b834c7acc765be9fc797ac&pid=1-s2.0-S2666248524000143-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141068198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rest in phase transition: Should charging habits in next generation EVs be adapted?","authors":"Nils Peter Wagner","doi":"10.1016/j.powera.2024.100147","DOIUrl":"https://doi.org/10.1016/j.powera.2024.100147","url":null,"abstract":"<div><p>Nickel-rich cathode materials are a popular cathode for high energy lithium ion batteries in the current and next generation of electric vehicles. While nickel-rich cathodes offer high energy density, their cycle-life is compromised due to several factors directly related to their (de)lithiation behavior. At high state of charge the nickel-rich cathode experiences a hexagonal-hexagonal transition which is accompanied by drastic changes in the unit cell parameters. This phenomenon is detrimental for cycle-life of a battery cell. This work elucidates on the effect of storing LiNi_0.8Mn_0.1Co_0.1O₂‖Graphite cells at 95 % state of charge corresponding to the above-mentioned transition for 10 h every six cycles. The results are compared to cells cycled without a rest at high state of charge and cells cycled to 100 % state of charge. Analysis of the obtained cycling data shows that resting lithium ion cells based nickel-rich cathode based cells is detrimental leading to higher impedance growth and capacity decay than cycling to 100 % state of charge.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666248524000131/pdfft?md5=4829a613eb2c785df53623f503087774&pid=1-s2.0-S2666248524000131-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140647693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}