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Application of Na2CO3 as a Sacrificial Electrode Additive in Na‐ion Batteries to Compensate for the Sodium Deficiency in Na2/3[Fe1/2Mn1/2]O2 将 Na2CO3 用作钠离子电池中的牺牲电极添加剂，以弥补 Na2/3[Fe1/2Mn1/2]O2中的钠含量不足

Batteries & Supercaps Pub Date : 2024-02-09 DOI: 10.1002/batt.202400009

Masayoshi Matsuzaki, R. Tatara, K. Kubota, Kazutoshi Kuroki, Tomooki Hosaka, Kazuteru Umetsu, Nobuhiro Okada, Shinichi Komaba

{"title":"Application of Na2CO3 as a Sacrificial Electrode Additive in Na‐ion Batteries to Compensate for the Sodium Deficiency in Na2/3[Fe1/2Mn1/2]O2","authors":"Masayoshi Matsuzaki, R. Tatara, K. Kubota, Kazutoshi Kuroki, Tomooki Hosaka, Kazuteru Umetsu, Nobuhiro Okada, Shinichi Komaba","doi":"10.1002/batt.202400009","DOIUrl":"https://doi.org/10.1002/batt.202400009","url":null,"abstract":"Owing to their high discharge capacities, P2‐type transition metal layered oxides have attracted attention for use as positive electrode materials in Na‐ion batteries. However, owing to the Na‐deficient compositions of these oxides, additional Na+ must be supplied using a Na‐metal negative electrode to attain a high capacity in a half‐cell configuration. In this study, solid Na2CO3 powder was introduced into the P2‐Na2/3Fe1/2Mn1/2O2 composite positive electrode as a sacrificial salt to compensate for the Na deficiency. Na+ was supplied through the electrochemical oxidative decomposition of Na2CO3 during the initial charging process; the decomposition mechanism responsible for this process was investigated in detail. Online electrochemical mass spectrometry confirmed that Na2CO3 was oxidatively decomposed in combination with the decomposition of the ethylene carbonate electrolyte. This reaction produced CO2, wherein the carbon source was derived from both Na2CO3 and the electrolyte. Consequently, Na+ supplementation improved the reversible capacity of the Na‐ion full cell. This study offers practical insights and a mechanistic understanding of the pre‐doping technique for Na‐free negative electrodes. This approach also compensates for the irreversible reductive capacity in a process that can be easily applied to practical sodium‐ and lithium‐ion batteries and capacitors.","PeriodicalId":230836,"journal":{"name":"Batteries & Supercaps","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139847698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrothermal synthesis of a graphene‐based composite enabling the fabrication of a current collector‐free microsupercapacitor with improved energy storage performance 水热法合成石墨烯基复合材料，从而制造出具有更佳储能性能的无集流器微型超级电容器

Batteries & Supercaps Pub Date : 2023-12-15 DOI: 10.1002/batt.202300430

Adnane Bouzina, René Meng, Françoise Pillier, Hubert Perrot, O. Sel, Catherine Debiemme-Chouvy

{"title":"Hydrothermal synthesis of a graphene‐based composite enabling the fabrication of a current collector‐free microsupercapacitor with improved energy storage performance","authors":"Adnane Bouzina, René Meng, Françoise Pillier, Hubert Perrot, O. Sel, Catherine Debiemme-Chouvy","doi":"10.1002/batt.202300430","DOIUrl":"https://doi.org/10.1002/batt.202300430","url":null,"abstract":"Herein, the development and the characterization of an all‐solid state symmetrical and current collector‐free microsupercapacitor based on a new reduced graphene oxide‐polydopamine (rGO‐PDA) composite are reported. The rGO‐PDA composite is synthesized by a facile, eco‐friendly and scalable hydrothermal approach in the presence of dopamine which can not only contribute to the oxygen functional groups removal from graphene oxide but also polymerize onto the rGO sheets reducing their restacking and improving the wettability of the electrode. The optimized rGO‐PDA composite material exhibits excellent capacitance and cycling stability as well as an improved rate capability compared to the pristine rGO in Na2SO4 solution. This performance enhancement can be linked to the higher transfer kinetic and lower transfer resistance values of the ions involved in the charge storage process of rGO‐PDA, as determined by ac‐electrogravimetry. Furthermore, an all‐solid‐state microsupercapacitor was prepared employing the optimized rGO‐PDA composite as electrode material. Interdigitated electrodes were obtained thanks to a CO2 laser and a Na2SO4/PVA hydrogel was employed, no current collector was used. This device achieves a noteworthy energy density of 6.2mWh·cm‐3 at a power density of 0.22W·cm‐3. Moreover, it exhibits exceptional cycling stability, retaining 104% of its initial capacity even after undergoing 10,000 cycles at 2V·s‐1.","PeriodicalId":230836,"journal":{"name":"Batteries & Supercaps","volume":"25 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Revisiting the chevrel phase: Impact of dispersion corrections on the properties of Mo6S8 for cathode applications 重新审视切维相位:色散校正对Mo6S8阴极材料性能的影响

Batteries & Supercaps Pub Date : 2021-12-01 DOI: 10.26434/chemrxiv-2021-d77zd

Katharina Helmbrecht, H. Euchner, A. Gross

{"title":"Revisiting the chevrel phase: Impact of dispersion corrections on the properties of Mo6S8 for cathode applications","authors":"Katharina Helmbrecht, H. Euchner, A. Gross","doi":"10.26434/chemrxiv-2021-d77zd","DOIUrl":"https://doi.org/10.26434/chemrxiv-2021-d77zd","url":null,"abstract":"While the Mo6S8 chevrel phase is frequently used as cathode material in Mg--ion batteries, theoretical studies on this material are comparatively scarce. The particular structure of the Mo6S8 phase, with rather loosely connected cluster entities, points to the important role of dispersion forces in this material. However, so far this aspect has been completely neglected in the discussion of Mo6S8 as cathode material for mono- and multivalent-ion batteries. In this work we therefore have studied the impact of dispersion forces on stability and kinetics of Mo6S8 intercalation compounds. For this purpose, a series of charge carriers (Li, Na, K, Mg, Ca, Zn, Al) has been investigated. Interestingly, dispersion forces are observed to only slightly affect the lattice spacing of the chevrel phase, nevertheless having a significant impact on insertion voltage and in particular on the charge carrier mobility in the material. Moreover, upon varying the charge carriers in the chevrel phase, their diffusion barriers are observed to scale linearly with the ion size, almost independent of the charge of the considered ions. This indicates a rather unique and geometry dominated diffusion mechanism in the chevrel phase. The consequences of these findings for the ion mobility in the chevrel phase will be carefully discussed.","PeriodicalId":230836,"journal":{"name":"Batteries & Supercaps","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124578502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

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