优化锂离子电池电极厚度,实现能量密度最大化

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
F. M. Nizam Uddin Khan, Mohammad G. Rasul, Nirmal K. Mandal, A. S. M. Sayem
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引用次数: 0

摘要

目前,对高容量、高能量密度锂离子电池的需求急剧增加。满足这种不断增长的需求的一种方法是设计具有更厚电极的lib。增加电极厚度可以通过降低电池中非活性物质的比例来提高锂离子电池在电池水平上的能量密度。但是,当电极厚度达到一定值后,能量密度的增加速度变慢。另一方面,相关限制的影响变得更强,降低了厚电极lib的实际适用性。因此,厚度的最佳值对于厚电极设计的实用性至关重要。本文采用响应面法(RSM)和Box-Behnken设计(BBD)对NCM锂电池的阴极和阳极厚度进行优化,以最大限度地提高电池的能量密度。此外,优化还考虑了电极孔隙率的影响,以及孔隙率与阴极和阳极厚度的相互作用。采用3水平、3因子的全因子设计,根据通过BBD实现的实验设计(DoE),生成15个模拟条件。然后,利用这些条件模拟了一个降阶电化学模型,得到了15个响应。最后,采用方差分析(ANOVA)统计技术对RSM结果进行分析和验证。结果表明,RSM-BBD优化方法,结合方差分析,成功地优化了最大能量密度的正负极厚度,尽管电化学系统存在非线性。研究结果表明,当阴极厚度为401.56µm,阳极厚度为186.36µm时,NCM锂电池的最大能量密度为292.22,而电极孔隙率优选为0.2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimization of electrode thickness of lithium-ion batteries for maximizing energy density

The demand for high capacity and high energy density lithium-ion batteries (LIBs) has drastically increased nowadays. One way of meeting that rising demand is to design LIBs with thicker electrodes. Increasing electrode thickness can enhance the energy density of LIBs at the cell level by reducing the ratio of inactive materials in the cell. However, after a certain value of electrode thickness, the rate of energy density increase becomes slower. On the other hand, the impact of associated limitations becomes stronger, reducing the practical applicability of LIBs with thicker electrodes. Hence, an optimum value of thickness is of utmost importance for the practicability of thicker electrode design. In this paper, both the cathode thickness and the anode thickness of an NCM LIB cell were optimized by applying response surface methodology (RSM) with a Box-Behnken design (BBD) to maximize the energy density. Moreover, the influence of electrode porosity, together with the interaction of porosity with cathode and anode thickness, was incorporated into the optimization. A full factorial design of 3-level, 3-factor was used to generate 15 simulation conditions in accordance with the design of experiment (DoE) achieved through BBD. Then, those conditions were used to achieve 15 responses by simulating a reduced-order electrochemical model. Finally, the statistical technique analysis of variance (ANOVA) was used to analyze and validate the results of RSM. The results show that the RSM-BBD optimization method, coupled with ANOVA, has successfully optimized the thicknesses of both positive and negative electrodes for maximum energy density, despite the nonlinearity of the electrochemical system. The findings suggest an optimized cathode thickness of 401.56 µm and anode thickness of 186.36 µm for a maximum energy density of 292.22 of an NCM LIB cell, while electrode porosity is preferred to be 0.2.

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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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