Quantifying the solid electrolyte interphase stress induced capacity fading of lithium-ion batteries via a multiscale mechanical-electrochemical coupling model

IF 4.4 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
YaoLong He, Peng Xu, DengFeng Jiang, HongJiu Hu, DaWei Li, SiQi Shi
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引用次数: 0

Abstract

The solid electrolyte interphase (SEI) is widely recognized as a critical factor leading to the capacity fading of lithium-ion batteries (LIBs). Although SEI stress-related mechanical failure caused by the expansion or contraction of active materials upon cycles is well documented, previously reported SEI components and overpotential varying phenomena due to SEI stress and their effects on the electrochemical performance are poorly understood. Here, we establish a quantitative correlation between capacity fading and the SEI stress by considering its effects on side reactions, especially SEI component evolution, in a multiscale mechanical-electrochemical coupling model. Furthermore, the capacity fading behaviors of two typical cells (Li[NiMnCo]O2 as the cathode, and graphite and silicon as the anode, respectively) were adopted as numerical examples to demonstrate its potential utility and applications. Stress within the SEI was indeed found to play a predominant role in the capacity fading of the graphite and silicon anodes, resulting in 27% and 69% of the total capacity loss after 200 and 100 cycles at 1 C, respectively. This study provides valuable mechanical insights into the variations of SEI properties related to the capacity degradation and SEI optimization and design for LIBs.

通过多尺度机械-电化学耦合模型量化固态电解质相间应力引起的锂离子电池容量衰减
固体电解质相间层(SEI)被广泛认为是导致锂离子电池(LIB)容量衰减的关键因素。虽然活性材料在循环过程中膨胀或收缩导致的与 SEI 应力相关的机械故障已得到充分证实,但之前报道的 SEI 应力导致的 SEI 成分和过电位变化现象及其对电化学性能的影响却鲜为人知。在此,我们通过在多尺度机械-电化学耦合模型中考虑 SEI 应力对副反应的影响,尤其是 SEI 成分的演变,建立了容量衰减与 SEI 应力之间的定量相关性。此外,我们还以两个典型电池(阴极分别为 Li[NiMnCo]O2,阳极分别为石墨和硅)的容量衰减行为为例,展示了该模型的潜在作用和应用。研究发现,SEI 内部的应力确实在石墨和硅阳极的容量衰减中起了主要作用,在 1 C 下循环 200 次和 100 次后,分别造成 27% 和 69% 的总容量损失。这项研究为了解与容量衰减相关的 SEI 特性变化以及用于 LIB 的 SEI 优化和设计提供了宝贵的机械见解。
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来源期刊
Science China Technological Sciences
Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
10.90%
发文量
4380
审稿时长
3.3 months
期刊介绍: Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.
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