The Large Deformation Analysis of Silicon Electrodes in Lithium-Ion Batteries

来源 :第十四届现代数学和力学学术会议 | 被引量 : 0次 | 上传用户:wufeng727
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  With the development of new lithium-ion battery anode materials, such as silicon and tin, the mechanical analysis of the active material is important.Anode material graphites the theoretical specific capacity is far below the silicons.However, silicon in completely lithium enormous deformation will happen, leads to silicon cracking and crushing, thus seriously affects cycle performance.In view of the new type of silicon electrode have the features of large deformation, this paper adopts the theory of large deformation, the electrode diffusion stress and deformation are analyzed.When considering such materials as silicon, the large deformation theory rather than general small deformation theory should be adopted.Under the condition of low concentration, according to the calculation results of single layer electrode with large deformation model, the results are basically close to the results with small deformation model.With the process of charging, the concentration will be increased in the active layer, and the electrode deformation will be more obvious than the initial states.The results of small deformation and large deformation gap are farther than the initial states.Under the framework of large deformation, lithium ion concentration distribution will be more uniform, and hoop stress decreases significantly.With large deformation model the radial stress calculation is more accurate, when compared with small deformation model.Besides, when SOC > 5%, with the increase of SOC, electrode diffusion stress is monotonically decreasing.The charging rate is smaller, the same SOC diffusion electrode stress are smaller.This result provides a principle to us when designing electrode, which is requiring the elastic modulus of current collector should be small enough.In addition, in the initial charge or discharge state, the electric current should be small.If SOC > 5% (DOC > 5%), electric current can be larger.In this paper, the bilayer electrode stress evolution process of the electrode diffusion is also analyzed with the large deformation model.
其他文献
  During the lithiation of an electrode in lithium ion batteries, intercalation reactions of lithium ions take place at the electrode-electrolyte interface.Th
会议
  薄膜-基体结构是新型高容量锂离子电池常见的结构形式。实验发现在充放电过程中存在薄膜与基体之间的脱粘分层的现象,这直接导致了电池容量的损失和阻抗的升高。本文基于
会议
  We study the dynamic characteristics of a quartz crystal resonator in thickness-shear modes with the upper surface covered by an array of cantilever micro-b
  研究试验堆可以用于生产医用中子、进行科学试验和材料考验,有些研究试验堆需要很高的中子通量.在研究试验堆燃料元件降浓计划RERTR(The Reduced Enrichment for Research
会议
  To study the development of the thermal stress in different seasons of external wall with XPS thermal insulation, based on the calculation results of the te
  本文提出新的直接方法从单个变形模式的实验数据直接获得高弹性聚合物的可压缩多轴弹性势。所给出结果在三个方面具有新颖性。其一是可以首次给出对所有变形模式的误差估
  In this paper, we investigate the oscillation of second-order half-linear neutral dynamic equations with distributed deviating arguments of the form (r(t) |
采用凸分析理论工具重新认识经典的库仑摩擦定律.首先介绍凸分析理论的若干基本概念.然后从两方面对库仑摩擦定律进行分析.一方面是将摩擦力表示为速度的集值函数,引入速度势
  随着社会的发展,人们对于大容量、安全可靠、快速充电的电池的需求越来越大。锂离子电池因为工作电压高、循环性能好、储能密度大以及无铅无毒环保等优点正在成为当前动力
会议
  With the development of society, there have growing demand for large-capacity、 secure、 reliable and fast charging batteries.Because of high voltage、 good
会议