• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >A study of the kinetics of lithium transport through the 'solid electrolyte interphase' (SEI) that forms on carbons used in lithium-ion batteries.
【24h】

A study of the kinetics of lithium transport through the 'solid electrolyte interphase' (SEI) that forms on carbons used in lithium-ion batteries.

机译：锂通过“固态电解质中间相”（SEI）传输的动力学研究，该相形成于锂离子电池中所用的碳上。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

One of the primary challenges facing the lithium-ion battery field is to increase the rates at which the cell can be charged and discharged. In particular, this thesis is concerned with the kinetics of lithium transport through the surface films that form on carbon in non-aqueous electrolyte. These surface films have often been described as a solid electrolyte interphase or “SEI”. To investigate the morphology and physical properties of the surface films, in situ electrochemical atomic force microscopy (ECAFM) was used. The ECAFM experiments showed that the surface films are thicker than previously believed. Cyclic voltammetry (CV), potentiostatic intermittent titration technique (PITT), constant current cycling, and electrochemical impedance spectroscopy (EIS) experiments were used to investigate the kinetics of charging and discharging of fresh and cycled cells. These experiments showed that the kinetics of a fresh cell are limited by lithium diffusion in the bulk carbon. The kinetics of a cycled cell, however, are slower than that of a fresh cell due to an increased impedance of the surface films. A model is proposed to explain how the surface films are slowing the kinetics of lithium transport. Consequences of a high impedance surface film are discussed.
机译：锂离子电池领域面临的主要挑战之一是提高电池的充电和放电速率。特别地，本论文涉及锂通过非水电解质中的碳上形成的表面膜的传输动力学。这些表面膜经常被描述为固体电解质中间相或“ SEI”。为了研究表面膜的形貌和物理性质，使用了原位电化学原子力显微镜（ECAFM）。 ECAFM实验表明，表面膜比以前认为的要厚。循环伏安法（CV），恒电位间歇滴定技术（PITT），恒流循环和电化学阻抗谱（EIS）实验用于研究新鲜和循环细胞的充电和放电动力学。这些实验表明，新鲜电池的动力学受到锂在大块碳中扩散的限制。然而，由于表面膜的阻抗增加，所以循环电池的动力学比新鲜电池慢。提出了一个模型来解释表面膜如何减慢锂传输的动力学。讨论了高阻抗表面膜的后果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号