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Theory of Metallic Conduction01:17

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原子扩散性:全固态电池合金阳极的临界电流密度和循环稳定性的关键描述因素

Guoyong Xue1,2, Jie Lu1,2, Zhe-Tao Sun3

  • 1School of Chemistry and Chemical Engineering, in-situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED) and Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.

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合金阳极改善了全固态电池 (ASSLB) 的沉积. 在LiGa阳极中的高扩散性使得记录临界电流密度 (CCD) 实现稳定的ASSLB性能.

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科学领域:

  • 材料科学
  • 电化学
  • 电池技术

背景情况:

  • 合金阳极为没有树的全固态电池 (ASSLB) 提供了潜力.
  • 在ASSLB中,电流合金阳极的临界电流密度 (CCD) 不足以适用于实际应用.
  • 对于ASSLB的合金阳极中控制CCD的因素尚未完全理解.

研究的目的:

  • 为ASSLB开发一种解释合金阳极的临界电流密度 (CCD) 的模型.
  • 确定控制沉积行为和电池性能的关键参数.
  • 优化合金阳极设计以提高ASSLB的稳定性和效率.

主要方法:

  • 提出了一个扩散控制的沉积模型.
  • 使用多模式表征来分析原子扩散性.
  • 使用LiGa合金阳极和Li6PS5Cl固体电解质制造和测试的ASSLB.

主要成果:

  • 合金阳极中的原子扩散性被确定为CCD和循环稳定的关键描述因素.
  • 合金阳极显示了超过50 mA cm-2的创纪录的CCD.
  • 具有LiGa阳极的ASSLB在1000个周期内表现稳定,容量保持80%.

结论:

  • 原子扩散性是控制合金阳极中的沉积的关键因素.
  • 开发的扩散控制模型为ASSLB性能提供了统一的描述符.
  • 合金阳极显著促进了实用,高性能ASSLB的发展.