用于所有固态电池的化物固体电解质
Jianwen Liang1, Xiaona Li1, Shuo Wang2
1Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond St, London, Ontario N6A 3K7, Canada.
Journal of the American Chemical Society
|March 28, 2020
概括
研究人员开发了全固态电池的新化物固态电解质 (SSEs). 这些LiScCl3+材料具有高离子导电性和稳定性,可提高电池性能.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 高能量密度全固态电池 (ASSLB) 需要具有高导电性和稳定的固态电解质 (SSEs).
- 化物SSEs为ASSLB的发展提供了有前途的途径.
研究的目的:
- 发现和描述一个新的LiScCl3+SSE系列.
- 研究组成,结构和Li+运输特性之间的关系.
- 评估这些SSE在ASSLB中的电化学性能.
主要方法:
- 共同化的合成策略.
- 结构分析和偏好的方向观察.
- 系统地探索Li+的扩散性和离子导电性.
- 电化学窗口测定和涂/剥离试验.
- 在ASSLB中制造和测试LiCoO2/Li3ScCl6.
主要成果:
- 发现了 LiScCl3+ SSEs (x = 2.5, 3, 3.5, 4) 的室温离子导电率高达 3 × 10-3 S cm-1.
- 通过调整"x"值来证明可调节的Li+迁移,从而提高导电性和减少阻塞效应.
- Li3ScCl6具有广泛的电化学窗口 (0.9-4.3 V与Li+/Li) 和稳定的Li/剥离超过2500小时.
- 使用Li3ScCl6的ASSLB实现了104.5mAhg-1的可逆容量,周期寿命良好.
结论:
- 由于其高离子导电性和电化学稳定性,SSEs是ASSLB的可行候选物.
- LiScCl3+的组合调节可以优化 Li+的传输.
- 这些发现为高性能ASSLB设计先进的SSE提供了一种新策略.
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