超离子导电空位丰富的β-Li3N电解质用于全固态金属电池的稳定循环
Weihan Li1,2, Minsi Li1,2, Shuo Wang3
1Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada.
Nature nanotechnology
|November 26, 2024
概括
研究人员开发了一种富含空位的新型β-化固态电解质 (SSE),用于先进的全固态金属电池. 这种突破性的材料能够实现高容量和电流密度,抑制树的生长,从而产生更安全,更稳定的电池.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 固态电池 固态电池是什么
背景情况:
- 推进全固态金属电池 (ASLMBs) 需要改进的固态电解质 (SSEs).
- 关键的挑战包括在高电流密度和容量下抑制树的生长.
- 在SSE晶体结构,离子导电性和机械刚性方面需要创新.
研究的目的:
- 为ASLMBs开发一种新的,高导电性和稳定的固态电解质.
- 在新的SSE中研究离子传输的机制.
- 为了展示ASLMB使用新型SSE的性能.
主要方法:
- 富含空位β-化 (β-Li3N) 的合成和表征 SSE.
- 用各种阴极对称细胞和全细胞的电化学测试 (LCO,NCM83).
- 对离子迁移机制和树突抑制能力的分析.
主要成果:
- 在空位丰富的β-Li3N SSE.中获得了高离子导电性 (2.14 × 10−3 S cm−1).
- 在对称电池中证明了高临界电流密度 (45 mA cm−2) 和容量 (7.5 mAh cm−2).
- 展现出出色的循环稳定性 (>2,000个循环) 和与金属的兼容性.
- 具有β-Li3N SSE的ASLMB显示出高容量保留 (例如,NCM83在3,500个周期中92.5%).
- 在颗粒型电池中实现了高面积容量 (高达5.0 mAh cm−2).
结论:
- 富含空位的β-Li3N是高性能ASLMB的有前途的SSE.
- 该材料具有优越的离子导电性,兼容性和空气稳定性.
- 开发的SSE能够在高电流密度和容量下稳定运行,为更安全的电池铺平了道路.
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