酸添加 argyrodite硫化物电解液使商业LiCoO2用于4.6V高压全固态电池的使用
Cong Dong1,2, Zhihong Bi3, Rui Li4
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
National science review
|July 9, 2025
概括
用添加的硫化物固态电解质 (SSEs) 提高了高压电池的稳定性. 这一突破提高了使用氧化阴极的全固态电池 (ASSLB) 的安全性和性能.
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:
- 硫化物固态电解质 (SSEs) 是更安全的全固态电池 (ASSLB) 的关键.
- 挑战包括低阳极稳定性和与高压阴极的界面兼容性差.
- 像LiCoO2 (LCO) 这样的高压阴极材料需要具有更好的稳定性的电解质.
研究的目的:
- 开发用于高压ASSLBs的用添加剂的阿尔吉罗硫化物SSEs (Li5.5PS4.5Cl1.5-xFx).
- 调查兴奋剂对SSE电化学稳定性和离子导电性的影响.
- 为了评估ASSLBs的性能,使用含的SSEs和LCO阴极.
主要方法:
- 一系列用剂合的阿吉罗硫化物SSEs的合成:Li5.5PS4.5Cl1.5-xFx (LPSCl1.5-xFx).
- 电化学表征,包括离子导电量测量和阳极稳定性测试.
- 使用LPSClF0.5 SSE和LCO阴极,带有或没有金属阳极的ASSLB的制造和电化学循环.
主要成果:
- 在LPSCl1.5中加入素显著提高了LPSClF0.5.5.0.5的实际氧化极限,从2.4V提高到3.5V.
- LPSClF0.5保持了高室温离子导电率为3.3mS cm-1.
- 具有LPSClF0.5的ASSLB在4.3V (700个循环后92.1%的保留) 和4.6V (300个循环后96.2%的保留) 时表现出稳定的循环.
- 在4.6V的100个循环后,ASSLB实现了137 mAh g-1.
- 在超高的LCO质量负载下,ASSLB显示出25.7 mAh cm-2的特殊面积容量.
结论:
- 兴奋剂有效地通过形成稳定的阴极-电解质间相来增强 argyrodite SSEs 的阳极稳定性.
- 开发的LPSClF0.5 SSE使高压ASSLBs与LCO阴极的稳定运行成为可能.
- 这些发现凸显了添加剂的SSEs在实用,高能量密度的ASSLB中的潜力.
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