对于全固态硫电池的固体催化剂与调节的相间氧化剂
Kaier Shen1, Weize Shi1, Huimin Song1
1Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
Advanced materials (Deerfield Beach, Fla.)
|February 5, 2025
概括
这项研究通过增强硫化物阴解体相间稳定性来稳定全固态硫电池 (ASSLSB). 一种新的Li6+xP1-xWxS5I电解质与WS2改善了循环寿命和容量保留,用于下一代能源存储.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 全固态硫电池 (ASSLSB) 是下一代储能设备的前景,因为它们具有低成本,高安全性和高特异能的潜力.
- 硫化物电解质为ASSLSB中的固体阴解质提供高导电性和低模量,但遭受寄生性分解和相间降解,限制循环寿命.
研究的目的:
- 通过调节硫化物阴解体的相间氧化还原可逆性来稳定ASSLSBs.
- 引入和验证一种新的硫化物电解质Li6+xP1-xWxS5I (LPWSI),以提高相间稳定性和循环性能.
主要方法:
- 一种新的硫化物电解质Li6+xP1-xWxS5I (LPWSI) 的配方和特征.
- 研究相间反应机制,重点关注WS2在调节氧化还原可逆性的作用.
- 使用LPWSI阴解体制造和环境温度ASSLSB的电化学测试.
主要成果:
- 在LPWSI电解质中存在混合离子电子导体WS2,促进有利的Li4P2S7-Li3PS4反应,防止阻碍P2S7 4-物种的积累.
- LPWSI 阴解质表现出增强的相间稳定性,导致ASSLSB的循环性能显著提高.
- 使用LPWSI的ASSLSB实现了稳定的循环,在C/5的400个循环中保持了92.2%的初始容量,初始面积容量为1.95 mA h cm-2.
- 这些细胞表现出极好的高速稳定性,在1C和2C速率下保持1000个周期的性能.
结论:
- 通过结合像WS2这样的混合离子电子导体材料来调节相间氧化还原可逆性的策略,有效地稳定了硫化物阴极体.
- 开发的LPWSI电解质为提高环境温度ASSLSB的循环寿命和性能提供了可行的解决方案.
- 这项工作为复合电极中的固体阴解质的功能提供了新的见解,并为设计用于高容量转换电极的先进电解质提供了指导方针.
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