顺序排列的二极管调节阴离子衍生的固体电解质间相,用于稳定的金属化学
Baolei Xu1, Li Ma1, Wenran Wang1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|January 31, 2024
概括
本研究介绍了一种使用铁电酸 (BTOV) 的功能层,以稳定金属电池中的固体电解质间相 (SEI). 这项创新显著改善了电池循环寿命,并防止了树的生长.
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:
- (Li) 金属电池对于下一代高能量密度存储至关重要.
- 不稳定的固体电解质介相 (SEI) 形成导致阻抗,树突和电池循环能力差.
研究的目的:
- 为聚烯分离器开发一个功能层,以稳定金属电池中的SEI.
- 为了研究铁电巴泰坦酸盐 (BTOV) 与有序二极体在调节SEI化学中的作用.
主要方法:
- 在聚烯分离器中集成铁电BaTiO3 (BTOV).
- 表面表征和理论计算,以了解二极管排序和离子吸附.
- 电化学测试Li-Li电池和LiFePO4中的Li全电池.
主要成果:
- 在BTOV中的有序二极体选择性地吸附离子 (TFSI-, NO3-),促进无机SEI形成 (LiF, LiNxOy).
- 功能层促进了Li+的转移,并抑制了Li树突的生长.
- 电池实现了超过7000小时的循环运行; LiFePO4 电池超过了1760个循环.
结论:
- 铁电BTOV功能层有效调节SEI形成,以提高金属电池的性能.
- 顺序双极为控制SEI的离子分布和反应提供了一种新的策略.
- 这种方法增强了Li+运输和树抑制,导致超长的循环寿命.
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