双层电解质提高了全固态金属电池的循环稳定性
Changlong Lei1,2,3, Jingyi Li1,2,3, Zhouliang Tan1,2,3
1School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
ACS applied materials & interfaces
|June 21, 2023
概括
这项研究引入了一种全新的双层固体电解质,用于全固态金属电池. 新的设计有效地抑制了树突,并改善了接口接触,为更安全,高能量密度的电池铺平了道路.
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:
- 全固态金属电池 (ASSLMBs) 提供高能量密度和安全性,但面临树生长和差的接口接触的挑战.
- 这些问题阻碍了ASSLMB在先进的储能设备中的实际应用.
研究的目的:
- 设计和制造一种新的双层复合体固体电解质 (CSE),以克服当前ASSLMB的局限性.
- 通过解决树形成和接口问题,提高ASSLMB的稳定性和性能.
主要方法:
- 制造一个双层CSE,其中包括PVDF-LiTFSI-Li1.3Al0.3Ti1.7(PO4) 3/PVDF-LiTFSI-h-BN (PLLB).
- 在CSE的特点是减少耐受PLB层的阳极接触和氧化耐用的PLA层的阴极接口.
- 用开发的电解质测试Li/Li对称细胞和LiFePO4/Li细胞.
主要成果:
- 该PLB层促进稳定的SEI膜与Li3N的形成,并防止LATP的减少.
- 该PLA层通过促进离子迁移来降低界面阻抗.
- /对称细胞在0.1 mA cm-2.2时表现出1500小时的稳定循环.
- 在250个循环后,LiFePO4/Li电池实现了88.2%的容量保留.
结论:
- 在PLLB电解质中PLA和PLB层的协同作用显著提高了ASSLMB的循环稳定性和性能.
- 这种双层电解质设计为ASSLMBs的商业化提供了一个有效的策略.
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