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通过复合固体电解质实现双接口兼容,具有高转移数,用于长寿命全固态金属电池

Mengyang Cui¹, Shiyang Fu², Shisheng Yuan¹

¹Key Laboratory of Automobile Materials, Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun, 130022, China.

Small (Weinheim an der Bergstrasse, Germany)

|December 14, 2023

概括

这项研究引入了一种新的复合物固体电解质,用于更安全,高能全固态金属电池. 该材料增强了离子导电性和接口稳定性,使长期循环性能成为可能.

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
储能储能储能储能储能储能

背景情况:

固态电解质 (SSEs) 通过减轻树生长和可燃性问题,为金属电池中的液态电解质提供了更安全的替代品.
全固态金属电池 (ASSLMB) 是一个有前途的下一代储能技术,因为它们具有高能量密度和提高安全性的潜力.
开发具有高离子导电性,稳定性和出色的接口兼容性的SSE仍然是一个关键的挑战.

研究的目的:

为ASSLMBs设计和合成一种新的复合固体电解质.
调查无机和有机成分对电解质性质的协同作用.
评估电池的电化学性能和循环稳定性,使用开发的复合固体电解质.

主要方法:

使用Li6.25Al0.25La3Zr2O12 (LLZO),Al2O3和聚乙烯二化物 (PVDF) 制造复合固体电解质.
使用X射线光电子谱学 (XPS) 和密度函数理论 (DFT) 计算进行了表征.
电化学测试Li的电池和ASSLMBs与LiNi0.6Co0.2Mn0.2O2阴极和全固态硫电池.

主要成果:

复合体固体电解质表现出增强的离子导电性,高的离子转移数,以及由于协同效应而扩大的电化学窗口.
二二对称电池的稳定循环运行时间超过2500小时.
使用LiNi0.6Co0.2Mn0.2O2阴极的ASSLMB在360个循环后实现了168 mAh g-1的放电容量,而全固态硫电池的初始容量为912 mAh g-1.

结论:

合理设计的复合固体电解质为下一代高能量密度ASSLMB提供了有前途的解决方案.
LLZO,Al2O3和PVDF之间的协同相互作用显著改善了离子导电性和接口稳定性.
开发的电解质可以使ASSLMB具有长寿命和高性能,为更安全,更高效的储能解决方案铺平道路.

关键词:

复合的固体电解质复合物密度函数理论密度函数理论电化学窗户电化学窗户离子导电性的离子导电性.离子转移号码是离子转移号码.长寿的人生长寿.

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