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离子带电聚合物通道平面化金属阳极

Haofan Duan¹, Yu You¹, Gang Wang²

¹Hunan Provincial Key Laboratory of Thin Film Materials and Devices, School of Material Sciences and Engineering, Xiangtan University, Xiangtan, 411105, People's Republic of China.

Nano-micro letters

|January 8, 2024

概括

一种新型的酸植入的聚合物层有效地抑制了金属电池中的树脂的生长. 这一策略提高了电池的性能和寿命,为更安全的高压应用铺平了道路.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

在金属电池 (LMB) 中的树增长是由接近表面的度差异引起的,阻碍了高性能.
开发缓解树形成的策略对于推进LMB技术至关重要.

研究的目的:

构建一个酸 (LiNO3) 植入的电活性聚合物层 (PHL) 抑制树突.
通过PHL研究离子运输和树抑制的机制.
评估使用PHL的LMBs的电化学性能.

主要方法:

制造一个结晶的多态层的酸植入聚乙烯化物-co-hexafluoropropylene (PVDF-HFP).
描述PHL的结构和离子运输特性.
电化学测试Li的水晶电池,对称电池和全电池 (使用LiFePO4和LiNi0.87Co0.1Mn0.03O2阴极).

主要成果:

PHL形成离子充电通道,充当储库,释放离子以补偿电解质流量并减少树突的生长.
在PHL中伸展的分子通道加速了离子运输.
在250个循环中,立体半导体Cu电池实现了97.0%的库伦比效率;对称电池在2000多个小时内显示出稳定的/剥离.
完整细胞表现出极好的循环稳定性,具有高容量保留 (95.9%在900个循环后为LiFePO4) 和在恶劣条件下的性能 (84.3%在100个循环后保持高阴极在低N/P比率).

结论:

植入LiNO3的PHL是一种有效的策略,可以抑制树突并提高LMB的性能.
开发的方法为高压,以为基础的电解质LMB的潜在应用提供了一个简单的方法.

关键词:

人工保护层是一种人造的保护层.电化学性能电化学性能金属电池金属电池聚合物的离子通道.统一的Li存储方式

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