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在聚合物固体电解质中储存电荷的多功能建立,用于在金属电池中为LiF丰富的SEI产生增强的电荷传输

Weizhong Liang¹, Xuanyi Zhou¹, Biao Zhang¹

¹National-Provincial Laboratory of Special Function Thin Film Materials, School of Materials Science and Engineering, Xiangtan University, Hunan, 411105, China.

Angewandte Chemie (International ed. in English)

|March 2, 2024

概括

一种新型多孔有机聚合物通过增加电荷转移来增强化固态电解质接口. 这提高了电池的稳定性和性能,使其能够稳定运行超过2700小时.

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
聚合物科学聚合物科学

背景情况:

固态电解质接口 (SEI) 对电池性能至关重要.
在SEI中增加化 (LiF) 含量有助于均的沉积,并抑制树的生长.
目前的LiF SEI建造方法依赖于填充物极群的盐分解,对电荷转移的作用的研究有限.

研究的目的:

为了研究增强电荷转移对盐分解和LiF SEI形成的影响.
开发一种新的多孔有机聚合物 (POF) 来改进SEI结构.
为了评估使用新型聚合物复合物固体电解质的电池的性能.

主要方法:

合成了一种具有"电荷储存"特性的多孔有机聚合物 (POF).
将POF添加到聚合物复合物固体电解质中.
使用电化学分析研究了盐 (LiTFSI) 分解和LiF形成期间的电荷转移机制.

主要成果:

与单个氨酸 (0.423e−) 相比,POF促进了显著更高的电荷转移 (1.147e−),促进了富含LiF的SEI形成.
具有PEO-POF的Li//Li对称电池在60°C下稳定运行超过2700小时,在0.1 mA/cm2下稳定运行超过1100小时.
FePO4//PEO-POF//电池表现出极好的循环性能,在2C时750个循环后保持80%的容量,在1C时300个循环后保持96%的容量.

结论:

通过增强的电荷传输,POF的"电荷存储"能力有效地促进了富含LiF的SEI形成.
开发的聚合物复合物固体电解质显著提高了电池的循环稳定性和性能.
电荷转移的概念为设计高性能固态电池提供了一个有希望的新策略.

关键词:

金属电池金属电池生命的生命生命的生命充电储存是指充电储存的使用方式.转移费用转移费用转移费用转移费用固体聚合物电解质的电解质.

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