在离子电池中用于超稳定的阳极的海绵状多孔导电聚合物涂层
Yuanyuan Yu1,2, Chen Yang1, Yan Jiang1
1College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 24, 2023
概括
一种新型的双聚氧化 (bPOD) 涂层稳定了离子电池的阳极. 这种导电聚合物提高了循环性能,并延长了电池的寿命,使下一代能储能成为可能.
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
- 聚合物科学 聚合物科学
背景情况:
- (Si) 阳极为离子电池提供了高的理论容量,但由于体积膨胀和不稳定的接口,其循环稳定性不佳.
- 保持稳定的电解质接口对于可逆循环性能和延长电池寿命至关重要.
研究的目的:
- 开发一种有效的解决方案,以稳定阳极中的电解质接口.
- 为了提高电化学性能和延长基于的离子电池的寿命.
主要方法:
- 用导电双聚氧化 (bPOD) 层涂覆颗粒.
- 研究bPOD涂层的离子电子导电特性和结构稳定性.
- 评估改性阳极的电化学性能,包括特定容量,速率能力和周期寿命.
主要成果:
- 符合bPOD涂层作为混合离子电子导体,抑制固体电解质间相 (SEI) 增长并改善离子/电子传输.
- 多孔的bPOD结构缓冲了的体积变化,确保了高的结构稳定性.
- 带有bPOD涂层的阳极在1 A g-1下进行500个循环后,具有1600 mAh g-1的可逆特定容量,在3 A g-1.1下超过1500 mAh g-1的优异速率容量.
- 实现了800个循环的循环寿命,1065mAhg-1在3Ag-1和超过80%的容量保留.
结论:
- 在现场聚合的bPOD涂层及其驱动的LiF丰富的SEI层显著提高了阳极中的储存性能.
- 这种聚合物涂层设计为高性能下一代离子电池的广泛采用提供了有希望的途径.
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