在聚合物电解质中的分子拥挤策略,诱导全固态电池的稳定接口.
Hong Zhang1, Jiahui Deng1, Hantao Xu1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.
Advanced materials (Deerfield Beach, Fla.)
|June 5, 2024
概括
一种分子拥挤策略通过形成保护层来稳定固态电池接口. 这提高了电池的寿命和性能,解决了聚合物电解质的关键挑战.
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:
- 不稳定的电极/电解质接口会导致固态电池中的电解质分解和树突.
- 这些接口问题限制了聚合物电解质电池的性能和寿命.
研究的目的:
- 开发一种分子拥挤策略,用于固态电池中稳定接口的现场构建.
- 为了提高聚合物电解质电池的电化学性能和稳定性.
主要方法:
- 使用15-皇冠-5调节Li+协调结构并诱导离子拥挤.
- 分析拥挤的离子的分解,形成富含LiF的被动化层.
- 进行对称Li-Li电池测试,LiFePO4蓄电池测试和NCM811蓄电池全电池测试,以及柔性袋电池评估.
主要成果:
- 在4360小时内实现对称Li-Li电池的稳定运行.
- 在全电池中,已证明 LiFePO4 redoxLi (97.18%超过 700 个循环) 和NCM811 redoxLi (83.17%超过 300 个循环) 的高容量保留.
- 在组装袋细胞中表现出极好的灵活性和稳定性 (2000+折叠,在400个周期内保持89.42%).
结论:
- 分子拥挤策略通过调节离子环境来有效调节接口化学.
- 这种方法成功地稳定了电极/电解质接口,从而提高了电池的性能和寿命.
- 这些发现为解决聚合物电解质界面挑战提供了有希望的策略,并激发了未来的界面工程.
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