视觉化大气依赖放松和能量存储电极的故障
Chao Wang1,2, Caixia Meng1, Shiwen Li1,2
1State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Journal of the American Chemical Society
|October 13, 2021
概括
环境大气对储能装置 (ESD) 电极性能产生重大影响. 暴露在水中会导致快速,不可逆转的石墨电极故障,而惰性或氧气大气会导致轻微的,可恢复的放松效应.
科学领域:
- 电化学
- 材料科学
- 表面化学
背景情况:
- 电极表面和接口化学对于储能装置 (ESD) 的运行和寿命至关重要.
- 了解环境大气对电极行为的影响对于开发稳定高效的ESD至关重要.
研究的目的:
- 在各种可控大气条件下动态监测和阐明石墨电极的放松和故障机制.
- 调查环境大气,特别是水在电极降解和性能方面的作用.
主要方法:
- 使用多种现场表面和接口表征技术.
- 在受控无水惰性,O2和水性大气中对石墨电极行为进行动态监测.
主要成果:
- 在无水惰性大气和O2中,由于离子再分配,石墨电极表现出可回收的阶段结构变化和电子放松,对循环的影响最小.
- 在水性大气中,发生了快速且无法恢复的故障,其特点是由水解与间隔剂引起的阶段结构降解和电子脱.
- 暴露在水中导致Al/石墨电池几乎100%的容量损失.
结论:
- 环境大气,特别是水,在ESD中石墨电极的故障机制中起着关键作用.
- 这项研究强调了水解对电极稳定性和性能的不利影响.
- 开发的方法为在环境条件下研究电池机制提供了通用方法.
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