分层/橄复合结构诱导稳定梯度界面化学向高温离子电池
Shaoze Tian1,2, Shiqi Liu1,2, Haozhe Du1,2
1Institute of Advanced Battery Materials and Devices, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China.
ACS nano
|November 5, 2024
概括
这项研究引入了一种新的分层/橄复合材料阴极结构,用于离子电池的LiF中间层. 这种设计增强了高温稳定性,并抑制了接口降解,以实现更安全的能量存储.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 层状氧化物阴极对于离子电池至关重要,但在高温下会出现不稳定性和寄生反应.
- 高温运行对于高能耗和高安全性储能至关重要,但仍然是一个重大挑战.
研究的目的:
- 为高温离子电池应用开发稳定的阴极材料.
- 为了减轻在恶劣条件下的多层氧化物阴极中的结构不稳定性和界面降解.
主要方法:
- 在阴极的颗粒表面设计了一个分层/橄复合结构.
- 开发了一种梯度化 (LiF) 介层,以抑制接口降解.
- 采用了接口敏感的表征和理论分析,以了解相间形成.
主要成果:
- 复合阴极表现出极好的高温循环稳定性 (90.8%在半细胞中保持300个循环,在袋细胞中超过1000个循环的95.6%).
- 与传统阴极相比,实现了大约51%的热稳定性提升.
- 揭示了由复合结构诱导的稳定介相的形成机制.
结论:
- 开发的复合结构阴极与LiF中间层显著提高了高温性能和热稳定性.
- 这种方法提供了一个有前途的策略,为极端环境的储能应用创造强大的阴极.
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