添加剂调节接口化学可使超高容量的LiCoO2脱极化
Guorui Zheng1,2, Hengyu Ren1, Jimin Qiu1
1School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|August 21, 2025
概括
通过稳定阴极-电解质接口, 提高了离子电池的性能. 这提高了高电压下氧化物 (LCO) 阴极的容量和循环稳定性.
科学领域:
- 材料科学
- 电化学
- 电池技术
背景情况:
- 高能量密度的离子电池需要在高电压下稳定的LiCoO2 (LCO) 阴极循环.
- 在高切断电压下,界面降解和极化限制了LCO性能.
研究的目的:
- 调查循环有机添加剂V4D4对LCO阴极性能的影响.
- 在高工作电压下增强LCO辐射Li电池的接口电荷传输和稳定性.
主要方法:
- 将V4D4添加到LCO干细胞的电解质中.
- 在4.55V的高上切断电压下进行电化学循环.
- 阴极-电解质间相 (CEI) 的形成和组成的分析.
主要成果:
- 添加V4D4将LCO容量提高到4.55V的220mAhg-1.
- V4D4通过防止HF/H2O形成和稳定晶格氧气稳定了LCO表面.
- 由化合物和LiF组成的稳定,超薄的CEI形成,降低了界面阻力.
- 在200个循环后,V4D4和FEC可以保持约97%的容量.
结论:
- 在高电压下,V4D4有效地减轻极化并提高LCO阴极的电化学性能.
- 通过V4D4形成强大的CEI对于长期循环稳定性和高能量密度至关重要.
- V4D4是开发先进高压离子电池的一个有前途的策略.
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