快速充电石墨阳极的板规则由三聚胺-NO3协同电解质添加剂3
Xuejiao Xu1, Xinyang Yue1, Yuanmao Chen1
1Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
Angewandte Chemie (International ed. in English)
|June 29, 2023
概括
一种新的triglyme (G3) -LiNO3协同添加剂 (GLN) 在石墨阳极上产生稳定的固体电解质介相 (SEI). 这可以防止在快速充电时出现涂层,从而提高电池的安全性和性能.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 离子电池中的石墨阳极在快速充电时容易受到危险的涂层的影响.
- 确定涂料的速度限制步骤是一个重大挑战,阻碍了有效的缓解策略.
研究的目的:
- 开发一种方法,在快速充电过程中抑制石墨阳极上的涂层.
- 为了提高固体电解质间相 (SEI) 的稳定性和均性,以增强沉积.
主要方法:
- 在商业碳酸盐电解质中引入一个三聚胺 (G3) -LiNO3协同作用的添加剂 (GLN).
- 在石墨阳极上构建具有均离子流量的弹性SEI.
- 使用电化学循环对SEI稳定性和涂层可逆性的评估.
主要成果:
- GLN添加剂形成了一个稳定的SEI与交叉链接的寡合乙烯和Li3N颗粒,促进均沉积.
- 带有5体积%GLN的石墨阳极在100个循环中表现出99.6%的涂层可逆性,即使涂层容量为51%.
- 一个1.2Ah LiFePO4的石墨袋电池与GLN添加的电解质稳定运行超过150个周期在3C.
结论:
- GLN添加剂有效地抑制了树突的形成,并提高了石墨阳极中的涂层可逆性.
- 开发的GLN战略显示了在商业离子电池中实现安全和高效的快速充电能力的重大前景.
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