阻燃电解质中的阴离子调节工程,以实现具有吸引力的安全离子电池
Yi-Hu Feng1, Chengye Lin2,3, Hanwen Qin1
1Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, P. R. China.
Journal of the American Chemical Society
|May 1, 2025
概括
一种新的阻燃电解质提高了离子电池的安全性和性能. 这项创新稳定了阴极-电解质相间,使电池寿命更长,实际应用的容量更高.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 离子电池 (NIB) 需要提高电化学稳定性和安全性,以便大规模使用.
- 电解质分解和阴极-电解质相间反应 (CEI) 阻碍了NIB的实际实施.
- 传统碳酸盐电解质的易燃性会造成严重的安全风险.
研究的目的:
- 开发一种阻燃电解质,以提高NIB的安全性和性能.
- 研究低协调数辅溶剂对溶解结构的影响.
- 建立一个稳定的,富含F的CEI,以增强接口特性.
主要方法:
- 一种阻燃全电解质的配方.
- 使用低协调数辅溶剂调节阴离子相互作用.
- 阴极材料和全细胞的电化学特征.
主要成果:
- 建议的电解质形成一个稳定的富含F的CEI,抑制寄生反应.
- 在500个循环中,Na$_{0.95}$Ni$_{0.4}$Fe$_{0.15}$Mn$_{0.3}$Ti$_{0.15}$O$_{2}$ (NFMT) 阴极实现了169.7mAh的放电容量.
- 在0. 5°C下进行100次循环后,NFMT/硬碳袋电池显示稳定循环,容量保持86. 8%.
结论:
- 全的电解质为NIB提供了卓越的电化学稳定性和内在安全性.
- 开发的电解质可以实现快速的Na$^{+}$扩散动力学和强大的界面特性.
- 这项工作提供了一个可行的策略,用于制造高性能,阻燃电解质,用于先进的能量存储.
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