当前位置: X-MOL 学术Batteries Supercaps › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Atomic Layer Fluorination of 5 V Class Positive Electrode Material LiCoPO4 for Enhanced Electrochemical Performance
Batteries & Supercaps ( IF 5.7 ) Pub Date : 2020-06-23 , DOI: 10.1002/batt.202000041
Sanghoon Kim 1 , Eun Jeong Kim 2, 3 , Youn Charles‐Blin 1, 4, 5 , Katia Guérin 6 , Marc Dubois 6 , Delphine Flahaut 4, 5 , Herve Martinez 4, 5 , Michaël Deschamps 5, 7 , David N. Miller 2 , John T. S. Irvine 2 , A. Robert Armstrong 2, 3 , Laure Monconduit 1, 3, 5 , Nicolas Louvain 1, 3, 5
Affiliation  

The surface fluorination of lithium cobalt phosphate (LiCoPO4, LCP) using a one‐step, room temperature processable, easily up‐scalable and dry surface modification method with XeF2 as fluorine source was developed. After fluorination, fluorine‐rich nanoparticles were observed mainly on the particle surface, which facilitates the improvement of surface stability and electrochemical performance such as cycling stability and rate capability, as the fluorinated LCP can be protected against side reactions with electrolyte or by‐products of electrolyte decomposition at high voltage (5 V). More importantly, the direct surface fluorination proved more efficient than adding a fluorinated electrolyte additive (i. e., FEC). These results suggest that surface fluorination using XeF2 is of great promise for practical applications of high voltage positive materials for lithium‐ion batteries.

中文翻译:

5 V级正极材料LiCoPO4的原子层氟化增强电化学性能

开发了一种以XeF 2为氟源的一步法,室温可加工,易于升级和干燥的表面改性方法,对磷酸钴锂(LiCoPO 4,LCP)进行表面氟化。氟化后,主要在颗粒表面观察到富含氟的纳米颗粒,这有助于改善表面稳定性和电化学性能,例如循环稳定性和倍率性能,因为可以保护氟化的LCP避免与电解质或氯仿的副产物发生副反应。高压(5 V)时电解质分解。更重要的是,事实证明直接表面氟化比添加氟化电解质添加剂(即FEC)更有效。这些结果表明使用XeF 2进行表面氟化 对于锂离子电池高压正极材料的实际应用具有巨大的希望。
更新日期:2020-06-23
down
wechat
bug