Fluorophosphorus derivative forms a beneficial film on both electrodes of high voltage lithium-ion batteries

Hongyun Yue; Zhiyuan Dong; Yange Yang; Zhanli Han; Lan Wang; Huishuang Zhang; Yanhong Yin; Xigang Zhang; Zhongtao Zhang; Shuting Yang

doi:10.1016/j.jcis.2019.10.002

Fluorophosphorus derivative forms a beneficial film on both electrodes of high voltage lithium-ion batteries

J Colloid Interface Sci. 2020 Feb 1:559:236-243. doi: 10.1016/j.jcis.2019.10.002. Epub 2019 Oct 11.

Authors

Affiliations

¹ National & Local Engineering Laboratory for Motive Power and Key Materials, College of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China.
² Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing Institute of Technology, Beijing 100081, China.
³ Henan Huarui Advanced Materials Technology Co. Ltd., Xinxiang 453007, China.
⁴ Golden Dragon Precise Copper Tube Group, Chongqing 404000, China.
⁵ Golden Dragon Precise Copper Tube Group, Chongqing 404000, China. Electronic address: zhangzhongtao@foxmail.com.
⁶ National & Local Engineering Laboratory for Motive Power and Key Materials, College of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China. Electronic address: shutingyang@foxmail.com.

PMID: 31629277
DOI: 10.1016/j.jcis.2019.10.002

Abstract

Layered lithium-rich oxides, as a series of highly promising cathode material for lithium-ion batteries, attract extensive attention due to their high specific capacity and high working potential (4.6 V vs Li/Li⁺). However, the poor interface stability of the cathode and electrolyte seriously restricts their practical application. In this article, theoretical calculations, linear sweep voltammetry and cyclic voltammetry results indicate that tris (pentafluorophenyl) phosphine (TPFPP) is a potential dual-functional electrolyte additive to solve interface problems. The TPFPP additive can decompose preferentially on the surface of both electrodes and form uniform and stable protective films, which effectively inhibit the continuous decomposition of the electrolyte and significantly alleviate the dissolution of transition metal ions during cycling. Owing to the above effects, the capacity retention and coulombic efficiency of Li_1.17Ni_0.25Mn_0.58O₂ (LLO)/graphite (Gr) cells are improved from 62.6% and 97.7% to 90.6% and 99.8% after 200 cycles at 0.3 C (1 C = 300 mA g^-1), respectively. This study provides a wide prospect for the application of lithium-rich materials in the future.

Keywords: Electrolyte additive; High voltage; Interfaces; Layered lithium-rich oxides; Tris (pentafluorophenyl) phosphine.