A lithium salt additive Li2ZrF6 for enhancing the electrochemical performance of high-voltage LiNi0.5Mn1.5O4 cathode

Juntian Fan, Tao Dong, Daliang Fang, Xuefeng Li, Xian’en Mo, Kaihua Wen, Shimou Chen, Suojiang Zhang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this work, Li2ZrF6, a lithium salt additive, is reported to improve the interface stability of LiNi0.5Mn1.5O4 (LNMO)/electrolyte interface under high voltage (4.9 V vs Li/Li+). Li2ZrF6 is an effective additive to serve as an in situ surface coating material for high-voltage LNMO half cells. A protective SEI layer is formed on the electrode surface due to the involvement of Li2ZrF6 during the formation of SEI layer. Charge/discharge tests show that 0.15 mol L−1 Li2ZrF6 is the optimal concentration for the LiNi0.5Mn1.5O4 electrode and it can improve the cycling performance and rate property of LNMO/Li half cells. The results obtained by electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) demonstrate that Li2ZrF6 can facilitate the formation of a thin, uniform, and stable solid electrolyte interface (SEI) layer. This layer inhibits the oxidation decomposition of the electrolyte and suppresses the dissolution of the cathode materials, resulting in improved electrochemical performances.

Original languageEnglish
Pages (from-to)2965-2972
Number of pages8
JournalIonics
Volume24
Issue number10
DOIs
StatePublished - Oct 1 2018
Externally publishedYes

Keywords

  • Additives
  • Electrolyte
  • Lithium fluorozirconate
  • Lithium ion batteries

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