Inhibition of transition-metal dissolution with an inert soluble product interface constructed by high-concentration electrolyte

Shumin Wu; Chunlei Li; Jingjing Zhang; Peng Wang; Dongni Zhao; Yin Quan; Jinlong Sun; Xiaoling Cui; Shiyou Li

doi:10.1016/j.isci.2023.107052

Inhibition of transition-metal dissolution with an inert soluble product interface constructed by high-concentration electrolyte

iScience. 2023 Jun 7;26(7):107052. doi: 10.1016/j.isci.2023.107052. eCollection 2023 Jul 21.

Authors

Shumin Wu^{1

2}, Chunlei Li^{1

2

3}, Jingjing Zhang^{1

2}, Peng Wang^{1

2}, Dongni Zhao^{1

2

3}, Yin Quan^{1

2}, Jinlong Sun^{1

2}, Xiaoling Cui^{1

2

3}, Shiyou Li^{1

2

3}

Affiliations

¹ School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, P.R. China.
² Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou 730050, P.R. China.
³ Gansu Engineering Laboratory of Electrolyte Material for Lithium-ion Battery, Baiyin 730050, P. R. China.

Abstract

The formation of a compact and stable cathode electrolyte interphase (CEI) film is a promising way to improve the high voltage resistance of lithium-ion batteries (LIBs). However, challenges arise due to the corrosion of hydrogen fluoride (HF) and the dissolution of transition metal ions (TMs) in harsh conditions. To address this issue, researchers have constructed an anion-derived CEI film enriched with LiF and LiPO₂F₂ soluble product on the surface of LiNi_0.5Mn_1.5O₄ (LNMO) cathode in highly concentrated electrolytes (HCEs). The strong binding of LiF and LiPO₂F₂ generated an inert LiPO₂F₂ soluble product interface, which inhibited HF corrosion and maintained the spinel structure of LNMO, contributing to a capacity retention of 92% after 200 cycles at 55°C in the resulting cell with a soluble LiPO₂F₂-containing CEI film. This new approach sheds light on improving the electrode/electrolyte interface for high-energy LIBs.

Keywords: Computational chemistry; Electrochemistry; Materials characterization.