A novel electrolyte additive for improving the interfacial stability of high voltage lithium nickel manganese oxide cathode

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)71-77
Journal / PublicationJournal of Power Sources
Volume293
Online published21 May 2015
Publication statusPublished - 20 Oct 2015

Abstract

In this work, we propose a novel electrolyte additive phenyl trifluoromethyl sulfide (PTS) to improve the interfacial stability of high voltage lithium nickel manganese oxide (LiMn1.5Ni0.5O4) cathode/electrolyte. At 1C rate, addition of 0.5% PTS improves the capacity retention of LiNi0.5Mn1.5O4 from 65% to 84% after 450 cycles at room temperature, and from 64% to 95% after 100 cycles at evaluate temperature. Density functional theory calculation and experimental characterization demonstrate that PTS oxidizes preferentially to the carbonate base electrolyte, generating a SEI film, which effectively suppresses the continuous decomposition of carbonate base electrolyte and the structural destruction of LiMn1.5Ni0.5O4.

Research Area(s)

  • Electrolyte additive, High voltage lithium ion batteries, Interfacial stability, Lithium nickel manganese oxide cathode, Phenyl trifluoromethyl sulfide

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