Modulation of solid electrolyte interphase of lithium-ion batteries by LiDFOB and LiBOB electrolyte additives

Shiqiang Huang, Shuwei Wang, Guohong Hu, Ling Zhi Cheong, Cai Shen

Research output: Journal PublicationArticlepeer-review

42 Citations (Scopus)

Abstract

Solid-electrolyte interphase (SEI) layer is an organic–inorganic composite layer that allows Li + transport across but blocks electron flow across and prevents solvent diffusing to electrode surface. Morphology, thickness, mechanical and chemical properties of SEI are important for safety and cycling performance of lithium-ion batteries. Herein, we employ a combination of in-situ AFM and XPS to investigate the effects of two electrolyte additives namely lithium difluoro(oxalate)borate (LiDFOB) and lithium bis(oxalato)borate (LiBOB) on SEI layer. LiDFOB is found to result in a thin but hard SEI layer containing more inorganic species (LiF and LiCO 3 ); meanwhile LiBOB promotes formation of a thick but soft SEI layer containing more organic species such as ROCO 2 Li. Findings from present study will help development of electrolyte additives that promote formation of good SEI layer.

Original languageEnglish
Pages (from-to)265-271
Number of pages7
JournalApplied Surface Science
Volume441
DOIs
Publication statusPublished - 31 May 2018
Externally publishedYes

Keywords

  • Additives
  • In-situ AFM
  • Lithium ion batteries
  • Solid electrolyte interphase

ASJC Scopus subject areas

  • Chemistry (all)
  • Condensed Matter Physics
  • Physics and Astronomy (all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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