Effect of high-voltage additives on formation of solid electrolyte interphases in lithium-ion batteries

Minjing Chen, Yunbo Huang, Zhepu Shi, Hao Luo, Zhaoping Liu, Cai Shen

Research output: Journal PublicationArticlepeer-review

2 Citations (Scopus)

Abstract

Solid electrolyte interphase (SEI) formed at the interface in lithium-ion batteries plays an important role in isolating electrons and permeating ions during charging/discharging processes. Therefore, the formation of a good interface is crucial for better battery performance. In this study, additives based on adiponitrile (ADN) and trimethyl borate (TMB) were employed to broaden the electrochemical window and form a good SEI layer. Electrochemical Atomic force microscopy (EC-AFM) was used for in situ studies of film-formation mechanisms in high-voltage electrolytes on high-temperature pyrolytic graphite (HOPG), as well as Li- and Mn-rich (LMR) materials. X-ray photoelectron spectroscopy (XPS) combined with electrochemical methods revealed a synergistic reaction between the two additives to form a more stable interfacial film during charging/discharging processes to yield assembled batteries with improved cycle performance, its capacity increased from below 100 mAh/g to 200 mAh/g after 50 cycles. In sum, these findings would have great significance for the development of high voltage lithium-ion batteries with enhanced performance.
Original languageEnglish
Article number3662
Number of pages12
JournalMaterials
Volume15
Issue number10
DOIs
Publication statusPublished - 20 May 2022

Keywords

  • solid electrolyte interphase
  • high-voltage electrolyte
  • additives
  • electrochemical atomic force microscopy
  • lithium-ion batteries

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