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Electrolyte-cathode interactions in 5-V lithium-ion cells

Authors :
Atanaska Trifonova
Wolfram Kohs
Jürgen Kahr
Ningxin Zhang
Anwar Ahniyaz
Source :
Journal of Solid State Electrochemistry
Publication Year :
2017

Abstract

The electrolyte/electrode interactions on the anode side of a lithium-ion cell and the formation of the solid electrolyte interphase (SEI) have been investigated intensively in the past and are fairly well understood. Present knowledge about the reactions on the cathode side and the resulting cathode electrolyte interphase (CEI) is less detailed. In this study, the electrolyte/electrode interactions on the surface of the high-voltage cathode material LiNi0.5Mn1.5O4 (LNMO), both bare and FePO4-coated, were investigated. The gases evolving upon first time charging of the system were investigated using a GC/MS combination. The degradation products included THF, dimethyl peroxide, phosphor trifluoride, 1,3-dioxolane and dimethyl difluor silane, formed in the GC’s column as its coating reacts with HF from the experiments. Although these substances and their formation are in themselves interesting, the absence of many degradation products which have been mentioned in the existing literature is of equal interest. Our results clearly indicate that coating a cathode material can have a major influence on the amount and composition of the gaseous decomposition products in the formation phase.

Details

ISSN :
14328488
Database :
OpenAIRE
Journal :
Journal of Solid State Electrochemistry
Accession number :
edsair.doi.dedup.....fcb1a9a76a505239741d7c32d39fc5ba
Full Text :
https://doi.org/10.1007/s10008-017-3701-5