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Role of Additives in Formation of Solid–Electrolyte Interfaces on Carbon Electrodes and their Effect on High‐Voltage Stability
Author(s) -
Qu Weiguo,
Dorjpalam Enkhtuvshin,
Rajagopalan Ramakrishnan,
Randall Clive A.
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300858
Subject(s) - electrolyte , electrochemistry , inorganic chemistry , electrode , x ray photoelectron spectroscopy , carbon fibers , chemistry , chemical engineering , lithium (medication) , materials science , surface modification , oxide , catalysis , organic chemistry , medicine , composite number , engineering , composite material , endocrinology
The in situ modification of a lithium hexafluorophosphate‐based electrolyte using a molybdenum oxide catalyst and small amount of water (1 vol %) yields hydrolysis products such as mono‐, di‐, and alkylfluorophosphates. The electrochemical stability of ultrahigh‐purity, high‐surface‐area carbon electrodes derived from polyfurfuryl alcohol was tested using the modified electrolyte. Favorable modification of the solid electrolyte interface (SEI) layer on the activated carbon electrode increased the cyclable electrochemical voltage window (4.8–1.2 V vs. Li/Li + ). The chemical modification of the SEI layer induced by electrolyte additives was characterized by using X‐ray photoelectron spectroscopy.