Tris(trimethylsilyl)borate as an electrolyte additive for improving interfacial stability of high voltage layered lithium-rich oxide cathode/carbonate-based electrolyte

Jianhui Li; Lidan Xing; Ruiqin Zhang; Min Chen; Zaisheng Wang; Mengqing Xu; Weishan Li

doi:10.1016/j.jpowsour.2015.03.113

Author(s)

Jianhui Li
Lidan Xing
Min Chen
Zaisheng Wang
Mengqing Xu
Weishan Li

Related Research Unit(s)

Centre for Functional Photonics

Detail(s)

Original language	English
Article number	20902
Pages (from-to)	360-366
Journal / Publication	Journal of Power Sources
Volume	285
Online published	19 Mar 2015
Publication status	Published - 1 Jul 2015

Link(s)

DOI	DOI https://doi.org/10.1016/j.jpowsour.2015.03.113 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-84925439936&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(8419978c-d135-4ecf-b85b-8fce587652a4).html

Abstract

Abstract Tris(trimethylsilyl)borate (TMSB) is used as an electrolyte additive for high voltage lithium-rich oxide cathode of lithium ion battery. The interfacial natures of Li[Li_0.2Mn_0.54N_i0.13Co_0.13]O₂/carbonate-based electrolyte are investigated with a combination of electrochemical measurements and physical characterizations. Charge/discharge tests show that the cyclic performance of Li[Li_0.2Mn_0.54N_i0.13Co_0.13]O₂ in a mixed carbonate electrolyte is significantly improved by using TMSB. After 200 cycles between 2 V and 4.8 V (vs. Li/Li⁺) at 0.5 C rate, the capacity retention of Li[Li_0.2Mn_0.54N_i0.13Co_0.13]O₂ is only 19% in the blank electrolyte, while it is improved to 74% when 0.5% TMSB is applied. The results from physical characterizations demonstrate that this excellent cyclic performance is attributed to the improved interfacial stability of Li[Li_0.2Mn_0.54N_i0.13Co_0.13]O₂/electrolyte due to the thin and protective film generated by TMSB.