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4264062 
Journal Article 
Borate electrolyte additives for high voltage lithium nickel manganese oxide electrode: A comparative study 
Chen, Z; Wang, Cun; Xing, L; Wang, X; Tu, W; Zhu, Y; Li, W 
2017 
Yes 
Electrochimica Acta
ISSN: 0013-4686 
249 
353-359 
WOS:000410675100040 
Trimethyl borate (TMB) and triethyl borate (TEB) are used as film-forming electrolyte additives for high voltage Lithium nickel manganese oxide (LNMO) cathode. DFT calculation and initial charge curve of LNMO reveal that the oxidation activity of TEB is higher than that of TMB. Addition of 2% TMB and 2% TEB effectively improve the capacity retention of high voltage LNMO from 23.4% to 85.3% and 72.6% after 600 cycles, respectively. The film generated in TMB-containing electrolyte shows better ability on suppressing the LNMO shedding in comparison with that of TEB, resulting in higher capacity retention of LNMO in TMB-containing electrolyte at high voltage. The superior performance of LNMO with TMB-containing electrolyte should be ascribed to its less intense film-forming reaction which generates a denser protective surface film on LNMO surface. However, why LNMO shows catalyzation effect on TEB oxidation but not on TMB is unclear, which needs further intensive investigation. (C) 2017 Elsevier Ltd. All rights reserved. 
lithium-ion battery; high voltage LiNi0.5Mn1.5O4; electrolyte additives; trimethyl borate and triethyl borate; comparative study