Xianshu Wang, L. Xing, X. Liao
Aug 10, 2015
Citations
0
Influential Citations
46
Citations
Journal
Electrochimica Acta
Abstract
Abstract Trimethylboroxine (TMB) is used as electrolyte additive to improve the cyclic stability of LiCoO 2 /graphite full cell under high voltage. It is found that capacity retention of LiCoO 2 /graphite cell at 0.3C rate after 200 cycles between 3.0 ∼ 4.5 V is improved from 29 % to 66 % by applying 0.5 % (by weight) TMB in EC-based electrolyte. Charge-discharge tests on graphite/Li and LiCoO 2 /Li half cells demonstrate that the improvement in cyclic stability of the full cell results from the contribution of TMB to the enforced stability of LiCoO 2 cathode. Cyclic voltammogram shows that TMB is oxidized preferentially to the EC-based electrolyte, while physical characterizations, from SEM, TEM, FTIR and XPS, indicate that TMB helps build a thin but protective film on LiCoO 2 , which improves the interfacial stability of high voltage electrode/electrolyte.