期刊
ELECTROCHIMICA ACTA
卷 276, 期 -, 页码 412-416出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.04.193
关键词
Tributyl borate; Additive; High-voltage lithium-ion batteries; LiCoO2 cathode; Solid electrolyte interphase
资金
- National Natural Science Foundation of China [51474243, 51574288]
- China Postdoctoral Science Foundation [2017M622598]
- Fundamental Research Funds for the Central Universities of Central South University [2018zzts429]
Tributyl borate is used as a novel electrolyte additive to improve the stability of LiCoO2 cathode operating at a high charging-cutoff voltage. The HOMO energy calculation notes that Tributyl borate would be preferentially oxidized and then generate a more uniform, extremely stable, and lower resistance cathode solid electrolyte interphase (CEI) on the LiCoO2 surface. This CEI film can effectively suppress the subsequent decomposition of electrolyte and improve cyclic stability and discharge capability of LiCoO2 cathode. With the electrolyte contained 0.5 wt.% tributyl borate, the LiCoO2/Li cells achieve a capacity retention of 85.2% after 120 cycles at 3.0-4.4 V, comparing to the capacity retention of 37.7% for the cells without tributyl borate. (C) 2018 Elsevier Ltd. All rights reserved.
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