期刊
CHEMICAL ENGINEERING JOURNAL
卷 410, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128422
关键词
LiNi0.5Mn1.5O4 based lithium-ion batteries; Anhydride additives; Interphase optimization; Electronic and steric hindrance effect
资金
- National Natural Science Foundation of China [51902108, 51762006, 51964013]
- Guangxi Innovation Driven Development Subject [GUIKE AA19182020, GUIKE AA19254004]
- Natural Science Foundation of Guangdong Province [2018A030313944]
- Guangxi Technology Base and Talent Subject [GUIKE AD18126001]
- Special Fund for Guangxi Distinguished Expert
Anhydrides have been used as additives in carbonate-based electrolytes to optimize the interphase of LNMO cathode material in high-voltage lithium-ion batteries, resulting in improved cyclic stability and rate performance. Butyric anhydride (BA) shows the most suitable microstructure on the LNMO surface, inhibiting electrolyte decomposition and enhancing lithium-ion diffusion, showing potential for practical application in high voltage lithium-ion batteries.
A series of anhydrides have been used as additives in carbonate-based electrolytes for optimizing the interphase of LiNi0.5Mn1.5O4 (LNMO) cathode material to enhance the electrochemical performance of high-voltage (5 V-class) lithium-ion batteries (LIBs). The cyclic stability and rate performance of high-voltage LNMO/Li cells were remarkably enhanced by introducing the anhydride additives into electrolyte. Specifically, the LNMO cathode in the electrolyte with butyric anhydride (BA) additives exhibits high capacity retention of 84.8% after 300 cycles at 1C, and outstanding rate capability of 112 mA h g(-1) at 5C. By characterizations, it is rationally demonstrated that the cathode electrolyte interphase (CEI) can be optimized via using different anhydride additives which strongly depend on the molecular structure of anhydride, caused by the electronic and steric hindrance effects during the oxidation process. As a result, the butyric anhydride (BA) derived CEI film exhibits the most suitable microstructure on the LNMO surface, which not only can inhibit the continuous electrolyte decomposition but also facilitate the lithium-ion diffusion coefficient. Moreover, the anhydride can further consume the trace water of electrolyte to stabilize LiPF6 salt and scavenge the erosive HF. Therefore, such an electrolyte additive presents a potential which practical application in high voltage lithium-ion batteries.
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