Journal
JOURNAL OF POWER SOURCES
Volume 509, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230361
Keywords
Lithium-ion battery; High voltage; High temperature; Electrolyte additive; Isatin anhydride
Funding
- National Natural Science Foundation of China [52003307, 21901051]
- Guangdong Science and Technology Special Fund (Major Projects + Task List) [2019067]
- Natural Science Foundation of Guangdong Province [2018A0303130204]
- Guangxi Scientific and Technological Innovation Base and Personnel Project of China [GUI-KEAD19110069]
- Jieyang Science and Technology Plan Project [2019031]
- Guangdong Key Laboratory of Radioactive and Rare Resource Utilization [2018B030322009]
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The novel multifunctional electrolyte additive IAn can significantly enhance the long-term cycling performance of high-voltage Ni-rich lithium-ion batteries, especially under high temperature conditions. The formation of stable SEI films at electrode surfaces helps restrain electrolyte decomposition and protect material structures, thereby improving the electrochemical performance.
High-voltage Ni-rich based lithium-ion batteries with long-term cycled life can be obtained by reasonable regulation of the nonaqueous electrolyte components. Herein, a novel multifunctional electrolyte additive, isatin anhydride (IAn) is dedicated to construct stable solid-electrolyte-interface (SEI) films on the both Ni-rich layered LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode and graphite anode in a high-voltage pouch cell. Electrochemical tests reveal that IAn can significantly enhance the long-term cycling performance of the graphite/NCM523 full-cell at high voltage and high temperature. The pouch cell containing 1.0 wt% IAn shows an excellent capacity retention of 92.3% after 200 cycles between 3.0 and 4.5 Vat 1.0C under 45 degrees C condition. In contrast, the cell without IAn appears a lower cycle performance after 192 cycles while the capacity retention decrease to 18.3%. Such obvious improvement of electrochemical performance contributes from the formation of thin and stable SEI films at two electrodes' surfaces, leading to restraining the electrolyte decomposition and protecting material structures on the both cathode and anode.
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