期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138159
关键词
Cathode; separator; anode assembly; Lamination process; High -voltage operation; Lithium secondary battery; Vinylene carbonate
资金
- National Research Foundation of Korea (NRF) [2021R1A2C2005764]
- Electronics and Telecommunications Research Institute (ETRI) - Korea government [22ZB1200]
The study demonstrated that using a functional separator in high-voltage operating lithium-ion batteries can prevent capacity decay and extend the effect of increasing operating voltage. The mechanical interlocking adhesion between the electrode and separator reduces the formation of gas pockets, preventing an increase in gas pressure and providing stable long-term operation.
High-voltage operating is an effective route to provide upgrading the energy density of advanced lithium-ion batteries (LIBs). However, detrimental capacity decay caused by the high-voltage cycling makes it difficult to obtain stable long-term operation. Use of electrolyte additive can suppress fast capacity decay, but the prolonged effectiveness is hindered by the increased gaseous product at the electrode. In this work, we apply a functional separator having an adhesive layer on the ceramic-coated separator in high-voltage operating LIB. Mechanical interlocking adhesion between the electrode and separator prevents delamination resulting in high-capacity retention during the 500 charge-discharge cycles with the cut-off voltage of 4.5 V even with the reactive vinylene carbonate additive. This was evidenced by the X-ray inspection designed for the detection of gas pockets in pouch cells, caused by the continuous gas pressure build-up during the early cycles. Results indicate that the suppression of the gas pocket led to the prevention of capacity decay and provided a powerful strategy to extend the effect of increasing operating voltage. The approaches in this study not only highlight the importance of mechanical interlocking between the electrode and separator but also present insights into the electrode in-terfaces, which are still not fully understood.
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