Cathode Electrolyte Interphase-Forming Additive for Improving Cycling Performance and Thermal Stability of Ni-Rich LiNixCoyMn1-x-yO2 Cathode Materials
- Authors
- Lim, Da-Ae; Shin, Young-Kyeong; Seok, Jin-Hong; Hong, Dayoung; Ahn, Kyoung Ho; Lee, Chul Haeng; Kim, Dong-Won
- Issue Date
- Dec-2022
- Publisher
- AMER CHEMICAL SOC
- Keywords
- electrolyte additive; cathode electrolyte interphase; nickel-rich cathode; lithium-ion battery; cycling performance; thermal stability
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.14, no.49, pp.54688 - 54697
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 14
- Number
- 49
- Start Page
- 54688
- End Page
- 54697
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185190
- DOI
- 10.1021/acsami.2c15685
- ISSN
- 1944-8244
- Abstract
- High-capacity Ni-rich LiNixCoyMn1-x-yO2 (NCM) has been investigated as a promising cathode active material for improving the energy density of lithium-ion batteries (LIBs); however, its practical application is limited by its structural instability and low thermal stability. In this study, we synthesized tetrakis(methacryloyloxyethyl)pyrophosphate (TMAEPPi) as a cathode electrolyte interphase (CEI) additive to enhance the cycling characteristics and thermal stability of the LiNi0.8Co0.1Mn0.1O2 (NCM811) material. TMAEPPi was oxidized to form a uniform Li+-ion-conductive CEI on the cathode surface during initial cycles. A lithium-ion cell (graphite/NCM811) employing a liquid electrolyte containing 0.5 wt % TMAEPPi exhibited superior capacity retention (82.2% after 300 cycles at a 1.0 C rate) and enhanced high-rate performance compared with the cell using a baseline liquid electrolyte. The TMAEPPi-derived CEI layer on NCM811 suppressed electrolyte decomposition and reduced the microcracking of the NCM811 particles. Our results reveal that TMAEPPi is a promising additive for forming stable CEIs and thereby improving the cycling performance and thermal stability of LIBs employing high-capacity NCM cathode materials.
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