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A boron-nitride based dispersive composite coating on nickel-rich layered cathodes for enhanced cycle stability and safety

While Ni-rich cathodes have been widely adopted in high-energy lithium-ion batteries, there remains room for improvement regarding their cycle stability and safety. Herein, hexagonal boron nitride (h-BN) is demonstrated, for the first time, to be an effective surface modification additive for Ni-ric...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-06, Vol.11 (25), p.1339-13319
Main Authors: Chen, Hsi, Chen, Yan-Cheng, Liu, Hao-Wen, Chang, Shu-Jui, Liao, Cheng-Hung, Parthasarathi, Senthil-Kumar, Bolloju, Satish, Weng, Yu-Ting, Lee, Jyh-Fu, Chen, Jin-Ming, Sheu, Hwo-Shuenn, Pao, Chih-Wen, Wu, Nae-Lih
Format: Article
Language:English
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Summary:While Ni-rich cathodes have been widely adopted in high-energy lithium-ion batteries, there remains room for improvement regarding their cycle stability and safety. Herein, hexagonal boron nitride (h-BN) is demonstrated, for the first time, to be an effective surface modification additive for Ni-rich cathodes. The h-BN coated Ni-rich cathode, prepared via a rapid low-temperature post-calcination process, shows markedly improved cycle stability and safety with only a trace amount of h-BN being added (1 wt% relative to the cathode oxide). Systematic synchrotron post-mortem and operando X-ray analyses reveal that the improvements could be attributed to the anion-trapping ability of the B atoms in h-BN, which mitigates surface Ni-ion reduction and carbonate accumulation caused by electrolyte corrosion during both cycling and thermal runaway. Furthermore, the high thermal conductivity of h-BN contributes to efficient heat dissipation during the early stages of thermal runaway and therefore delays the onset temperature. This work identifies h-BN as well as the concept of "anion-trapping" as promising strategies for enhancing the cycle life and safety of Ni-rich cathodes and presents an industrially facile method to accomplish such applications. A boron-nitride based dispersive composite coating, developed using a rapid low-temperature post-calcination process, has been shown to significantly improve the cycle stability and safety of Ni-rich layered cathodes.
ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta01500a