An active core-shell nanoscale design for high voltage cathode of lithium storage devices

Lu, Zhongpei, Liu, Yang, Lu, Xiaojun, Wang, Hao, Yang, Gang, Chao, Yimin, Li, Weili and Yin, Fan (2017) An active core-shell nanoscale design for high voltage cathode of lithium storage devices. Journal of Power Sources, 360. pp. 409-418. ISSN 0378-7753

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Spinel LiNi0.5Mn1.5O4 (LNM) is a potential high-voltage cathode for commercial lithium-ion batteries (LIBs). Maintaining an appropriate amount of Mn3+ in LNM is necessary to improve the rate performance. However, Mn3+ dissolution in the interface of LNM and electrolyte leads to the fast capacity degradation. Therefore, designing a cathode to prevent Mn3+ loss during charge/discharge is important for high performance LIBs. Here we present an active core-shell design with coating another high-voltage cathode material LiCoPO4 (LCP) on the surface of LNM nanoparticles. The LCP layer can simultaneously induce Mn3+ ions at the interface between LCP and LNM, and act as a stable shell to prevent the loss of Mn3+. The optimized sample LNM@5%LCP possesses 128 mAh g−1 at 0.5 C and 115 mAh g−1 at 20 C rate, and maintains 96% of the initial capacity operated at 55 °C over 100 cycles.

Item Type: Article
Uncontrolled Keywords: li ion batteries,high volatge cathode material,core-shell structure,lini0.5mn1.5o4
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Pure Connector
Date Deposited: 22 Jun 2017 05:05
Last Modified: 18 Nov 2020 00:44
DOI: 10.1016/j.jpowsour.2017.06.036

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