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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Abstract

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
URI:	https://ueaeprints.uea.ac.uk/id/eprint/63800
DOI:	10.1016/j.jpowsour.2017.06.036

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