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

Zhongpei Lu, Yang Liu, Xiaojun Lu, Hao Wang, Gang Yang, Yimin Chao, Weili Li, Fan Yin

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)409-418
Number of pages10
JournalJournal of Power Sources
Volume360
Early online date16 Jun 2017
DOIs
Publication statusPublished - 31 Aug 2017

Keywords

  • Li ion batteries
  • High volatge cathode material
  • Core-shell structure
  • LiNi0.5Mn1.5O4

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