Journal of Electrochemical Science and Technology

  • 제13권1호
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  • Pages.128-137
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  • 2022
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  • 2093-8551(pISSN)
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  • 2288-9221(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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Variation of Li Diffusion Coefficient during Delithiation of Spinel LiNi0.5Mn1.5O4

  • Rahim, Ahmad Syahmi Abdul (Centre for Ionics Universiti Malaya, Department of Physics, Faculty of Science, Universiti Malaya) ;
  • Kufian, Mohd Zieauddin (Centre for Ionics Universiti Malaya, Department of Physics, Faculty of Science, Universiti Malaya) ;
  • Arof, Abdul Kariem Mohd (Centre for Ionics Universiti Malaya, Department of Physics, Faculty of Science, Universiti Malaya) ;
  • Osman, Zurina (Centre for Ionics Universiti Malaya, Department of Physics, Faculty of Science, Universiti Malaya)
  • 투고 : 2021.08.13
  • 심사 : 2021.09.19
  • 발행 : 2022.02.28
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초록

For this study, the sol gel method was used to synthesize the spinel LiNi0.5Mn1.5O4 (LNMO) electrode material. Structural, morphological, electrochemical, and kinetic aspects of the LNMO have been characterized. The synthesized LNMO was indexed with the Fd3m cubic space group. The excellent capacity retention indicates that the spinel framework of LNMO has the ability to withstand high rate charge-discharge throughout long cycle tests. The Li diffusion coefficient (DLi) changes non-monotonically across three orders of magnitude, from 10-9 to 10-12 cm2 s-1 determined from GITT method. The variation of DLi seemed to be related to three oxidation reactions that happened throughout the charging process. A small dip in DLi at the beginning stage of Li deintercalation is correlated with the oxidation of Mn3+ to Mn4+. While two pronounced DLi minima at 4.7 V and 4.75 V are due to the oxidation of Ni2+/Ni3+ and Ni3+/Ni4+ respectively. The depletion of DLi at the high voltage region is attributed to the occurrence of two successive phase transformation phenomena.

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과제정보

The authors gratefully appreciate financial assistance from the Ministry of Science, Technology, and Innovation (Nanofund: 53-02-03-1089) and the Universiti Malaya (Industry-Driven Innovation Grant: PPSI-2020-CLUSTER-IDIG05).

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