期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 686, 期 -, 页码 593-600出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.06.044
关键词
LiNi0.5Mn1.5O4-delta cathode material; Ex situ XAS; Structural distortion; Rate capability; Lithium ion battery
资金
- World Premier Materials of the KEIT - Korea Government Ministry of Trade, Industry and Energy
- Human Resources Development program of KETEP - Korea Government Ministry of Trade, Industry and Energy [20124010203270]
- IT R&D Program of the KEIT - Korea Government Ministry of Trade, Industry and Energy [10041856]
High voltage spinel LiNi0.5Mn1.5O4 is a promising cathode material for the practical application in high energy density lithium ion batteries. With a simple strategy of cooling rate, the degree of ordering in disordered spinel LiNi0.5Mn1.5O4-delta structure is controlled at 0.5 degrees C min(-1) for slow-cooled spinel and at 5 degrees C min(-1) for fast-cooled spinel. From XRD and FTIR analyses and charge/discharge profiles, it is confirmed that the fast-cooled spinel develops more disordered structure than the slow-cooled spinel, retaining more oxygen vacancies and more abundant Mn3+. By using in situ XRD analysis, the more disordered spinel follows the extended solid-solution reaction in favor of Li+ transport, which results in an improved rate capability. Moreover, through ex situ XAS analysis and the more quantitative results from EXAFS fitting, the local structural changes in the vicinity of Mn and Ni cations are investigated at various C-rates and smaller structural distortion in more disordered spinel is proposed to enhance the rate capability. (C) 2016 Elsevier B.V. All rights reserved.
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