期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 44, 页码 25229-25236出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b09054
关键词
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资金
- National Science Foundation of China [NSFC-51462029]
- Technology Leading Talent Program of Ningxia province [KJT2016003]
- Open Project of State Key Laboratory for Mechanical Behavior of Materials [20161811]
- Ningxia Key Research and Development Project [2015DY002]
- National First-Rate Discipline Construction Project of Ningxia [NXYLXK2017A04]
- Major Innovation Projects for Building First-Class Universities in China's Western Region [ZKZD2017006]
Phase transition can profoundly influence the electrochemical performances of cathode materials for lithium ion batteries. The intricate phase transitions upon electrochemical cycling constrain the high-rate performances of the LiNi0.5Mn1.5O4 cathode. The formation of the rocksalt-like phase causes the diffusion of Li ions asymmetric in the lithiation and delithiation reactions. The evolution of multiple cubic phases results in poor diffusivity of Li ions in the LiNi0.5Mn1.5O4. High-resolution XRD scans on the chemically delithiated samples reveal that the intricate phase transitions are effectively suppressed in Cr-doped LiNi0.5Mn1.5O4. The suppression of phase transitions not only enhances the Li ions' diffusivity inside the lattice, but also stabilizes the charge transfer interfaces by reducing lattice mismatch and alleviating structural stress during the lithiation and delithiation. Consequently, the improvement on structure evolution endows the LiNi(0.5)Mn(1.5)O(4 )with enhanced diffusion coefficient of Li ions, larger accessible capacity, and improved Coulombic efficiency.
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