Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6605668 | Electrochimica Acta | 2016 | 7 Pages |
Abstract
Nanostructured LiNi0.5Mn1.5O4 with two different space groups (P4332 and Fd-3m) were synthesized respectively, by using ammonia-mediated carbonate precipitation. X-ray diffraction and Rietveld refinement revealed that Li/Ni antisite defects exist in ordered as well as disordered LiNi0.5Mn1.5O4 cathode materials. Although the degree of Li/Ni antisite defects in Fd-3Â m space group was larger compared with that in P4332 space group, it showed better electrochemical performance. Electrochemical impedance spectroscopy confirmed that the LiNi0.5Mn1.5O4 with an Fd-3Â m space group has lower charge transfer resistance. Combined with differential curves, we further revealed that there is a faster phase transition during the Li+ intercalation process in the LiNi0.5Mn1.5O4 with an Fd-3Â m space group than in the LiNi0.5Mn1.5O4 with a P4332 space group.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Yi-Jie Gu, Yu Li, Yun-Bo Chen, Hong-Quan Liu,