Effect of the impurity LixNi1−xO on the electrochemical properties of 5 V cathode material LiNi0.5Mn1.5O4 |
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Authors: | GQ Liu L WenX Wang BY Ma |
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Affiliation: | a School of Material and Metallurgy, Northeastern University, Shenyang 110819, China b Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, China |
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Abstract: | The formation of impurity LixNi1−xO when synthesizing spinel LiNi0.5Mn1.5O4 using solid state reaction method, and its influence on the electrochemical properties of product LiNi0.5Mn1.5O4 were studied. The secondary phase LixNi1−xO emerges at high temperature due to oxygen deficiency for LiNi0.5Mn1.5O4 and partial reduction of Mn4+ to Mn3+ in LiNi0.5Mn1.5O4. Annealing process can diminish oxygen deficiency and inhibit impurity LixNi1−xO. The impurity reduces the specific capacity of product, but it does not have obvious negative effect on cycle performance of product. The capacity of LiNi0.5Mn1.5O4 that contains LixNi1−xO can deliver about 120 mAh g−1. |
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Keywords: | Lithium ion batteries LiNi0 5Mn1 5O4 Impurity LixNi1&minus xO Electrochemical properties |
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