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                                Effect of temperature on lithium-ion intercalation kinetics of LiMn1.5Ni0.5O4-positive-electrode mat
                                發布時間:2014/8/26瀏覽:1719次
                                 LiMn1.5Ni0.5O4 is synthesized by a sol–gel method
                                and the intercalation kinetics as positive electrode for lithiumion
                                batteries is investigated by EIS. LiMn1.5Ni0.5O4 particles
                                prepared via sol–gel process possess spinel phase with Fd-3m
                                space group. The charge-transfer resistance, the exchangecurrent
                                density and the solid-phase diffusion are found as a
                                function of temperature. The apparent activation energy of the
                                exchange current, the charge transfer, and the lithium diffusion
                                in solid phase are also determined, respectively. This result
                                indicates that the effect of the temperature on the cell capacity
                                and the current dependence of the capacity results mainly from
                                the enhancement of the lithium diffusion at elevated temperatures.
                                It can be concluded that LiMn1.5Ni0.5O4 cell has a bad
                                rate cycling performance at elevated temperatures before any
                                modification due to the high diffusion apparent activation
                                energy. The relevant theoretical elucidations thus provide us
                                some useful insights into the design of novel LiMn1.5Ni0.5O4-
                                based positive-electrode materials.
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