科研之友
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摘要
In order to overcome the severe capacity decay of LiMn2O4 at high temperature, TiN is used as an active materials additive in this paper. The XRD and XPS test results indicate that the TiN can effectively prevent Mn from dissolving in electrolyte; galvanostatic charge-discharge test shows that LiMn2O4 electrode with TiN exhibits remarkably improved capacity retention at high temperature with capacity of 105.1 mAh g(-1) at 1 C in the first cycle at 55 degrees C and the capacity maintains 88.9% retention after 150 cycles. And the electrochemical impedance spectroscopy result demonstrates TiN's effectiveness in easing the increase of charge-transfer resistance during cycling. Therefore, we can conclude that TiN, as an addictive, made obvious contribution to the greatly improved electrochemical cycling performance of LiMn2O4.
