The Influence of Surface Modification on the Electrochemical Performance of Lithium Manganese Oxide Batteries
Spinel-type LiMn2O4 has the problems of rapid capacity decay and low discharge capacity during cycling,mainly caused by the Jahn-Teller effect,Mn dissolution,and other reasons.The study aims to improve the structural stability and electrochemical performance of spinel-type LiMn2O4 by carbon coating.The electrochemical test results showed that the discharge specific capacity of LiMn2O4 after carbon coating was significantly increased in the first cycle,and the capacity retention rate was also improved after 100 charge-discharge cycles at a current rate of 1 C.SEM image analysis showed that a uniform and dense coating layer was formed on the surface of the carbon-coated sample,which helped to improve the structural stability of the material.The conclusion points out that carbon coating technology can reduce the resistance of lithium-ion deintercalation,inhibit the dissolution of Mn,thereby improving the structural stability and electrochemical performance of LiMn2O4,and has important application prospects for the modification of lithium-ion batteries.
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