The unideal electrochemical performance of manganese lithium phosphate(LiMnPO4)is caused by its low conductivity and Jahn-Teller effect during charge-discharge process.The manganese iron lithium phosphate(LiMn0.6Fe0.4PO4)is synthesized via liquid-solid phase method,its crystal structure,discharge curve characteristic and cycle performance are analyzed.The Fe is doped into the Mn site to form solid solution,the electrochemical performance of the sample at room temperature is improved.When cycled in 2.0-4.3 V,the 0.1 C rate specific discharge capacity is 156.5 mAh/g,the capacity retention rate is above 80％during 2 000 cycles at 1.0 C rate.The capacity fading is mainly due to crack formation and particle pulverization of the cathode during the cycle process.
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