Abstract
LiMn1-xCrxPO4/C (x = 0, 0.01, 0.03, and 0.05) compounds are synthesized by a sol–gel combined ball milling method. The effects of Cr doping on the structure, morphology, and electrochemical performance of LiMnPO4 are investigated. XRD analysis results indicate that all the samples exhibit the single LiMnPO4 phase and Cr ions substitute on Mn site (x ≤ 0.03), with charge compensating vacancies on Li site. The vacancies are of benefit to improving the electronic conductivity of LiMnPO4. SEM studies reveal that Cr doping can effectively inhibit the aggregation of LiMnPO4 particles. Electrochemical tests show that the Cr-doped samples exhibit higher initial capacities and better cycling performance than the undoped one. LiMn0.97Cr0.03PO4/C exhibit the best electrochemical performance that the first specific discharge capacity is 132.4 mAh g−1 at 0.1 C rate, and the capacity retention is 94.8 % after 30 cycles.
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