Mo Doped in Manganese Basal Oxides to Construct Stable Cathode Materials of Potassium Ion Batteries
Manganese-based layered oxides have the advantages of high specific capacity and low cost,and are one of the most promising anode materials for potassium ion batteries.However,due to the Jahn-Teller effect resulting from Mn3+,the material is prone to irreversible phase transition as well as structural collapse during the cycling process,which leads to poor cycling stability of the battery.In order to stabilize the interlayer structure,K0.5Mn0.95Mo0.05O2 was prepared as the cathode material in potassium-ion batteries by the solid-state method with Mo-doped P3-type K0.5MnO2.The assembled half-cells had an initial discharge specific capacity of 73.69 mA·h/g at a current density of 20 mA/g,and a specific capacity of 66.16 mA·h/g after 30 cycles,it had a retention rate of 90% .At a current density of 100 mA/g,the initial discharge specific capacity was 52.15 mA·h/g,and the capacity retention rate was still 71% after 100 cycles,which had good cycle stability.
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