LiFePO4 lithium ion battery anode material coated with C and metal oxide and preparation method
A lithium-ion battery, cathode material technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of poor high-rate performance and limited improvement, reduce corrosion, improve cycle characteristics, and improve high-rate electrochemical performance. Effect
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Embodiment 1
[0023] Preparation of LiFePO by the above-mentioned sol-gel method 4 / C positive electrode material dry gel, using a secondary synthesis process (8 hours of heat preservation) to obtain LiFePO with a carbon content of 9.5% 4 / C matrix material, LSM was prepared by sol-gel spontaneous combustion method. Disperse 0.98 grams of matrix material in 48 milliliters of ethanol (concentration 2.5%), stir at room temperature for 4 hours, disperse 0.02 grams of LSM in 12.5 milliliters of ethanol (concentration 0.2%), add the LSM suspension drop by drop to LiFePO 4 / C, stirred at 60°C, evaporated the alcohol until it became a paste, and then dried it in an oven, in a reducing atmosphere (nitrogen-hydrogen mixed gas V 氮气 :V 氢气 =95:5) was heat treated at 400°C for 4 hours, ground, and sieved to obtain 2% LSM coated LiFePO 4 / C material, its electrochemical performance is good. The battery is charged and discharged at a rate of 0.1 for 10 cycles, then charged and discharged at a rate of ...
Embodiment 2
[0025] Take commercially available LiFePO prepared by solid-phase method 4 / C (C content 10%) cathode material, LSM prepared by sol-gel spontaneous combustion method. Take 0.995 grams of matrix material and disperse it in 60 milliliters of ethanol (concentration 2%), stir at room temperature for 4 hours, disperse 0.005 grams of LSM in 12.5 milliliters of ethanol (concentration 0.5%), add the LSM suspension drop by drop to LiFePO 4 / C, stirred at 60°C, evaporated the alcohol until it became a paste, and then dried it in an oven, in a reducing atmosphere (nitrogen-hydrogen mixed gas V 氮气 :V 氢气 =80:20) heat treated at 400°C for 4 hours, ground and sieved to obtain 0.5% LSM coated LiFePO 4 / C material, its electrochemical performance is good. The battery was charged and discharged at a rate of 0.1 for 15 cycles, and then charged and discharged at a rate of 0.2 for 10 cycles, charged at a rate of 0.2 and discharged at a rate of 0.5 for 10 cycles.
Embodiment 3
[0027] Preparation of LiFePO by the above-mentioned sol-gel method 4 / C positive electrode material dry gel, using a synthesis process (10 hours of heat preservation) to obtain LiFePO with a carbon content of 2% 4 / C matrix material, LSM was prepared by solid phase method. Take 0.95 grams of matrix material and disperse it in 22.5 milliliters of ethanol (concentration 5%), stir at room temperature for 4 hours, disperse 0.05 grams of LSM in 6.2 milliliters of ethanol (concentration 1%), add the LSM suspension drop by drop to LiFePO 4 / C, stirred at 60°C, evaporated the alcohol until it became a paste, and then dried it in an oven, in a reducing atmosphere (nitrogen-hydrogen mixed gas V 氮气 :V 氢气 =50:50) heat treated at 400°C for 4 hours, ground and sieved to obtain 5% LSM coated LiFePO 4 / C material, its electrochemical performance is good. The battery was charged and discharged at a rate of 0.1 for 15 cycles, and then charged and discharged at a rate of 0.2 for 10 cycles, c...
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