A high-voltage lithium battery positive electrode material doped with a trace amount of tungsten and its preparation method
A high-voltage lithium battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low electronic conductivity of lithium ferrous phosphate, difficult to meet high current charging and discharging, and poor cobalt price, etc. The effect of improving discharge cycle performance, improving cycle stability, and uniform voltage change
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Embodiment 1
[0030] Preparation of LiNi 0.5 mn 1.4985 W 0.001 o 4 . Weigh 0.105mol lithium acetate, 0.05mol nickel acetate, 0.14985mol manganese acetate, 0.0001mol tungsten hexachloride and 0.315mol ammonium oxalate in 500ml deionized water, temperature control Constantly heating and stirring at 60°C, finally a viscous wet gel is obtained, put the wet gel in a vacuum drying oven, and dry it in vacuum at 90°C to obtain a grass-green xerogel, and then quickly transfer the xerogel to the muffle In the furnace, pre-sinter at 400°C for 6 hours to obtain a pre-sintered product, cool to room temperature and then grind, then perform secondary sintering at 700°C for 10 hours, cool to room temperature, and grind, and finally get doped with trace tungsten elements High voltage lithium battery cathode material LiNi 0.5 mn 1.4985 W 0.001 o 4 . The prepared material was assembled into a button battery, tested at a constant current charge and discharge rate of 140mAh / g, the initial capacity was ...
Embodiment 2
[0032] Preparation of LiNi 0.5 mn 1.4925 W 0.005 o 4 . Weigh 0.105mol of lithium acetate, 0.05mol of nickel acetate, 0.14925mol of manganese acetate, 0.0005mol of tungsten hexachloride and 0.315mol of ammonium oxalate in 500ml of deionized water, temperature controlled Constantly heating and stirring at 50°C to obtain a wet gel at last, place the wet gel in a vacuum drying oven, and dry it under vacuum at 100°C to obtain a grass-green xerogel, then quickly transfer the xerogel to a muffle furnace, Pre-sintered at 500°C for 5 hours to obtain a pre-sintered product, cooled to room temperature and then ground, and then carried out secondary sintering at 900°C for 8 hours, cooled to room temperature, ground, and finally obtained a high-voltage lithium battery doped with trace tungsten elements Cathode material LiNi 0.5 mn 1.4925 W 0.005 o 4 . The prepared material was assembled into a button battery, tested at a constant current charge and discharge rate of 140mAh / g, the ...
Embodiment 3
[0034] Preparation of LiNi 0.5 mn 1.4865 W 0.009 o 4 . Weigh 0.105mol of lithium acetate, 0.05mol of nickel acetate, 0.14865mol of manganese acetate, 0.0009mol of tungsten hexachloride and 0.315mol of ammonium oxalate in a molar ratio of 1.05:0.5:1.4865:0.009:3 and dissolve them in 500ml of deionized water. Constantly heating and stirring at 80°C to obtain a wet gel at last, place the wet gel in a vacuum drying oven, and dry it under vacuum at 80°C to obtain a grass-green xerogel, then quickly transfer the xerogel to a muffle furnace, Pre-sintered at 600°C for 4 hours to obtain a pre-sintered product, cooled to room temperature and then ground, then carried out secondary sintering at 1000°C for 6 hours, cooled to room temperature, and ground, and finally obtained a high-voltage lithium battery doped with trace tungsten elements Cathode material LiNi 0.5 mn 1.4865 W 0.009 o 4. The prepared material was assembled into a button battery, tested at a constant current charg...
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