Applications of boron-doped lithium vanadium phosphate positive electrode material in lithium ion battery
A lithium-ion battery and lithium vanadium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low conductivity, poor high-current discharge performance, and poor high-voltage cycle stability, and achieve simple modification methods , the effect is obvious, and the effect is easy to operate
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[0018] Example 1
[0019] Dissolve 0.003mol of oxalic acid in a beaker filled with deionized water, then add 0.001mol of vanadium pentoxide, stir in a constant temperature water bath at 70-80℃ until a blue solution, and then add 0.00299mol of ammonium dihydrogen phosphate , 0.00001mol of boric acid, 0.0015mol of lithium carbonate, continue to stir to form a blue-green doped lithium vanadium phosphate sol (Li:V:B:PO 4 3- = 3:2:0.01:2.99). The sol was placed in an oven at 80°C for about 10 hours to obtain a blue fluffy precursor. The precursor was ground into powder and placed in a tube furnace. Under an argon atmosphere, the temperature was raised to a temperature of 3°C / min. The temperature was kept at 350°C for 4 hours, and the temperature was lowered and then taken out for grinding. The temperature was increased to 750°C at a temperature increase rate of 3°C / min and kept for 10 hours to obtain lithium vanadium phosphate composite powder doped with 1% boron.
Example Embodiment
[0020] Example 2
[0021] Dissolve 0.003mol of oxalic acid in a beaker filled with deionized water, then add 0.001mol of vanadium pentoxide, stir in a constant temperature water bath at 70-80℃ until a blue solution, and then add 0.00297mol of ammonium dihydrogen phosphate , 0.00003mol of boric acid, 0.0015mol of lithium carbonate, continue to stir to form a blue-green doped lithium vanadium phosphate sol (Li:V:B:PO 4 3- = 3:2:0.03:2.97). Place the sol in an oven at 80°C for about 10 hours to obtain a blue fluffy precursor. The precursor is ground into powder and placed in a tube furnace. Under an argon atmosphere, the temperature is raised at a rate of 3°C / min. The temperature is raised to 350° C. and kept for 4 hours. After the temperature is lowered, it is taken out and ground. The temperature is increased to 750° C. at a heating rate of 3° C. / min and kept for 10 hours to obtain a lithium vanadium phosphate doped with 3% boron.
Example Embodiment
[0022] Example 3
[0023] Dissolve 0.003mol of oxalic acid in a beaker filled with deionized water, then add 0.001mol of vanadium pentoxide, stir in a constant temperature water bath at 70-80℃ until a blue solution, and then add 0.00295mol of ammonium dihydrogen phosphate , 0.00005mol of boric acid, 0.0015mol of lithium carbonate, continue to stir to form a blue-green doped lithium vanadium phosphate sol (Li:V:B:PO 4 3- = 3:2:0.05:2.95). Place the sol in an oven at 80°C for about 10 hours to obtain a blue fluffy precursor. The precursor is ground into powder and placed in a tube furnace. Under an argon atmosphere, the temperature is raised at a rate of 3°C / min. The temperature is raised to 350° C. and kept for 4 hours. After the temperature is lowered, it is taken out and ground, and the temperature is increased to 750° C. at a heating rate of 3° C. / min and the temperature is kept for 10 hours until the lithium vanadium phosphate composite powder doped with 5% boron.
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