Multi-level cooperative modified lithium battery positive electrode material and preparation method thereof
A cathode material, synergistic modification technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of loss of protective effect, neglect and deterioration of the coating layer, achieve excellent cycle characteristics and storage characteristics, and improve cycling and storage. Equal performance and the effect of reducing side reactions
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[0027] Example 1
[0028] In the first step, the mixed aqueous solution of manganese sulfate, nickel sulfate, and cobalt sulfate and the aqueous solution of magnesium sulfate are fed into the mixture in a stirring state according to the molar ratio Mn:Ni:Co:Mg=0.295:0.500:0.200:0.005 In the continuous reactor, a constant amount of sodium hydroxide solution and ammonia water are passed under the protection of nitrogen at the same time, and the reaction temperature is maintained at 50° C., and continuous overflow to obtain precipitation. The obtained precipitate is washed, filtered and dried to obtain the hydroxide precursor Mn 0.295 Ni 0.500 Co 0.200 Mg 0.005 (OH) 2 .
[0029] In the second step, the above-mentioned precursor is mixed with lithium carbonate and molybdenum oxide at a molar ratio of 1:1.05:0.005, sintered at 950°C for 20 hours in an air atmosphere, cooled naturally, crushed, and sieved to obtain a composition of Li 1.05 Mn 0.295 Ni 0.500 Co 0.200 Mg 0.005 Mo 0.005 O 2...
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[0031] Example 2
[0032] Except for controlling the molar ratio of the precursor to lithium carbonate and molybdenum oxide=1:1.05:0.002 in the second step, the positive electrode active material was obtained in the same manner as in Example 1 above.
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[0033] Example 3
[0034] Except for controlling the molar ratio of Al to the positive electrode material in the third step to 0.01, the positive electrode active material was obtained in the same manner as in Example 1 above.
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