Modifying method of lithium nickel manganese oxide
A lithium nickel manganese oxide modification technology, which is applied in the field of lithium ion battery cathode material preparation, can solve the problems of poor capacity and rate performance of lithium nickel manganese oxide materials, increased electrode/electrolyte interface impedance, and rapid cycle performance decay. Achieve capacity and cycle performance guarantee, easy continuous industrial production, and reduce the effect of side reactions
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[0024] Example 1
[0025] A method for modifying lithium nickel manganese oxide includes the following steps:
[0026] (1) Accurately weigh lithium carbonate, nickel sulfate, and manganese sulfate according to the metering ratio of Li:Ni:Mn elements of 2:1:3, and use isopropanol for ball milling and dispersion for 5 hours. The resulting slurry is vacuum dried at 90°C , After grinding, pre-fired in 500℃ air atmosphere for 4h, natural cooling and taking out and grinding to obtain pure phase lithium nickel manganate precursor;
[0027] (2) Press Ba 5 Nb 4 O 15 : BaWO 4 :PVA=1:0.5:0.025 mass ratio weighs Ba 5 Nb 4 O 15 , BaWO 4 , PVA, mixed to form Ba 5 Nb 4 O 15 -0.5BaWO 4 -0.025PVA compound; according to the theoretical synthesis of 2% of the mass fraction of lithium nickel manganate precursor, weighing Ba 5 Nb 4 O 15 -0.5BaWO 4 -0.025PVA composite, mixed with the pure phase lithium nickel manganate precursor of step (1), using isopropanol as a dispersant, ball milling dispersion for 5...
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[0030] Example 2
[0031] A method for modifying lithium nickel manganese oxide includes the following steps:
[0032] (1) Accurately weigh lithium carbonate, nickel sulfate, and manganese sulfate according to the ratio of Li:Ni:Mn elements at 2:1:3, and use isopropanol for ball milling and dispersion for 2 hours. The resulting slurry is vacuum dried at 80°C , After grinding, pre-fired in 450℃ air atmosphere for 2h, natural cooling and taking out and grinding to obtain pure phase lithium nickel manganate precursor;
[0033] (2) Press Ba 5 Nb 4 O 15 : BaWO 4 :PVA=1: 0.1:0.01 mass ratio weighs Ba 5 Nb 4 O 15 , BaWO 4 , PVA, mixed to form Ba 5 Nb 4 O 15 -0.1BaWO 4 -0.01PVA compound; According to the theory, synthesize 0.05% of the mass fraction of lithium nickel manganate precursor, and weigh Ba 5 Nb 4 O 15 -0.1BaWO 4 -0.01 PVA composite, mixed with the pure phase lithium nickel manganate precursor of step (1), using isopropanol as a dispersant, ball milling dispersion for 2 hours, and ...
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[0036] Example 3
[0037] A method for modifying lithium nickel manganese oxide includes the following steps:
[0038] (1) Accurately weigh out lithium acetate, nickel nitrate, and manganese nitrate according to the ratio of Li:Ni:Mn elements at 2:1:3, and use absolute ethanol for ball milling and dispersion for 4 hours. The resulting slurry is vacuum dried at 90°C , After grinding, it is pre-fired in an air atmosphere at 500°C for 3 hours, cooled naturally, and then ground to obtain a pure phase lithium nickel manganese oxide precursor;
[0039] (2) Press Ba 5 Nb 4 O 15 : BaWO 4 :PVA=1: 0.2: 0.02 mass ratio weighs Ba 5 Nb 4 O 15 , BaWO 4 , PVA, mixed to form Ba 5 Nb 4 O 15 -0.2BaWO 4 -0.02PVA compound; According to the theory, synthetic 1% of the mass fraction of lithium nickel manganate precursor, and weigh Ba 5 Nb 4 O 15 -0.2BaWO 4 -0.02PVA composite, mixed with the pure phase lithium nickel manganate precursor of step (1), using alcohol as a dispersant, ball milling dispersion fo...
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