Surface coated lithium ion battery cathode material, and preparation method thereof
A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of non-conductivity of metal compounds, poor conductivity of positive electrode materials, and reduced electrochemical performance of batteries, etc. The effect of cycle performance and stability, sufficient raw material resources, and good industrial application prospects
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[0032] Please refer to figure 1 , the present invention also provides a method for preparing a surface-coated lithium-ion battery positive electrode material, comprising:
[0033] S1, adding rare metal-doped strontium titanate nanopowder into a volatile solvent for high-speed stirring and ultrasonic dispersion to form a mixed solution;
[0034] S2, adding the positive active material into the mixed solution under high-speed stirring, so that the mixed solution is evenly coated on the surface of the positive active material to obtain a mixture;
[0035] S3, the mixture is dried, calcined, cooled, pulverized and sieved to obtain the surface-coated lithium-ion battery cathode material.
[0036] In step S1, the rare metal-doped strontium titanate nanopowder can be obtained by wet mixing rare metal oxides and strontium titanate, mixing uniformly, drying, sintering and grinding. The sintering temperature is 1000-1300° C., and the sintering atmosphere is inert gas, such as nitrogen...
Embodiment 1
[0040]La 2 o 3 and SrTiO 3 Press Sr 0.998 La 0.002 TiO 3 The stoichiometric ratio ingredients are wet-mixed, mixed evenly and then dried. After sintering and grinding, the lanthanum-doped strontium titanate nano-powder is obtained; the lanthanum-doped strontium titanate nano-powder is added to anhydrous High-speed stirring in ethanol for 30 minutes, followed by ultrasonication for 10 minutes, followed by high-speed stirring and ultrasonic circulation for 3 to 5 times, mixing evenly to form a uniform solution; the positive electrode active material LiNi 0.8 co 0.15 al 0.05 o 2 Add it into the above mixed solution under the condition of high-speed stirring, so that the coating material is uniformly coated on the active material LiNi 0.8 co 0.15 al 0.05 o 2 surface, and then directly dried to obtain a mixture, which was dried for 6 hours, and the dried solid material was calcined at 500° C. for 10 hours, cooled, pulverized, and sieved.
[0041] Please refer to Figur...
Embodiment 2
[0043] Will Nb 2 o 5 and SrTiO 3 Press SrTi 0.997 Nb 0.003 o 3 The stoichiometric ratio ingredients are wet-mixed, mixed evenly and then dried. After sintering and grinding, the niobium-doped strontium titanate nano-powder is obtained; the niobium-doped strontium titanate nano-powder is added to the deionized High-speed stirring in water for 30 minutes, then ultrasonic for 10 minutes, followed by high-speed stirring and ultrasonic circulation for 3 to 5 times, mixing evenly to form a uniform mixed solution; the active material LiNi 0.5 co 0.2 mn 0.3 o 2 Add it into the above mixed solution under the condition of high-speed stirring, so that the coating material is uniformly coated on the active material LiNi 0.5 co 0.2 mn 0.3 o 2 surface, after direct drying, the mixture was dried for 8 hours, and the dried solid material was calcined at 600° C. for 8 hours, then cooled, pulverized, and sieved to obtain the positive electrode material.
[0044] Experiments have pro...
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