Lithium ion battery anode material and lithium ion battery adopting the lithium ion battery anode material
A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of large gas production, poor application performance, and high expansion rate
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[0036] The present invention will be described in detail below based on specific test results.
[0037] The nickel-containing precursor and lithium carbonate were mixed and sintered at 850°C for 24 hours in an air atmosphere, and then pulverized with a mortar to make an active material for positive electrodes.
[0038] Copper foil is used as the current collector of the negative electrode, aluminum foil is used as the current collector of the positive electrode, the sintered lithium cobaltate is used as the positive electrode active material, and MCMB is used as the negative electrode active material. The battery model is square 633770. Lithium cobaltate was mixed with 5% binder PVDF and 4% conductive carbon black, and added to N-methylpyrrolidone at a ratio of 1:1. The negative electrode material can be directly mixed with 10% binder PVDF and added in a ratio of 1:1 to make a slurry. The reconciled positive electrode slurry is coated on the positive electrode current collec...
Embodiment 1
[0044] A plurality of lithium-ion batteries of 633770 squares are made according to the above method, and the median diameter of the battery active material is greater than 6 microns, and the single particle in the primary particle forming secondary spherical particles is analyzed from the electron microscope image The proportion of the total individual particles whose size is above 1 micron is greater than 18%. The battery expansion rate of the fabricated battery is 7.8% under the high temperature storage condition of 85 degrees for 4 hours.
[0045] A plurality of lithium-ion batteries of 633770 square shape are manufactured according to the above-mentioned method, and the content of cobalt and nickel content of the battery active material used are 40% and 13%. The pH value of the positive electrode material used is 11.3. The battery expansion rate of the fabricated battery is 19.8% under the high temperature storage condition of 85 degrees for 4 hours.
Embodiment 2
[0047] A plurality of lithium-ion batteries of 633770 squares are made according to the above method, and the battery active material used is LiNi 0.4 co 0.2 mn 0.4 o 2 The median diameter of its particle size is greater than 6 microns, and the proportion of single particles with a size of more than 1 micron in the primary particles forming secondary spherical particles is greater than 18% in the total single particles. The battery expansion rate of the fabricated battery is 6.7% under the high temperature storage condition of 85 degrees for 4 hours.
[0048] The above experimental results show that, for lithium-ion battery positive electrode materials containing more than 23% nickel content, the particle morphology is secondary spherical large particles of positive electrode materials formed by primary small particles when forming secondary particles When the proportion of particles smaller than 1 micron in the primary particles is greater than 15% of the total primary par...
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