High-compaction-density ternary positive electrode material

Abstract

The invention discloses a high-compaction-density ternary positive electrode material. The material comprises the following raw materials: secondary spheres and single crystals in a weight ratio of (2-7):1. The compaction density range of the ternary positive electrode material under the pressure of 3.5T is 3.55-3.86 g / cm<3>, the true density range is 4.70-5.10 g / cm<3>, and the ratio of the compaction density to the true density under the pressure of 3.5T is 0.72-0.81. The positive electrode material has the beneficial effects that: a secondary ball and single crystal mixing process is adopted, the secondary balls and the single crystals in a proper ratio are mixed, and the single crystals effectively fill gaps among the secondary balls by utilizing the characteristic that the size of the single crystals is far smaller than that of the secondary balls, so that the compaction density of the ternary positive electrode material prepared by adopting the method can be obviously improved. Therefore, the volume energy density of a battery can be effectively improved, and meanwhile, when the positive electrode material obtained by the method is used for preparing a pole piece, the ball cracking condition of the secondary balls can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high compacted density ternary positive electrode material. Background technique [0002] As an important direction for the development of the automobile industry, new energy vehicles are currently confronted with the high price of new energy vehicles and insufficient mileage, while lithium-ion batteries have high energy density, good cycle performance, low self-discharge rate, Pollution-free, long service life and other advantages, so it is widely used in new energy vehicles, but the current lithium-ion batteries still cannot meet people's needs for mileage, increasing the volumetric energy density of lithium-ion batteries can effectively improve the performance of new energy vehicles For cruising range, ternary cathode materials are the key core materials of lithium-ion batteries, increasing the compaction density of high-nickel ternary anode materials can eff...

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Problems solved by technology

[0002] As an important direction for the development of the automobile industry, new energy vehicles are currently confronted with the high price of new energy vehicles and insufficient mileage, while lithium-ion batteries have high energy density, good cycle performance, low self-discharge rate, Pollution-free, long service life and other advantages, so it is widely used in new energy vehicles, but the current lithium-ion batteries still cannot meet people's needs for mileage, increasing the volumetric energy density of lithium-ion batteries can effectively improve the performance of new energy vehicles Endurance range, ternary cathode material is the key core material of lithium-ion batteries, increasing the compaction density of high-nickel ternary cathode materials can effectively increase the volumetric energy density of lithium-ion batteries, thereby meeting consumers' needs for mileage

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