A high-temperature rate type lithium cobalt oxide positive electrode material and preparation method thereof

Abstract

The invention discloses a high-temperature rate type lithium cobalt oxide anode material .The anode material is formed by doping lithium cobalt oxide with metallic elements M .The molecular formula of the anode material is LirCo(1-x)MxO2, wherein 1.00<=1<=1.10, 0.002<=x<=0.005, and the metallic elements M include at least one of Al, Y and Mg .The surface morphology of the lithium cobalt oxide anode material is in a highly agglomerated state that primary particles are closely fused, particle distribution is uniform, fluidity is good, the compaction performance is good, and the rate performance can be improved; the morphology is well kept in the finished lithium cobalt oxide anode material according to the characteristic that the metal elements are uniformly distributed, so that the structural stability of lithium cobalt oxide in the charging and discharging process is improved, the rate discharge performance is improved, the material can adapt to an environment at higher temperature, and therefore the lithium cobalt oxide anode material can have good rate performance in both a normal temperature environment and the high-temperature environment .The invention further provides a preparation method of the high-temperature rate type lithium cobalt oxide anode material .By means of the method, steps are simple and easy to implement, operation is convenient, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-temperature rate type lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] Lithium cobalt oxide currently has the highest market share in the cathode material market, and is widely used in 3C digital (electronic products such as mobile phones, notebook computers, mobile power supplies), electronic cigarettes, and drones. The market demand for lithium cobalt oxide is mainly high-voltage energy density type and rate type. The application of 4.4V high-voltage energy density type lithium cobalt oxide materials in lithium-ion batteries has become mature. With the increasing popularity of short-time high-current discharge electronic products such as drones used for aerial photography, not only lithium cobalt oxide is required to have excellent rate performance at room temperature, but also rate-type LiCoO...

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Problems solved by technology

[0004] Although the above technical means can achieve the effect of increasing the magnification, the crystal morphology of the synthetic material is all agglomerated particles, and the control of the tightly fused state of the morphology after the decomposition of the precursor cannot be realized, and the processing performance of the material is not good. After forming a lithium-ion battery, it is easy to cause the structure of the positive electrode material to collapse in a high temperature environment, resulting in poor rate performance

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