Solid spherical Li[Ni0.8Co0.1Mn0.1]O2 positive electrode material precursor preparation method

Abstract

The present invention discloses a solid spherical Li[Ni0.8Co0.1Mn0.1]O2 positive electrode material precursor preparation method. According to the method, a nickel compound, a cobalt compound and a manganese compound are matched according to a stoichiometric ratio to prepare a solution having uniform components, the solution is subjected to atomization through an ultrasonic atomizer to form droplets, and the whole atomization thermal decomposition process is rapidly completed, such that component segregation of the droplets does not occur timely so as to ensure component distribution uniformity of the Li[Ni0.8Co0.1Mn0.1]O2 precursor; and regular spherical particles are formed after the droplets are dried, agglomeration is less, and the subsequent washing and grinding is not required, such that high purity of the product is ensured so as to obtain the Li[Ni0.8Co0.1Mn0.1]O2 precursor with good sphericity. The method has the following advantages that: the preparation process is simplified, the stoichiometric ratio of the components can be precisely controlled, the prepared powder has high purity, and the Li[Ni0.8Co0.1Mn0.1]O2 material with an excellent electrical performance is easily prepared after sintering.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to the positive electrode material for lithium ion secondary batteries—Li[Ni 0.8 co 0.1 mn 0.1 ]O 2 Preparation method of spherical precursor. Background technique [0002] At present, the positive electrode material used in commercial lithium-ion batteries is mainly lithium cobaltate, which has a layered structure and is easy to synthesize, but its disadvantages are: 1. The actual reversible capacity is low, generally about 140 mAh / g; 2. .The cycle life is short, about 300-500 times; 3. The safety performance is poor; 4. The cobalt raw material is a scarce strategic metal, which is expensive; 5. The cobalt element is a heavy metal, which pollutes the environment. [0003] LiNiO 2 with LiCoO 2 The properties are similar, the actual reversible capacity is higher, and the price is relatively low. However, the preparation is difficult, the structura...

AI Technical Summary

Problems solved by technology

[0002] At present, the positive electrode material used in commercial lithium-ion batteries is mainly lithium cobaltate, which has a layered structure and is easy to synthesize, but its disadvantages are: 1. The actual reversible capacity is low, generally about 140 mAh / g; 2. .Short cycle life, about 300 to 500 times; 3. Poor safety performance; 4. Cobalt raw material is a scarce strategic metal, expensive; 5. Cobalt element is a heavy metal, which pollutes the environment

However, during the charging and discharging process, the crystal structure changes repeatedly between the layered structure and the spinel structure, which causes repeated expansion and contraction of the electrode volume and reduces its cycle performance.

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