Preparation method of high-nickel ternary material used for lithium ion battery

Abstract

A preparation method of a high-nickel ternary material used for a lithium ion battery. The ternary material is Li(Ni<0.6>Co<0.2>Mn<0.2>)O<2>, of which gram volume is not less than 180 mAh / g and service life retention rate after 2000 circulations is not less than 80%. The preparation method includes following steps: (1) preparation of a precursor solution; and (2) mix-calcination. During the preparation process, because an organic solution can reduce particle aggregation, a complexing agent can control the appearance and the compatibility between a titanium dioxide enhancing material and electrolyte, the ternary material is high in the gram volume (not less than 180 mAh / g) and is good in the service life retention rate after 2000 circulations (not less than 80%). The ternary material is easy to control in appearance, is simple in process and is suitable for industrialized production.

Description

Technical field [0001] The invention relates to the field of preparation of lithium ion cathode materials, and in particular to a preparation method for preparing high nickel ternary anode materials for lithium ion batteries. Background technique [0002] Cathode material is the key component of lithium-ion batteries, and it is the most expensive part of lithium-ion batteries. Currently, the commercially available lithium battery cathode materials mainly include lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, and lithium iron phosphate. As one of the most widely used cathode materials, lithium cobalt oxide used to have a market share of more than 70%. However, cobalt is a scarce resource. Due to factors such as raw material supply, cost and price, the application of lithium cobalt oxide is facing more and more severe Challenges, development and application of high-performance alternative materials have become the consensus of the ...

AI Technical Summary

Problems solved by technology

For example, the patent (CN 103872314 A) discloses a pre-oxidation method for a high-nickel ternary cathode active material precursor for lithium-ion batteries. First, the high-nickel multi-hydroxide precursor is processed by co-precipitation and filtration, and then DC electrolysis is used to Anodic oxidation is carried out in a way to obtain the oxyhydroxide precursor Ni x m 1-x OOH, washed with pure water and dried in vacuum at 70°C to obtain pre-oxidized Ni x m 1-x OOH precursor Ni x m 1-x (OH) 2 , the final prepared ternary material Li (Ni 0.6 co 0.2 mn 0.2 )O 2 , its specific capacity is 172.2mAh / g, and its 50-cycle retention rate is 94.1%. Although its capacity has been improved, its cycle performance and its ability to absorb and retain liquid are deviated, which limits its wide application

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