Precursor of lithium ion battery cathode material, preparation method thereof, cathode active material, lithium ion battery, and continuous reactor

Abstract

The invention relates to a precursor of a lithium ion battery cathode material, a preparation method thereof, a cathode active material of a lithium ion battery, a lithium ion battery, and a continuous reactor, and belongs to the technical field of new energy materials. The preparation method of the precursor comprises following steps: mixing nickel salt, cobalt salt, manganese salt, doped metal salt (D salt), a precipitating agent, and a complexing agent to obtain a reaction system; carrying out reactions under stirring at a temperature of 30-80 DEG C in an inert gas atmosphere, wherein the pH is 10.0-13.0 during the reaction process, raw materials are fed into the system continuously, and reaction products are discharged continuously through overflowing; and aging the overflowed materials for 1 to 5 hours to obtain the precursor. When the granularity of overflowed materials reaches a set value, the reaction system is subjected to an ultrasonic treatment until the granularity of overflowed materials is lower than the set value. The obtained precursor has the advantages of uniform granularity and morphology, and large tap density, and is benefit for the preparation of a lithium ionbattery cathode material with excellent electrochemical properties.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material precursor and a preparation method thereof, a lithium ion battery cathode active material, a lithium ion battery, and a continuous reactor, and belongs to the technical field of new energy materials. Background technique [0002] At present, LiCoO is mainly used as the cathode material of commercial lithium-ion batteries. 2 , LiMn 2 o 4 、LiFePO 4 , Li(Ni x co y mn z )O 2 [x+y+z=1.0, referred to as NCM], Li(Ni 0.8 co 0.15 al 0.05 )O 2 [abbreviated as NCA], etc., but the relatively poor cobalt element leads to LiCoO 2 The cost is higher, while LiMn 2 o 4 、LiFePO 4 Lower specific capacity. In contrast, NCM / NCA is widely used due to its advantages of low cost, high capacity, and good security. As the core raw material of the cathode material, the physical and chemical properties of the precursor directly determine the physical, chemical and electrochemical performance of the ca...

AI Technical Summary

Problems solved by technology

This synthesis method will cause periodic particle size fluctuations in the precursor synthesis process. At the same time, periodic pH fluctuations will also affect the instability of the particle growth rate and nucleation rate, resulting in disordered growth of particles and decreased orientation. Affect the electrochemical performance of the material

[0004] The Chinese invention patent with the authorized publication number CN 103943846B discloses a preparation method of a cathode material precursor for a lithium-ion battery, and obtains a titanium dioxide-coated Ni x co y mn z A 1-x-y-z (OH) 2 In the preparation process of the positive electrode material precursor, the particle size of the material was not regulated, and the particle size fluctuated too much, which in turn affected the electrochemical performance of the material.

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