High-nickel multi-element positive electrode material as well as preparation method and application thereof

A cathode material and multiple technologies, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of material surface degradation, long sintering cycle, high pH value, improve structural stability, reduce synthesis costs, and improve product performance. Effect

Active Publication Date: 2022-01-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0002] High-nickel ternary cathode materials are conducive to improving the energy density of batteries, but as the nickel content increases, material circulation and thermal stability also decrease, which in turn affects the cycle life and safety of batteries. In order to enhance the performance of high-nickel ternary cathode materials Workability, usually with elemental doping and surface coating of the material
[0003] However, the existing doping and surface coating process is complex, the sintering cycle is long, the product consistency and stability are poor, and after the high-nickel ternary material is left in humid air, the surface of the material will degrade, which seriously affects the performance of the material.
In the synthesis process of the traditional process, the preparation of the precursor is separated from the sintering of the finished product. During the sintering process, the lithium salt is inevitably excessive, and the excess lithium salt is in a high-temperature environment. H 2 O and CO 2 The reaction again produces LiOH and Li 2 CO 3 , remains on the surface of the ternary material, making the pH value of the material relatively high; and the high-nickel ternary material produced by the traumatic process is also prone to high-temperature gas production

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  • High-nickel multi-element positive electrode material as well as preparation method and application thereof

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[0027] The first aspect of the present invention provides a method for preparing a high-nickel multi-element positive electrode material, comprising the following steps:

[0028] A precursor solution is provided, the precursor solution is a mixed salt solution of nickel salt, cobalt salt, and manganese salt and a metal dopant is added therein;

[0029] Transporting the precursor liquid to high-temperature reaction equipment under high pressure, and under the protection of a protective atmosphere, the precursor liquid is condensed to obtain precursor particles;

[0030] Spraying lithium source powder into the high temperature reaction equipment, the lithium source powder is in contact with the precursor particles, crystallized to obtain aggregated secondary particles;

[0031] The secondary particle is mixed with the surface coating additive and sintered to prepare a high-nickel multi-element positive electrode material.

[0032] On the basis of the traditional ternary composi...

Embodiment 1

[0045]According to the ratio of the amount n of metal elements to 0.907:0.045:0.044:0.003:0.001, nickel acetate, cobalt acetate, manganese acetate, aluminum oxide and magnesium oxide are mixed and dissolved in water, and ammonia solution is added to adjust the pH to 10-11 , stirred for 1h to obtain a precursor solution;

[0046] The precursor liquid is transported to a high-temperature reaction tower with a temperature of 650°C through a pressure of 1 MPa. Under the protection of nitrogen, the precursor liquid is condensed to obtain precursor particles, which are mixed with lithium hydroxide powder sprayed in the middle of the reaction tower, and the flow rate is controlled until the precursor particles and The mass ratio of lithium hydroxide powder is 1:1.05, and secondary particles are obtained at the bottom of the tower;

[0047] Combine the secondary particles with LiCoO 2 According to the mass ratio of 1:0.04 mixed, sintered at 600 ° C for 2 hours to obtain high-nickel m...

Embodiment 2

[0059] According to the ratio of the amount n of the metal element substance to 0.841:0.081:0.073:0.002:0.003, nickel acetate, cobalt acetate, manganese acetate, zirconium oxide and magnesium oxide are mixed and dissolved in water, and ammonia solution is added to adjust the pH value to 10 ~11, stir for 0.5h to obtain the precursor solution;

[0060] The precursor liquid is transported to a high-temperature reaction tower with a temperature of 550°C through a pressure of 2 MPa. Under the protection of nitrogen, the precursor liquid is condensed to obtain precursor particles, which are mixed with lithium hydroxide powder sprayed in the middle of the reaction tower, and the flow rate is controlled until the precursor particles and The mass ratio of lithium hydroxide powder is 1:1.1, and secondary particles are obtained at the bottom of the tower;

[0061] Al 2 o 3 Mix according to the mass ratio of 1:0.03, and sinter at 650°C for 2.5h to prepare LiNi, a high-nickel multi-eleme...

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Abstract

The invention discloses a high-nickel multi-element positive electrode material as well as a preparation method and application thereof. The preparation method comprises the steps that: a nickel-cobalt-manganese precursor solution added with a metal dopant is obtained, and the precursor solution is condensed to obtain precursor particles; the precursor particles are in contact with sprayed lithium source powder, aggregated secondary particles are obtained through crystallization, and the secondary particles and a surface coating additive are mixed, and the mixture is sintered, and the high-nickel multi-element positive electrode material is prepared. According to the preparation method, the synthesis of the precursor and the sintering of the secondary particles are completed in the same equipment, so that the cost is reduced, the influence of external environment on the surface property of the high-nickel material is avoided, the obtained high-nickel multi-element positive electrode material has excellent cycle performance and good structural stability, and the problem of high-temperature gas production is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a preparation method of a high-nickel multi-element positive electrode material, further relates to a high-nickel multi-element positive electrode material prepared by the preparation method, and also relates to the use of the high-nickel multi-element positive electrode material in a lithium-ion battery Applications. Background technique [0002] High-nickel ternary cathode materials are conducive to improving the energy density of batteries, but as the nickel content increases, material circulation and thermal stability also decrease, which in turn affects the cycle life and safety of batteries. In order to enhance the performance of high-nickel ternary cathode materials Workability, usually elemental doping and surface coating of the material. [0003] However, the existing doping and surface coating process is complicated, the sintering cycle is long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/525H01M4/505Y02E60/10
Inventor 吴小兰宋建冬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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