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Positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and positive electrode technology, applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve the problems of low yield of positive electrode materials, cumbersome synthesis process, and loss of cycle capacity, so as to improve the cycle retention rate and simplify the synthesis process , the effect of reducing energy consumption

Pending Publication Date: 2020-09-04
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of positive electrode material, its preparation method and lithium ion battery, to solve the synthesis process that existing positive electrode material preparation method is loaded down with trivial details, energy consumption is big, not environmental protection, positive electrode material yield is low and will cause The problem of cycle capacity loss

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0020] As described in the background art, the existing preparation methods of positive electrode materials have the problems of cumbersome synthesis process, high energy consumption, non-environmental protection, low yield of positive electrode materials and loss of cycle capacity. In order to solve the above technical problems, the present application provides a method for preparing a positive electrode material, the preparation method comprising: performing a first sintering treatment on the lithium source material and the positive electrode precursor material (precursor material containing nickel, cobalt, manganese and aluminum), to obtain The first sintered product: coating the surface of the first sintered product with a coating agent, and then performing a second sintering treatment to obtain the positive electrode material, wherein the coating agent is a nickel source material and / or a manganese source material.

[0021] During the first sintering process, the lithium s...

Embodiment 1

[0038] (1) The precursor Ni 0.92 co 0.05 mn 0.02 Al 0.01 (OH) 2 Dry mixing with lithium source in a certain proportion, wherein the precursor and the Li element in the lithium source are mixed at a molar ratio of 1:1.05, then sintered at 850°C in an oxygen atmosphere for 10 hours, cooled, crushed and sieved with a 400-mesh sieve Sieve to obtain the first sintered similar single crystal positive electrode material.

[0039] (2) The first sintered single-crystal cathode material obtained in step (1) and the coating agent Mn(OH) 2 After the Mn element in the mixture is mixed evenly by dry method according to the mass ratio of 1:0.0008, the secondary sintering is carried out at 200°C in an oxygen atmosphere for 6 hours, cooled, crushed and sieved with a 400 mesh sieve to obtain the single crystal positive electrode material M-NCMA, SEM image See figure 1 .

Embodiment 2

[0041] (1) The precursor Ni 0.92 co 0.05 mn 0.02 Al 0.01 (OH) 2 Dry mixing with lithium source in a certain proportion, in which the precursor and the Li element in the lithium source are mixed in a certain molar ratio of 1:1.05, and then sintered at 850°C in an oxygen atmosphere for 10 hours, cooled, crushed and sieved with a 400-mesh sieve Sieve to obtain the first sintered similar single crystal positive electrode material.

[0042] (2) Combine the first-time sintered single-crystal cathode material obtained in step (1) with the coating agent Ni(OH) 2 The Ni element in the mixture was mixed uniformly by dry method according to the mass ratio of 1:0.00085, and the second sintering was carried out at 200°C in an oxygen atmosphere for 6 hours, cooled, crushed and sieved with a 400-mesh sieve to obtain the final single-crystal cathode material N-NCMA.

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Abstract

The invention provides a positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: carrying out first sintering treatment on a lithium source material and a positive electrode precursor material to obtain a first sintered product; and coating the surface of the first sintering product with a coating agent, and then carrying out second sintering treatment to obtain the positive electrode material, the coating agent being a nickel source material and / or a manganese source material. A specific coating agent is selected, a secondary sintering process (namely primary sintering, primary coating and secondary sintering) is combined to synthesize the single crystal-like positive electrode material, and the single crystal-like positive electrode material is formed by aggregating a plurality of primary particles of a single crystal-like positive electrode material with similar morphology. By adopting the preparationmethod, the synthesis process can be simplified, the energy consumption can be reduced, the yield can be improved, the washing process can be canceled, the residual lithium can be reduced, the circulating capacity is not lost, the side reaction between electrolyte and the inside of particles is reduced, the circulating retention rate is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, hybrid vehicles and energy storage systems due to their high capacity and high energy density. As one of the core components of lithium-ion batteries, cathode materials have a significant impact on the performance of lithium-ion batteries. [0003] Conventional secondary spherical positive electrode materials are prone to cracks during the rolling process of the pole piece, resulting in rapid cycle attenuation and shortening the battery life. At the same time, the direct contact between the electrolyte and the positive electrode material particles causes excessive gas production , resulting in security issues such as drum kits. Most of its synthesis process is a three-sintering process (th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525C01G45/02C01G53/00C01G53/04
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M10/0525C01G53/006C01G45/02C01G53/04H01M2004/021H01M2004/028C01P2004/03C01P2004/61Y02E60/10C01G53/42C01P2004/51C01P2004/80C01P2004/52C01P2006/40H01M4/131H01M4/1391C01G53/44C01G53/50C01P2002/10C01P2002/60
Inventor 白艳张树涛潘海龙王壮苏强
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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