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Ternary positive electrode material, preparation method and application thereof

A positive electrode material, positive electrode slurry technology, applied in positive electrodes, electrical components, battery electrodes and other directions, can solve the problems of low rate capacity, gas production, unstable cycle of ternary positive electrode materials, etc., to promote diffusion and simple preparation method , the effect of good application prospects

Pending Publication Date: 2022-02-25
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a ternary positive electrode material, its preparation method and its application. The present invention uses a one-step method to coat the ternary positive electrode material with a tungsten-containing compound and at least one effective element compound as a coating source to promote The diffusion of lithium ions solves the problems of cycle instability, low rate capacity and gas production of ternary cathode materials

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  • Ternary positive electrode material, preparation method and application thereof
  • Ternary positive electrode material, preparation method and application thereof
  • Ternary positive electrode material, preparation method and application thereof

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preparation example Construction

[0037] Among the existing technical solutions, a technical solution provides a ternary positive electrode material and a preparation method thereof and a lithium ion battery, wherein the ternary positive electrode material is mainly composed of a high-nickel ternary material and a cobalt borate coating layer; The preparation method includes: after mixing the boron source and the cobalt source, sintering in a protective atmosphere to obtain cobalt borate; mixing cobalt borate and a high-nickel ternary material, and heating in an oxidizing atmosphere to obtain the ternary positive electrode Material. The preparation conditions of the method are relatively strict, and cobalt borate needs to be prepared under a high-temperature protective atmosphere, and the ternary material should be heat-treated under an oxidative atmosphere, which is not conducive to large-scale production.

[0038] Another technical solution provides a method for selectively coating the surface of high-nickel ...

Embodiment 1

[0041] This embodiment provides a method for preparing a positive electrode sheet, the method comprising the following steps:

[0042] (1) LiNi 0.6 co 0.1 mn 0.3 o 2 Add Al when first heating up to 350°C at a heating rate of 3.5°C / min 2 o 3 , and then heated up to 650°C for the second time at a heating rate of 4.5°C / min and added H 2 W 2 o 7 , to obtain a ternary cathode material, the LiNi 0.6 co 0.1 mn 0.3 o 2 It is a secondary ball, the D50 particle size is 11μm, the Al 2 o 3 、H 2 W 2 o 7 and LiNi 0.6 co 0.1 mn 0.3 o 2 The mass ratio is 0.1:0.3:99.6;

[0043] (2) The mass ratio of ternary positive electrode material, conductive carbon black, conductive carbon tube, polyvinylidene fluoride and nitrogen methyl pyrrolidone is 97.5:1:0.5:1:40, and conductive carbon black, conductive carbon tube, polyvinylidene fluoride After mixing vinyl fluoride and nitrogen methyl pyrrolidone, stirring at 500 rpm for 2 hours to obtain a conductive slurry, mixing the obtain...

Embodiment 2

[0046] This embodiment provides a method for preparing a positive electrode sheet, the method comprising the following steps:

[0047] (1) LiNi 0.5 co 0.3 mn 0.2 o 2 Add Al when the temperature rises to 200°C at a heating rate of 2°C / min 2 o 3 , and then heated up to 500°C for the second time at a heating rate of 3°C / min and added H 2 W 2 o 7 , to obtain a ternary cathode material, the LiNi 0.5 co 0.3 mn 0.2 o 2 For the secondary ball, the D50 particle size is 2μm, the Al 2 o 3 、H 2 W 2 o 7 and LiNi 0.6 co 0.1 mn 0.3 o 2 The mass ratio is 0.1:0.1:99.98;

[0048] (2) The mass ratio of conductive carbon black, polyvinylidene fluoride and nitrogen methyl pyrrolidone is 90:0.5:0.5:20 for ternary positive electrode material, after mixing conductive carbon black, polyvinylidene fluoride and nitrogen methyl pyrrolidone Stirring at 500 rpm for 2 hours to obtain a conductive slurry, mixing the obtained conductive slurry with a ternary positive electrode material an...

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Abstract

The invention provides a ternary positive electrode material and a preparation method and application thereof. The ternary positive electrode material comprises a coating layer arranged on the surface, and the coating layer comprises a tungsten-containing compound and a co-coating layer of at least one effective element compound; the effective elements comprise any one or a combination of at least two of B, Mg, Al, Si, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Nb, Mo, Ru, Sn, Sb, Ba, Hf, Ta, Re or Bi. The ternary positive electrode material is coated by taking the tungsten-containing compound and the at least one effective element compound as the coating source, so that the side reaction between the ternary positive electrode material and electrolyte is reduced, the diffusion of lithium ions is promoted, the power performance and the cycle performance of the material are improved, and the gas production problem is effectively improved; according to the preparation method, the surface of the ternary positive electrode material is coated through one-time sintering treatment, the preparation method is simple, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a ternary positive electrode material, a preparation method and an application thereof. Background technique [0002] With the rapid development of 3C electronic products, new energy vehicles and wearable electronic products, the development of lithium-ion batteries has received extensive attention. The ternary layered material LiNi x co y mn 1-x-y o 2 (Referred to as ternary materials) has become one of the research hotspots of researchers. Ternary materials have the advantages of high theoretical specific capacity of 274mAh / g, high reaction platform voltage of 3.0-4.4V and low cost. However, the currently widely used ternary materials are prone to side reactions with the electrolyte in the battery, causing the electrolyte to decompose and produce gas. It is also necessary to improve the power performance and cycle performance to further improve the battery p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/50H01M4/505H01M4/52H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/58H01M4/5825H01M4/502H01M4/505H01M4/523H01M4/525H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 朱呈岭杨元婴李岚莫方杰杨文龙孙化雨
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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