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Lithium ion battery positive electrode material and preparation method and application thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as incompatibility and difficulty in optimizing the performance of ternary materials, and achieve simple preparation methods, improved electrical conductivity and chemical stability. Sexuality, the effect of reducing side effects

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

AI Technical Summary

Problems solved by technology

However, the sintering temperature required by different substances in coating is often quite different, which is difficult to be compatible, making it difficult to optimize the performance of ternary materials

Method used

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  • Lithium ion battery positive electrode material and preparation method and application thereof
  • Lithium ion battery positive electrode material and preparation method and application thereof
  • Lithium ion battery positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0042] (1) Al 2 W 3 o 12 and LiNi 0.64 co 0.09 mn 0.27 o 2 After mixing, it is sintered at 525°C for 20 hours at one time to obtain the positive electrode material of lithium ion battery. The LiNi 0.64 co 0.09 mn 0.27 o 2 It is a secondary ball, the D50 particle size is 11μm, the Al 2 W 3 o 12 and LiNi 0.64 co 0.09 mn 0.27 o 2 The mass ratio is 0.4:99.6;

[0043] (2) Lithium-ion battery positive electrode material, conductive carbon black, conductive carbon tube, polyvinylidene fluoride and nitrogen methyl pyrrolidone mass ratio is 97.5:1:0.5:1:40, conductive carbon black, conductive carbon tube, poly Stirring the vinylidene fluoride and nitrogen methyl pyrrolidone at 500 rpm for 2 hours to obtain a conductive slurry, mixing the obtained conductive slurry with the positive electrode material of the lithium ion battery and stirring at ...

Embodiment 2

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

[0047] (1) Al 2 W 3 o 12 and LiNi 0.5 co 0.3 mn 0.2 o 2 After mixing, it is sintered at 300°C for 40 hours at one time to obtain the positive electrode material of lithium ion battery. 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 W 3 o 12 and LiNi 0.5 co 0.3 mn 0.2 o 2 The mass ratio is 0.01:99.99;

[0048] (2) Lithium-ion battery cathode material, the mass ratio of conductive carbon black, polyvinylidene fluoride and nitrogen methyl pyrrolidone is 90:0.5:0.5:20, after mixing conductive carbon black, polyvinylidene fluoride and nitrogen methyl pyrrolidone Stirring at 500rpm for 2h to obtain a conductive slurry, mixing the obtained conductive slurry with the lithium-ion battery positive electrode material and stirring at 500rpm for 2h to obtain a positive electrode slurry;

[0049] (3) ...

Embodiment 3

[0051] This embodiment provides a method for preparing a positive electrode sheet of a lithium ion battery, the method comprising the following steps:

[0052] (1) Al 2 W 3 o 12 and LiNi 0.8 co 0.1 mn 0.1 o 2 After mixing, sinter at 750°C for 2 hours at one time to obtain the positive electrode material of lithium ion battery. The LiNi 0.8 co 0.1 mn 0.1 o 2 For secondary balls, the D50 particle size is 20μm, the Al 2 W 3 o 12 and LiNi 0.8 co 0.1 mn 0.1 o 2 The mass ratio is 4:96;

[0053] (2) Lithium-ion battery positive electrode material, conductive carbon black, conductive carbon tube, polyvinylidene fluoride and nitrogen methyl pyrrolidone mass ratio is 99:2:1.5:1.5:40, the conductive carbon black, conductive carbon tube, poly After mixing vinylidene fluoride and nitrogen methyl pyrrolidone, stir at 500 rpm for 2 hours to obtain a conductive slurry, mix the obtained conductive slurry with the lithium-ion battery positive electrode material and stir at 500 ...

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Abstract

The invention provides a lithium ion battery positive electrode material and a preparation method and application thereof. The lithium ion battery positive electrode material is a ternary material with the surface coated with a coating layer, and the coating layer comprises a co-coating layer containing tungsten and at least one effective element compound; the effective elements comprise any one or a combination of at least two of Al, Mg, Zr, Ba, Mn, Rb, Co, Si, Ni, Sr, Ce or Bi. The ternary material is coated by taking the compound containing tungsten and at least one effective element as a coating source, so that the conductivity and chemical stability of the ternary material can be improved, the side reaction between the ternary material and an electrolyte is reduced, the gas production problem can be effectively improved, and the power performance of the material can be improved; co-coating of the ternary material can be achieved through one-time sintering treatment, the preparation method is simple, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material, a preparation method and application thereof. Background technique [0002] Ternary layered material LiNi x co y mn 1-x-y o 2 (Referred to as ternary material) is widely used in 3C electronic products, electric bicycles, electric vehicles and new energy due to its high theoretical specific capacity, high reaction platform voltage and good thermal stability. With the rapid development of the new energy industry, higher requirements are placed on lithium-ion batteries, and ternary materials need to be modified to improve their power performance and cycle performance while taking into account their safety. At present, the above problems are mainly solved by coating different substances on the surface of ternary materials. [0003] The coating method generally uses one or several inert substances or conductive substances to...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/505H01M4/52H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/502H01M4/505H01M4/523H01M4/525H01M4/624H01M10/0525H01M2004/028Y02E60/10
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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