Positive pole piece of lithium ion battery and preparation method and application thereof

A technology for lithium-ion batteries and positive pole pieces, applied in battery electrodes, positive electrodes, secondary batteries, etc., to achieve the effects of improving conductivity, optimizing power performance, and improving gas production problems

Pending Publication Date: 2022-01-11
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 currently widely used ternary materials are prone to side reactions with the electrolyte in batteries, causing the electrolyte to decompose and produce gas; in addition, ternary materials also have the need to improve power performance

Method used

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  • Positive pole piece of lithium ion battery and preparation method and application thereof
  • Positive pole piece of lithium ion battery and preparation method and application thereof
  • Positive pole piece of lithium ion battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a lithium-ion battery positive pole piece, the lithium-ion battery positive pole piece includes a coated modified ternary material, and the preparation method of the coated modified ternary material is as follows:

[0044] Mix CoAl at a mass ratio of 0.3:99.7 2 o 4 LiNi with single crystal morphology 0.65 co 0.07 mn 0.28 o 2 A mixture of ternary materials is obtained, and the mixture is sintered at 600° C. for 20 hours to obtain the coated modified ternary material;

[0045] The CoAl 2 o 4 Particle size D 50 0.2 μm, the single crystal morphology of LiNi 0.65 co 0.07 mn 0.28 o 2 Particle size D of ternary material 50 5 μm;

[0046] The preparation method of the positive electrode sheet of the lithium ion battery comprises the following steps:

[0047] Mix conductive carbon black, conductive carbon nanotubes, nitrogen methyl pyrrolidone and polyvinylidene fluoride to obtain a conductive slurry, add the coated modified ternary materia...

Embodiment 2

[0050] This embodiment provides a lithium-ion battery positive pole piece, the lithium-ion battery positive pole piece includes a coated modified ternary material, and the preparation method of the coated modified ternary material is as follows:

[0051] Mix CoAl at a mass ratio of 1:99 2 o 4 LiNi with single crystal morphology 0.8 co 0.03 mn 0.17 o 2 A mixture of ternary materials is obtained, and the mixture is sintered at 450° C. for 30 hours to obtain the coated modified ternary material;

[0052] The CoAl 2 o 4 Particle size D 50 1.0 μm, the single crystal morphology of LiNi 0.8 co 0.03 mn 0.17 o 2 Particle size D of ternary material 50 8μm;

[0053] The preparation method of the positive electrode sheet of the lithium ion battery comprises the following steps:

[0054] Mix conductive carbon black, conductive carbon nanotubes, ethylene carbonate and polytetrafluoroethylene to obtain a conductive slurry, add the coated modified ternary material to the conduct...

Embodiment 3

[0056] This embodiment provides a lithium-ion battery positive pole piece, the lithium-ion battery positive pole piece includes a coated modified ternary material, and the preparation method of the coated modified ternary material is as follows:

[0057] Mix CoAl at a mass ratio of 2:98 2 o 4 LiNi with single crystal morphology 0.6 co 0.12 mn 0.28 o 2 A mixture of ternary materials is obtained, and the mixture is sintered at 800° C. for 10 hours to obtain the coated modified ternary material;

[0058] The CoAl 2 o 4 Particle size D 50 0.5 μm, the single crystal morphology of LiNi 0.6 co 0.12 mn 0.28 o 2 Particle size D of ternary material 50 1.5 μm;

[0059] The preparation method of the positive electrode sheet of the lithium ion battery comprises the following steps:

[0060] Mixing conductive carbon black, conductive carbon nanotubes, dimethyl sulfoxide and sodium carboxymethyl cellulose to obtain a conductive slurry, adding the coated modified ternary materia...

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Abstract

The invention provides a lithium ion battery positive pole piece and a preparation method and application thereof, and the preparation method of a coated modified ternary material in the lithium ion positive pole piece comprises the following steps: mixing a binary compound and a ternary material to obtain a mixture, and sintering the mixture to obtain the coated modified ternary material, wherein the binary compound comprises any one of Co-M-X compounds or a combination of at least two of the Co-M-X compounds; M in the Co-M-X compound comprises any one or a combination of at least two of Al, Sn, Ti, Zr, Ba, Mg, Mn, W, Ni, Bi or rare earth elements; and X in the Co-M-X compound is an element O. According to the invention, the coating sintering process of the ternary material is optimized, and the binary compound containing cobalt and another effective element is taken as a coating source, so that the coating effect of the ternary material is optimized, the power performance of the lithium ion battery is improved, and the gas production problem of the lithium ion battery is solved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a lithium-ion battery positive pole piece, in particular to a lithium-ion battery positive pole piece and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in digital products, electric vehicles, and energy storage base stations. With the extensive application of lithium-ion batteries, higher requirements have been put forward for lithium-ion battery cathode materials. Among them, the ternary material LiNi x co y mn 1-x-y o 2 It better combines the advantages of lithium cobaltate, lithium nickelate and lithium manganate. The ternary synergistic effect makes its comprehensive performance better than any single-component compound. Therefore, its theoretical specific capacity is as high as 274mAh / g, and the reaction platform voltage is as high as 3.0-4.4V, stable cycle performance, relatively low cost, good s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525
CPCH01M4/366H01M4/483H01M4/485H01M4/523H01M4/525H01M4/502H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 朱呈岭莫方杰杨元婴孙化雨其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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