Lithium ion battery positive electrode slurry as well as preparation method and application thereof

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems affecting the electrochemical performance of single-crystal ternary cathodes, poor electronic conductance and ion transport of cathode sheets, and electronic conductance. problems such as poor ion transmission and poor ion transmission, to achieve the effect of being conducive to liquid absorption, high gram capacity, and improved electronic conductance

Pending Publication Date: 2020-07-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the solution to the problem of poor electronic conductivity and ion transport of single crystal materials is mainly carried out from two aspects: material coating and positive electrode conductive agent optimization, but material coating will increase the cost of ternary materials, and the optimization of conductive agent is mainly composite conductive agent , but the existing positive plate prepared by composite conductive agent can not solve the problem of single crystal ternary material, such as pre-mixing binder solution and carbon nanotubes and then adding conductive agent SP (conductive carbon black), KS6 ( Conductive graphite), after uniform mixing, add the positive electrode active material to obtain the positive electrode slurry, and then use the positive electrode slurry to coat and dry the positive electrode shee

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  • Lithium ion battery positive electrode slurry as well as preparation method and application thereof
  • Lithium ion battery positive electrode slurry as well as preparation method and application thereof
  • Lithium ion battery positive electrode slurry as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0053] Example 1

[0054] (1) Preparation of lithium ion battery cathode slurry

[0055] The positive active material is a single crystal ternary material (LiNi 0.8 Co 0.1 Mn 0.1 O 2 ), the binder is polyvinylidene fluoride (PVDF), the solvent is N-methylpyrrolidone (NMP), and the conductive agent includes a first conductive agent and a second conductive agent. Preparation methods include:

[0056] 1) Add graphene, carbon nanotubes and conductive carbon black to a solvent containing a dispersant, mix them evenly and grind to a fineness of not more than 40μm to obtain the first conductive agent, including carbon nanotubes, graphene, conductive carbon black, The mass ratio of dispersant to solvent is 1.5:0.5:2:1:95.

[0057] 2) Mixing and stirring the positive active material, PVDF, the first conductive agent and NMP to obtain a mixed slurry;

[0058] 3) Add the second conductive electrode to the mixed slurry and stir to obtain the positive electrode slurry,

[0059] Wherein, the second ...

Example Embodiment

[0064] Example 2

[0065] (1) Preparation of lithium ion battery cathode slurry

[0066] The difference from Embodiment 1 is:

[0067] In the first conductive agent, the mass ratio of carbon nanotubes, graphene, conductive carbon black, dispersant and solvent is 2:0.5:1.4:1.1:95;

[0068] The mass ratio of the total mass of carbon nanotubes, graphene and conductive carbon black in the first conductive agent to the second conductive agent is 2:0.5;

[0069] The mass ratio of the total mass of the positive active material, the binder, the first conductive agent and the second conductive agent, and the solvent is 60:1:21:18.

[0070] (2) Making a lithium battery using the prepared lithium ion battery cathode slurry

[0071] The same as in Example 1.

Example Embodiment

[0072] Example 3

[0073] (1) Preparation of lithium ion battery cathode slurry

[0074] The difference from Embodiment 1 is:

[0075] In the first conductive agent, the mass ratio of carbon nanotubes, graphene, conductive carbon black, dispersant and solvent is 2:0.8:3.2:1:94;

[0076] The mass ratio of the total mass of carbon nanotubes, graphene and conductive carbon black in the first conductive agent to the second conductive agent is 2:0.5;

[0077] The mass ratio of the total mass of the positive electrode active material, the binder, the first conductive agent and the second conductive agent, and the solvent is 58:1:23:18.

[0078] (2) Making a lithium battery using the prepared lithium ion battery cathode slurry

[0079] The same as in Example 1.

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Abstract

The invention discloses a lithium ion battery positive electrode slurry as well as a preparation method and application thereof. The preparation method comprises the following steps of (1) mixing a positive active material, a binder, a first conductive agent and a solvent to obtain the mixed slurry; and (2) mixing the mixed slurry with a second conductive agent so as to obtain the lithium ion battery positive electrode slurry, wherein the first conductive agent is composed of carbon nanotubes, graphene, conductive carbon black, a dispersing agent and the solvent, and the second conductive agent is conductive carbon black. By adopting the method, the distribution of the conductive agent in a positive plate can be remarkably improved, and the problem of poor electronic conductivity and ion transmission of the positive plate is solved, so that the positive plate can exert higher gram volume, and has better rate capability, low-temperature performance and cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a positive electrode slurry of a lithium ion battery and a preparation method and application thereof. Background technique [0002] At present, the ternary cathode material LiNi x co y mn (1-x-y) o 2 Due to the characteristics of high gram capacity, high compacted density, and high voltage, it is more and more widely used in lithium-ion batteries, especially in the field of power batteries. Among them, single crystal ternary materials have better structural stability, especially Under high voltage conditions, it is also favored by power batteries. However, due to the large individual particles of single crystal materials, the electronic conductance and ion transport are poor. Contents of the invention [0003] The present invention mainly proposes based on the following problems: [0004] At present, the solution to the problem of poor electronic conductivity...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/625H01M4/622H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 孙洋洋刘静其他发明人请求不公开姓名
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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