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Preparation method for positive electrode of ternary power lithium ion battery and lithium ion battery

A lithium-ion battery and power technology technology, applied in the field of lithium-ion batteries, can solve the problems of lithium-ion battery energy density, power performance cycle performance cannot be satisfied, etc., and achieve high-rate fast charge and discharge, high ionic conductivity, and adhesion. Good results

Inactive Publication Date: 2019-06-14
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the energy density, power performance and cycle performance of existing lithium-ion batteries cannot meet the existing needs, and to provide a method for preparing the positive electrode of a ternary power lithium-ion battery and a lithium-ion battery. By optimizing the positive electrode The formulation of the slurry enables the active material to form a conductive layer of active material combining points, lines and surfaces

Method used

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  • Preparation method for positive electrode of ternary power lithium ion battery and lithium ion battery

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specific Embodiment approach 1

[0011] Specific Embodiment 1: This embodiment records a method for preparing the positive electrode of a ternary power lithium-ion battery. Adhesive and NMP, stir and disperse evenly at a revolution speed of 20~60rpm, and a dispersion disc speed of 200~2000rpm, adjust the revolution speed to 10~30rpm, take the material and measure the solid content (the purpose of measuring the solid content is to confirm the actual feeding of the process and the theoretical solid content) If there is any abnormality, you can control the solid content of the slurry within a reasonable range by adjusting the amount of solvent), and turn on the vacuum pump to keep the vacuum at -0.08~-0.09MPa , after stirring for 30 minutes, release the vacuum to obtain the positive electrode slurry, and apply the obtained positive electrode slurry on the positive electrode current collector to obtain the positive electrode. The method may also include: passing the obtained positive electrode slurry through a 20...

specific Embodiment approach 2

[0012] Specific embodiment two: the preparation method of a positive electrode of a ternary power lithium ion battery described in specific embodiment one, the described ternary NCM is a high-power type NCM or a high-energy type NCM; the described high-power type NCM is NCM111 or NCM622, the particle size is D10 1.0~3.8μm, D50 4.0~8.0μm, D90 ≤17μm; the high-energy NCM is one of NCM523, NCM622, NCM811 or NCA.

specific Embodiment approach 3

[0013] Specific embodiment three: the preparation method of a positive electrode of a ternary power lithium-ion battery described in specific embodiment one, the positive electrode binder is PVDF series or acrylic ester; the PVDF series is polyvinylidene fluoride 5130 or polyvinylidene fluoride 900, the acrylates are polybutyl acrylate, polymethyl methacrylate or cyanoacrylate.

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Abstract

The invention relates to a preparation method for a positive electrode of a ternary power lithium ion battery and the lithium ion battery, and belongs to the technical field of lithium ion batteries.The invention aims at solving the problems that the energy density, the power performance and the cycle performance of an existing lithium ion battery cannot meet the existing requirements. The methodcomprises the following steps of opening a stirring tank, adding a conductive agent, a ternary NCM, a positive electrode adhesive and NMP according to a mass ratio designed by a formula, stirring anduniformly dispersing at the revolution speed of 20-60 rpm and the rotating speed of a dispersing disc of 200-2000 rpm, adjusting the revolution speed to be 10-30 rpm, taking the material and measuring a solid content, opening a vacuum pump, keeping the vacuum degree to -0.08 to 0.09 MPa, stirring for 30 minutes, discharging the vacuum to obtain positive electrode slurry, and coating the positiveelectrode slurry on a positive electrode current collector in order to obtain the positive electrode. The prepared positive electrode is good in bonding force, high in ionic conductivity and capable of realizing high-rate rapid charging and discharging of the ternary lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode of a ternary power lithium ion battery and the lithium ion battery. Background technique [0002] The development of a high-energy-density power battery system is an international mainstream trend. High energy density is one of the core technical indicators of power batteries in my country's "13th Five-Year Plan". This is also driven by the fact that the current industrialized electric vehicle range has not yet met market demand inevitable result. At present, the high energy density system of international industrialization is mainly ternary. Global lithium battery production and sales (production value over 100 billion). While developing high energy density ternary batteries, there are also higher requirements in terms of power performance and cycle performance. Contents of the invention [0003] The purp...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/04H01M4/66H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 申红光靳玲玲刘城赖冠全李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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