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Hydrophobic lithium battery positive electrode material, positive electrode and preparation method of positive electrode

A cathode material, lithium battery technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of battery manufacturing process troubles, difficult to control battery performance consistency, poor slurry stability, etc., to improve the first round Efficiency and circulation capacity, reducing the difficulty of moisture control, the effect of not easily absorbing moisture

Pending Publication Date: 2021-02-23
华鼎国联动力电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially high-nickel cathode materials, due to the increase of nickel content, the stability of the material decreases, the surface alkali content increases, and it is easy to absorb moisture and carbon dioxide in the air, which has caused a lot of troubles in the battery manufacturing process
For example, gelation is prone to occur during the homogenization stage, resulting in unusable slurry or poor slurry stability; during the electrode flow process, due to process control and flow time differences, it is difficult to control the consistency of battery performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Preparation of hydrophobic cathode materials for lithium batteries

[0019] Disperse 100g of 811 type nickel cobalt lithium manganese oxide in 500mL ethanol, add 0.05g (CH 3 ) 3 -Si-OCH 2 CH 3 , mixed evenly, then filtered and dried to obtain a hydrophobic lithium battery positive electrode material.

[0020] 2. Hydrophobic lithium battery positive electrode sheet

[0021] 2.1 Homogenization: Take 2000g of the hydrophobic lithium battery cathode material prepared in step 1, add 40g of carbon tube slurry (5% solid content), 20g of conductive carbon black, and 500g of PVDF glue (6%), and use a homogenizer at 15rpm Stir for half an hour, add 500g of PVDF glue (6%) and 200mL of NMP, and filter the slurry with a 200-mesh filter;

[0022] 2.2 Coating and rolling: Coat the slurry on a 13 micron thick aluminum foil with a surface density of 15mg / cm 2 ; The pole piece is rolled and pressed, and the thickness of the positive electrode material is 45 μm to make the positi...

Embodiment 2

[0025] 1. Preparation of hydrophobic cathode materials for lithium batteries

[0026] Disperse 100g of 622-type nickel-cobalt lithium manganate in 500mL of ethanol, add 0.03g of CH 3 (CH 2 ) 15 -Si-OCH 2 CH 3 , mixed evenly, then filtered and dried to obtain a hydrophobic lithium battery positive electrode material.

[0027] 2. Hydrophobic lithium battery positive electrode sheet

[0028] 2.1 Homogenization: Take 2000g of the hydrophobic lithium battery cathode material prepared in step 1, add 40g of carbon tube slurry (5% solid content), 20g of conductive carbon black, and 500g of PVDF glue (6%), and use a homogenizer at 15rpm Stir for half an hour, add 500g of PVDF glue (6%) and 200mL of NMP, and filter the slurry with a 200-mesh filter;

[0029] 2.2 Coating and rolling: Coat the slurry on a 13 micron thick aluminum foil with a surface density of 15mg / cm 2 ; The pole piece is rolled and pressed, and the thickness of the positive electrode material is 45 μm to make the...

Embodiment 3

[0032] 1. Preparation of hydrophobic cathode materials for lithium batteries

[0033] Disperse 100g NCA lithium nickel cobalt aluminate in 500mL ethanol, add 0.04g CH 3 (CH 2 ) 12 -Si-OCH 2 CH 3 , mixed evenly, then filtered and dried to obtain a hydrophobic lithium battery positive electrode material.

[0034] 2. Hydrophobic lithium battery positive electrode sheet

[0035] 2.1 Homogenization: Take 2000g of the hydrophobic lithium battery cathode material prepared in step 1, add 40g of carbon tube slurry (5% solid content), 20g of conductive carbon black, and 500g of PVDF glue (6%), and use a homogenizer at 15rpm Stir for half an hour, add 500g of PVDF glue (6%) and 200mL of NMP, and filter the slurry with a 200-mesh filter;

[0036] 2.2 Coating and rolling: Coat the slurry on a 13 micron thick aluminum foil with a surface density of 15mg / cm 2 ; The pole piece is rolled and pressed, and the thickness of the positive electrode material is 45 μm to make the positive elec...

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Abstract

The invention relates to a hydrophobic lithium battery positive electrode material, a positive electrode and a preparation method of the positive electrode. The hydrophobic lithium battery positive electrode material is formed by combining a hydrophobic modifier on the surface of a conventional lithium battery positive electrode material, and the molecular structure of the hydrophobic modifier isR-Xn; R represents an alkyl group having 6 to 18 carbon atoms and optionally having a substituent selected from the group consisting of an alkyl group, an aryl group and an alkoxy group; X is -Si-(R2)3OR1 or carboxyl, and R1 and R2 are methyl or ethyl; and n is 1, 2, 3 or 4. The positive electrode material does not easily absorb moisture in the processes of electrode preparation and electrode circulation, the control difficulty of the electrode process is reduced, and meanwhile, the moisture control of a pole piece and the improvement of electrolyte infiltration characteristics are facilitated.

Description

technical field [0001] The invention relates to a hydrophobic lithium battery cathode material, the cathode and a preparation method thereof, and belongs to the technical field of lithium battery electrode materials. Background technique [0002] Lithium batteries are very sensitive to moisture. High moisture will cause SEI film decomposition, electrolyte decomposition, and side reactions to intensify, resulting in battery efficiency decline, capacity attenuation, gas expansion, and even fire and explosion accidents in severe cases. Therefore, when the electrode is assembled into a battery, it must be ensured that the electrode moisture is controlled within the required range before liquid injection. In order to ensure that the electrode moisture meets the control requirements, the humidity of the production environment during battery preparation, assembly, and liquid injection is usually -35 to -40°C dew point temperature. At the same time, strict vacuum baking is required ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/505H01M4/525H01M4/04H01M4/131H01M4/1391H01M10/052
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M4/131H01M4/1391H01M4/0404H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 梁亚杰周朝辉周永涛周鼎孙延先
Owner 华鼎国联动力电池有限公司
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