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A preparation method of water-based PVDF slurry for lithium-ion battery diaphragm with stable system

A technology for lithium ion batteries and separators is applied in the field of preparation of water-based PVDF slurry for lithium ion battery separators, which can solve the problems of poor adhesion, high air permeability, poor storage stability, etc., so as to reduce the risk of porosity and achieve stable storage. good effect

Active Publication Date: 2020-11-27
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a stable lithium-ion battery diaphragm water-based PVDF slurry and its preparation method, through the adjustment of the slurry formula and process, to solve the current lithium-ion battery diaphragm water-based PVDF slurry The slurry system has the problems of poor storage stability, high air permeability increase and poor cohesiveness

Method used

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  • A preparation method of water-based PVDF slurry for lithium-ion battery diaphragm with stable system
  • A preparation method of water-based PVDF slurry for lithium-ion battery diaphragm with stable system
  • A preparation method of water-based PVDF slurry for lithium-ion battery diaphragm with stable system

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Embodiment 1

[0024] A preparation method of a water-based PVDF slurry for lithium-ion battery separators with stable systems, comprising the steps of:

[0025] (1) Preparation of formula 1# stock solution: After mixing and stirring 14kg PVDF powder, 80kg deionized water, 1.2kg polyether modified dimethyl siloxane, 1.0kg polyacrylic acid, 3kg styrene-acrylic emulsion, at a speed of 800rpm Grinding for 40min at lower speed, and preparing formula 1# stock solution;

[0026] (2) Preparation of formula 2# stock solution: 14kg PVDF powder, 80kg deionized water, 2kg polyacrylic acid ammonium salt, 1.2kg polyether modified dimethyl siloxane (organosilicon modified surfactant), 1.2kg polyether After mixing and stirring the modified dimethyl siloxane and 1.0 kg polyacrylic acid, grind for 40 min at a rotational speed of 800 rpm, add 3 kg of styrene-acrylic emulsion and continue grinding for 20 min to prepare formula 2# stock solution;

[0027] (3) Preparation of PVDF slurry: Mix formula 1# stock so...

Embodiment 2

[0030] A preparation method of a water-based PVDF slurry for lithium-ion battery separators with stable systems, comprising the steps of:

[0031] (1) Formula 1# stock solution preparation: After mixing 14kg PVDF powder, 80kg deionized water, 1.2kg polyether modified dimethyl siloxane, 1.0kg polyacrylic acid, 3kg pure acrylic emulsion, under the condition of 800rpm Grinding for 40min at lower speed, and preparing formula 1# stock solution;

[0032] (2) Formula 2# stock solution preparation: 14kg PVDF powder, 80kg deionized water, 2kg polyacrylic acid potassium salt, 1.2kg polyether modified ethoxylated dimethylsiloxane (organosilicon modified surfactant), After mixing and stirring 1.2 kg of polyether-modified dimethylsiloxane and 1.0 kg of polyacrylic acid, grind for 40 minutes at a rotational speed of 800 rpm, add 3 kg of pure acrylic emulsion and continue grinding for 20 minutes to prepare formula 2# stock solution;

[0033] (3) Preparation of PVDF slurry: Mix formula 1# st...

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Abstract

The invention discloses a preparation method of a water-based PVDF slurry for a lithium-ion battery diaphragm with a stable system, comprising the following steps: (1) adding PVDF powder, deionized water, polyether-modified silicone polymer, Thickener and water-based acrylic polymer emulsion are mixed and stirred, then ground to obtain formula 1# stock solution; (2) PVDF powder, deionized water, polyacrylate, polyether modified silicone polymer, silicone modified surface active After mixing and stirring the alkali-swellable thickener and the alkali-swellable thickener, grind, add water-based acrylic polymer emulsion and continue grinding to obtain the original solution of formula 2#; (3) stir and mix the original solution of formula 1# and the original solution of formula 1# according to a certain ratio to prepare PVDF slurry; (4) coating and drying to obtain a PVDF-coated separator. The slurry system prepared by the invention has good storage stability (no delamination and no sedimentation), the air permeability increase rate can be adjusted in 8-80s, and the bonding performance can be adjusted according to the specific requirements of customers.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing a water-based PVDF slurry for a lithium-ion battery diaphragm with a stable system. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection. They are widely used in portable electronic devices, power tools, electric vehicles, and energy storage. [0003] The separator is a critical inner layer component in lithium-ion batteries. Key properties such as battery capacity, cycle performance, charge and discharge current density, high temperature resistance, high strength, and safety guarantee are directly related to the separator. [0004] With the promotion of ternary batteries and the increasing demand for energy density of lithium iron phosphate batteries, ceramic diaphragms instead of ordinary diaphragms are an inevitable cho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/426H01M50/443H01M50/449H01M50/489
CPCH01M10/0525H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 陶晶杜辉罗婷王思双
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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