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Lithium battery diaphragm compounded from aqueous polymer and inorganic nanoparticles and preparation method thereof

A technology of inorganic nanoparticles and lithium battery separators, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problem that the thermal safety ability is difficult to meet the requirements, achieve good absorption and retention of electrolyte, and improve Effect of wettability and good cycle life

Inactive Publication Date: 2014-11-19
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now large-scale commercial lithium battery separators are mainly made of polypropylene and polyethylene. As people have higher and higher performance requirements for lithium batteries, it is difficult to meet the thermal safety and electrolyte retention ability of these two separators alone. Research on the preparation of high-performance composite diaphragms of other materials and polyolefins has become the most important direction of diaphragm modification

Method used

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  • Lithium battery diaphragm compounded from aqueous polymer and inorganic nanoparticles and preparation method thereof
  • Lithium battery diaphragm compounded from aqueous polymer and inorganic nanoparticles and preparation method thereof
  • Lithium battery diaphragm compounded from aqueous polymer and inorganic nanoparticles and preparation method thereof

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preparation example Construction

[0029] The preparation method is divided into two major steps, first polymer coating, and then ceramic coating on the other side, the specific steps are as follows:

[0030] a) Preparation and coating of aqueous polymer slurry

[0031] a1: Using deionized water as solvent, dissolve water-soluble adhesives, surfactants, dispersants, thickeners, etc. under high-speed stirring at room temperature to form a solution; then add polymer powder particles and stir evenly at high speed. A water-based slurry; the slurry contains 0.1%-2% water-soluble polymer thickener, 0.01%-2% water-based dispersant, 0.01%-1% surfactant, 0.1%-5% water-based Adhesive, 5% to 25% polymer powder particles, 67% to 83% deionized water, all of the above are mass fractions;

[0032] a2: Using micro-gravure roll coating, apply the aqueous slurry prepared in step a1 to one surface of the support layer diaphragm at a coating rate of 5-100m / min;

[0033] a3: Dry the coating film obtained in step a2 in an oven at 30-100°C;...

Embodiment 1

[0043] 1) Preparation of aqueous PVDF slurry

[0044] The polymer coating layer is coated by an aqueous slurry, and the weight ratio of the slurry is PVDF-HFP: deionized water = 100:500. First, add acrylic adhesive and tackifier CMC into deionized water, stir at 300r / min for 20 minutes at room temperature until completely dissolved. The weight ratio of acrylic adhesive and CMC is adhesive: PVDF- HFP=5:100, CMC:PVDF-HFP=1:100. Then add fluorocarbon surfactant, dispersant polyvinylpyrrolidone (PVP) and PVDF-HFP powder to the above solution in sequence, continue to stir at 300r / min for 10min, and finally stir at 5000r / min for 5min at high speed, the slurry configuration is completed. Among them, fluorocarbon surfactant: PVDF-HFP=0.1:100, PVP:PVDF-HFP=0.3:100. The weight average molecular weight of PVDF-HFP is about 140,000, and the particle size is 100-300nm.

[0045] 2) Preparation of ceramic slurry

[0046] Weight ratio in slurry Al 2 O 3 : Deionized water = 100:150. First, add P...

Embodiment 2

[0051] 1) Preparation of aqueous PVDF slurry

[0052] The polymer coating layer is coated by an aqueous slurry, and the weight ratio of the aqueous slurry is PVDF-HFP: deionized water = 100:500. First, add the adhesive PVA and the thickener CMC into deionized water, stir at 300r / min for 20 minutes at room temperature until completely dissolved, the weight ratio of PVA and CMC is PVA: PVDF-HFP = 5: 100, CMC : PVDF-HFP=1:100. Then add fluorocarbon surfactant, dispersant polyoxyethylene dioleate and PVDF-HFP powder to the above solution in sequence, continue to stir at 300r / min for 10min, and finally stir at 5000r / min for 5min, the slurry configuration is complete . Among them, fluorocarbon surfactant: PVDF-HFP=0.1:100, and polyoxyethylene dioleate:PVDF-HFP=0.3:100. The weight average molecular weight of PVDF-HFP is about 140,000, and the particle size is 100-300nm.

[0053] Others are the same as in Example 1.

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Abstract

The invention discloses a lithium battery diaphragm compounded from an aqueous polymer and inorganic nanoparticles. The lithium battery diaphragm comprises a polyolefin supporting layer, wherein one side of the polyolefin supporting layer is polymer coating, and the other side of the polyolefin supporting layer is ceramic coating; the polymer coating and the ceramic coating are compounded by a coating process; coating slurry used by the polymer coating and the ceramic coating is aqueous slurry; the polymer coating at least comprises aqueous adhesive and polymer particles; the ceramic coating at least comprises aqueous adhesive and the inorganic nanoparticles. The invention further discloses a preparation method of the lithium battery diaphragm. The invention has the advantages as follows: the prepared lithium battery diaphragm is high in thermal safety and long in cycle life; environment pollution is low during preparation.

Description

Technical field [0001] The invention relates to a lithium ion battery diaphragm, in particular to a lithium battery diaphragm composed of an aqueous polymer and inorganic nanoparticles with high thermal safety performance, long cycle life, and less environmental pollution, and a preparation method thereof. Background technique [0002] With the popularization of 3C products and the rise of the electric vehicle market, the demand for lithium ion secondary batteries is increasing. As a key component of a lithium-ion battery, the performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the battery's capacity, cycle and safety performance. A diaphragm with excellent performance plays an important role in improving the overall performance of the battery. Therefore, the development of high-performance separators has become an important direction for improving the performance of lithium batteries, especially the safet...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/443H01M50/489H01M50/491
CPCH01M10/0525H01M50/403H01M50/446H01M50/491H01M50/443H01M50/489Y02E60/10
Inventor 王郗陈世章李旦邓豪陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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