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High temperature-resistant cellulose fiber base material-containing lithium ion battery diaphragm and preparation method of the same

A cellulose fiber, lithium electronic battery technology, applied in cellulose plastic material layered products, battery pack parts, chemical instruments and methods, etc., can solve the problems of easy powder loss, poor consistency of diaphragm, increased production cost, etc. Achieve the effect of preventing dendrite piercing, improving precision coating, and preventing battery short circuit

Active Publication Date: 2015-04-29
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diaphragm is easy to lose powder during vibration, curling and folding, and the consistency of the diaphragm is poor
The invention patent applied by Xiamen University with the publication number CN 1312789C uses Celgard 2400 as the substrate and nano-SiO 2 The mixed solution of polyoxyethylene and acetonitrile is used as the coating for the diaphragm coating to prepare the composite lithium battery diaphragm, but the base material used in the diaphragm needs to be imported, which will increase the production cost

Method used

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  • High temperature-resistant cellulose fiber base material-containing lithium ion battery diaphragm and preparation method of the same
  • High temperature-resistant cellulose fiber base material-containing lithium ion battery diaphragm and preparation method of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Inorganic coating preparation

[0037] Add 3g of polyvinylidene fluoride and 0.5g of polyimide into 150g of N-methylpyrrolidone and heat and stir at a temperature of 50°C for 2 hours. Add 0.5g methyltriethoxysilane and 100g aluminum oxide (particle size distribution range: D to the above mixture) 10 : 1.5 μm, D 50 : 2.5 μm, D 97 : 3.5 μm), homogenize for 0.5 h at 100 MPa with an ultra-high pressure nano homogenizer, until the particles are completely dispersed in the coating, that is, the inorganic coating is prepared.

[0038] 2. Preparation of high temperature resistant lithium ion battery separator

[0039] The diaphragm base material is made of 90% Tencel fiber and 10% cotton fiber (the average diameter of Tencel fiber and cotton fiber is 2 μm, and the aspect ratio is 100). The thickness is 15 μm, the porosity is 80%, and the air permeability is 8sec / 100cc. Among them, the cotton fiber and tencel fiber need to be beaten to separate the single fiber into fila...

Embodiment 2

[0042] 1. Inorganic coating preparation

[0043] Add 2.5g of polyvinylidene fluoride, 0.5g of polyimide and 0.5g of polyethersulfone into 150g of N-methylpyrrolidone and heat and stir at a temperature of 50°C for 2 hours. Add 0.3g methyltriethoxysilane, 0.2g vinyltriethoxysilane and 100g aluminum oxide (particle size distribution range: D to the above mixture) 10 : 1 μm, D 50 : 2 μm, D 97 : 3 μm), homogenize for 0.5 h at 100 MPa with an ultra-high pressure nano homogenizer, until the particles are completely dispersed in the coating, that is, the inorganic coating is prepared.

[0044] 2. Preparation of high temperature resistant lithium ion battery separator

[0045] The diaphragm substrate adopts 80% tencel fiber, 10% viscose fiber and 10% bamboo fiber (the average diameter of tencel fiber and bamboo fiber is 0.5 μm, the aspect ratio is 200, and the viscose fiber fineness is 0.5D , The average length is 2mm) common papermaking, the thickness is 20μm, the porosity is 70%,...

Embodiment 3

[0048] 1. Inorganic coating preparation

[0049] Add 3.0g of polyvinylidene fluoride, 1.5g of polyimide and 0.5g of polyethersulfone into 150g of N-methylpyrrolidone and heat and stir at a temperature of 50°C for 2 hours. Add 0.3g methyltriethoxysilane, 0.2g vinyltris(2-methoxyethoxy)silane and 100g aluminum oxide (particle size distribution range: D) to the above mixture 10 : 1 μm, D 50 : 2 μm, D 97 : 3 μm), homogenize for 0.5 h at 100 MPa with an ultra-high pressure nano homogenizer, until the particles are completely dispersed in the coating, that is, the inorganic coating is prepared.

[0050] 2. Preparation of high temperature resistant lithium ion battery separator

[0051] The diaphragm base material adopts 90% tencel fiber, 5% viscose fiber, 2.5% ramie fiber and 2.5% flax fiber (the average diameter of tencel fiber, ramie fiber and flax fiber is 1.0 μm, and the aspect ratio is 50 , The viscose fiber fineness is 0.5D, the average length is 2mm), and the thickness is...

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Abstract

The invention discloses a high temperature-resistant cellulose fiber base material-containing lithium ion battery diaphragm and a preparation method of the same. The battery diaphragm is characterized in that the thickness is 20-40 micrometers, the poriness is 40-60%, the gas permeability is 15-30sec / 100cc; and the diaphragm comprises the cellulose fiber base material, a porous bonding layer and an inorganic coating layer. The preparation method comprises the following steps of: mechanically foaming the waterborne polyurethane emulsion, conveying the foam glue to a foam bath device, dragging and immersing the cellulose fiber base material in the foam bath for gluing, and forming the porous bonding layer on the surface of the base material by the foam glue; spreading an inorganic coating on the surfaces of the cellulose fiber base material and the porous bonding layer to form the inorganic coating layer compositely; and drying. The battery diaphragm provided by the invention has better solution absorption and solution preserving capability to the electrolyte; the battery diaphragm cannot shrink, and the hot-shrinkage rates in longitudinal direction and transverse direction both are less than 2%; and the battery diaphragm is relatively high in ion penetrability, relatively lower in resistance, excellent in mechanical performance and steady in electrochemical performance, and can prevent battery short circuit and dendritic crystal diapirism.

Description

technical field [0001] The invention relates to a high-temperature-resistant lithium-ion battery diaphragm containing a cellulose fiber base material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, lithium-ion battery separator materials are mainly polyolefin separators such as single-layer polypropylene (PP) microporous membranes, single-layer polyethylene (PE) microporous membranes, and three-layer PP / PE / PP composite membranes. Mainly dry stretching porogenic method and wet phase separation method. The disadvantages of polyolefin separators are: 1. The polyolefin separator is easy to shrink when heated, which will cause the size of the separator to be unstable, and the positive and negative electrodes will be in direct contact with each other to cause a short circuit; At this time, a large amount of heat is released inside the battery, causing the diaphragm to completely melt and shrink...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/18H01M2/16B32B23/00
CPCY02E60/10
Inventor 吴立群贺磊杨娇
Owner CHINA HAISUM ENG
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