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Lithium ion battery diaphragm prepared from inorganic-organic composite material

A technology for lithium ion batteries and composite materials, applied in the field of ion batteries, can solve the problems of poor thermal stability and poor wettability of electrolyte, and achieve the effects of high thermal stability, process saving and good electrochemical stability.

Pending Publication Date: 2021-03-19
宁波启新精合新能源研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of this type of separator are cheap price, good mechanical properties, and good electrochemical stability; but there are also problems of poor wettability to the electrolyte and poor thermal stability.

Method used

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  • Lithium ion battery diaphragm prepared from inorganic-organic composite material

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Effect test

Embodiment 1

[0035] A lithium ion battery diaphragm prepared using an inorganic organic composite material includes a three-layer polyolefin-based porous film that is superimposed in sequentially, adjacent two-layer polyolefin-based porous membrane is bonded through inorganic organic composite. fixed;

[0036] Among them, inorganic organic composite compounds are calculated according to weight, including the following ingredients:

[0037] 40 parts of the polyolefin emulsion, 8 bonding agents, 5 parts of nanoscale modified composite fibers, 0.3 dispersants, 0.3 plasticizers.

[0038] The polyolefin emulsion is a polyvilted fluoride emulsion.

[0039] In the polyfial fluoride emulsion, the solid content of polyvinylidene ethylene is 60%.

[0040] The adhesive is a polyacrylate waterborne binder.

[0041] The dispersing agent is ammonium polyacrylate.

[0042] The plasticizer is a di (2-ethyl) ester of phthalate.

[0043] The nanometer-based modified composite fiber is nanometer-stage tantalum o...

Embodiment 2

[0059] A lithium ion battery diaphragm prepared using an inorganic organic composite material including a polyolefin-based porous film sequentially superimposed, adjacent two-layer polyolefin-based porous membrane bonded through inorganic organic composite. fixed;

[0060] Among them, inorganic organic composite compounds are calculated according to weight, including the following ingredients:

[0061] 30 parts of polyolefin emulsion, 5 bonding agents, 3 nano-modified composite fibers, 0.2 dispersants, and 0.1 parts of plasticizer.

[0062] The polyolefin emulsion is a polytetrafluoroethylene emulsion.

[0063] In the polytetrafluoroethylene emulsion, the solid content of polyvinylidene ethylene is 60%.

[0064] The adhesive is a polyacrylate waterborne binder.

[0065] The dispersing agent is ammonium polyacrylate.

[0066] The plasticizer is a di (2-ethyl) ester of phthalate.

[0067] The nanometer-based modified composite fiber is nanometer-stage tantalum oxide / carbon-modifie...

Embodiment 3

[0083] A lithium ion battery diaphragm prepared using an inorganic organic composite, the lithium ion battery diaphragm comprising four layers of polyolefin-based porous membranes, adjacent two-layer polyolefin-based porous membrane, bonded through inorganic organic composite fixed;

[0084] Among them, inorganic organic composite compounds are calculated according to weight, including the following ingredients:

[0085] 50 parts of polyolefin emulsion, 10 adhesives, 8 nano-modified composite fibers, 0.5 dispersants, 0.5 plasticizers.

[0086] The polyolefin emulsion is a polyvilted fluoride emulsion.

[0087] In the polyfial fluoride emulsion, the solid content of polyvinylidene ethylene is 60%.

[0088] The adhesive is a polyacrylate waterborne binder.

[0089] The dispersing agent is ammonium polyacrylate.

[0090] The plasticizer is a di (2-ethyl) ester of phthalate.

[0091] The nanometer-based modified composite fiber is nanometer-stage tantalum oxide / carbon-modified compo...

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Abstract

The invention relates to a lithium ion battery diaphragm prepared from an inorganic-organic composite material. The lithium ion battery diaphragm comprises at least two layers of polyolefin-based porous membranes which are stacked in sequence, and two adjacent layers of polyolefin-based porous membranes are bonded and fixed through an inorganic-organic composite material liquid; wherein the inorganic-organic composite material liquid is prepared from the following components in parts by weight: 30 to 50 parts of polyolefin emulsion, 5 to 10 parts of adhesive, 3 to 8 parts of nanoscale modifiedcomposite fiber, 0.2 to 0.5 part of dispersing agent and 0.1 to 0.5 part of plasticizer. The prepared lithium ion battery diaphragm is relatively stable in performance, is particularly applied to a lithium ion battery for an electric vehicle, and can tolerate relatively high temperature in the working process of the electric vehicle, and the diaphragm shrinkage rate is remarkably reduced comparedwith that of an existing polyolefin-based diaphragm, so that the overall service life of the battery is remarkably prolonged, and the safety is greatly improved; and the use convenience, the safety and the stability of the electric product are also improved.

Description

Technical field [0001] The present invention relates to the field of ion batteries, and more particularly to a lithium ion battery diaphragm prepared using an inorganic organic composite. Background technique [0002] The trend of electricization is more intensified, and the state encourages the use of high-energy density batteries and is getting higher and higher in battery safety. Lithium-ion batteries have become one of the new energy sources in its high energy density and long cycle life, but in recent years, mobile phones, automobiles and other electronic / power systems are frequent, and lithium-ion batteries bring us convenience. Also accompanied by dangerous hazards. As a diaphragm of one of the four major materials of the lithium battery, the material is generally a polyolefin-based porous film, and the battery diaphragm is mainly separated from the positive and negative electrode, avoiding battery short circuit, ensuring Li + The passability ensures smooth role of the b...

Claims

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Application Information

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IPC IPC(8): H01M50/451H01M50/457H01M10/0525B82Y30/00B82Y40/00
CPCH01M10/0525B82Y30/00B82Y40/00H01M2220/20Y02E60/10
Inventor 李埃荣李伟力王新龙小泽康典徐永纪
Owner 宁波启新精合新能源研究院有限公司
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