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Lithium ion battery composite diaphragm, preparation method thereof and lithium ion battery

A technology of lithium-ion batteries and composite diaphragms, applied in secondary batteries, battery components, circuits, etc., can solve problems such as poor stability and poor safety performance, and achieve the goal of improving uniformity, improving safety performance, and reducing irreversible capacity Effect

Active Publication Date: 2016-11-16
LUOYANG LIRONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium supplementation is mainly through positive and negative pole pieces, but the main disadvantages of lithium supplementation in positive and negative pole pieces are poor stability and poor safety performance.

Method used

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  • Lithium ion battery composite diaphragm, preparation method thereof and lithium ion battery

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Effect test

Embodiment 1

[0044] The lithium-ion battery composite diaphragm of the present embodiment includes a diaphragm substrate 1, the diaphragm substrate includes a polyolefin microporous membrane and ceramic layers 2 coated on both surfaces of the polyolefin microporous membrane, and the surfaces of the two ceramic layers are coated with Lithium supplementation layer 3; the ceramic layer is composed of 15 parts by weight of aluminum oxide powder, 15 parts by weight of lithium metaaluminate powder and 3 parts by weight of polyvinylidene fluoride uniformly mixed and bonded together; the lithium supplementation layer It consists of 3 parts by weight of lithium powder, 3 parts by weight of graphene, 15 parts by weight of polypropylene carbonate, and 15 parts by weight of composite polyethylene uniformly mixed and bonded together, wherein the particle size of lithium powder is 0.1mm, composite polyethylene is composed of high-density polyethylene with a weight-average molecular weight of 100,000 and ...

Embodiment 2

[0051] The lithium-ion battery composite diaphragm of this embodiment includes a diaphragm base, and the diaphragm base includes a polyolefin microporous membrane and ceramic layers coated on both surfaces of the polyolefin microporous membrane, and the surfaces of the two ceramic layers are coated with lithium-supplementing layer; the ceramic layer is composed of 10 parts by weight of aluminum oxide powder, 10 parts by weight of lithium metaaluminate powder and 1 part by weight of polyvinylidene fluoride uniformly mixed and bonded together; the lithium supplement layer consists of 1 weight part 1 part by weight of lithium powder, 1 part by weight of graphene, 10 parts by weight of polypropylene carbonate, and 10 parts by weight of composite polyethylene are uniformly mixed and bonded together to form, wherein the particle diameter of lithium powder is 0.075mm, Composite polyethylene is composed of high-density polyethylene with a weight-average molecular weight of 300,000 and ...

Embodiment 3

[0058] The lithium-ion battery composite diaphragm of this embodiment includes a diaphragm base, and the diaphragm base includes a polyolefin microporous membrane and ceramic layers coated on both surfaces of the polyolefin microporous membrane, and the surfaces of the two ceramic layers are coated with lithium-supplementing layer; the ceramic layer is composed of 20 parts by weight of aluminum oxide powder, 18 parts by weight of lithium metaaluminate powder and 5 parts by weight of polyvinylidene fluoride uniformly mixed and bonded together; the lithium supplementary layer is composed of 5 parts by weight The lithium powder of 5 parts by weight, the graphene of 5 parts by weight, the polypropylene carbonate of 20 parts by weight, the composite polyethylene of 20 parts by weight are uniformly mixed and bonded together to form, wherein, the particle diameter of lithium powder is 0.15mm, Composite polyethylene is composed of high-density polyethylene with a weight-average molecul...

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Abstract

The invention relates to a lithium ion battery composite diaphragm, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery composite diaphragm comprises a diaphragm matrix, wherein the diaphragm matrix is a polyolefin microporous membrane or a polyolefin microporous membrane whose surface is coated with a ceramic layer; a surface of the diaphragm matrix is coated with a lithium supplementing layer; and the lithium supplementing layer contains lithium powder. According to the lithium ion battery composite diaphragm, the surface of the diaphragm is provided with the lithium supplementing layer, lithium required for forming an SEI (Solid Electrolyte Interface) film is filled up, supplementationis provided for lithium ions consumed by formation of the SEI film on a surface of a negative pole piece, the irreversible capacity of the lithium ion battery is reduced, and the initial efficiency, the cycle performance and the energy density of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to a lithium-ion battery composite diaphragm, a preparation method thereof, and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are favored by people for their high energy density, high cycle performance, and environmental friendliness, and are widely used in technical fields such as electric vehicles, digital, electric tools, and energy storage. However, with the continuous expansion of the application field of lithium-ion batteries, higher requirements are put forward for the energy density of lithium-ion batteries. At present, the main methods to improve the energy density of lithium-ion batteries are: using high-capacity positive and negative electrode materials, using high-voltage electrolytes, using thinner separators and current collectors, and modifying materials and battery systems. For high-capacity positive and negative electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/451H01M50/457H01M50/497
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 李志王燕
Owner LUOYANG LIRONG NEW ENERGY TECH
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