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Composite separator and lithium ion battery containing the same

A technology of lithium-ion batteries and composite diaphragms, which is applied to secondary batteries, battery pack components, circuits, etc., can solve the problems of battery shipment safety hazards, high self-discharge rate, poor battery consistency, etc., to improve work efficiency and The effect of good product accuracy, high tensile and puncture strength, and large closed-cell melting temperature difference

Inactive Publication Date: 2019-05-21
TIANJIN SINOPOLY NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art: (1) the non-woven diaphragm has large aperture and wide distribution, low puncture and tensile strength, and its battery is easy to generate lithium dendrites, piercing the diaphragm, and easily causing battery Internal micro-short circuit, battery temperature rises during charging and discharging, poor cycle performance, high self-discharge rate, poor battery consistency, and poor safety performance; (2) The breakdown voltage of the non-woven separator is low, and it is easy to break down when using traditional methods to measure short circuits Diaphragm, which causes a lot of trouble for the selection of good products, and also buryes safety hazards for subsequent battery shipments; (3) Existing composite separators (composite separators such as polyolefin coated high-temperature resistant coatings and non-woven fabrics coated ceramics) It cannot meet the characteristics of moderate pore size and narrow distribution, high temperature resistance, closed cell temperature, simple manufacturing process, and low cost at the same time, especially it cannot effectively solve safety problems such as needle punching of ternary batteries. A composite separator and its containing Lithium Ion Battery

Method used

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  • Composite separator and lithium ion battery containing the same
  • Composite separator and lithium ion battery containing the same
  • Composite separator and lithium ion battery containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] figure 1 It is a schematic structural diagram of the lithium-ion battery composite separator in Example 1, wherein 11 is the first polyolefin base film, 12 is the first inorganic particle layer and 13 is the non-woven fabric base film. The material of the first polyolefin base film is PE, the thickness is 12 μm, the porosity is 40%, and the pore diameter is 0.04 μm; the material of the first inorganic particle layer is aluminum oxide, and the thickness is 10 μm; the material of the non-woven fabric base film It is PET with a thickness of 15 μm, a porosity of 50%, and a pore size of 1 μm.

[0036] A lithium-ion battery containing the above-mentioned composite diaphragm, comprising a square aluminum case and a positive electrode sheet, a negative electrode sheet, a composite diaphragm and an electrolyte disposed in the aluminum case; the positive electrode material is a ternary material, and the negative electrode material is Graphite, the electrolyte is an organic solve...

Embodiment 2

[0038] figure 2 It is a structural schematic diagram of the lithium-ion battery composite separator of Example 2, wherein 21 is the first inorganic particle layer, 22 is the first polyolefin base film, 23 is the second inorganic particle layer and 24 is the non-woven fabric base film. The material of the first polyolefin base film is PP, the thickness is 16 μm, the porosity is 30%, and the pore diameter is 0.06 μm; the material of the first and second inorganic particle layers is titanium dioxide, and the thickness is 1 μm; the material of the non-woven fabric base film It is PI, the thickness is 10 μm, the porosity is 60%, and the pore size is 2 μm.

[0039] A lithium-ion battery containing the above-mentioned composite separator, comprising a square plastic casing and a positive electrode sheet, a negative electrode sheet, a composite separator and an electrolyte disposed in the plastic casing; the positive electrode material is a ternary material, and the negative electrod...

Embodiment 3

[0041] image 3 It is a schematic structural diagram of the lithium-ion battery composite separator of Example 3, wherein 31 is the first polyolefin base film, 32 is the first inorganic particle layer, 33 is the non-woven fabric base film and 34 is the second inorganic particle layer. The material of the first polyolefin base film is PE, the thickness is 10 μm, the porosity is 50%, and the pore diameter is 0.03 μm; the material of the first and second inorganic particle layers is zirconia, and the thickness is 5 μm; the non-woven fabric base film The material is aramid fiber, the thickness is 20 μm, the porosity is 30%, and the pore diameter is 10 μm.

[0042] A lithium-ion battery containing the above-mentioned composite diaphragm, comprising a square aluminum-plastic film and a positive electrode sheet, a negative electrode sheet, a composite diaphragm and an electrolyte disposed in the aluminum-plastic film; the positive electrode material is a ternary material, and the neg...

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Abstract

The invention discloses a composite separator and a lithium ion battery containing the same. The composite separator comprises at least a polyolefin-based film, an inorganic particle layer and a non-woven base film, wherein the polyolefin-based film has a thickness of 5 to 20[mu]m and a porosity of 30 to 60%, and the inorganic particle layer has a thickness of 1 to 20[mu]m. The composite separatorof the lithium ion battery provided by the invention has the characteristics such as moderate pore size and narrow distribution, high puncture and tensile strength, existence of closed pore temperature, good thermal stability, high temperature resistance, high breakdown voltage, simple manufacturing process and low cost, and has the advantages of good battery consistency, good cycle performance,low self-discharge rate, low short circuit rate and high safety performance.

Description

technical field [0001] The invention relates to the field of manufacturing lithium ion batteries, in particular to a composite diaphragm and a lithium ion battery containing the same. Background technique [0002] Lithium-ion batteries are favored for their high energy density, good cycle performance, and environmental friendliness, and are widely used in consumer electronics, electric vehicles, power tools, and energy storage. As lithium-ion batteries are more and more widely used, higher requirements are placed on the energy density of lithium-ion batteries. Compared with lithium iron phosphate batteries whose energy density is close to the ceiling, ternary batteries will be more popular. However, the safety issue of ternary batteries has always been the focus of social attention and has not been effectively resolved. [0003] The separator is a porous material placed between the positive and negative electrodes of the battery. It is a key inner component in the lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/454
CPCY02E60/10
Inventor 叶茂郭丽媛卢诚
Owner TIANJIN SINOPOLY NEW ENERGY TECH
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