Polymer lithium ion battery and diaphragm thereof

A technology of lithium-ion batteries and polymers, applied in secondary batteries, battery components, circuits, etc., can solve problems such as battery heating, battery short circuit, smoke, etc., achieve high safety performance and mechanical properties, and solve deformation problems , the effect of small deformation

Active Publication Date: 2012-07-25
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the diaphragm shrinks, melts, oxidizes, and punctures, it will cause an internal short circuit in the battery, resulting in safety accidents such as heating, smoking, and even explosion and fire in the battery.
[0004] Usually polymer lithium-ion batteries are packaged in aluminum-plastic bags. As people's requirements for the energy density of batteries are getting higher and higher, many battery manufacturers are gradually adopting negative electrode materials with high expansion rates and improving the capacity of the winding process. , which causes the deformation of the battery to become particularly serious, and also has a very serious impact on the safety and reliability of the battery

Method used

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  • Polymer lithium ion battery and diaphragm thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of positive electrode sheet:

[0035] Lithium cobaltate (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) are uniformly mixed at a mass ratio of 96:2.0:2.0 to make a lithium-ion battery with a certain viscosity Positive electrode slurry, coating the slurry on the current collector aluminum foil, drying at 85°C and then cold pressing; then trimming, cutting into pieces, slitting, and drying at 85°C under vacuum for 4 hours after slitting , Weld the tabs to make the positive electrode sheet of lithium-ion battery.

[0036] Preparation of negative electrode sheet:

[0037] Make slurry with graphite and conductive agent superconducting carbon (Super-P), thickener sodium carboxymethyl cellulose (CMC), and binder styrene-butadiene rubber (SBR) at a mass ratio of 96.5:1.0:1.0:1.5 , coated on the current collector copper foil and dried at 85°C, trimmed, cut into pieces, slitting, and ...

Embodiment 2

[0055] Different from Example 1 is the preparation of diaphragm:

[0056] The porous substrate of the diaphragm is made of 16um thick polypropylene microporous film;

[0057] Preparation of inorganic ceramic glue for diaphragm coating:

[0058] The composition of the inorganic ceramic glue is as follows: 35 parts of inorganic silica nano-powder whose surface has been modified, 10 parts of butadiene-acrylonitrile polymer, and 55 parts of dimethyl carbonate solvent.

[0059] Preparation steps:

[0060] In the first step, add a total of 30Kg of polybutadiene-acrylonitrile polymer and dimethyl carbonate into a double planetary mixer, disperse at 45°C for 3 hours, and the volume of the mixer is 60L;

[0061] In the second step, 16.1Kg of the above-mentioned silica nanopowder is added to the mixer of the first step, dispersed at a high speed for 2 hours at 45°C, and then ball milled with a nano-mill for 1.5 hours. The grinding media used Spherical zirconia beads with a diameter o...

Embodiment 3

[0072] Different from Example 1 is the preparation of diaphragm:

[0073] The porous substrate of the diaphragm is made of 16um thick polyethylene microporous film;

[0074] Preparation of inorganic ceramic glue for diaphragm coating:

[0075] The composition of the inorganic ceramic glue is as follows: a mixture of 40 parts of titanium dioxide nanopowder and barium titanate micropowder (the mass ratio of the two is 1:1), 8 parts of vinylidene fluoride-hexafluoropropylene polymer and polyacrylonitrile (the mass ratio of the two is 1:2), 52 parts of cyclohexanone solvent.

[0076] Preparation steps:

[0077] In the first step, add a total of 30Kg of the above-mentioned polymer and organic solvent into a double planetary mixer, disperse at 45°C for 3 hours, and the volume of the mixer is 60L;

[0078] In the second step, 20Kg of the above-mentioned mixture of titanium dioxide nanopowder and barium titanate micropowder is added to the mixer in the first step, dispersed at a hi...

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Abstract

The invention belongs to the technical field of polymer lithium ion batteries, in particular to a diaphragm for the polymer lithium ion battery. The diaphragm comprises a multihole base material, wherein an inorganic substance coating layer and an organic substance coating layer are coated on at least one surface of the multihole base material; and the organic substance coating layer is in island-type and / or linear distribution and coated on the surface of the multihole base material and / or the inorganic substance coating layer. Compared with the prior art, due to the inorganic substance coating layer, the diaphragm can keep relatively high heat stability and mechanical performance, so that the lithium ion battery has high safety performance; the organic substance coating layer has high imbibition swelling capacity, and an interface has high stability, so that the manufactured lithium ion battery has perfect mechanical performance; due to the distribution characteristic of the organic substance coating layer, spaces are provided for charging and discharging processes of a pole piece and a circulation process; and the problem of deformation of the polymer lithium ion battery is well solved. Furthermore, the invention also discloses a polymer lithium ion batter with the diaphragm.

Description

technical field [0001] The invention belongs to the technical field of polymer lithium-ion batteries, and in particular relates to a polymer lithium-ion battery with excellent cycle performance, safety performance and mechanical performance and a diaphragm thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers and various A variety of electric vehicles, even aerospace, wind and solar energy storage equipment. [0003] While polymer lithium-ion batteries are widely used, there are also certain safety hazards. So far, there have been many accidents such as mobile phone and laptop battery explosions appearing in the newspapers, which makes people question the safety performance of lithium-ion batteries. The lithium-ion battery separator is an important part to ensure the safety performance of the battery, especially under some special conditions, such as high-temperature baking, acupuncture, overcharging or foreign ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/414H01M50/417H01M50/42H01M50/426H01M50/429H01M50/434H01M50/451H01M50/457H01M50/489H01M50/491
CPCY02E60/12Y02E60/122H01M2/145H01M10/0565H01M2/1646H01M2/1653H01M2/1686H01M10/0525Y02E60/10H01M50/403H01M50/417H01M50/457H01M50/491H01M50/434H01M50/42H01M50/429H01M50/451H01M50/414H01M50/489H01M50/426
Inventor 张盛武陶兴华周德文许瑞张柏清
Owner NINGDE AMPEREX TECH
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