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Lithium-ion battery composite membrane and preparation method thereof and lithium-ion battery

A technology of lithium-ion batteries and composite diaphragms, applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve problems such as safety accidents, need for improvement, and inability to prevent battery short circuits

Active Publication Date: 2016-09-07
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the polyolefin microporous membrane has the function of closing pores, that is, its microporous structure will self-close at a certain temperature to cut off the current. ℃), the closed cell temperature will not be higher than the melting point temperature, and the closed cell also means that the separator itself has undergone serious shrinkage, which cannot prevent the further occurrence of battery short circuit. Therefore, the closed cell function of the polyolefin separator is in When the internal temperature of the battery is high or the thermal runaway cannot prevent the short circuit from occurring, it will inevitably cause a safety accident
[0003] Therefore, the current lithium-ion battery separator technology still needs to be improved.

Method used

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  • Lithium-ion battery composite membrane and preparation method thereof and lithium-ion battery
  • Lithium-ion battery composite membrane and preparation method thereof and lithium-ion battery
  • Lithium-ion battery composite membrane and preparation method thereof and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 10 parts by weight of paraffin wax with a melting point of 52°C, 3 parts by weight of styrene, 1 part by weight of divinylbenzene, 0.5 parts by weight of chlorinated paraffin, and azobisisobutyronitrile were mixed and heated to 70°C to form an oil phase. After mixing water and polymer surfactant, the temperature was raised to 70° C. to form the water phase. Mix the oil phase and the water phase evenly, and carry out high-speed stirring for 10 minutes, and the stirring speed is not lower than 5000 rpm. Afterwards, nitrogen gas was introduced, and the phase-change microcapsules were obtained after polymerization for 8 hours. The phase-change microcapsule powder can be obtained by freeze-drying the emulsion.

[0059] Mix 10 parts by weight of phase-change microcapsule powder with 100 parts by weight of ethanol, 40 parts by weight of secondary water and 20 parts by weight of ammonia water, add 10 parts by weight of tetraethyl orthosilicate under stirring, stir at room temp...

Embodiment 2

[0062] 10 parts by weight of paraffin wax with a melting point of 25°C, 3 parts by weight of styrene, 1 part by weight of divinylbenzene, 0.5 parts by weight of chlorinated paraffin, and azobisisobutyronitrile were mixed and heated to 70°C to form an oil phase. After mixing water and polymer surfactant, the temperature was raised to 70° C. to form the water phase. Mix the oil phase and the water phase evenly, and carry out high-speed stirring for 10 minutes, and the stirring speed is not lower than 5000 rpm. Afterwards, nitrogen gas was introduced, and the phase-change microcapsules were obtained after polymerization for 8 hours. The phase-change microcapsule powder can be obtained by freeze-drying the emulsion.

[0063] Mix 10 parts by weight of phase-change microcapsule powder with 100 parts by weight of ethanol, 40 parts by weight of secondary water and 20 parts by weight of ammonia water, add 10 parts by weight of tetraethyl orthosilicate under stirring, stir at room temp...

Embodiment 3

[0066] 10 parts by weight of paraffin wax with a melting point of 52°C, 4 parts by weight of styrene, 2 parts by weight of divinylbenzene, 0.5 parts by weight of chlorinated paraffin, and azobisisobutyronitrile were mixed and heated to 70°C to form an oil phase. Mix water and polymeric surfactant and raise the temperature to 70°C as a phase. Mix the oil phase and the water phase evenly, and carry out high-speed stirring for 10 minutes, and the stirring speed is not lower than 5000 rpm. Afterwards, nitrogen gas was introduced, and the phase-change microcapsules were obtained after polymerization for 8 hours. The phase-change microcapsule powder can be obtained by freeze-drying the emulsion.

[0067] Mix 10 parts by weight of phase-change microcapsule powder with 100 parts by weight of ethanol, 40 parts by weight of secondary water and 20 parts by weight of ammonia water, add 10 parts by weight of tetraethyl orthosilicate under stirring, stir at room temperature for 8 hours, an...

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PUM

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Abstract

The invention provides a lithium-ion battery composite membrane and a preparation method thereof and a lithium-ion battery. The lithium-ion battery composite membrane comprises a polyolefin membrane and a protective layer, wherein the protective layer is arranged on at least one surface of the polyolefin membrane; the protective layer is formed by the following composition; the composition contains a composite phase-change microcapsule and a binder; the composite phase-change microcapsule contains a phase-change material and a fire retardant; and inorganic particles are attached to the outer surface of the composite phase-change microcapsule. The lithium-ion battery composite membrane simultaneously has good high temperature resistance, heat buffer performance and flame retardant property; and the use safety of the lithium-ion battery can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a lithium-ion battery composite diaphragm, a preparation method thereof, and a lithium-ion battery. Background technique [0002] The function of the power battery separator is to separate the positive and negative poles of the battery to prevent the two poles from contacting and short-circuiting, and its performance directly affects the safety of the power battery. Polyolefin diaphragm materials with microporous structures, such as polyethylene (PE) and polypropylene (PP) single-layer or multi-layer films, are used in commercial lithium-ion batteries. Because the polyolefin microporous membrane has the function of closing pores, that is, its microporous structure will self-close at a certain temperature to cut off the current. ℃), the closed cell temperature will not be higher than the melting point temperature, and the closed cell also means that the separator itself h...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/42H01M50/403H01M50/417H01M50/443H01M50/446H01M50/449
CPCH01M10/4235H01M50/431H01M50/403Y02E60/10
Inventor 王彦红杨重科李玉军
Owner BEIJING ELECTRIC VEHICLE
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