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Ceramic membrane, preparation method of lithium ion secondary battery and battery

A ceramic diaphragm and diaphragm technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of the influence of the pore structure of the diaphragm substrate, it is difficult to meet industrial production, and the preparation process is complicated, and achieve excellent thermal stability. , easy industrial production, simple and easy-to-control process

Active Publication Date: 2014-09-24
东莞市魔方新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent CN101989651A of Hyundai Automobile Co., Ltd. first mixes and coats ceramic particles with binder, curing agent and initiator, and then conducts chemical crosslinking through thermal polymerization or ultraviolet irradiation in the later stage to obtain ceramic particles and ceramic particles and separators. For ceramic diaphragms with good substrate adhesion, the process of the patented method is relatively complicated, and subsequent thermal polymerization or ultraviolet light irradiation will have a certain impact on the pore structure of the diaphragm substrate
The patent CN103035866A of Xiamen University replaces the existing inorganic ceramic particles by pre-constructing a composite with inorganic substances as the core and acrylate-based polymers as the shell, so as to improve the bonding between the ceramic particles and the diaphragm substrate to avoid the powder drop problem , the complex preparation process of the core-shell structure in the patent method is complicated and difficult to control, and it is difficult to meet the requirements of industrial production

Method used

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  • Ceramic membrane, preparation method of lithium ion secondary battery and battery
  • Ceramic membrane, preparation method of lithium ion secondary battery and battery
  • Ceramic membrane, preparation method of lithium ion secondary battery and battery

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preparation example Construction

[0028] The preparation method of lithium ion secondary battery of the present invention comprises:

[0029] 1) Preparation of positive electrode sheet: Lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride were mixed uniformly in N-methylpyrrolidone solvent to make positive electrode slurry, and then coated on aluminum foil and dried for cooling Pressing, slitting, trimming, and tab welding to make positive plates;

[0030] 2) Preparation of negative electrode sheet: Mix graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene-butadiene rubber in deionized water to make negative electrode slurry, and then coat it on copper foil and bake After drying, carry out cold pressing, slitting, trimming, and tab welding to make negative electrodes;

[0031] 3) Diaphragm substrate: made of PE or PP microporous film;

[0032] 4) Preparation of the ceramic diaphragm: Add the main chain substance into the mixed solvent of ethanol and dei...

Embodiment 1

[0048] Preparation of positive electrode sheet: mix lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride in N-methylpyrrolidone (NMP) solvent at a mass ratio of 96:2.2:1.8 to make positive electrode slurry, and then coat On the aluminum foil and dried at 110°C, cold pressing, slitting, trimming, and tab welding are carried out to make a positive electrode sheet.

[0049] Preparation of negative electrode sheet: Mix graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene-butadiene rubber in deionized water at a mass ratio of 95:1.5:1.5:2.0 to make a negative electrode slurry, and then After being coated on copper foil and dried at 85°C, cold pressing, slitting, trimming, and tab welding are carried out to make negative electrode sheets.

[0050] Diaphragm: Take a polyethylene microporous film with a thickness of 9um as the isolation membrane.

[0051] Preparation of ceramic diaphragm: Add methyl methacrylate (MMA) into a mi...

Embodiment 2

[0054] Preparation of positive electrode sheet: mix lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride in N-methylpyrrolidone (NMP) solvent at a mass ratio of 96:2.2:1.8 to make positive electrode slurry, and then coat On the aluminum foil and dried at 110°C, cold pressing, slitting, trimming, and tab welding are carried out to make a positive electrode sheet.

[0055] Preparation of negative electrode sheet: Mix graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene-butadiene rubber in deionized water at a mass ratio of 95:1.5:1.5:2.0 to make a negative electrode slurry, and then After being coated on copper foil and dried at 85°C, cold pressing, slitting, trimming, and tab welding are carried out to make negative electrode sheets.

[0056] Diaphragm: A polypropylene microporous film with a thickness of 12um is used as a diaphragm.

[0057] Preparation of ceramic diaphragm: Add methyl methacrylate (MMA) into a mixed so...

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Abstract

The invention discloses a ceramic membrane. The ceramic membrane is formed by the following steps: synthesizing dendriform grafted copolymers by acrylate monomers and enol monomers in the presence of an initiator, then adding inorganic ceramic particles, uniformly dispersing to form a mixture, and then coating a single surface or two surfaces of a membrane base material with the mixture. The inorganic ceramic particles are adsorbed onto the copolymers and mutually bonded, so as to form compact ceramic coatings with three-dimensional network structures between the inorganic ceramic particles and between the copolymers, and the ceramic coatings are adsorbed together with the membrane base material by virtue of the copolymers, so that the three-dimensional network structure is formed by the inorganic ceramic particles, the copolymers and the membrane base material. The invention further discloses a preparation method of a lithium ion secondary battery and the battery. The ceramic membrane has the advantages of good thermostability, simplicity in process control and easiness in industrial production, in the process of using the lithium ion battery, the stability of the assembly process is kept, the safety performance of the battery is guaranteed, and the effects of environmental friendliness and energy conservation are achieved.

Description

technical field [0001] The invention relates to a ceramic diaphragm, specifically, a ceramic diaphragm, a method for preparing a lithium-ion secondary battery and battery technology. Background technique [0002] Due to the characteristics of high energy density, high working voltage and light weight, lithium-ion secondary batteries have been widely used in consumer electronics products, such as mobile phones, notebook computers, tablet computers, Bluetooth headsets, MP3, digital cameras and other fields. With the increasingly severe environmental pollution and energy crisis, the use of lithium-ion secondary batteries in power batteries and stationary power stations has become more and more popular, but the safety of lithium-ion secondary batteries has always been the focus of attention. [0003] The diaphragm of the lithium-ion secondary battery is used as the isolation of the positive and negative electrodes, and is sandwiched between the positive and negative electrodes. ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0587H01M10/0525H01M50/403H01M50/406H01M50/434H01M50/443H01M50/489
CPCY02E60/122H01M10/0525H01M10/0587H01M50/403H01M50/446Y02E60/10Y02P70/50
Inventor 蒋中林
Owner 东莞市魔方新能源科技有限公司
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