Ceramic-coated diaphragm for lithium-ion battery and preparation method of ceramic-coated diaphragm

A lithium-ion battery and ceramic coating technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of insufficient and uniform coverage of the diaphragm surface, large particles, and low gravure coating accuracy, and achieve thermal stability and Strong electrochemical stability, reducing potential difference, ensuring fast conduction effect

Active Publication Date: 2017-05-31
ZHEJIANG NARADA POWER SOURCE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general ceramic powder has large particles, which cannot fully and evenly cover the surface of the diaphragm during coating, and the gravure coating accuracy is generally small

Method used

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  • Ceramic-coated diaphragm for lithium-ion battery and preparation method of ceramic-coated diaphragm
  • Ceramic-coated diaphragm for lithium-ion battery and preparation method of ceramic-coated diaphragm
  • Ceramic-coated diaphragm for lithium-ion battery and preparation method of ceramic-coated diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step (1): Prepare a mixed solution of alumina ceramic powder, sodium hydroxide, and deionized water at a ratio of 1:1:16 and stir evenly. The uniformly stirred solution was charged into a hydrothermal reaction kettle, and reacted at 130° C. for 30 minutes. After the reaction is finished and cooled, the solution is filtered and washed with deionized water to obtain the treated ceramic powder, which is dried at 90°C for use.

[0020] Step (2): Mix alumina ceramic powder, polyvinylidene fluoride binder and N'N dimethylpyrrolidone solvent in proportion (mass ratio of ceramic to binder is 3:1, mass ratio of solid to solvent is 1:4 ), placed under normal temperature and mechanically stirred for 6 to 10 hours to obtain a uniform ceramic coating mixture;

[0021] Step (3): Draw a certain amount of ceramic coating mixture with a syringe, put it into an electrostatic spray device, clamp the needle of the syringe with an external power supply, and then flatten and fix the lithium...

Embodiment 2

[0023] Step (1): Prepare a mixed solution of alumina ceramic powder, sodium hydroxide, and deionized water at a ratio of 1:1:16 and stir evenly. The uniformly stirred solution was charged into a hydrothermal reaction kettle, and reacted at 130° C. for 30 minutes. After the reaction is finished and cooled, the solution is filtered and washed with deionized water to obtain the treated ceramic powder, which is dried at 90°C for use.

[0024] Step (2): Mix alumina ceramic powder, polyvinylidene fluoride binder and N'N dimethylpyrrolidone solvent in proportion (mass ratio of ceramic to binder is 4:1, mass ratio of solid to solvent is 1:4 ), placed under normal temperature and mechanically stirred for 6 to 10 hours to obtain a uniform ceramic coating mixture;

[0025] Step (3): Draw a certain amount of ceramic coating mixture with a syringe, put it into an electrostatic spray device, clamp the needle of the syringe with an external power supply, and then flatten and fix the lithium...

Embodiment 3

[0027] Step (1): Prepare a mixed solution of alumina ceramic powder, sodium hydroxide, and deionized water at a ratio of 1:1:16 and stir evenly. The uniformly stirred solution was charged into a hydrothermal reaction kettle, and reacted at 130° C. for 30 minutes. After the reaction is finished and cooled, the solution is filtered and washed with deionized water to obtain the treated ceramic powder, which is dried at 90°C for use.

[0028] Step (2): Mix alumina ceramic powder, polyvinylidene fluoride binder and N'N dimethylpyrrolidone solvent in proportion (mass ratio of ceramic to binder is 5:1, mass ratio of solid to solvent is 1:4 ), placed under normal temperature and mechanically stirred for 6 to 10 hours to obtain a uniform ceramic coating mixture;

[0029] Step (3): Draw a certain amount of ceramic coating mixture with a syringe, put it into an electrostatic spray device, clamp the needle of the syringe with an external power supply, and then flatten and fix the lithium...

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Abstract

The invention discloses a ceramic-coated diaphragm for lithium-ion battery and a preparation method of the ceramic-coated diaphragm. After being treated through hydrothermal reaction of alkali solution, ceramic powder for a commercial lithium-ion battery diaphragm is mixed with binder and solvent, and then sprayed to the diaphragm by an electrostatic spraying method. Compared with the diaphragm before being coated with ceramic powder, the ceramic-coated diaphragm has the advantages of high thermal resistance, high mechanical strength and high liquid-absorbing rate. The ceramic coating sprayed by the electrostatic spraying method is uniform and compact, and plays an important role in improving the liquid-absorbing rate, the thermal resistance and the strength.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a ceramic coating diaphragm for lithium ion batteries and a preparation method thereof. Background technique [0002] As an important part of the lithium-ion battery, the diaphragm plays the role of insulating and blocking the positive and negative electrodes to prevent short circuit. At the same time, the diaphragm is required to have good liquid absorption performance, absorb the electrolyte, and transmit lithium ions. However, extreme conditions such as overcharge, high temperature, and short circuit may occur during the use of lithium-ion batteries. The occurrence of these conditions may damage the diaphragm, causing irreversible mechanical and thermal damage to the battery, and ultimately lead to safety. The problem arises. Commonly used diaphragms are mainly polypropylene diaphragms, polyethylene diaphragms or polypropylene / polyethylene / polypropylene composite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/431Y02E60/10
Inventor 蒋勤虚李小平郭锋周雷军蔡若愚
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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