Lithium ion battery negative pole material capable of improving safety performance and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of limited battery safety performance, reduce the overall thermal runaway, reduce the probability of dendrites piercing the diaphragm, and prevent the battery from overheating.

Active Publication Date: 2013-05-22
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the safety of batteries is mainly improved through the following aspects: optimizing the electrolyte formula, using ceramic diaphragms, and providing safe lithium-ion positive and negative electrode materials; but these methods are limited to improve the safety performance of batteries

Method used

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  • Lithium ion battery negative pole material capable of improving safety performance and preparation method thereof
  • Lithium ion battery negative pole material capable of improving safety performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After the negative pole piece is rolled, the surface of the negative pole is coated with a layer of LiAlO by ultrasonic spraying 2 Film; the steps are as follows: 1) slurry configuration, weigh 100 grams of LiAlO 2 , 10 grams of LA132 adhesive, 2 grams of CMC adhesive, 1 gram of SP conductive agent, 640 grams of double distilled water, configured into a 15% concentration of lithium metaaluminate slurry; 2) coating: the above slurry Use the ultrasonic spray method (the equipment frequency is 500KHz) to coat the surface of the negative pole piece with lithium metaaluminate material, then bake it at 50℃ for 1 hour, and then dry it to obtain LiAlO with a thickness of 2μm. 2 Thin film negative pole piece. The chemical name of LA132 binder and CMC binder is sodium carboxymethyl cellulose, and the conductive agent is Super-P.

Embodiment 2

[0018] The production process of the lithium ion battery provided in this embodiment is the same as the production process commonly used in this field, except that: after the negative pole piece is rolled, a layer of LiAlO is coated on the surface of the negative electrode by ultrasonic spraying. 2 Film; 1) slurry configuration, weigh 100 grams of LiAlO 2 , 5 grams of LA132 adhesive, 2 grams of CMC adhesive, 1 gram of SP conductive agent, 2052 grams of double distilled water, configured into a 5% concentration of lithium metaaluminate slurry; 2) coating: the above slurry Ultrasonic spraying method (the equipment frequency is 1MHz) is used to coat the surface of the negative pole piece with lithium metaaluminate material, and then bake for 2 hours at a temperature of 40℃, and then dry to obtain a LiAlO with a thickness of 1μm on the surface. 2 Thin film negative pole piece.

Embodiment 3

[0020] After the negative pole piece is rolled, a layer of LiAlO2 film is coated on the surface of the negative electrode by ultrasonic spraying; the process is as follows: 1) slurry configuration, weigh 50 grams of LiAlO 2 , 10 grams of LA132 binder, 1 gram of CMC, 1 gram of SP conductive agent, 93 grams of double distilled water, configured into a 40% concentration of lithium metaaluminate slurry; 2) coating: the above slurry is ultrasonic sprayed Method (the device frequency is 1MHz) Coat the surface of the negative pole piece with lithium metaaluminate material, then bake it at a temperature of 80℃ for 2h, and dry it to finally obtain LiAlO with a surface coating thickness of 10μm 2 Thin film negative pole piece.

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Abstract

The invention relates to a preparation method of a lithium ion battery negative pole material capable of improving the safety performance. The method comprises the following steps of: (1) slurry configuration, (2) coating, and (3) roasting and drying. According to the invention, as a negative pole tab is coated with a lithium metaaluminate film, which not only has a good electronic insulation effect, but also can effectively obstruct battery short circuit after a battery diaphragm PP (Polypropylene) or PE (polyethylene) is punctured, and at the same time the lithium metaaluminate has good ionic conductivity, thus increasing the transmission velocity of the lithium ion battery, and reducing the probability that dendritic crystal generated by lithium separation of the lithium ion battery pierces the diaphragm. The composite negative pole tab prepared by the method plays a very important role in improving high-capacity lithium ion batteries.

Description

[0001] In the field of electrochemical technology, the present invention is specific to a method that improves the safety performance of lithium ion batteries and its prepared lithium -ion batteries. Background technique [0002] Lithium iron phosphate battery is a new type of energy storage element developed in recent years, and has been favored by the market for its low price, environmental protection, and long cycle life.At the same time, as the battery energy density continues to increase, the thermal stability of the battery is getting worse and worse, and the battery door incidents of companies such as Sony, Vientiane and other companies continue to occur.The safety and stability of batteries has become a major challenge in the industry.The safety and stability of the battery is mainly caused by the battery caused by the short circuit of the lithium -ion battery caused by the thermal discharge of the battery.At present, the safety of the battery is mainly through the followin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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