Safe lithium ion battery with good cyclic performance

A technology for ion batteries and safe lithium, which is applied in the direction of secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of contact short circuit, scratches or punctures of positive and negative electrodes, and achieve the purpose of suppressing pulverization and improving retention Electrode stabilization and improvement of cycle performance

Inactive Publication Date: 2014-02-26
JIANGSU TENPOWER LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion batteries are also accompanied by safety issues. For example, there are sometimes many bumps with a height of a few microns on the surface of the positive and negative electrodes of the battery. Scratches or punctures occur on the diaphragm between the positive and negative pole pieces, causing a short circuit between the positive and negative pole pieces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The present invention will be described in detail below by way of examples.

[0022] Mix 10 parts of polymer polyvinylidene fluoride and 20 parts of solvent N-methylpyrrolidone and stir the solution at 60°C, add 8 parts of aluminum oxide with an average diameter of 2 μm and 5 parts of volatile additive n-butanol , high-speed stirring to disperse the flame retardant and volatile additives evenly. The coating solution was coated on the upper and lower surfaces of the positive electrode and the negative electrode by coating, and the coating thickness was 8 μm. The pole piece was baked in a vacuum oven at 95° C. for 2 hours to remove the N-methylpyrrolidone solvent and volatile additives to obtain a polymer carrier coating with a thickness of 5 μm. The weight ratio of aluminum oxide in the polymer washcoat is 45%. The polyethylene separator, the positive electrode sheet and the negative electrode sheet are stacked or wound into a battery core in the order of the separator...

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PUM

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Abstract

The invention discloses a safe lithium ion battery with a good cyclic performance. The safe lithium ion battery comprises a positive pole piece, a negative pole piece, and a diaphragm and electrolyte arranged between the positive pole piece and the negative pole piece; polymer carrier coatings are coated on the surfaces of the positive pole piece and the negative pole piece; a negative pole is made of a carbon and tin nano fiber composite thin film material. According to the safe lithium ion battery with good cyclic performance, the pulverization, the cracking and the reunion of pole materials are inhibited greatly so that the cyclic performance of pole materials can be improved and the stability of the poles can be kept; the negative pole material with good reversible specific capacity and cyclic performance is obtained; the separation is generated by the polymer carrier coatings so as to prevent a positive pole and the negative pole from being contacted to cause short circuit.

Description

technical field [0001] The invention relates to batteries, in particular to a safe lithium-ion battery with good cycle performance. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life. They have been widely used in portable electronic and electrical power supplies, such as digital electrical appliances batteries, mobile phone batteries, etc. Traditional fields of application. With the rapid development of industries such as aerospace, transportation, communication and information, the specific energy density of lithium-ion batteries has become increasingly important in high-tech fields such as aerospace space technology, microelectronic equipment for national defense, electric vehicles, mobile communication products, and backup power supplies for disaster prevention and mitigation equipment. Therefore, it is one of the impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62H01M4/66H01M4/133H01M4/1393
CPCY02E60/122H01M4/0404H01M4/362H01M4/587H01M4/62H01M4/667H01M10/0525H01M50/449H01M50/46Y02E60/10
Inventor 陈璇沈春平钱国珠黄满湘秦丽苏乐乐
Owner JIANGSU TENPOWER LITHIUM
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