Lithium ion polymer cell

A polymer, lithium ion technology, applied in battery electrodes, secondary batteries, battery pack components, etc., can solve the problems of large thickness of positive and negative plates, incomplete DBP removal, poor ductility, etc., and achieve low cost , The effect of using a wide temperature range and a simple production process

Inactive Publication Date: 2003-03-05
SHIHLIEN APEX HUAIAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of lithium polymer battery has the following disadvantages: 1. Since the positive and negative electrode active material layers need to be made into self-supporting films, the thickness of the positive and negative electrode sheets is relatively large, the ductility is not good, the battery volume is large, and the capacity density is not high ; 2. Due to the addition of plasticizer DBP substances, the entire battery needs to be extracted to remove DBP plasticizers, so there are problems such as complex process, high cost, and incomplete removal of DBP; 3. Use mesh collectors , which is expensive, which increases the cost of the battery

Method used

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Embodiment 1

[0022] In parts by weight, take 2 parts of polyvinylidene fluoride, 2 parts of modified polydiene, 96 parts of carbon powder, 90 parts of N-methylpyrrolidone in a stainless steel tank after stirring and mixing with a high-speed mixer to form a uniform slurry, It is coated on copper foil and dried in an oven at 100°C to 200°C to obtain a negative electrode sheet, which is cut into required shapes.

Embodiment 2

[0024] In parts by weight, take 2 parts of polyvinylidene fluoride, 1 part of polyacrylate, 7 parts of conductive carbon black, 90 parts of lithium cobalt oxide, 40 parts of N-methylpyrrolidone in a stainless steel barrel and mixed with a high-speed mixer to obtain a uniform The slurry is coated on aluminum foil, and dried in an oven at 80°C to 200°C to obtain a positive electrode sheet, which is cut into the required shape.

Embodiment 3

[0026] In parts by weight, 1 part of polyacrylate, 1 part of modified polyethylene, 6 parts of conductive carbon black, 92 parts of lithium cobaltate, and 35 parts of N-methylpyrrolidone were mixed in a stainless steel bucket with a high-speed mixer to obtain The uniform slurry is coated on aluminum foil and dried in an oven at 100°C to 210°C to obtain a positive electrode sheet, which is then cut into the required size.

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Abstract

This invention relates to Li ionic polymer cell containing positive and negative pole pieces and isolation film in which the positive and negative pole piece, are applied with foil collector. Adhesive is any one of the following three or two of the three mixed according to any proportino (a) PVDF (b) modified PA or PA (c) modifier PE or Polydiene. Advantages: high volume density, long circular life time, small internal resistance, broad temperature sphere, fine high multiplying discharging ability, low senf discharge.

Description

technical field [0001] The present invention relates to a lithium ion polymer battery. Background technique [0002] The lithium-ion polymer battery of Bellcore technology based on USP5296318, the positive and negative electrodes use copper mesh and aluminum mesh as the current collector, and the positive and negative electrode active material layers on the current collector are used. The copolymer of vinylidene fluoride and hexafluoropropylene, that is, the copolymer of VDF and HFP, this type of adhesive has good self-adhesion, but the adhesion to copper foil or aluminum foil is very poor. Therefore, the lithium polymer battery uses copper mesh and aluminum mesh as the current collector, and the adhesive realizes self-adhesion through its meshes and simultaneously clamps the copper mesh or aluminum mesh to become the positive electrode and the negative electrode. In order to achieve self-adhesion of the adhesive, the process requires hot rolling or hot pressing, and at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M4/62H01M4/64H01M10/0525H01M10/0565
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 潘杰民
Owner SHIHLIEN APEX HUAIAN TECH CO LTD
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