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Pole pieces of lithium battery of aqueous-oily active material electrode and method for producing pole pieces

An active material, lithium battery technology, used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, battery electrodes, etc., can solve the impact of lithium battery performance and life, impact strength, flexibility, tensile strength and elongation The decline of mechanical properties , relative molecular weight decline and other issues, to reduce the internal resistance of the battery and product manufacturing costs, improve social and economic benefits, and improve the effect of charging and discharging rates.

Inactive Publication Date: 2012-04-04
江苏中能锂电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the adhesive is a synthetic polymer material, its most fatal shortcoming is aging; the performance of the material will deteriorate at all stages of processing, storage and use, such as relative molecular weight decline, embrittlement and surface cracking, and more serious It is a significant decrease in mechanical properties such as impact strength, flexibility, tensile strength and elongation, which affects the performance and life of lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A lithium battery with an amphoteric active material electrode, comprising a positive electrode sheet and a negative electrode sheet, the present invention is characterized in that one side of the positive electrode sheet and the negative electrode sheet is coated with an A surface coating that binds battery active materials, and the A surface coating It is a battery active material, a water-based binder and an antioxidant, the water-based binder includes polytetrafluoroethylene or styrene-butadiene latex, and the weight ratio of the water-based binder to the antioxidant is 100:1.6; the other side of the positive and negative plates Coating the B-side coating that binds the battery active material, the B-side coating is the battery active material and an oily binder, and the oily binder is polyvinylidene fluoride.

[0048] In this embodiment, the material of the positive electrode sheet is a lithium iron phosphate battery.

[0049] In the present embodiment, the steps f...

Embodiment 2

[0069] In the present embodiment, the steps for producing lithium iron phosphate battery are as follows:

[0070] (1) Take thiourea (CH 4 N 2 S) dissolved in deionized water at a concentration of 1.8%;

[0071] (2) Take the transition metal compound (C 5 h 5 ) 2 Fe was dissolved in deionized water at a concentration of 5.4%;

[0072] (3) Mix (1) and (2) according to the weight ratio of 1:100, the speed of the mixer is 17 rpm, and stir for 35 minutes to make an antioxidant;

[0073] (4) Store the fully and evenly mixed antioxidants at room temperature in a dark and sealed place for 7 days before use;

[0074] (5) Raw material ratio:

[0075] The positive electrode material includes 88% lithium iron phosphate material, 8% conductive agent carbon nanotubes, 2% oily binder and 2% dispersant NMP or 2% water-based binder SBR, the lithium iron phosphate material The particle diameter of the conductive agent carbon nanotube is D50μm, the particle diameter of the conductive a...

Embodiment 3

[0089] The steps for producing lithium iron phosphate batteries are as follows:

[0090] (1) Take thiourea (CH 4 N 2 S) dissolved in deionized water at a concentration of 1.5%;

[0091] (2) Take the transition metal compound (C 5 h 5 ) 2 Fe is dissolved in deionized water at a concentration of 4.5%;

[0092] (3) Mix (1) and (2) according to the weight ratio of 1:100, the speed of the mixer is 15 rpm, and stir for 32 minutes to make an antioxidant;

[0093] (4) Store the fully and evenly mixed antioxidants at room temperature in a dark and airtight place for 6.5 days before use;

[0094] (5) Raw material ratio:

[0095] The positive electrode material includes 84% ​​lithium iron phosphate material, 9% conductive agent carbon nanotube, 4% oily binder and 3% dispersant NMP or 3% water-based binder SBR, the lithium iron phosphate material The particle diameter of the conductive agent carbon nanotube is D30nm, and the positive electrode baseband is aluminum foil;

[0096...

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Abstract

The invention relates to a lithium battery of an aqueous-oily active material electrode and a method for producing the lithium battery. The lithium battery comprises a cathode piece and an anode piece. The lithium battery is characterized in that: an A-surface coating to which a battery active material is adhered is coated on one surface of the cathode and anode pieces; the A-surface coating comprises the battery active material, an aqueous adhesive and an antioxidant; the aqueous adhesive comprises polytetrafluoroethylene or butylbenzene latex; the weight ratio of the aqueous adhesive to the antioxidant is 100:1.6 to 100:2.0; a B-surface coating to which the battery active material is adhered is coated on the other surface of the cathode and anode pieces; the A-surface coating comprises the battery active material and an oily adhesive; and the oily adhesive is polyvinylidene fluoride. The invention has the advantages that: on the premise of no reduction of the performance (such as the specific capacity and cyclicity of the battery) of the conventional universal technical products, the using safety of aqueous-oily active material battery products is greatly improved; the charge multiplying power and discharge multiplying power of the products are improved; the internal resistance of the battery and the manufacturing cost of the products are reduced; and the social benefit and economic benefit of lithium battery products are further improved.

Description

technical field [0001] The invention relates to a lithium battery pole piece of an amphoteric active material electrode and a production method thereof. Background technique [0002] At present, lithium-ion battery products all use a single oily binder as the battery positive and negative electrode active material binder to make oily active material battery pole pieces. Since the adhesive is synthesized from a polymer material, its most fatal shortcoming is aging; the performance of the material will deteriorate at all stages of processing, storage and use, such as relative molecular weight decline, embrittlement and surface cracking, and more serious It is a significant decrease in mechanical properties such as impact strength, flexibility, tensile strength and elongation, thereby affecting the performance and life of lithium batteries. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/1397H01M4/1391H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 白科蔡正英吴钢张斌
Owner 江苏中能锂电科技有限公司
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