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Method for preparing thin thermal battery negative electrode pole piece based on slurry coating method

A technology for negative electrode pole pieces and thermal batteries, which is applied in the field of preparing thin thermal battery negative pole pieces based on the slurry coating method, can solve the problems that the thermal battery pole pieces cannot be thinned, and achieve high utilization of active materials and high electrochemical performance. Improvement and small internal resistance

Inactive Publication Date: 2015-06-03
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a thin thermal battery negative electrode sheet by using thermal battery negative electrode slurry, which solves the problem that the thermal battery electrode sheet cannot be thinned in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of thermal battery negative electrode homogeneous slurry: In a drying room with a humidity 7 h 16 80% of the organic dispersant was mixed according to the proportion, and mechanically stirred at a speed of 1500r / min for 30 minutes to obtain a uniform slurry for the negative electrode of the heated battery; the above proportions are all percentages by mass.

[0024] On the surface-treated graphite paper, a thermal battery negative electrode uniform slurry with a thickness of 50 um was coated at a speed of 45 cm / min, and was cured in a vacuum oven at 100 ° C for 30 min; Press down for 4 minutes to obtain a thin thermal battery negative electrode sheet; the thickness of the negative electrode sheet is 25um.

Embodiment 2

[0026] Preparation of homogeneous slurry for thermal battery negative electrode: In a glove box, lithium aluminum alloy Li-Al20%, PTFE emulsion binder 0.2% and C 2 h 6 O organic dispersant 79.8% was mixed according to the proportion, and the speed of 300r / min was magnetically stirred for 24 hours to obtain a uniform slurry for the negative electrode of the heated battery; the above proportions are all percentages by mass.

[0027] Then, on the surface-treated metal foil, coat a 100um-thick thermal battery negative electrode uniform slurry at a speed of 20cm / min, and dry it in a vacuum oven at 25°C for 24h; Press for 30 seconds to obtain a thin thermal battery negative pole piece; the thickness of the negative pole piece is 80um.

Embodiment 3

[0029] Preparation of homogeneous slurry for negative electrode of thermal battery: In a drying room with humidity 4 h 7 25% of the NO organic dispersant was mixed according to the ratio, and stirred magnetically at a speed of 1000r / min for 2 hours to obtain a uniform slurry for the negative electrode of the heated battery; the above ratios are all percentages by mass.

[0030] Then, on the surface-treated metal sheet, coat a 400 um thick thermal battery negative electrode uniform slurry at a speed of 5 cm / min, and dry it in a vacuum oven at 60 ° C for 10 h to cure; then prepare the sample under a pressure of 2 Mpa Press for 5 minutes to obtain a thin thermal battery negative pole piece; the thickness of the negative pole piece is 350um.

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Abstract

The invention belongs to the field of battery manufacturing, and relates to a method for preparing a thin thermal battery negative electrode pole piece based on a slurry coating method. The method comprises the following steps: mixing a thermal battery negative electrode powder material, an adhesive and an organic dispersing agent so as to form uniform slurry, coating the slurry on a conductive substrate, molding, drying, and curing, thereby obtaining the thin thermal battery negative electrode pole piece. Compared with a conventional powder tabletting forming process, the method is relatively low in cost, simple in process and applicable to large-scale industrial product, is innovative in the small-size / thinning field of thermal batteries, and has very high values for promoting development of the national defense industry, the thickness of the thin thermal battery negative electrode pole piece prepared by using the method can be reduced by 1 / 3-1 / 2, and the thickness of the thin thermal battery negative electrode pole piece can be adjusted within dozens of to hundreds of micrometers.

Description

technical field [0001] The invention belongs to the field of battery manufacturing, and in particular relates to a method for preparing a thin thermal battery negative electrode sheet based on a slurry coating method. Background technique [0002] The thermal battery is a primary reserve battery, which has the advantages of high power, large output current, long storage time and good environmental adaptability. It is the most widely used reserve battery in military equipment and the largest amount of equipment; Preparation of powder tableting process, that is: evenly sprinkle electrode powder material on the conductive substrate, and then apply pressure to shape; due to the poor self-supporting property of the powder, the pole piece cannot be made very thin, and the large diameter pole piece cannot be formed. These have become bottlenecks in the miniaturization of thermal batteries. Therefore, it is of great significance to the national defense industry to study the micro / t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/08
Inventor 邓亚锋原勇强魏华李科兰伟崔益秀
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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