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Production method of lithium-aluminum alloy negative electrode for button battery

A lithium-aluminum alloy and button battery technology, which is applied to battery electrodes, electrode carriers/collectors, circuits, etc., can solve the problems of short cycle life, bulging electrode surface, electrode pulverization, etc., so as to prolong cycle life and reduce battery life. The effect of softening and inhibiting expansion

Inactive Publication Date: 2015-06-10
天津赫维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the market of this kind of battery is mainly monopolized by Japan's Panasonic and Sanyo, and the number of domestic battery cycles is far below the index of Japanese products. This is mainly due to the poor cycle performance of the negative lithium aluminum alloy.
[0003] The production of lithium-aluminum alloy negative electrode is generally to directly press lithium-aluminum alloy powder containing a certain proportion of lithium into a thin sheet as the negative electrode. The disadvantage of this kind of negative electrode is that the polarization is large, the electrode surface bulges at the end of the cycle, and the electrode pulverization is serious, resulting in cycle failure. short life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] LiMnO 2 , Acetylene black and PTFE powder are mixed according to the ratio of 90:6:4, and pressed into a disc with a thickness of 0.9mm and ￠9mm. After the wafer is vacuum-dried at 45°C for 72 hours, the temperature is lowered, and it is soaked in the electrolyte for more than 72 hours in an environment with a relative humidity of ≤1%.

[0014] Make the area density 150g / m 2 , The foamed nickel with a thickness of 3mm is punched into a disc of ￠8.5mm, and then spot-welded on the negative electrode cover with an inner diameter of ￠8.7mm for use. In an environment with a relative humidity of ≤1%, add 99g of 180-mesh lithium aluminum alloy powder and 5g of battery-grade carbon black into a mortar, grind for 30 minutes to form a uniform black powder, and take 70mg of the black powder and place it inside the negative electrode cover to foam nickel On top, use a polypropylene sheet to scrape repeatedly to make the powder completely enter the gap of the foamed nickel, and th...

Embodiment 2

[0016] LiMnO 2 , Acetylene black and PTFE powder are mixed according to the ratio of 90:6:4, and pressed into a disc with a thickness of 0.9mm and ￠9mm. After the wafer is vacuum-dried at 45°C for 72 hours, the temperature is lowered, and it is soaked in the electrolyte solution for more than 72 hours in an environment with a relative humidity of ≤1%.

[0017] Make the area density 300g / m 2 , The foamed nickel with a thickness of 2mm is punched into a disc of ￠8.5mm, and then spot-welded on the negative electrode cover with an inner diameter of ￠8.7mm for use. In an environment with a relative humidity of ≤1%, add 99g of 300-mesh lithium aluminum alloy powder and 5g of battery-grade carbon black into a mortar, grind for 30 minutes to form a uniform black powder, and take 70mg of the black powder and place it in the negative electrode cover to foam nickel On top, use a polypropylene sheet to scrape repeatedly to make the powder completely enter the gap of the foamed nickel, a...

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Abstract

The invention discloses a production method of a lithium-aluminum alloy negative electrode for a button battery. The negative electrode is composed of foamed nickel, lithium-aluminum alloy powder and a conductive agent. The method comprises the following steps: mixing the lithium-aluminum alloy powder with the conductive agent in proportion, uniformly grinding, filling the foamed nickel in a negative electrode shell with the obtained mixture, and compacting. The negative electrode inhibits expansion caused by the charge and discharge process and reduces the reaction polarization in order to obviously prolong the service life of the battery. The method has the advantages of simple process, low cost, and suitableness for large scale batch production.

Description

technical field [0001] The invention discloses a method for manufacturing a lithium-aluminum alloy negative electrode for a button battery, which belongs to the innovation of chemical energy storage technology. Background technique [0002] Due to the popularity and rapid development of electronic products, the demand for lithium-manganese dioxide rechargeable button batteries is increasing, and the requirements for storage capacity and cycle life are also increasing. At present, the market of this kind of battery is mainly monopolized by Japan's Panasonic and Sanyo, and the number of domestic battery cycles is far below the index of Japanese products. This is mainly due to the poor cycle performance of the negative lithium-aluminum alloy. [0003] The production of lithium-aluminum alloy negative electrode is generally to directly press lithium-aluminum alloy powder containing a certain proportion of lithium into a thin sheet as the negative electrode. The disadvantage of t...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/66
CPCC22C21/00H01M4/1395H01M4/66Y02E60/10
Inventor 郝德利叶丽光
Owner 天津赫维科技有限公司