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Lithium cell utilizing foamed nickel material as current-collecting body and producing method thereof

A battery electrode, lithium battery technology, applied in the direction of primary battery electrode, electrode manufacturing, electrode carrier/current collector, etc., can solve the problems of voltage hysteresis, early failure, etc., to improve safety performance, facilitate processing required size, chemical Stability-enhancing effect

Inactive Publication Date: 2007-06-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lithium battery has the above advantages, it has limited the further expansion of its application range due to its safety, voltage hysteresis, premature failure and other issues.
Among them, the safety performance of the battery under abuse is the most prominent. At present, the commonly used solutions include using the weak link of the battery, PTC thermistor current limiting, diode reverse current blocking and increasing current limiting output design, but none of them are very effective. Good solution to lithium battery safety and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment one. Ultrasonic method

[0019] 1. The steps of the method include:

[0020] Ingredients: Weigh the active material acetylene black 87.5~97.6, electrolytic copper powder 0.1~3.0, polytetrafluoroethylene 2.3~9.5 according to the mass percentage, first mix the powder evenly, then add 150~550ml distilled water and 500-950ml of ethanol is stirred evenly with a stirrer to make a slurry-like mixture of active substances.

[0021] Filling: Pour the muddy active substance mixture into the ultrasonic cleaning machine, use ultrasonic vibration to make the active substance enter the pores of the foamed nickel material, and use ultrasonic vibration for 0.5 to 3 hours to make 0.1 to 0.8 grams of active substance per square centimeter of battery electrodes.

[0022] Drying: put the battery electrode with the active material powder into the drying tunnel of the oven to dry it, so that it can be heated evenly to make the dried battery electrode. When drying, the drying te...

Embodiment 2

[0029] Embodiment 2. Coating method

[0030] 1. The steps of the method include:

[0031] Ingredients: Weigh active material acetylene black 87.5~97.6, electrolytic copper powder 0.1~3.0, polytetrafluoroethylene 2.3~9.5 according to mass percentage, dry and powder evenly, then add 75~330ml of distilled water to 100g of the aforementioned active material mixture and 360-750ml of ethanol, and stir evenly with a stirrer to make a slurry-like active substance mixture.

[0032] Filling: Evenly coat the slurry-like active material mixture in the pores and surface of the foamed nickel material, and the amount of active material added is 0.1-0.8 grams of active material per square centimeter.

[0033] Drying: Put the foamed nickel electrode with active material powder into the drying tunnel of the oven to dry, so that it can be heated evenly to make a dried pole piece. When drying, the drying temperature is 110±5°C, and the drying time is at least 4 hours.

[0034] Press forming: t...

Embodiment 3

[0040] Embodiment three. rolling method

[0041] 1. The steps of the method include:

[0042] Ingredients: Weigh the active material acetylene black 87.5~97.6, electrolytic copper powder 0.1~3.0, polytetrafluoroethylene 2.3~9.5 according to the mass percentage, mix the powder evenly, then add 60~180ml distilled water and 230-650ml of ethanol, stirred evenly with a stirrer, to make a paste-like active substance mixture.

[0043] Drying of the active substance mixture: put the stainless steel square pan with the evenly mixed active substance mixture in an oven to dry, so that it is evenly heated to prepare the dried active substance mixture. When drying, the drying temperature is 110±5°C, and the drying time is at least 4 hours.

[0044] Soaking: Add isopropanol at 50±10°C to the dry active substance mixture, soak for 10 minutes and pour out excess isopropanol.

[0045] Membrane rolling: put the thoroughly soaked active material mixture into a double-roll mill, and roll it in...

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Abstract

The present invention is lithium cell with foamed nickel material as current collector and its making process. This kind of lithium cell is obtained through the process including ultrasonic wave treatment, coating, and rolling or negative pressure adsorption to fill active matter, copper powder, PTFE emulsion, distilled water and alcohol into foamed nickel electrode. The lithium cell making process includes main steps of compounding material, filling, drying, pressurizing, etc. The present invention has obviously lowered electrochemical polarization of lithium cell, improved electron conducting path of electrode, improved heavy load work capacity, low temperature performance, lagging characteristic, etc of cell, and raised safety performance.

Description

technical field [0001] The invention is a preparation method of a lithium battery electrode using a foamed nickel material as a current collector. Background technique [0002] Lithium battery is currently the electrochemical system battery with the highest practical specific energy. Its high voltage, wide operating temperature range, long service life and other advantages make it an irreplaceable power source for instruments and other equipment. Although lithium batteries have the above-mentioned advantages, their application range is limited due to problems such as safety, voltage hysteresis, and premature failure. Among them, the safety performance of the battery under abuse is the most prominent. At present, the commonly used solutions include using the weak link of the battery, PTC thermistor current limiting, diode reverse current blocking and increasing current limiting output design, but none of them are very effective. Solve the defects such as lithium battery safe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/04H01M4/08
CPCY02E60/12
Inventor 王圣平吴金平周成刚杨问华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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