Unlock instant, AI-driven research and patent intelligence for your innovation.

Making method for rechargeable 3V button type lithium battery

A manufacturing method and technology of button battery, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of no capacity advantage, large self-discharge, unable to meet the requirements of backup power supply, etc., to achieve low cost, reduce battery cost, simple method effect

Inactive Publication Date: 2015-06-10
天津赫维科技有限公司
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This 3V battery has the advantages of long cycle life, low cost, and environmental protection. However, this 3V battery has a relatively large self-discharge problem and cannot meet the requirements of the backup power supply for the data memory of the electronic circuit board.
Moreover, the reversible specific capacity of the graphite negative electrode is about 320-360 mA hours / g, which is far lower than the reversible specific capacity of the lithium-aluminum alloy negative electrode of 800-1000 mA hours / g, making the 3V button battery composed of lithium iron phosphate / graphite system Compared with the existing 3V batteries using lithiated manganese dioxide as the positive electrode active material and lithium aluminum alloy as the negative electrode active material, there is no capacity advantage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 96g of battery-grade lithium iron phosphate powder, 2g of flake graphite powder, 1g of conductive carbon black, and 2g of 50% PTFE emulsion into a mortar, grind and stir evenly, then put it in a 110°C blast oven and dry for 2 hours Take 0.25g of the mixture and place it on a tablet press to form a Φ8.8mm thickness 0.97mm disc, then put it in a 120°C, -0.1MPa vacuum oven, dry for 3 hours, cool down, and use it as a positive electrode sheet. Take 12g of 300-mesh aluminum powder and 0.63g of 200-mesh nickel powder into a mortar and mix and grind them evenly. Take 0.126g of the mixture and press it into a Φ9.8mm thickness 0.59mm disc on a tablet press, which will be used as a negative electrode sheet. Take a polypropylene diaphragm with a thickness of 0.1mm and punch it into a Φ10.8mm disc for use as a diaphragm. Put the positive sheet, separator sheet, negative sheet, CR1220 battery positive shell, CR1220 battery negative shell, and the corresponding sealing mold into a...

Embodiment 2

[0016] Put 96g of battery-grade lithium iron phosphate powder, 2g of flake graphite powder, 1g of conductive carbon black, and 2g of 50% PTFE emulsion into a mortar, grind and stir evenly, then put it in a 110°C blast oven and dry for 2 hours Take 0.25g of the mixture and place it on a tablet press to form a Φ8.8mm thickness 0.97mm disc, then put it in a 120°C, -0.1MPa vacuum oven, dry for 3 hours, cool down, and use it as a positive electrode sheet. Take 14.4g 300-mesh aluminum powder and 0.74g 200-mesh nickel powder into a mortar and mix, and grind uniformly. Take 0.152g of the mixture and press it into a Φ9.8mm thick 0.64mm disc on a tablet press, which is used as a negative electrode sheet. Take a polypropylene diaphragm with a thickness of 0.1mm and punch it into a Φ10.8mm disc for use as a diaphragm. Put the positive sheet, separator sheet, negative sheet, CR1220 battery positive shell, CR1220 battery negative shell, and the corresponding sealing mold into a dry environme...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a making method for a rechargeable 3V button type lithium battery with lithium iron phosphate as the anode and aluminum as the cathode. The method includes: mixing lithium iron phosphate, graphite, carbon black and polytetrafluoroethylene evenly, conducting drying, and then pressing the mixture into a wafers as cathode of lithium iron phosphate; mixing aluminum powder accounting for 50%-60% of the mass of the lithium iron phosphate with nickel powder according to a mass ratio of 95:5 uniformly and pressing the mixture into a wafer to serve as the cathode; adding 0.1mm polypropylene diaphragm and conducting punching into a wafer; in an environment with relative humidity of less than or equal to 2%, assembling a button battery, adding 1MLiFP6 into an EC / DMC (50:50) electrolyte solution, and performing sealing at a pressure of 3MPa; conducting 0.1C charging on the battery to 3.5V, and then keeping a constant pressure of 3.5V to conduct charging for 12 totally, thus obtaining the 3V rechargeable button type battery. The method provided by the invention has the advantages of simplicity, low cost, high capacity, strong deep discharge capability, and long cycle life, thus being suitable for large-scale industrial production.

Description

Technical field [0001] The invention discloses a manufacturing method of a rechargeable 3V button-type lithium battery using lithium iron phosphate as a positive electrode and aluminum as a negative electrode, which belongs to the innovation of chemical energy storage technology. Background technique [0002] Rechargeable 3V button lithium battery is an important type of battery, mainly used in electronic circuit boards as a backup power source for data memory, and widely used in notebook computers, mobile phones, GPS navigators and other products. At present, this kind of battery mainly uses lithiated manganese dioxide as the positive electrode active material and lithium aluminum alloy as the negative electrode active material. Its advantages are high capacity and low self-discharge, but it also has disadvantages such as short service life, poor deep discharge capability and high cost. . The development trend of miniaturization and maintenance-free of electronic products urgen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/38H01M4/58
CPCY02E60/10
Inventor 郝德利
Owner 天津赫维科技有限公司