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Manufacturing method of lithium battery composite positive electrode and battery

A composite positive electrode and manufacturing method technology, which is applied in electrode manufacturing, battery electrodes, electrode collector coatings, etc., can solve problems such as uneven mixing, affecting battery performance, and sulfur segregation, so as to simplify the preparation process and avoid sulfur segregation Effect

Active Publication Date: 2018-04-13
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium battery composite positive electrode manufacturing method and the battery, the method solves the problems of uneven mixing in the existing method, and the use of organic solvents (such as NMP) will cause sulfur segregation, affecting battery performance and other problems, can improve Dispersion characteristics of fluorinated carbon and sulfur with conductive agent to improve electrode discharge performance

Method used

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  • Manufacturing method of lithium battery composite positive electrode and battery
  • Manufacturing method of lithium battery composite positive electrode and battery
  • Manufacturing method of lithium battery composite positive electrode and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for manufacturing a lithium battery composite positive electrode, specifically as follows:

[0047] Weigh 28g of carbon fluoride, 28g of elemental sulfur, 6g of conductive carbon black Super P, 5g of Ketjen carbon ECP600JD (model), and 5g of vapor-grown carbon fiber VGCF into a ball mill tank, then add 50g of ethanol into the tank and put it into a diameter 140g of agate grinding balls of different sizes from 3 to 10mm. Ball mill for 3 h at a speed of 300 r / min on a planetary ball mill.

[0048] After stopping the ball milling, weigh and add 100 g of deionized water, and continue ball milling at a speed of 300 r / min for 3 h.

[0049]After stopping the ball milling, weigh and add 53.33g of LA133 binder emulsion (aqueous dispersion of acrylonitrile multi-polymer copolymer) with a concentration of 15%, and continue ball milling at a speed of 300r / min for 14h.

[0050] After stopping the ball milling, add 32g of deionized water to adjust the solid content of the ...

Embodiment 2

[0054] A lithium battery, the positive electrode of the battery adopts the positive electrode sheet prepared in the above embodiment 1, and its assembly is as follows:

[0055] Under dry air conditions with a dew point less than -40°C, the coated positive electrode, Celgard2325 separator, 680mm long × 82mm wide × 0.1mm thick lithium strip negative electrode are assembled by winding the lithium-sulfur battery. The battery case is made of aluminum Plastic composite film seal.

[0056] The electrolyte uses 1mol / L lithium bistrifluoromethanesulfonylimide (LiTFSI) / 1,3-dioxolane (DOL) + ethylene glycol dimethyl ether (DME) (the volume ratio of DOL and DME is 1 :1) / 0.2mol / L lithium nitrate (LiNO 3 ), the electrolyte filling volume is 12g.

[0057] After the battery was injected with liquid, it was left to stand for 48 hours, and then vacuum-sealed for the second time to obtain a lithium battery.

[0058] Battery performance test of the above-mentioned lithium battery: at room temp...

Embodiment 3

[0061] A method for manufacturing a lithium battery composite positive electrode, specifically as follows:

[0062] Weigh 28g of carbon fluoride, 35g of sulfur-carbon composite material (sulfur content 80%), 3g of conductive carbon black Super P, 3g of Ketjen carbon ECP600JD (model), and 3g of vapor-grown carbon fiber VGCF into a ball mill jar, and then Add 60g of ethanol and put 140g of agate grinding balls of different sizes from 3 to 10mm in diameter. Ball mill for 3 h at a speed of 300 r / min on a planetary ball mill.

[0063] After stopping the ball milling, weigh and add 100 g of deionized water, and continue ball milling at a speed of 300 r / min for 3 h.

[0064] After stopping the ball milling, weigh and add 53.33g of LA133 binder emulsion with a concentration of 15%, and continue ball milling at a speed of 300r / min for 14h.

[0065] After stopping the ball milling, add 62g of deionized water to adjust the solid content of the slurry to 23%, and continue ball milling a...

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Abstract

The invention discloses a manufacturing method of a lithium battery composite positive electrode and a battery. The method comprises the following steps of 1) adding fluorinated carbon, a sulfur-containing material and a conductive agent into an alcohol solvent for ball-milling in advance; 2) adding deionized water to dilute paste, and continuing to ball-mill; 3) adding a water-based binding agent, and continuing to ball-mill; 4) adding the deionized water to adjust viscosity of the paste, and continuing to ball-mill; and 5) sieving the paste obtained by ball-mill, coating the paste on an aluminum foil current collector, and drying to remove the solvent to obtain the composite positive electrode. The composite electrode preparation method is further optimized by the method, active materialmixing, conductive mixing and paste preparation in a water-based solvent are completed in one time, sulfur segregation caused by application of an NMP solvent is prevented, the dispersion characteristics of the fluorinated carbon, sulfur and the conductive agent can be improved, and the discharging performance of the electrode is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and relates to a lithium battery composite positive electrode, in particular to a lithium battery composite positive electrode manufacturing method and the battery. Background technique [0002] There are many kinds of lithium batteries with metal lithium as the negative electrode, which have high specific energy. Among them, the lithium primary battery with carbon fluoride as the positive electrode, because its theoretical mass specific energy is close to 2200Wh / kg, the actual energy density can even reach more than 500Wh / kg, and it has stable discharge voltage, low self-discharge rate, and good high-temperature discharge. Features and has a broad market in both military and civilian fields. However, fluorocarbons still have disadvantages such as large volume expansion, high heat generation, and high cost. [0003] Sulfur is another high-capacity lithium battery cathode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/139H01M4/04H01M6/16
CPCH01M4/0404H01M4/139H01M4/1393H01M6/16Y02E60/10
Inventor 郭瑞李永刘雯裴海娟毛亚白清友解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES