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Method for preparing lithium/thionyl chloride battery carbon cathode

A technology of thionyl chloride battery and carbon cathode, which is applied in electrode manufacturing, battery electrode, electrode of primary battery, etc., can solve the problems of safe voltage hysteresis current output capability, decrease of battery current output capability, increase of cathode reaction resistance, etc. Achieve the effect of improving high current discharge capacity, increasing discharge capacity and working voltage, and increasing surface area

Active Publication Date: 2009-04-22
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primary power supply used by missiles, satellites and other aircraft not only requires high specific energy, but also needs to have a large output power, that is, the battery must have a certain pulse discharge capability and high-rate discharge performance, but the conventional Li / SOCl 2 During the discharge process of the battery, the surface of the carbon cathode gradually loses its activity due to the deposition of LiCl, and the resistance of the cathode reaction increases, resulting in a decrease in the current output capacity of the battery. There are safety issues, voltage hysteresis and current output capacity issues. If you want to use Li / SOCl 2 The battery replaces the current main power supply zinc-silver battery, and it needs to further improve or solve the above problems. The study found that Li / SOCl 2 The battery can effectively increase the Li / SOCl by improving the quality of the carbon cathode 2 battery performance

Method used

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  • Method for preparing lithium/thionyl chloride battery carbon cathode
  • Method for preparing lithium/thionyl chloride battery carbon cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) and powder

[0021] Acetylene carbon black (battery grade): 0.88g

[0022] PTFE emulsion (60% aqueous solution): 0.2ml

[0023] Isopropanol (analytical pure): 8ml

[0024] Cobalt phthalocyanine complex: 0.042g (4% by mass)

[0025] Weigh the polytetrafluoroethylene emulsion according to the proportion and put it into an agate crucible, then weigh acetylene carbon black and cobalt phthalocyanine into it, add 8ml of isopropanol as a solvent, stir and mix evenly to form a carbon cathode paste.

[0026] (2) Roll forming

[0027] Put the uniformly mixed cathode paste into a roller machine for multiple rolling to form a film with a thickness of 1-2mm, and cut it into positive electrode sheets according to the size of the battery.

[0028] (3) vacuum drying

[0029] Put the rolled positive electrode sheet into a vacuum oven and dry it at 200° C. for 12 hours to obtain a carbon cathode for a lithium / thionyl chloride battery for use.

[0030] figure 1 is the molecular...

Embodiment 2

[0032] (1) and powder

[0033] Acetylene carbon black (battery grade): 2.64g

[0034] PTFE emulsion (60% aqueous solution): 0.6ml

[0035] Isopropanol (analytical pure): 24ml

[0036] Cobalt phthalocyanine complex: 0.061g (2% by mass)

[0037] Weigh the polytetrafluoroethylene emulsion according to the proportion and put it into an agate crucible, then weigh acetylene carbon black and cobalt phthalocyanine into it, add 8ml of isopropanol as a solvent, stir and mix evenly to form a carbon cathode paste.

[0038] (2) Roll forming

[0039] Put the uniformly mixed cathode paste into a roller machine for multiple rolling to form a film with a thickness of 1-2mm, and cut it into positive electrode sheets according to the size of the battery.

[0040] (3) vacuum drying

[0041] Put the rolled positive electrode sheet into a vacuum oven and dry it at 250° C. for 12 hours to obtain a carbon cathode for a lithium / thionyl chloride battery for use.

Embodiment 3

[0043] (1) and powder

[0044] Acetylene carbon black (battery grade): 2.64g

[0045] PTFE emulsion (60% aqueous solution): 0.6ml

[0046] Isopropanol (analytical pure): 24ml

[0047] Phthalocyanine cobalt complex: 0.333g (mass ratio 10%)

[0048] Weigh the polytetrafluoroethylene emulsion according to the proportion and put it into an agate crucible, then weigh acetylene carbon black and cobalt phthalocyanine into it, add 8ml of isopropanol as a solvent, stir and mix evenly to form a carbon cathode paste.

[0049] (2) Roll forming

[0050] Put the uniformly mixed cathode paste into a roller machine for multiple rolling to form a film with a thickness of 1-2mm, and cut it into positive electrode sheets according to the size of the battery.

[0051] (3) vacuum drying

[0052] Put the rolled positive electrode sheet into a vacuum oven and dry it at 250° C. for 12 hours to obtain a carbon cathode for a lithium / thionyl chloride battery for use.

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Abstract

The invention discloses a carbon cathode of a lithium / thionyl chloride cell and a preparation method thereof. The preparation method comprises the following steps: a. mixing acetylene black, polytetrafluoroethylene aqueous solution with 60% weight concentration and isopropyl alcohol according to a weight ratio of 22:5:200, adding cobalt phthalocyanine complex which accounts for 2-10% of the total weight of the solid mixture, and evenly mixing various components to obtain cathode paste and powder; b. rolling the cathode paste and powder for molding; and c. drying in vacuum. In the preparation method, the cobalt phthalocyanine complex is doped into the carbon cathode of the lithium / thionyl chloride cell to act as an electrocatalyst and a pore forming agent, thus improving the porosity of the carbon cathode, increasing the surface area of the carbon cathode, effectively reducing the transmission resistance of reactive ions and electric charge in the multi-porous carbon electrode, being capable of improving the discharge capacity and the operating voltage of the lithium / thionyl chloride cell, and improving the high-current discharge capacity of the cell.

Description

technical field [0001] The invention relates to a method for preparing battery electrodes, in particular to a method for preparing carbon cathodes for lithium / thionyl chloride batteries. Background technique [0002] Lithium / thionyl chloride (Li / SOCl 2 ) battery is currently the battery with the highest specific energy in chemical power sources. It has a high working voltage and a stable discharge voltage comparable to zinc-silver batteries. Its mass specific energy is about twice that of the same zinc-silver battery. +55℃, the storage life is as long as 5 to 10 years. For spacecraft such as satellites, the heavy primary power supply has always been a restrictive factor for increasing the payload of satellites. my country's short-period spacecraft such as returnable satellites have always used zinc-silver batteries as the main power supply, but recently the large-capacity Li / SOCl battery developed by the Meiling Chemical Plant of China Aerospace Science and Industry Corpor...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/08H01M4/96H01M4/88
CPCY02E60/12Y02E60/50
Inventor 葛红花郭永胜国瑞峰吴一平周国定
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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