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A composite positive electrode for rapidly activating thermal battery and its preparation method

A composite positive electrode and thermal battery technology, applied in the electrodes, battery electrodes, circuits of primary batteries, etc., can solve the problem of increasing activation time, and achieve the effect of reducing activation time, good conductivity, and reducing internal resistance

Active Publication Date: 2018-09-07
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

conventional thermal battery ( figure 1 ) when activated, the heating plate burns from the outside to the inside, and the heat released by the combustion must pass through the substrate and the positive plate in order to be transferred to the separator. The activation time is greatly increased. The activation time of the existing thermal batteries is concentrated in 0.2-0.8s

Method used

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  • A composite positive electrode for rapidly activating thermal battery and its preparation method
  • A composite positive electrode for rapidly activating thermal battery and its preparation method
  • A composite positive electrode for rapidly activating thermal battery and its preparation method

Examples

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preparation example Construction

[0022] A preparation method for rapidly activating a thermal battery composite positive electrode, the method comprising: physically mixing the pre-coated thermal battery positive electrode material and heating powder in proportion to uniformity, and adopting a powder compaction method to form, and inserting a wire mesh into the sheet as a The supporting skeleton prevents deformation and forms a network of technical filaments to enhance conductivity.

[0023] Preferably, the above-mentioned wire mesh needs to be flattened and embedded in the positive electrode layer, the diameter of the wire mesh is 60%-90% of the sheet diameter, and the wire is made of a material with good conductivity and corrosion resistance, such as copper, nickel, silver, etc.

[0024] Preferably, when the mixing ratio of the heating powder in the composite positive electrode is more than 20%, a combustion type positive electrode can be formed, and the separate molding of the heating sheet can be canceled ...

Embodiment 1

[0025] Embodiment 1: A composite positive electrode for fast activation thermal battery, its composition percentage is: 45% positive electrode material FeS 2 , 55% heating powder Fe-KClO 4 , and its preparation method is as follows: the FeS 2 The molten salt electrolyte is used for coating pretreatment, and the heating powder (Fe-KClO 4 ) mixed at room temperature at a ratio of 55% to obtain a composite positive electrode material; place the wire mesh at the bottom of the mold, pour the weighed composite positive electrode into it, spread it out, pour it into a weighed diaphragm, spread it out, and press Next filming. Compared with conventional assembly, the activation time of the positive electrode battery prepared in Example 1 can be reduced by 29%, and the activation time can reach 85ms.

Embodiment 2

[0026] Embodiment 2: A composite positive electrode for fast activation thermal battery, its composition percentage is: 85% positive electrode material CoS 2 , 15% heating powder Fe-KClO 4 , and its preparation method is as follows: the CoS 2 The molten salt electrolyte is used for coating pretreatment, and the heating powder (Fe-KClO 4 ) mixed at room temperature at a ratio of 15% to obtain a composite positive electrode. Pour the heating powder into the mold and flatten it. Put the wire mesh on the heating powder. The diaphragm is flattened and made into slices under a certain pressure. Compared with conventional assembly, the activation time of the positive electrode battery prepared in Example 2 can be reduced by 23%, and the activation time can reach 92ms.

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Abstract

The invention relates a composite positive electrode of a rapidly-activated thermal battery and an electrode manufacturing method. The composite positive electrode is mainly manufactured from thermal battery positive electrode powder, heating powder and a wire mesh by physical compression molding, wherein the positive electrode powder is coated with a molten salt electrolyte; the heating powder is 5-60 percent of the positive electrode powder; the wire mesh in an electrode assembly is embedded into a positive electrode layer; and the diameter of the wire mesh is 60-90 percent of a flake diameter. In a process of activating the thermal battery, the heating powder in the composite positive electrode burns, so that a positive electrode coating layer can be activated rapidly; heat transfer intermediate processes can be reduced; and the electrolyte in a diaphragm is directly heated. Moreover, the conductivity of the electrode can be improved through excessive iron in the wire mesh and the heating powder, and rapid voltage buildup is facilitated. The positive electrode has a high molding property and high heat transfer efficiency, and is suitable for a short-time rapidly-activated thermal battery design; and the activation time can be shortened greatly.

Description

technical field [0001] The invention relates to the technical field of batteries. The invention relates to a composite positive electrode of a high-activity thermal battery and a preparation method thereof. The technology is mainly applied to rapidly activating a thermal battery in a short time. Background technique [0002] The thermal battery is a heat-activated reserve battery. It uses molten salt as an electrolyte and uses a heat source to melt and activate a disposable reserve battery. When the thermal battery is working, the internal temperature is 450°C-550°C. It has large output power and short activation time. , long storage life, strong environmental adaptability and so on. Rapid response thermal batteries have shown great advantages in many fields such as deep space exploration, emergency rescue, and system equipment design. [0003] Throughout the development of thermal battery technology, there are few reports on rapid response thermal battery technology. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/36H01M4/62H01M4/08
CPCH01M4/08H01M4/62H01M6/36
Inventor 吴启兵贺焰石斌田千秋张勇冯勇吴展强赵洪楷
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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