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Composite cathode material for thermal battery suitable for long-time terminal heavy current discharge

A composite positive electrode material and high-current discharge technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of terminal load-carrying large current drop, capacity loss, and high resistivity, etc., and achieve high-current carrying capacity. The effect of prolongation and improvement of electrical conductivity

Active Publication Date: 2018-05-15
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the prior art, when the positive electrode material of the thermal battery is placed on hold for a long time in the early stage, due to the capacity loss caused by the self-discharge phenomenon, and the self-discharge phenomenon generates a product with a relatively large resistivity, As a result, the ability to carry a large current at the terminal decreases. In order to solve the above-mentioned problems, the present invention provides a preparation technology for composite positive electrode materials for thermal batteries suitable for long-term terminal high-current discharge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Firstly, the ion-conducting agent is produced, and the LiCl and KCl component materials are dried at 175°C for 10 hours, mixed evenly in a weight ratio of 45:55, and the eutectic salt is fired at 420°C for 8 hours, and then Cool in an environment with a humidity of less than 3% and grind it into a 150-mesh powder for later use, and then dry the carbon nanotubes under vacuum at 150°C for 4 hours.

[0016] Set the quality score to 30% CoS 2 , 50% NiS 2 , 2% Li 2 0. 18% of the ion-conducting agent is mixed evenly to obtain the precursor of the composite positive electrode material; the precursor is transferred to a ceramic bowl, put into an inert gas protection sintering furnace, and sintered at 400°C for 6h under an inert gas environment, and then placed in an inert gas environment. Cool to below 60°C in an inert gas environment, crush it into 80-mesh powder, and obtain a composite cathode material intermediate; then add 1% carbon nanometers to the composite ...

Embodiment 2

[0017] Example 2, firstly make the ion conductive agent, dry the LiCl, LiF and LiBr component materials at 175°C for 10h, mix them uniformly in a weight ratio of 22:9.6:68.4, and then fire the eutectic salt at 550°C 6h, then cooled in an environment with a humidity less than 3%, and ground into 200-mesh powder for later use, and then dried the carbon nanotubes under vacuum at 150°C for 4h.

[0018] Set the quality score to 45% CoS 2 , 30% NiS 2 , 1% Li 2 0. 24% of the ion-conducting agent is mixed evenly to obtain the precursor of the composite positive electrode material; the precursor is transferred to a ceramic bowl, put into an inert gas protection sintering furnace, and sintered at 460° C. for 8 hours under an inert gas environment, and then placed in an inert gas environment Cool to below 60°C in an inert gas environment, crush it into 80-mesh powder, and obtain a composite cathode material intermediate; then add 2% carbon nanometers to the composite cathode material i...

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PUM

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Abstract

The invention discloses a composite cathode material for a thermal battery suitable for long-time terminal heavy current discharge. The composite cathode material is characterized by being prepared from the following components by mass fraction: 30 to 50 percent of CoS2, 30 to 50 percent of NiS2, 1 to 3 percent of Li2O, 15 to 30 percent of an ion conductive agent and 0.5 to 2 percent of an electronic conductor. By adding a NiS2 cathode material, elemental nickel with high conductivity is generated by the NiS2 cathode material in the self-discharge process, and further the later conductivity ofan electrode material is improved; secondly, the conductivity of the whole composite cathode material is improved without affecting the output capacity of the composite cathode material due to the addition of a small amount of a carbon nanotube electronic conductor with high conductivity; and finally, due to the addition of the ion conductive agent, the migration rate of Li<+> in the electrode reaction process is improved and the concentration polarization in the reaction process is reduced.

Description

technical field [0001] The invention belongs to the field of thermal batteries, and in particular relates to a composite positive electrode material suitable for long-term terminal high-current discharge thermal batteries. 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 primary reserve battery. The internal temperature is 450°C to 550°C during operation. Due to its small internal resistance, high specific energy and specific power, wide operating environment temperature, long storage time, rapid and reliable activation, compact structure, non-directionality during use and not affected by installation orientation, good mechanical properties, No need for maintenance and other advantages, it has been favored by the military as soon as it came out, and has developed into an ideal power supply for modern weapons and emergency systems such as missiles, nuclear...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M6/36
CPCH01M4/362H01M4/5815H01M4/62H01M4/625H01M6/36
Inventor 冯勇王建勇吴启兵陈铤李云伟魏俊华石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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