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 r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0016] Set the mass score to 30% CoS 2 , 50% NiS 2 , 2% Li 2 O, 18% of the ion conductive agent is mixed uniformly to obtain a composite cathode material precursor; the precursor is transferred into a ceramic bowl, placed in an inert gas protection sintering furnace, sintered at 400 ℃, in an inert gas environment for 6 hours, and then Cooled to below 60℃ in an inert gas environment, pulverized into 80 mesh powder to obtain a composite cathode material intermediate; then under the condition of an ambient humidity of less than 3%, add 1% carbon nanometers to the composite cathode...

Example Embodiment

[0017] The second embodiment is to manufacture the ion conductive agent first, dry the LiCl, LiF and LiBr component materials at a temperature of 175°C for 10 hours, then mix them evenly at a weight ratio of 22:9.6:68.4, and then burn the eutectic salt at 550°C 6h, then cool and grind into a 200 mesh powder in an environment with a humidity of less than 3% for later use, and then dry the carbon nanotubes in a vacuum at 150°C for 4h.

[0018] CoS with a mass score of 45% 2 , 30% NiS 2 , 1% Li 2 O, 24% ion conductive agent is mixed uniformly to obtain a composite cathode material precursor; the precursor is transferred into a ceramic bowl, placed in an inert gas protection sintering furnace, sintered at 460 ℃, in an inert gas environment for 8 hours, and then Cooled to below 60℃ in an inert gas environment, pulverized into 80 mesh powder to obtain the composite cathode material intermediate; then under the condition that the ambient humidity is less than 3%, add 2% carbon nanometers...

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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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