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Application of tungsten-molybdenum sulfide in thermal battery

A technology of sulfide and thermal batteries, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low decomposition temperature, low utilization rate of electrode materials, limited theoretical capacity of positive electrode materials, etc.

Active Publication Date: 2020-05-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the deficiencies of the prior art, and solve the technology that restricts the development of thermal batteries such as the limited theoretical capacity of positive electrode materials, low decomposition temperature, low utilization rate of electrode materials, and poor safety performance in the current iron-cobalt-nickel sulfide thermal battery system The problem is to provide the application of tungsten-molybdenum sulfide in thermal batteries. The thermal battery electrochemical system uses tungsten-molybdenum sulfide as the positive electrode and lithium metal and lithium alloy as the negative electrode. Metal tungsten (molybdenum), the negative electrode loses electrons to lithium ions in free state lithium, and its electrochemical reaction is as follows:

Method used

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  • Application of tungsten-molybdenum sulfide in thermal battery

Examples

Experimental program
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Effect test

Embodiment 2

[0078] Embodiment 2—using molybdenum disulfide as tungsten molybdenum sulfide

[0079] (1) High temperature roasting

[0080] Place molybdenum disulfide in a quartz tube furnace, pass through argon protective gas, heat it up to 850°C at a heating rate of 10°C / min, roast for 4 hours, cool to 60°C with the furnace, and pass through a 100-mesh sieve.

[0081] (2) Vacuum-atmosphere replacement roasting

[0082] Put the molybdenum disulfide after high-temperature roasting in step (1) into a vacuum roasting furnace, keep the pressure in the furnace at a vacuum of 0.015 MPa, raise the temperature to 600 °C at a heating rate of 10 °C / min, and roast for 1 hour. Slowly feed the equilibrium transfer gas to 0.1Mpa, after calcination for 0.5h, vacuumize and repeat the atmosphere replacement 5 times, and cool down with the furnace in a vacuum state to obtain a molybdenum disulfide sample. The equilibrium transfer gas is a mixed gas of water vapor and argon. The volume percentage of water ...

Embodiment 3

[0091] Embodiment 3—Using tungsten disulfide and molybdenum disulfide as tungsten molybdenum sulfide

[0092] (1) High temperature roasting

[0093] Place molybdenum disulfide and tungsten disulfide in a quartz tube furnace, pass through argon protective gas, raise the temperature to 850 °C at a heating rate of 10 °C / min, roast for 4 hours, cool to 60 °C with the furnace, and pass through 100 mesh sieve.

[0094](2) Vacuum-atmosphere replacement roasting Put the molybdenum disulfide and tungsten disulfide after step (1) high-temperature roasting into a vacuum roasting furnace. The temperature was raised to 600°C at a high speed, and after 1 hour of calcination, the equilibrium transfer gas was slowly introduced to 0.1Mpa. After 0.5 hour of calcination, the atmosphere was replaced by vacuuming for 5 times, and the molybdenum disulfide sample was obtained by cooling with the furnace in a vacuum state. The transfer gas is a mixed gas of water vapor and argon, and the volume per...

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Abstract

The invention discloses the application of tungsten-molybdenum sulfide in a thermal battery. A thermal battery electrochemical system taking the tungsten-molybdenum sulfide as a positive electrode andmetal lithium and lithium alloy as a negative electrode is adopted, the positive electrode reaction is that tungsten (molybdenum) metal ions receive electrons and are reduced into metal tungsten (molybdenum), and the negative electrode is changed into lithium ions in the mode that free-state lithium loses electrons. Tungsten-molybdenum sulfide is used as a positive electrode; the decomposition temperature of the tungsten-molybdenum sulfide material is high; in the long-time high-temperature discharge process, the self-discharge of a positive electrode material is small, the material utilization rate is high and is 10% or above higher than that of an iron-cobalt-nickel disulfide positive electrode, in the long-time discharge process, the battery discharge is stable, the voltage fluctuationis far less than that of a thermal battery system of the iron-cobalt-nickel-sulfur positive electrode, and the tungsten-molybdenum sulfide is very suitable for a high-voltage-precision component integration system.

Description

technical field [0001] The invention belongs to the technical field of chemical power thermal batteries, and more specifically relates to the application of tungsten-molybdenum sulfide in thermal batteries. Background technique [0002] Thermal battery is a high-temperature molten salt battery, which is an electrochemical system established by heating solid electrolyte to molten ionic conductor by its own heating system. Thermal battery has the characteristics of large output power, long storage life, and short activation time. Ideal power supply for defense equipment. As a military power supply, in addition to requiring the battery to have good electrochemical performance, it also places extremely high requirements on quality and reliability. Since the thermal battery is a molten salt battery, the electrode material must have a high decomposition temperature in addition to sufficient capacity and good conductivity to ensure good electrochemical performance and safe, stable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M6/36
CPCH01M4/362H01M4/5815H01M4/366H01M4/624H01M6/36
Inventor 胡文彬田千秋韩晓鹏
Owner TIANJIN UNIV
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