A kind of composite cathode material that reduces self-discharge degree and its preparation method and application

Abstract

The invention discloses a composite positive electrode material for reducing the self-discharge degree, which is made of thermal battery active positive electrode material, polar thiophilic fixing material, potassium-containing electrolyte and high-conductivity conductive agent, and the mass ratio of the above raw materials is: heat Battery active positive electrode material: polar thiophilic fixing material: potassium-containing electrolyte: high-conductivity conductive agent = 50-90: 2-40: 10-30: 0.1-5. The preparation method of the present invention can reduce the self-discharge degree of thermal battery composite positive electrode material with excellent performance and high consistency, and the prepared composite positive electrode material can significantly reduce the self-discharge degree of thermal battery positive electrode material at low current density, which can significantly reduce The capacity loss caused by the self-discharge of the sulfide positive electrode of the thermal battery at a lower current density improves the output specific capacity of the positive electrode of the thermal battery at a lower current density, significantly prolongs the working time, and is suitable for thermal batteries that work for a long time.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a composite positive electrode material with reduced self-discharge degree, a preparation method and an application. Background technique [0002] A thermal battery is a primary storage battery that relies on pyrotechnic materials to melt the eutectic electrolyte to make the positive and negative electrodes react. Due to its unique working mechanism, thermal batteries are widely used as starting power sources for weapons and military devices. Because the ionic conductivity of the molten salt electrolyte far exceeds that of the lithium-ion electrolyte by several orders of magnitude, the thermal battery can provide excellent power output performance in a short time. However, since the thermal battery is a high-temperature working battery (the internal temperature of the thermal battery is about 500°C during operation), the dissipation of heat and the loss of ...

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Problems solved by technology

[0010] However, the modification schemes disclosed in the above documents do not improve the self-discharge phenomenon of positive and negative electrode capacity fading caused by the generation of polysulfides at the active positive electrode when the thermal battery is working for a long time, and there is no intention to reduce the active positive electrode material of the thermal battery. Self-discharge phenomenon at low current density

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