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

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...

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.