Preparation method of wet process and dry process thermal battery composite positive electrode

Abstract

The invention provides a preparation method of a wet process and dry process thermal battery composite positive electrode. The advantages of a wet process FeS2 positive electrode and a dry process CoS2 positive electrode are absorbed, the self capacity is improved, the test is carried out under the same electrical property condition, the wet process and dry process positive electrode has no voltage peak at the initial discharge stage, the working time can be prolonged by 10-30%, and meanwhile, the composite positive electrode is suitable for the discharge of a high-power thermal battery.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a preparation method of a "wet method" + "dry method" thermal battery composite positive electrode. Background technique [0002] Currently, dry FeS is the most widely used cathode material for thermal batteries. 2 Cathode material or dry CoS 2 Cathode material. [0003] FeS 2 The positive electrode material has a high electrode potential, about 2.2V relative to lithium, and a density of 4.9g / cm 3 , the capacitance is 0.446A h / g; the decomposition temperature is 550°C, the high temperature resistance is poor; the resistivity is 0.036Ω cm, the electronic conductivity is poor in the chemical reaction, FeS 2 The positive electrode material will generate high waves at the initial stage of discharge, which will affect the battery voltage accuracy and working life. by FeS 2 Lithium oxide is added to the medium for lithiation (dry treatment method) to remove ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: the present invention solves the problem of high ripple and high load and high current discharge performance in the initial discharge stage of the hot battery, and uses a wet method to process FeS 2 Cathode material + dry processing CoS 2 Composite positive electrode made of positive electrode material

From the design, the problems such as the peak voltage at the initial stage of discharge, the large internal resistance and short time during discharge, and the difficulty of discharging with high load and large current have been solved.