Preparation method of positive pole material of thermal battery

Abstract

The invention relates to a preparation method of a positive pole material of a thermal battery, which comprises the following steps: (1) performing forced air drying; (2) performing vacuum drying in a vacuum drying box; (3) containing in a quartz tube, and placing in a crucible resistance furnace for high-temperature treatment; (4) taking out the material which becomes a pole billet out of the quartz tube, and smashing; and (5) weighing nickel chloride treatment powder prepared in (4) according to the proportion, stirring a conductive agent after drying with a molten salt after drying, and preparing the positive pole material of the thermal battery. Commercially available nickel chloride hexahydrate is adopted as a raw material, the forced air drying and the vacuum drying are performed, and the high-temperature treatment is performed on the dried material after smashing and screening; the loose density and the tap density of the material after treatment are improved, the electrical conductivity and the thermal conductivity of the material are improved, and the electrochemical activity of the material is improved; and the weight of water contained in the material is reduced to 1000PPM from 5% before drying. The process is simplified and stabilized, the equipment investment cost is low, and conditions are created for realizing the industrialization of the positive pole material of the thermal batteries.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, in particular to a method for preparing positive electrode materials of thermal batteries. Background technique [0002] The positive electrode materials used in making thermal batteries are generally sulfides, such as iron disulfide or cobalt disulfide. There are deficiencies in thermal batteries prepared from sulfides, mainly in the following three aspects: [0003] (1) There are pulse peaks in the initial stage of battery discharge, which seriously affects the voltage accuracy of the battery [0004] When a typical lithium alloy / disulfide thermal battery is discharged, at the moment of activation, the battery produces an initial spike, then quickly falls back to the normal value, and then discharges smoothly. The generation of the initial peak is due to the presence of sulfur or high-valent oxide impurities in the disulfide. The oxidation potential of these impurities is higher tha...

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Problems solved by technology

The existence of this peak seriously affects the discharge voltage accuracy of the battery. In actual work, the initial peak often leads to unqualified battery quality

[0005] (2) The positive electrode active material decomposes at high temperature, resulting in limited specific energy of the battery

[0006] Both iron disulfide and cobalt disulfide decompose at high temperature. Although the thermal stability of CoS2 is good, it can reach 600°C, which is nearly 100°C higher than FeS2, but the existence of its decomposition also affects the specific energy of the battery. improvement

So far, the discharge specific energy of lithium alloy / disulfide thermal battery is difficult to break through 80Wh / kg

[0007] (3) The voltage of the monomer is low, which is not conducive to improving the specific energy and specific power of the battery

[0010] At present, due to the complex equipment and difficult operation of nickel chloride to prepare thermal battery cathode materials, the uncertain preparation process has always been the technical bottleneck restricting the industrial application of this system thermal battery in my country, which reduces the electrochemical performance of the material.

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