Preparation method of thermal battery positive electrode material, and thermal battery made of thermal battery positive electrode material
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A positive electrode material and thermal battery technology, applied in the field of chemical materials, can solve the problems of high price and high resistivity, and achieve the effect of low price, low internal resistance and high working voltage
Inactive Publication Date: 2016-12-07
SHANGHAI INST OF SPACE POWER SOURCES
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Iron disulfide is mainly extracted from natural ores, with stable performance and low price, but the resistivity is relatively large (17.7), and the thermal decomposition temperature is 550°C
Cobalt disulfide is a positive electrode material active material developed for the weakness of iron disulfide. The electronic conductivity has been greatly improved, the resistivity is only 0.002, and the th
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Embodiment 1
[0026] Example 1. After mixing iron disulfide, cobalt disulfide, electrolyte LiF-LiCl-LiBr and lithium oxide in a mass ratio of 65:20:20:5, perform lithiation treatment, wherein the mass percentage of the electrolyte is: LiF Accounted for 9.6%, LiCl accounted for 22.0%, LiBr accounted for 68.4%. figure 2 is the X-ray diffraction (XRD) pattern of the obtained multi-element cathode material.
Embodiment 2
[0027] Example 2, after mixing iron disulfide, cobalt disulfide, spacer powder (containing 50 wt.% LiCl-LiBr-KBr and 50 wt.% magnesium oxide) and lithium oxide in a mass ratio of 70:20:9:1 , for lithiation treatment, wherein the mass percentage of the electrolyte is: LiCl accounts for 12.05%, LiBr accounts for 36.54%, and KBr accounts for 51.41%. image 3 It is the thermogravimetric analysis (TGA) diagram of the obtained multi-element cathode material.
Embodiment 3
[0028] Example 3. After mixing iron disulfide, electrolyte LiCl-KCl and lithium sulfide uniformly in a mass ratio of 20:60:15:5, lithiation treatment is carried out, wherein the mass percentage of the electrolyte is: LiCl accounts for 45%, KCl accounts for 45%. 55%;
[0029] After cobalt disulfide, electrolyte LiCl-KCl and lithium sulfide are uniformly mixed in a mass ratio of 20:60:15:5, lithiation treatment is performed, wherein the mass percentage of the electrolyte is: LiCl accounts for 45%, KCl accounts for 55%;
[0030] Mix the above-mentioned two materials evenly to prepare a multi-element positive electrode material.
[0031] The above binary LiCl-KCl electrolyte was mixed with magnesium oxide at a mass ratio of 60:40 to prepare the spacer powder.
[0032] Using the multi-component positive electrode material in this example as the positive electrode, combine the separator powder and the lithium-boron alloy negative electrode of this example to prepare a single batter...
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Abstract
The invention discloses a preparation method of a thermal battery positive electrode material. The preparation method comprises the following steps: 1, mixing iron disulfide with additives in dry gas environment until the iron disulfide and the additives are uniform, putting the obtained mixture in a reaction furnace, continuously introducing an inert gas to the reaction furnace, rising the temperature in the reaction furnace to 320-550 DEG C, keeping the temperature for 0.5-8 h, taking out the obtained iron disulfide positive electrode material when the temperature in the reaction furnace decreases to 50 DEG C or below, crushing the iron disulfide positive electrode material, and sieving the crushed iron disulfide positive electrode material; 2, mixing cobalt sulfide with the additives until the cobalt sulfide and the additives are uniform, putting the obtained mixture in the reaction furnace, continuously introducing an inert gas to the reaction furnace, rising the temperature in the reaction furnace to 320-550 DEG C, keeping the temperature for 0.5-8 h, taking out the obtained iron disulfide positive electrode material when the temperature in the reaction furnace decreases to 50 DEG C or below, crushing the cobalt disulfide positive electrode material, and sieving the crushed cobalt disulfide positive electrode material; and 3, mixing the iron disulfide positive electrode material with the cobalt disulfide positive electrode material until the iron disulfide positive electrode material and the cobalt disulfide positive electrode material are uniform in order to prepare the polynary positive electrode material. The invention also discloses a thermal battery made of the positive electrode material.
Description
technical field [0001] The invention belongs to the field of chemical materials, and relates to a thermal battery cathode material and a thermal battery prepared from the cathode material. Background technique [0002] As a one-time storage battery, when the thermal battery is not activated, the electrolyte is a non-conductive solid, which can be stored for a long time without performance degradation; when activated, the electrolyte rapidly melts to form a high-conductivity ion conductor, and the battery can be used in a very short period of time. power transmission. These advantages make thermal batteries widely used in weapon systems and space survey systems. Thermal batteries also have applications in other fields, such as electric vehicles, aircraft emergency systems, and geothermal drilling. [0003] In a typical thermal battery, in addition to the heating system and insulation system, its electrochemical system includes a negative electrode, a positive electrode, and...
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