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Composite positive electrode material for long-lifetime thermal battery and preparation method of composite positive electrode material

A composite positive electrode material and thermal battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of no molybdenum disulfide and its composite materials, and achieve the effects of flat discharge platform, long discharge time, and broad application prospects

Active Publication Date: 2018-01-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is currently no research on the application of molybdenum disulfide and its composite materials in thermal battery cathode materials.

Method used

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  • Composite positive electrode material for long-lifetime thermal battery and preparation method of composite positive electrode material
  • Composite positive electrode material for long-lifetime thermal battery and preparation method of composite positive electrode material
  • Composite positive electrode material for long-lifetime thermal battery and preparation method of composite positive electrode material

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preparation example Construction

[0022] 1) Precursor preparation, weighing the cobalt source, molybdenum source, and sulfur source according to the stoichiometric ratio, and adding a surfactant to the beaker at the same time, fully magnetic stirring to mix the raw materials evenly, adding the reducing agent, and set aside. In the process of precursor configuration, the cobalt source is cobalt chloride hexahydrate (CoCl2 6H2O), the sulfur source is sodium thiosulfate pentahydrate (Na2S2O3 5H2O), thioacetamide (CH3CSNH2) and thiourea (H2NCSNH2), The molybdenum source is ammonium molybdate and sodium molybdate, and the molar ratio of cobalt to molybdenum is 0, 1 / 9-9. The additives include a surfactant and a reducing agent, wherein the surfactant is sodium dodecylbenzenesulfonate, and the reducing agent is citric acid monohydrate.

[0023] 2) Hydrothermal synthesis, the homogeneously mixed precursor was transferred to a 100 ml Teflon-lined stainless steel autoclave. After the stainless steel high-pressure reacti...

Embodiment 1

[0028] 0.8828 g of ammonium molybdate and 2.42 g of sodium thiosulfate pentahydrate were dissolved in 60 ml of deionized water, 0.2 g of citric acid monohydrate was added as a reducing agent and magnetically stirred for 30 minutes, then the mixed solution was transferred to a 100 ml Teflon liner stainless steel autoclave. After the stainless steel autoclave is sealed, it is placed in a vacuum drying oven, kept at 200°C for 22 hours, and then naturally cooled to room temperature. The black precipitate was collected by centrifugation, washed several times with carbon disulfide, ethanol and distilled water and filtered to obtain a black powder. Finally, the powder was dried at 60°C for 12 hours. In this embodiment, lithium-silicon alloy powder, self-made all-lithium electrolyte separator powder, and self-made positive electrode powder are used to carry out sheeting of thermal battery single cells. The positive electrode material is discharged at 450° C., the first discharge pla...

Embodiment 2

[0030] 0.6050 g of sodium molybdate, 0.5984 g of cobalt sulfide hexahydrate and 1.6257 g of thioacetamide were dissolved in 60 ml of deionized water, and 0.2 g of citric acid monohydrate was added as a reducing agent and magnetically stirred for 30 minutes, then the mixed solution was transferred to 100 ml Teflon-lined stainless steel autoclave. After the stainless steel autoclave is sealed, it is placed in a vacuum drying oven, kept at 180°C for 24 hours, and then naturally cooled to room temperature. The black precipitate was collected by centrifugation, washed several times with carbon disulfide, ethanol and distilled water and filtered to obtain a black powder. Finally, the powder was dried at 60°C for 12 hours. In this embodiment, lithium-silicon alloy powder, self-made all-lithium electrolyte separator powder, and self-made positive electrode powder are used to carry out sheeting of thermal battery single cells. The positive electrode material is discharged at 450° C.,...

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Abstract

The invention provides a molybdenum disulfide and cobalt disulfide composite positive electrode material which is hydrothermally synthesized and is used for a long-lifetime thermal battery. The composite positive electrode material is characterized in that the material has a hollow molybdenum disulfide petal-shaped framework structure, wherein cobalt disulfide fills and covers a surface of a framework, the grain size of the surface-covered cobalt disulfide is 1-5 micrometers, and the decomposition temperature of the material is 650-700 DEG C. When the material is applied to a LiSi- self-prepared composite positive electrode material system, the voltage of a first discharging platform is 2-1.8V under discharging at 450 DEG C and current density of 50mA, no obvious voltage peak is generated,the discharging platform is smooth, the discharging time is relatively long, and the material is suitably used for the long-lifetime thermal battery. Since the reaction of the prepared positive electrode material is completed in a liquid phase in one time, the process equipment is simple, the raw material is available, the preparation cost is relatively low, and the material is high in repeatability and has a wide application prospect.

Description

technical field [0001] The invention relates to a positive electrode material for a thermal battery, in particular to a cobalt disulfide and molybdenum disulfide composite positive electrode material for a long-life thermal battery and a preparation method thereof. Background technique [0002] Among transition metal sulfides, CoS 2 with the same FeS 2 The same pyrite structure and low resistivity are beneficial to reduce the ohmic polarization of the electrode, while the regulation of the microscopic morphology can increase the specific surface area of ​​the electrode material, which is beneficial to reduce the electrochemical polarization. Therefore, the self-discharge loss is small, it has a large current discharge capability, and the energy utilization rate is high. Now CoS 2 Has become one of the commonly used cathode materials for thermal batteries, due to better thermal stability than FeS 2 , suitable for long-life thermal batteries. [0003] Molybdenum disulfide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M6/36
Inventor 朱艳丽郑晓頔焦清介
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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