A kind of preparation method of bismuth molybdenum bimetallic sulfide of negative electrode material of sodium ion battery

A technology for sodium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor cycle life and rapid capacity decay of sodium ion batteries, and achieve short process, uniform and controllable morphology, The effect of high purity

Active Publication Date: 2022-02-01
帕瓦(兰溪)新能源科技有限公司
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Problems solved by technology

However, a large number of research reports on bismuth-based sulfide materials for sodium-ion batteries have shown that the volume expansion of bismuth-based sulfide materials during the charge and discharge process leads to rapid capacity fading and poor cycle life of sodium-ion batteries.

Method used

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  • A kind of preparation method of bismuth molybdenum bimetallic sulfide of negative electrode material of sodium ion battery
  • A kind of preparation method of bismuth molybdenum bimetallic sulfide of negative electrode material of sodium ion battery
  • A kind of preparation method of bismuth molybdenum bimetallic sulfide of negative electrode material of sodium ion battery

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Effect test

Embodiment 1

[0030] (1) Weigh 1.57g of bismuth chloride and 0.511g of sodium molybdate, then add the weighed bismuth source and tin source to each beaker filled with ethylene glycol (7mL), stir magnetically at room temperature until the particles are completely dissolved , mixing the ethylene glycol solution dissolved with the bismuth source and the molybdenum source, and magnetic stirring at room temperature to form a uniform mixed solution;

[0031] (2) Add absolute ethanol (25mL) to the mixed solution obtained in step (1), stir evenly at room temperature, and then place it in a 100mL polytetrafluoroethylene reactor for high-temperature solvothermal reaction. The reaction temperature is 150°C. The time is 12 hours;

[0032] (3) The product after the high-temperature solvothermal reaction in step (2) was centrifuged and washed 6 times (3 times each with absolute ethanol and deionized water), and dried at 80°C for 16 hours to obtain a yellow-brown bismuth-molybdenum oxide precursor ;

[...

Embodiment 2

[0037] (1) Weigh 3.17g of bismuth chloride and 1.021g of sodium molybdate, then add the weighed bismuth source and tin source to each beaker filled with ethylene glycol (8mL), stir magnetically at room temperature until the particles are completely dissolved , mixing the ethylene glycol solution dissolved with the bismuth source and the molybdenum source, and magnetic stirring at room temperature to form a uniform mixed solution;

[0038] (2) Add absolute ethanol (25mL) to the mixed solution obtained in step (1), stir evenly at room temperature, and then place it in a 100mL polytetrafluoroethylene reactor for high-temperature solvothermal reaction. The reaction temperature is 150°C. The time is 12 hours;

[0039] (3) The product after the high-temperature solvothermal reaction in step (2) was centrifuged and washed 6 times (3 times each with absolute ethanol and deionized water), and dried at 90°C for 12 hours to obtain a yellow-brown bismuth-molybdenum oxide precursor ;

[...

Embodiment 3

[0044] (1) Weigh 1.57g of bismuth chloride and 0.511g of sodium molybdate, then add the weighed bismuth source and tin source to each beaker filled with ethylene glycol (7mL), stir magnetically at room temperature until the particles are completely dissolved , mixing the ethylene glycol solution dissolved with the bismuth source and the molybdenum source, and magnetic stirring at room temperature to form a uniform mixed solution;

[0045] (2) Add absolute ethanol (30mL) to the mixed solution obtained in step (1), stir evenly at room temperature, and then place it in a 100mL polytetrafluoroethylene reactor for high-temperature solvothermal reaction. The reaction temperature is 150°C. The time is 12 hours;

[0046] (3) The product after the high-temperature solvothermal reaction in step (2) was centrifuged and washed 6 times (3 times each with absolute ethanol and deionized water), and dried at 100°C for 24 hours to obtain a yellow-brown bismuth-molybdenum oxide precursor ;

...

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Abstract

A method for preparing a bismuth-molybdenum bimetallic sulfide, a negative electrode material for a sodium ion battery, comprising the following steps: (1) weighing a bismuth source and a molybdenum source at a molar ratio of Bi:Mo=2:1, and then adding In the diol container, stir to dissolve, mix the ethylene glycol solution dissolved with bismuth source and molybdenum source, and stir to form a uniform mixed solution; (2) Add absolute ethanol to the mixed solution, stir evenly, and place in the reaction Solvothermal reaction in the still; (3) Centrifugal washing and drying; (4) Place the bismuth molybdenum oxide precursor in the corundum ark and in the middle of the tube furnace, and place a For the corundum ark of the sulfur source, the tube furnace is sealed and the reducing gas is introduced. After heat treatment, it is naturally cooled to room temperature. The invention has short process flow, controllable parameters, simple equipment, wide sources of raw materials, and environmental friendliness, and bismuth-molybdenum bimetallic sulfide materials with different nanoscales can be obtained by adjusting relevant parameters.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a sodium ion battery, in particular to a preparation method of bismuth-molybdenum bimetallic sulfide, a negative electrode material of a sodium ion battery. Background technique [0002] Environmental pollution and energy shortages have become the bottleneck of the rapid development of modern society. As a representative of the new generation of energy storage and conversion systems, commercial lithium-ion batteries have high specific energy, high working voltage, small self-discharge, long cycle life, and environmental friendliness. Such excellent physical and chemical properties have been widely used in portable electronic products, 3C digital and pure electric, plug-in hybrid vehicles. With the growing scale of the new energy market, the demand for various lithium-ion battery products is increasing day by day. The problem of sharp increase in production costs caused by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/5815H01M10/054H01M2004/027Y02E60/10
Inventor 欧星曹亮张建永张宝张佳峰
Owner 帕瓦(兰溪)新能源科技有限公司
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