Preparation method of Se-C positive electrode composite material of lithium-selenium battery

A composite material and battery technology, applied in the field of electrochemical batteries, can solve the problems of complex preparation method of nano-carbon materials, poor overall cycle performance, long composite time, etc., to reduce self-discharge and polysulfide ion shuttle effect, The effect of high practical value and short sintering time

Inactive Publication Date: 2015-05-06
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method, using various nano-carbon materials and elemental selenium for melting method compounding, has improved the discharge capacity of the first dozens of times to a certain extent, but the overall cycle performance is still not good, and the nan

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  • Preparation method of Se-C positive electrode composite material of lithium-selenium battery
  • Preparation method of Se-C positive electrode composite material of lithium-selenium battery
  • Preparation method of Se-C positive electrode composite material of lithium-selenium battery

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Experimental program
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Effect test

Embodiment 1

[0029] Weigh 2.1g of selenium powder and 0.9g of Ketjen black respectively, and ball mill for 2 hours at a speed of 400r / min on a ball mill to obtain a uniformly mixed Se-C mixed powder. Then put the ball-milled Se-C mixed powder into a microwave oven, and then introduce argon gas after vacuuming. The heating rate is 10°C / min, and it is kept at 400°C for 1h. The microwave output power is 1.0kW, and the selenium content is obtained. 55.68wt% Se-C microwave composite. Using N-methylpyrrolidone as solvent, the prepared Se-C microwave composite material was slurried with acetylene black and PVDF at a mass ratio of 7:1:2. Finally, the adjusted slurry was evenly coated on the aluminum foil, and placed in a vacuum drying oven at 60° C. for 12 hours. figure 1 It is the XRD pattern of the obtained sample. It can be seen from the figure that after microwave thermal compounding, the compound is in an amorphous state, and all the characteristic peaks of Se disappear, indicating that Se i...

Embodiment 2

[0031] Weigh 2.4g of selenium powder and 0.6g of acetylene black respectively, and ball mill for 4 hours at a speed of 500r / min in a ball mill to obtain a uniformly mixed Se-C mixed powder. Then put the ball-milled Se-C mixed powder in a microwave oven, and after vacuuming, argon gas is introduced. The heating rate is 15°C / min, and it is kept at 300°C for 50min. The microwave output power is 0.8kW, and the selenium content is obtained. 61.32wt% Se-C microwave composite. Using deionized water as a solvent, the prepared Se-C microwave composite material was slurried with Ketjen black conductive carbon black and LA133 at a mass ratio of 7:2:1. Finally, the adjusted slurry was evenly coated on the aluminum foil, and placed in a vacuum drying oven at 70° C. for 10 h. The material is used as the positive electrode, and the metal lithium sheet is used as the negative electrode to assemble a button-type simulated battery. According to the electrical performance test, its capacity can...

Embodiment 3

[0033]Weigh 1.8g of selenium powder and 1.2g of BP2000 conductive carbon black respectively, and ball mill them on a ball mill at a speed of 300r / min for 5h to obtain a uniformly mixed Se-C mixed powder. Then put the ball-milled Se-C mixed powder in a microwave oven, vacuumize it and feed it with nitrogen. The heating rate is 25°C / min, and it is kept at 350°C for 40min. The microwave output power is 0.9kW, and the selenium content is 48.96wt. % of Se-C microwave composites. Using N-methylpyrrolidone as a solvent, the prepared Se-C microwave composite material, BP2000 conductive carbon black and PVDF were slurried at a mass ratio of 7:1.5:1.5. Finally, the adjusted slurry was evenly coated on the aluminum foil, and placed in a vacuum drying oven at 80°C for 8 hours. The material is used as the positive electrode, and the metal lithium sheet is used as the negative electrode to assemble a button-type simulated battery. According to the electrical performance test, the capacity ...

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Abstract

The invention specifically relates to a preparation method of a Se-C positive electrode composite material of a lithium-selenium battery. The preparation method comprises the following steps: firstly, putting selenium and carbon materials into a ball mill and mixing by ball milling, and then putting the mixture into a microwave furnace for microwave heating compounding to prepare the Se-C positive electrode microwave composite material high in dispersion uniformity. The carbon material utilized in the preparation method is a material subjected to commercial quantity production and is low in cost; meanwhile, according to the microwave heating compounding method, the operation process is simple, the energy consumption is low and the yield is high; the product is relatively high in performance consistency, and can be produced continuously and applied commercially.

Description

(1) Technical field [0001] The invention belongs to the field of electrochemical batteries, and in particular relates to a preparation method of a Se-C cathode composite material for a lithium-selenium battery. (2) Background technology [0002] The theoretical specific energy of lithium-sulfur batteries reaches 2600Wh / kg, which is much higher than LiCoO, a common cathode material for lithium-ion batteries. 2 , LiMnO 2 、LiFePO 4 capacity. In addition, lithium-sulfur batteries have the advantages of high specific capacity, no pollution, abundant resources and low price. Therefore, sulfur is a very attractive active material for secondary lithium batteries, especially in the direction of power vehicles, which has a good application prospect. However, limited by the insulation of sulfur and its discharge product lithium sulfide, and the characteristics of a series of lithium polysulfide intermediates formed during charging and discharging, which are easily soluble in electr...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/583
CPCH01M4/364H01M4/38H01M4/583H01M10/052Y02E60/10
Inventor 王卓许寒雪杨晖陈欣王瑛赵成龙
Owner SHANDONG YUHUANG NEW ENERGY TECH
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