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Novel positive electrode isolation layer applied to lithium-sulfur battery, and preparation method for novel positive electrode isolation layer

A lithium-sulfur battery and battery positive electrode technology are applied in the field of new positive electrode separator and its preparation to achieve the effects of reducing battery internal resistance, improving ionic conductivity and improving cycle performance

Inactive Publication Date: 2017-02-22
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problems of existing lithium-sulfur batteries, and provides a functional interlayer used in lithium-sulfur batteries and a preparation method thereof

Method used

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  • Novel positive electrode isolation layer applied to lithium-sulfur battery, and preparation method for novel positive electrode isolation layer
  • Novel positive electrode isolation layer applied to lithium-sulfur battery, and preparation method for novel positive electrode isolation layer
  • Novel positive electrode isolation layer applied to lithium-sulfur battery, and preparation method for novel positive electrode isolation layer

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Effect test

Embodiment 1

[0025] Nickel nitrate and hexamethylenetetramine are dissolved in deionized water at a mass ratio of 1:4, and the concentration of nickel nitrate is 0.5mol / L; ) placed in the above solution, reacted in a hydrothermal kettle for 10 hours, and the reaction temperature was controlled at 100°C; after the reaction was completed, the bacterial cellulose was quickly frozen with liquid nitrogen to maintain its shape, and then placed in a freeze dryer for freeze-drying; after drying The bacterial cellulose was reacted in a muffle furnace at 300°C for 3 hours; finally, the bacterial cellulose was carbonized in a tube furnace protected by argon for 4 hours, the carbonization temperature was set at 900°C, and the heating rate of the above two steps was set at 5°C / min. Obtain the functional interlayer (wherein nickel oxide content is 12%wt, figure 1 It is the SEM photo of the interlayer, and the nanoscale network structure is clearly seen), which is cut into the size of the separator and ...

Embodiment 2

[0027] Cobalt nitrate and hexamethylenetetramine are dissolved in deethylene glycol in a mass ratio of 1:5, and the concentration of cobalt nitrate is 1mol / L; 10) Place in the above solution, react in a hydrothermal kettle for 4 hours, and control the reaction temperature at 80°C; after the reaction is completed, the bacterial cellulose is quickly frozen with liquid nitrogen to maintain its shape, and then placed in a freeze dryer to freeze-dry; dry The final bacterial cellulose was reacted in a muffle furnace at 250 °C for 1 h; finally, the bacterial cellulose was carbonized in a tube furnace protected by argon for 2 h, and the carbonization temperature was set at 1000 °C. The heating rate of the above two steps Set to 4°C / min. Obtain a functional interlayer coated with cobalt oxide (the content of cobalt oxide is 15%wt), cut it into the size of the diaphragm and place it between the diaphragm and the positive electrode material, assemble it into a battery, and test its elect...

Embodiment 3

[0029] Manganese oxalate and ammonia water were dissolved in deethylene glycol at a mass ratio of 1:6, and the concentration of manganese oxalate was 2mol / L; the bacterial cellulose (mass ratio with deionized water was about 1:12) was placed in In the above solution, react in a hydrothermal kettle for 4 hours, and the reaction temperature is controlled at 60°C; after the reaction is completed, the bacterial cellulose is quickly frozen with liquid nitrogen to maintain its shape, and then placed in a freeze dryer to freeze-dry; the dried bacterial cellulose The element was reacted in a muffle furnace at 100 °C for 4 h; finally, the bacterial cellulose was carbonized in a tube furnace protected by argon for 5 h, the carbonization temperature was set at 700 °C, and the heating rate of the above two steps was set at 7 °C / min. Obtain a functionalized interlayer coated with manganese oxide (manganese oxide content is 16%wt), cut it into the size of the diaphragm and place it between...

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Abstract

The invention relates to an isolation layer applied to a lithium-sulfur battery, and a preparation method for the isolation layer. According to the preparation method, metal oxide is attached to fiber surface of bacterial cellulose to be carbonized to obtain a novel positive electrode isolation layer. The isolation layer can be used between a positive electrode and a diaphragm of the lithium-sulfur battery to well suppress shuttling of polysulfide ions, and the metal oxide in the isolation layer also can adsorb the polysulfide ions; and meanwhile, the metal oxide also has certain catalytic action on the redox reaction of the lithium-sulfur battery, so that an important role in improving the cycling performance of the lithium-sulfur battery is played.

Description

technical field [0001] The invention relates to a novel positive electrode separator applied to lithium-sulfur batteries and a preparation method thereof, belonging to the field of chemical power sources. Background technique [0002] The energy crisis in today's society is getting more and more serious, and people's demand for new energy is getting higher and higher; with the development of electric vehicles and mobile portable devices, the requirements for secondary batteries are also getting higher and higher. Lithium-sulfur battery has high specific capacity (1675mAh / g) and high specific energy (2600Wh / kg) due to its active material elemental sulfur, and elemental sulfur has the advantages of abundant resources, low cost, environment-friendly, safe and reliable, etc., has extensive research and application prospects. However, the active materials of lithium-sulfur batteries have poor conductivity, and the intermediate polysulfides in the charging and discharging process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/483
CPCH01M10/0525H01M50/40H01M50/431Y02E60/10
Inventor 逯峰王安邦王维坤金朝庆苑克国赵秀英
Owner NO 63971 TROOPS PLA
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