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Lithium sulfur battery cathode material hollow vanadium dioxide/sulfur composite and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of lithium storage window conversion mismatch, volume specific capacity needs to be improved, limit energy density increase, etc., to achieve high uniformity, conductivity Good performance, good for the effect of diffusion

Inactive Publication Date: 2019-01-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low-density characteristics of carbon-based materials and the mismatch between the lithium storage window and the conversion of sulfur, the specific capacity, especially the volumetric specific capacity, of lithium-sulfur battery cathode materials still needs to be improved, which has become the key to limit the increase in energy density.

Method used

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  • Lithium sulfur battery cathode material hollow vanadium dioxide/sulfur composite and preparation method thereof
  • Lithium sulfur battery cathode material hollow vanadium dioxide/sulfur composite and preparation method thereof
  • Lithium sulfur battery cathode material hollow vanadium dioxide/sulfur composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Weigh 1.2g V respectively 2 o 5 And 2.495g dihydrate oxalic acid solid in a 100mL beaker, add 40mL deionized water to dissolve. Stir at 80 degrees Celsius for 12 hours to synthesize VOC 2 o 4 solution. During the mixing process, seal the upper opening with plastic wrap, and poke a few holes to maintain the balance of internal and external air pressure. When the reaction was over, the solution turned dark blue. Take the prepared VOC 2 o 4 3 mL of the solution was mixed with 30 mL of isopropanol and stirred for 20 minutes, and reacted in an electric oven at 200 degrees Celsius. After solvothermal reaction for 12 hours, the hollow structure VO was obtained 2 . will VO 2 Weigh it with sulfur powder according to the mass ratio of 1:3, grind and mix evenly in a mortar

[0044] Under 0.2C, four kinds of positive electrode materials were tested cyclically in the electrode, and only the hollow structure VO 2 / S has a high initial discharge specific capacity of 1160mA...

Embodiment 2

[0047] Step is the same as embodiment 1, and difference is that VO in embodiment 1 2 The mass ratio of sulfur powder and sulfur powder is changed to 1:2. VO 2 When the / S composite material is used as the positive electrode material of lithium-sulfur battery, its specific capacity is 840mAh g -1 .

Embodiment 3

[0049] The steps are the same as in Example 1, except that the solvothermal reaction time in Example 1 is changed to 4 hours. VO 2 When the / S composite material is used as the positive electrode material of lithium-sulfur battery, its specific capacity is 410mAh g -1 .

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Abstract

The invention relates o a lithium sulfur battery cathode material hollow vanadium dioxide / sulfur composite and a preparation method thereof. The compiste is prepare from hollow VO2 as shell layer, elemental sulfur is carried in shell layer with elemental sulfur content of 10-80wt%. Compared with the prior art, the method of the invention is simple, the design is clever, and the prepared material has good reversibility and stability. the composite has -high practical application prospect.

Description

technical field [0001] The invention relates to a high-performance lithium-sulfur battery positive electrode material, in particular to a hollow vanadium dioxide / sulfur composite and a preparation method thereof. Background technique [0002] Secondary batteries, as devices that convert electrical energy into chemical energy and store them therein, play a vital role in storing renewable energy. Compared with commercial batteries such as traditional lead-acid batteries and nickel-metal hydride batteries, lithium secondary batteries have the advantages of long cycle life, high voltage, clean and pollution-free, and have received widespread attention. The cathode materials currently available for commercial lithium batteries include lithium cobaltate, lithium manganate, lithium iron phosphate, etc., and their theoretical specific capacity is 120-200mAh g -1 about. The actual energy density of the battery is limited by the theoretical energy of the material, and it is difficul...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/58
CPCH01M4/366H01M4/48H01M4/5815Y02E60/10
Inventor 宰建陶周玲钱雪峰姚琳刘雪娇
Owner SHANGHAI JIAO TONG UNIV
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