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Preparation method of positive electrode material used for lithium-sulfur batteries

A cathode material, lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems affecting the actual specific capacity of the battery cycle life, reduce the battery charge-discharge cycle performance, high sulfur loading, etc., and achieve excellent cycle stability and excellent electrochemical performance. performance, the effect of improving conductivity

Active Publication Date: 2018-11-13
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing technology of the titanium dioxide / sulfur composite positive electrode material has improved the electrochemical performance of the lithium-sulfur battery to a certain extent, it has its defects: the sulfur-carrying process of using carbon fiber cloth to absorb gas sulfur during sulfur doping is difficult to realize Higher sulfur loading, the level of sulfur loading directly affects the cycle life of the battery and the actual specific capacity per unit mass of the device in the application process
At the same time, the structure of titanium dioxide-coated carbon fiber is carbon inside and oxide outside. The role of conductive carbon material in this structure is reduced, and the conductivity is poor, which will also reduce the charge-discharge cycle performance of the battery.

Method used

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  • Preparation method of positive electrode material used for lithium-sulfur batteries
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  • Preparation method of positive electrode material used for lithium-sulfur batteries

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Experimental program
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Embodiment 1

[0037] The first step, the preparation of graphene oxide:

[0038] Graphene oxide was prepared by improving the Hummers method;

[0039] The second step, the preparation of titanium dioxide balls:

[0040] Add deionized water to a certain volume of ethanol liquid, the volume ratio of water and ethanol is 1:100, then add 0.1% volume of mercaptopropionic acid corresponding to the alcohol-water mixed solution to the alcohol-water mixed solution as an initiator, stir evenly, Then add the titanium precursor corresponding to 5% of the alcohol-water mixed solution dropwise through a dropper. Put the above solution on a heated magnetic stirrer for reaction, the reaction temperature is 100°C, and the reaction time is 4 hours. After the reaction is completed, the product obtained is centrifuged at 6000 rpm for 3 times to remove the uneven particle size in the upper liquid. The particles are washed and dried to obtain titanium dioxide spheres.

[0041] The third step, the preparation ...

Embodiment 2

[0049] The first step, the preparation of graphene oxide:

[0050] Graphene oxide was prepared by improving the Hummers method;

[0051] The second step, the preparation of titanium dioxide balls:

[0052] Add deionized water to a certain volume of ethanol liquid, the volume ratio of water and ethanol is 1:150, then add 0.5% volume of mercaptopropionic acid corresponding to the alcohol-water mixed solution to the alcohol-water mixed solution as an initiator, and stir evenly , and then add dropwise the titanium precursor corresponding to 10% of the alcohol-water mixed solution through a dropper or other titration device. The above solution is placed on a heating type magnetic stirrer for reaction, the reaction temperature is 150°C, and the reaction time is 10 hours. After the reaction is completed, the product obtained is centrifuged at 4000 rpm for 3 times to remove particles with uneven particle size. Then wash and dry to obtain titanium dioxide balls.

[0053] The third s...

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Abstract

The invention discloses a preparation method of a positive electrode material used for lithium-sulfur batteries. The method comprises the following steps: step one, preparing oxidized graphene; step two, preparing a titanium dioxide ball; step three, preparing a graphene coated titanium dioxide ball; step four, preparing a graphene / titanium dioxide / sulfur positive electrode material, so as to prepare a positive electrode material used for graphene / titanium dioxide / sulfur compound three-dimensional structure lithium-sulfur batteries. The preparation method overcomes the defects of a sulfenyl positive electrode material such as low ionic conductivity, active substance diffusion and dissolution and volume expansion in the prior art, and feasible technical supports are provided for the research and commercialized development of the lithium-sulfur batteries.

Description

technical field [0001] The technical solution of the invention relates to an electrode material composed of active materials, specifically a method for preparing a positive electrode material of a lithium-sulfur battery, which belongs to the field of material chemistry. Background technique [0002] As renewable energy and new energy gradually replace the increasingly depleted fossil energy including oil, natural gas, and coal, the development and utilization of new energy storage equipment has become an effective means to solve the energy crisis in the world today. With the improvement of people's requirements for equipment performance, the traditional lithium-ion battery can no longer meet the demand, so the next-generation lithium-ion battery with high specific capacity, high safety, long service life and low cost has become a research hotspot. As the most promising lithium secondary battery, the theoretical specific energy of the new lithium-sulfur battery is 2600Wh / kg, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 张永光孙连城
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN