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Anode material for lithium sulfur batteries and method for preparing anode material

A lithium-sulfur battery and cathode material technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem of active sulfur loss and other problems, and achieve the effects of preventing volume expansion, increasing capacity, and improving transmission efficiency

Active Publication Date: 2017-05-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the prior art, to provide a lithium-sulfur battery cathode material, which can effectively solve the problems of the loss of active sulfur and the shuttle effect of the cathode material in the lithium-sulfur battery, improve the cycle stability of the battery, and The preparation method involved is simple and suitable for popularization and application

Method used

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  • Anode material for lithium sulfur batteries and method for preparing anode material
  • Anode material for lithium sulfur batteries and method for preparing anode material
  • Anode material for lithium sulfur batteries and method for preparing anode material

Examples

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Embodiment 1

[0035] A lithium-sulfur battery cathode material, the preparation method of which comprises the following steps:

[0036] 1) First weigh 19.8g of zinc acetate dihydrate and dissolve it in 300ml of water. Take another 30.6g of sodium hydroxide and dissolve it in 255ml of water. After cooling, mix and stir the two solutions. After the mixed solution is clarified, put it in the reaction kettle , heated to 90°C for 20 minutes, removed, filtered and dried to obtain flower-shaped zinc oxide (flower-shaped ZnO);

[0037] 2) Put 1g of mesoporous pore-forming agent P123 and 1g of flower-shaped zinc oxide into 500ml of water for ultrasonic dispersion for 15min, then add 0.6g of Tris, stir for 20min, then add 1g of dopamine hydrochloride, stir for 12h Mixing coating reaction (temperature is 24°C), suction filtration and drying to obtain solid product I;

[0038] 3) Dissolve 1g of solid product I in 500ml of water, add 0.05g of microporous template agent SDS and mix well by ultrasonicati...

Embodiment 2

[0044] A lithium-sulfur battery cathode material, the preparation method of which comprises the following steps:

[0045] 1) First weigh 13.2g of zinc acetate dihydrate and dissolve it in 200ml of water. Take another 20.4g of sodium hydroxide and dissolve it in 170ml of water. After cooling, mix and stir the two solutions. After the mixed solution is clarified, put it in the reaction kettle , heated to 90°C for 20 minutes, removed, filtered and dried to obtain flower-shaped zinc oxide (flower-shaped ZnO);

[0046] 2) Put 1g of mesoporous template agent P123 and 1g of flower-like zinc oxide into 500ml of water for ultrasonic dispersion for 15min, then add 0.6g of Tris, stir for 20min, then add 1g of dopamine hydrochloride, stir for 13h to mix Coating reaction (temperature is 24°C), suction filtration and drying to obtain solid product I;

[0047] 3) Dissolve 1g of solid product I in 500ml of water, add 0.05g of microporous template agent SDS and ultrasonically mix for 15min, the...

Embodiment 3

[0053] A lithium-sulfur battery cathode material, the preparation method of which comprises the following steps:

[0054] 1) First weigh 6.6g of zinc acetate dihydrate and dissolve it in 100ml of water. Take another 10.2g of sodium hydroxide and dissolve it in 85ml of water. After cooling, mix and stir the two solutions. After the mixed solution is clarified, put it in the reaction kettle , heated to 90°C for 20 minutes, removed, filtered and dried to obtain flower-shaped zinc oxide (flower-shaped ZnO);

[0055] 2) Put 1g of mesoporous pore-forming agent P123 and 1g of flower-like zinc oxide into 500ml of water for ultrasonic dispersion for 15min, then add 0.6g of Tris, stir for 20min, then add 1g of dopamine hydrochloride, stir for 13h Mixing coating reaction (temperature is 23°C), suction filtration and drying to obtain solid product I;

[0056] 3) Dissolve 1g of solid product I in 500ml of water, add 0.05g of microporous template agent SDS and ultrasonically mix for 15min,...

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Abstract

The invention discloses an anode material for lithium sulfur batteries and a method for preparing the anode material. The method includes compounding flower-like zinc oxide and polydopamine under the effect of template agents to prepare polydopamine / flower-like zinc oxide; carrying out carbonization and acid treatment on the polydopamine / flower-like zinc oxide to form three-dimensional flower-like carbon structures; filling the obtained three-dimensional flower-liked carbon structures with sulfur; coating a layer of conductive polymers PDA (polydopamine) on obtained carbon sulfur composite materials. The three-dimensional flower-like carbon structures are used as carriers. The anode material and the method have the advantages that the electrochemical performance and the stability of elemental sulfur which is used as the anode material for the lithium sulfur batteries can be effectively improved; the anode material for the lithium sulfur batteries has flower-like morphology, accordingly, the specific surface area can be effectively increased, and the anode material can be in sufficient contact with electrolyte; the sulfur can be supported by hierarchical holes of the formed three-dimensional flower-like carbon structures, the conductive polymers can be coated by the hierarchical holes, accordingly, loss of polysulfide can be effectively inhibited, and the conductivity and the cyclic stability of electrodes can be improved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] The main limiting factor in the performance of current rechargeable batteries is the low capacity of the cathode. The theoretical capacity of sulfur is 1675mAh / g, which is much higher than that of lithium cobalt oxide batteries (<150mAh / g), which are widely used commercially. It is currently the cathode material for lithium secondary batteries with the highest energy density except oxygen. In addition, lithium-sulfur batteries have the characteristics of high energy density, excellent safety, environmental protection and low cost, which can better meet the requirements of future power batteries and have broad application prospects. [0003] At present, lithium-sulfur batteries mainly have the following problems: first, the conductivity of elemental sulf...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/62H01M4/624H01M4/628H01M10/052H01M2004/021Y02E60/10
Inventor 陈丽华寇柱王志豪蔡昌吴攀余勇苏宝连
Owner WUHAN UNIV OF TECH
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