Nanometer zinc oxide/porous carbon in-situ composite high-capacity lithium ion battery material and preparation method thereof

An in-situ composite material, nano-zinc oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of increasing specific surface area, improving electrical conductivity, slowing expansion and shrinkage

Inactive Publication Date: 2017-12-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a nano-zinc oxide/porous carbon in-situ composite high-capacity lithium-ion battery material and its preparation method. The method does not requi

Method used

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  • Nanometer zinc oxide/porous carbon in-situ composite high-capacity lithium ion battery material and preparation method thereof
  • Nanometer zinc oxide/porous carbon in-situ composite high-capacity lithium ion battery material and preparation method thereof
  • Nanometer zinc oxide/porous carbon in-situ composite high-capacity lithium ion battery material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] First, the molar ratio of Zn 2+ :C 6 h 5 o 7 3- Weigh 4.09g of anhydrous zinc chloride and 5.88g of trisodium citrate dihydrate for 3:2, dissolve them in 20mL of deionized water respectively to obtain zinc chloride solution and sodium citrate solution, and mix the two evenly to obtain a mixed solution. Then, the mixed solution with 20 mL of absolute ethanol was placed in a 60°C constant temperature water bath, and kept under stirring reaction conditions for 30 minutes. The obtained reaction precipitate was soaked with absolute ethanol / deionized water for 3 times, and zinc citrate was obtained by freeze-drying. Then put the zinc citrate into the crucible, place it in a horizontal tube furnace, raise it from room temperature to 700ºC at a rate of 5ºC / min under argon gas, keep it warm for 3 hours, and cool it down to room temperature naturally. The final carbonized product is nano Zinc oxide / porous carbon in situ composites.

[0029] The active material is nano zinc o...

Embodiment 2

[0040] First, the molar ratio of Zn 2+ :C 6 h 5 o 7 3- Weigh 4.09g of anhydrous zinc chloride and 5.88g of trisodium citrate dihydrate for 3:2, dissolve them in 20mL of deionized water respectively to obtain zinc chloride solution and sodium citrate solution, and mix the two evenly to obtain a mixed solution. Then, the mixed solution with 20 mL of absolute ethanol was placed in a 60°C constant temperature water bath, and kept under stirring reaction conditions for 10 minutes. The obtained reaction precipitate was soaked with absolute ethanol / deionized water for 3 times, and zinc citrate was obtained by freeze-drying. Then put the zinc citrate into the crucible, place it in a horizontal tube furnace, raise it from room temperature to 600ºC at a rate of 5ºC / min under argon gas, keep it warm for 1h, and cool it down to room temperature naturally, and the final carbonized product is nano Zinc oxide / porous carbon in situ composites.

[0041] The active material is nano zinc ox...

Embodiment 3

[0046] First, the molar ratio of Zn 2+ :C 6 h 5 o 7 3- Weigh 4.09g of anhydrous zinc chloride and 5.88g of trisodium citrate dihydrate for 3:2, dissolve them in 20mL of deionized water respectively to obtain zinc chloride solution and sodium citrate solution, and mix the two evenly to obtain a mixed solution. Then, the mixed solution with 20 mL of absolute ethanol was placed in a 60°C constant temperature water bath, and kept under stirring reaction conditions for 2 hours, and the obtained reaction precipitate was soaked with absolute ethanol / deionized water for 3 times, and zinc citrate was obtained by freeze-drying. Then put the zinc citrate into the crucible, place it in a horizontal tube furnace, raise it from room temperature to 700ºC at a rate of 5ºC / min under argon gas, keep it warm for 2 hours, and cool it down to room temperature naturally. The final carbonized product is nano Zinc oxide / porous carbon in situ composites.

[0047] The active material is nano zinc ...

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Abstract

The invention discloses a nanometer zinc oxide/porous carbon in-situ composite high-capacity lithium ion battery material and a preparation method thereof, and belongs to the technical field of production of an electrode material. The preparation method comprises the steps of preparing a zinc citrate precursor by taking zinc chloride and sodium citrate as raw materials and by employing a deposition method, and obtaining the nanometer zinc oxide/porous carbon in-situ composite material by a direct carbonization method. In the nanometer zinc oxide/porous carbon in-situ composite prepared according to the method, the zinc citrate is formed from citrate radicals and zinc ions in a complexing mode, the zinc ions are controlled on an in-situ site to generate zinc oxide, the citrate radicals are decomposed to generate a porous carbon material, and finally, the nanometer zinc oxide/porous carbon in-situ composite material of which the nanometer zinc oxide is uniformly dispersed in porous carbon and which is provided with an in-situ composite structure is formed. By the nanometer zinc oxide/porous carbon in-situ composite material, the problem of capacity attenuation caused by volume effect of the zinc oxide and low conductivity can be effectively solved, so that high specific capacity, favorable circulation and rate performance can be achieved.

Description

technical field [0001] The invention relates to a nano-zinc oxide / porous carbon in-situ composite high-capacity lithium-ion battery material and a preparation method thereof, belonging to the technical field of electrode material production. Background technique [0002] As a typical semiconductor oxide, ZnO has a high theoretical specific capacity (~978mAh / g). However, when actually used as anode materials, there are problems such as low electronic conductivity and significant volume effect (~220%) during charge and discharge, resulting in significant capacity fading and poor cycle performance. At present, the research on zinc oxide anode materials is mainly through the coating and modification of carbon materials to improve the conductivity and improve the volume effect. Chinese patent 201410238248.1 discloses a preparation method of zinc oxide / graphene composite material for lithium-ion batteries, and Chinese patent 201310665385.9 discloses a high-capacity lithium-ion ba...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M4/42H01M10/0525
CPCH01M4/362H01M4/42H01M4/483H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李峻峰赵瑞兰高阳何欢刘磊包珊珊张佩聪赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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