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Li/Na battery anode material zno/tio2/c core-shell structure and preparation

A sodium-ion battery, core-shell structure technology, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of reducing electrode cycle life, volumetric electrode material peeling, poor conductivity, etc., and achieve excellent electrochemical performance.

Active Publication Date: 2021-03-16
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with most transition metal oxides such as nickel oxide, ferroferric oxide and cobalt tetraoxide, etc., zinc oxide has a higher theoretical specific capacity due to the alloying process when it is used as a lithium and sodium ion battery material, but it also has poor conductivity. And during the charge-discharge cycle, the volume has a large expansion and contraction, which causes the electrode material to peel off, which reduces the cycle life of the electrode; titanium dioxide has the advantages of abnormal stability, non-toxicity, abundant resources and low price. It has great potential in the application of sodium ion batteries (Min Zhou, Yang Xu, Chengliang Wang, Qianwen Li, Junxiang Xiang, Liying Liang, Minghong Wu, Huaping Zhao, Yong Lei. AmorphousTiO 2 inverse opal anode for high-rate sodium ion batteries. Nano Energy, 2017, 31, 514-524)

Method used

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  • Li/Na battery anode material zno/tio2/c core-shell structure and preparation
  • Li/Na battery anode material zno/tio2/c core-shell structure and preparation
  • Li/Na battery anode material zno/tio2/c core-shell structure and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Get raw material cetyltrimethylammonium bromide, zinc nitrate hexahydrate, 2-methylimidazole and deionized water and mix, wherein the concentration of cetyltrimethylammonium bromide solution is 0.02mol / L, the zinc nitrate solution mass concentration is 0.002g / mL, and the 2-methylimidazole solution concentration is 0.02mol / L;

[0025] (2) Add the above-mentioned cetyltrimethylammonium bromide solution into the zinc nitrate solution, stir at 5°C for 10 minutes, add the 2-methylimidazole solution into the above solution, and continue stirring for 5 minutes to obtain a white emulsion;

[0026] (3) Place the above-mentioned emulsion in a reaction kettle, insulate it in an oven at 55°C for 1h, obtain ZIF-8 cubes after centrifugation, washing, and drying;

[0027] (4) Disperse the above 0.02g ZIF-8 in 15mL of absolute ethanol solution, the concentration of ZIF-8 in absolute ethanol solution is 0.02g / L, then add 0.02mL of deionized water, reflux in a water bath at 5°C, and...

Embodiment 2

[0030] (1) Get raw material cetyltrimethylammonium bromide, zinc nitrate hexahydrate, 2-methylimidazole and deionized water and mix, wherein the concentration of cetyltrimethylammonium bromide solution is 0.03mol / L, the mass concentration of zinc nitrate solution is 0.005g / mL, and the concentration of 2-methylimidazole solution is 0.05mol / L;

[0031] (2) Add the cetyltrimethylammonium bromide solution to the zinc nitrate solution, stir at 10°C for 10 minutes, add the 2-methylimidazole solution to the above solution, and continue stirring for 10 minutes to obtain a white emulsion;

[0032] (3) Place the above emulsion in a reaction kettle, heat it in an oven at 60°C for 1.5h, and obtain ZIF-8 cubes after centrifugation, washing and drying;

[0033](4) Disperse the above 0.03g ZIF-8 in 20mL absolute ethanol solution, the concentration of ZIF-8 in absolute ethanol solution is 0.03g / L, then add 0.05mL deionized water, reflux in water bath at 10°C, and dissolve 0.05mL Add tetrabu...

Embodiment 3

[0036] (1) Get raw material cetyltrimethylammonium bromide, zinc nitrate hexahydrate, 2-methylimidazole and deionized water and mix, wherein the concentration of cetyltrimethylammonium bromide solution is 0.05mol / L, the mass concentration of zinc nitrate solution is 0.002g / mL, and the concentration of 2-methylimidazole solution is 0.08mol / L;

[0037] (2) Add the cetyltrimethylammonium bromide solution to the zinc nitrate solution, stir at 10°C for 10 minutes, add the 2-methylimidazole solution to the above solution, and continue stirring for 3 minutes to obtain a white emulsion;

[0038] (3) The above-mentioned emulsion is placed in a reaction kettle, kept in an oven at 65° C. for 2 hours, and obtained ZIF-8 cubes after centrifugation, washing, and drying;

[0039] (4) Disperse the above 0.04g ZIF-8 in 25mL of absolute ethanol solution, the concentration of ZIF-8 in absolute ethanol solution is 0.04g / L, then add 0.07mL of deionized water, reflux in the water bath at 15°C, and...

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Abstract

The invention relates to an ion battery anode material, in particular to lithium / sodium ion battery anode material ZnO / TiO2 / C core-shell structure and preparation. The lithium / sodium ion battery anodematerial ZnO / TiO2 / C core-shell structure is a cubic core-shell structure. The preparation includes: mixing cetyl trimethyl ammonium bromide, zinc nitrate hexahydrate and 2-methylimidazole respectively with water; adding cetyl trimethyl ammonium bromide solution into zinc nitrate hexahydrate solution, stirring, adding 2-methylimidazole solution to obtain white emulsion, drying, separating by centrifuging, washing, drying to obtain ZIF-8 cubes, dispersing in a solvent, adding water, performing bath refluxing, adding tetrabutyl titanate solution, continuing to perform refluxing, separating by centrifuging, washing, thermally treating to obtain ZnO / TiO2 core-shell structure, ultrasonically dispersing in tri(hydroxymethyl)aminomethane solution, adding dopamine hydrochloride, separating by centrifuging, washing, drying, and thermally treating to obtain a product.

Description

technical field [0001] The invention relates to ion battery negative electrode materials, in particular to a lithium / sodium ion battery negative electrode material ZnO / TiO 2 / C core-shell structure and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life, high rated voltage, low self-discharge rate, green environmental protection and light weight. They are ideal for mobile phones, notebook computers, digital cameras, electric vehicles and various portable instruments and equipment. Power supply; Sodium is one of the more abundant elements on the earth (Shuya Wei, Snehashis Choudhury, Jun Xu, Pooja Nath, Zhengyuan Tu, and Lynden A. Archer. Highly stable sodium batteries enabled by functional ionic polymer membranes. Advanced Materials, 2017, 29, 1605512-1605519), which have chemical properties similar to lithium and thus may also be applicable to lithium-ion battery systems. Compared with l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/62
CPCH01M4/366H01M4/48H01M4/485H01M4/625Y02E60/10
Inventor 李剑锋钟晓斌王晓晓蒋玉雄
Owner XIAMEN UNIV