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Preparation method of ZnO/C nano composite microsphere material with capsule structure

A technology of nanocomposite and composite materials, which is applied in the field of preparation of capsule structure ZnO/C nanocomposite microsphere materials, can solve the problems of small progress and achieve the effect of improving Coulombic efficiency, reducing the generation of SEI film and improving cycle stability

Inactive Publication Date: 2020-06-09
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with other transition metal oxide anode materials, relatively little progress has been made in the modification of ZnO materials.

Method used

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  • Preparation method of ZnO/C nano composite microsphere material with capsule structure

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Experimental program
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Effect test

Embodiment 1

[0020] (1) Under stirring conditions, prepare a mixed aqueous solution of zinc chloride, resorcinol, formaldehyde and hydrochloric acid. The concentrations of zinc chloride, resorcinol, formaldehyde and hydrochloric acid in the solution are 0.1 mol / L and 0.6 mol respectively / L, 1.2 mol / L and 0.06 mol / L, at 80 o Gel was obtained after reacting for 3 h under the water bath condition of C, and dried to obtain xerogel;

[0021] (2) Calcining the xerogel in an air atmosphere at a temperature of 387 o C, the heating rate is 2.5 o C / min, the calcination time is 4 h;

[0022] (3) The product obtained in step (2) is calcined in an argon atmosphere, and the calcining temperature is 750 o C, the calcination time is 3 h, and the capsule structure ZnO / C nanocomposite microsphere material is prepared.

[0023] In the capsule structure ZnO / C nanocomposite microsphere material of the present embodiment, the mass fraction of contained ZnO is 90%, and the mass fraction of contained amorpho...

Embodiment 2

[0027] (1) Under stirring conditions, prepare a mixed aqueous solution of zinc chloride, resorcinol, formaldehyde and hydrochloric acid. The concentrations of zinc chloride, resorcinol, formaldehyde and hydrochloric acid in the solution are 0.3 mol / L and 0.4 mol respectively / L, 0.8 mol / L and 0.06 mol / L, at 80 o Gel was obtained after reacting for 3 h under the water bath condition of C, and dried to obtain xerogel;

[0028] (2) Calcining the xerogel in an air atmosphere at a temperature of 387 o C, the heating rate is 2.5 o C / min, the calcination time is 5 h;

[0029] (3) The product obtained in step (2) is calcined in an argon atmosphere, and the calcining temperature is 750 o C, the calcination time is 3 h, and the capsule structure ZnO / C nanocomposite microsphere material is prepared.

[0030] In the capsule structure ZnO / C nanocomposite microsphere material of the present embodiment, the mass fraction of contained ZnO is 95%, and the mass fraction of amorphous C conta...

Embodiment 3

[0034] (1) Under stirring conditions, prepare a mixed aqueous solution of zinc chloride, resorcinol, formaldehyde and hydrochloric acid. The concentrations of zinc chloride, resorcinol, formaldehyde and hydrochloric acid in the solution are 0.1 mol / L and 0.8 mol respectively / L, 1.6 mol / L and 0.06 mol / L, at 80 o Gel was obtained after reacting for 3 h under the water bath condition of C, and dried to obtain xerogel;

[0035] (2) Calcining the xerogel in an air atmosphere at a temperature of 375 o C, the heating rate is 2.5 o C / min, the calcination time is 3 h;

[0036] (3) The product obtained in step (2) is calcined in an argon atmosphere, and the calcining temperature is 800 o C, the calcination time is 3 h, and the capsule structure ZnO / C nanocomposite microsphere material is prepared.

[0037] In the capsule structure ZnO / C nanocomposite microsphere material of the present embodiment, the mass fraction of contained ZnO is 80%, and the mass fraction of amorphous C conta...

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Abstract

The invention discloses a preparation method and application of a ZnO / C nano composite microsphere material with a capsule structure. The method comprises the steps of heating a mixed aqueous solutionof zinc chloride, resorcinol, formaldehyde and hydrochloric acid in a water bath to react to generate gel, fully drying the gel, calcining in an air atmosphere, and carbonizing in an argon atmosphereto obtain a product. When the ZnO / C nano composite microsphere material with the capsule structure is used as a negative electrode material of a lithium ion battery, the capsule microsphere structurecan effectively inhibit pulverization failure of a ZnO active material, reduce the generation of a solid electrolyte interface (SEI) film and improve the electrode reaction kinetic performance, thereby improving the cycling stability, Coulombic efficiency and high-rate capacity of the material.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrode materials, in particular to a preparation method and application of a capsule-structured ZnO / C nanocomposite microsphere material. Background technique [0002] As an important energy storage device in the field of new energy, lithium-ion batteries have developed rapidly due to their advantages such as high energy density, high power density and long cycle life. At present, they have occupied a dominant position in the secondary battery market. Products, electric vehicles and battery energy storage power stations have been widely used. [0003] The performance of electrode materials determines the performance of lithium-ion batteries. In terms of negative electrode materials, the graphite material used in commercial lithium-ion batteries has a low capacity (theoretical capacity is only 372 mAh / g). After years of development, its actual capacity has almost reached its limit. To make th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 黄小华吴建波钟文武申士杰郭仁青林燕
Owner TAIZHOU UNIV
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