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sno based on three-dimensional carbon sphere frame structure 2 , mno or mn 3 o 4 Matrix composite material and its preparation method

A frame structure and composite material technology, applied to structural parts, electrical components, electrochemical generators, etc., can solve problems such as difficulty in maintaining long-life cycle, short-circuit safety of lithium dendrites, complex synthesis process, etc., and achieve superior cycle performance and The rate performance, the preparation method is simple and convenient, and the effect of good lithium ion diffusion coefficient

Inactive Publication Date: 2017-02-08
HUAZHONG NORMAL UNIV
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Problems solved by technology

) and other characteristics, it is the star of the new generation of lithium-ion battery anode materials, but these metal oxides have a fatal shortcoming in addition to their low electrical conductivity: the volume expansion is relatively large during the insertion and extraction of lithium ions. Large, even lead to lattice collapse, material pulverization, resulting in short cycle life, difficult to practical production and application
Graphite carbon materials are currently commonly used negative electrode materials, but they are easy to form lithium dendrites during charging and discharging, which may pierce the battery diaphragm and cause a short circuit, causing safety hazards. The capacitance is low (theoretical reversible capacity is 372mAh / g), especially large Rate charge and discharge process
In recent years, there have been more and more studies on the preparation of metal oxide and carbon composite materials and their application in lithium-ion battery anode materials. However, these simple methods of growing metal oxides on carbon materials, or carbon materials Coating on metal oxides, or even mixing the two methods can not solve the problem of large volume expansion of metal oxides.
At present, the composite material of graphene and metal oxide is more attractive, which has excellent electrochemical properties, but its synthesis process is complicated and the cost is high, which only delays the volume expansion of metal oxide to a certain extent, but It is still difficult to maintain a long life cycle of more than 300 times

Method used

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  • sno based on three-dimensional carbon sphere frame structure <sub>2</sub> , mno or mn <sub>3</sub> o <sub>4</sub> Matrix composite material and its preparation method
  • sno based on three-dimensional carbon sphere frame structure <sub>2</sub> , mno or mn <sub>3</sub> o <sub>4</sub> Matrix composite material and its preparation method
  • sno based on three-dimensional carbon sphere frame structure <sub>2</sub> , mno or mn <sub>3</sub> o <sub>4</sub> Matrix composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This example prepares SnO 2 With the composite material of carbon, its method step is as follows:

[0048] (1) Preparation of colloidal carbon spheres: put 70mL of 1.2M (1M=1mol / L) glucose aqueous solution in a hydrothermal reaction kettle with a capacity of 100mL and react at 180°C for 5 hours, wash and centrifuge the product to obtain brown-black colloidal carbon spheres; other conditions remain unchanged, the morphology of colloidal carbon spheres prepared by replacing 1.2M glucose aqueous solution with 1.8M glucose aqueous solution and 0.5M sucrose aqueous solution is shown in Figure 22 .

[0049] (2) Preparation of activated colloidal carbon spheres: Weigh 1g of the colloidal carbon spheres prepared in the above step (1), add them to 80mL of 1M HCl, activate them at 100°C under normal pressure for 12h, and wash and dry the obtained product to obtain Acid activated colloidal carbon spheres. SEM test shows that the carbon spheres are uniform microspheres with a d...

Embodiment 2

[0061] This embodiment prepares the composite material of MnO and carbon, and its method step is as follows:

[0062] (1) Preparation of colloidal carbon spheres: put 70mL of 1.8M glucose aqueous solution in a hydrothermal reactor with a capacity of 100mL and react at 180°C for 5 hours, wash and centrifuge the product to obtain brown-black colloidal carbon spheres;

[0063] (2) Preparation of activated colloidal carbon spheres: Weigh 1g of the colloidal carbon spheres prepared above, add 80mL 1MNH 3 ·H 2 In O, activation treatment at 100°C under normal pressure for 12 hours, after washing and drying the obtained product, the alkaline activated colloidal carbon spheres can be obtained;

[0064] (3) Preparation of composite materials of MnO and carbon: Weigh 0.3g of alkaline activated colloidal carbon spheres prepared above, add to 0.5M MnCl 2 In 80mL ethanol aqueous solution system (the volume ratio of water and ethanol is 1:1), the reaction was carried out in a water bath at...

Embodiment 3

[0068] This example prepares SnO 2 With the composite material of carbon, its method step is as follows:

[0069] (1) Preparation of colloidal carbon spheres: put 70mL of 0.5M sucrose aqueous solution in a hydrothermal reactor and react at 130°C for 12 hours, wash and centrifuge the resultant to obtain brown-black colloidal carbon spheres;

[0070] (2) Preparation of activated colloidal carbon spheres: Weigh 1g of the colloidal carbon spheres prepared above, add 80mL 0.1M HNO 3 , activated under normal pressure at 50°C for 24 hours, and after washing and drying the obtained product, acidic activated colloidal carbon spheres can be obtained;

[0071] (3) Preparation of SnO 2 Composite material with carbon: Weigh 0.3g of acid activated colloidal carbon spheres prepared above, add to 2 and 0.2M SnCl 4 In 80mL ethanol aqueous solution system (the volume ratio of water and ethanol is 1:5), react in a water bath at 90°C for 3h, and the process is completed under constant stirrin...

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Abstract

The invention relates to a SnO2, MnO or Mn3O4-based composite material based on a three-dimensional carbon sphere framework structure and a preparation method of the material. The SnO2, MnO or Mn3O4-based composite material consists of microspheres formed by SnO2, MnO or Mn3O4 metal oxides packaged by crystallized carbon and amorphous carbon which are distributed in a crossing manner, wherein the diameter of the composite material is 100nm-800nm, and the particle diameters of metal oxides are 2nm-50nm. The composite material prepared by virtue of the preparation method has excellent electrochemical performance, particularly, the three-dimensional carbon sphere framework structure has a large space to allow volume expansion of stannic oxide or manganese oxide in lithium embedding and removing processes, besides, crystallized carbon which packages stannic oxide or manganese oxide particles and is distributed in the crossing manner can be bent during the volume expansion, and amorphous carbon around crystallized carbon is further compressed, so that the composite material has high toughness, the structural stability is guaranteed, and the cycling stability of the composite material is good.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a SnO battery based on a three-dimensional carbon sphere frame structure 2 , MnO or Mn 3 o 4 Composite materials and methods for their preparation. Background technique [0002] Metal oxides such as tin dioxide and manganese monoxide are rich in reserves, cheap, high energy density, and high capacitance (for example, the theoretical reversible capacity of tin dioxide is 993mAh / g, and that of manganese monoxide is 755mAh / g.) It is the star of the new generation of lithium-ion battery anode materials, but these metal oxides have a fatal shortcoming in addition to their low electrical conductivity: large volume expansion during the insertion and extraction of lithium ions , and even lead to lattice collapse, material pulverization, resulting in short cycle life, difficult to practical production and application. Graphite carbon materials are currently commonly used negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/62
CPCH01M4/366H01M4/483H01M4/502H01M4/625H01M10/0525Y02E60/10
Inventor 余颖胡浩邱明强
Owner HUAZHONG NORMAL UNIV
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