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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in controlling alloy size dispersion, and achieve good cycle stability, improved rate performance, and high specific capacity.

Inactive Publication Date: 2018-07-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this process, it is difficult to control the size of the alloy as well as the dispersion

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh 1.2g of cobalt nitrate hexahydrate, add it into 100mL of methanol and stir until it becomes clear. Dissolve 1.4g of the ligand 2-methylimidazole in 100mL of methanol and stir until clear. The above two solutions were mixed and reacted at room temperature for 24h. The product was centrifuged to obtain a purple precipitate. Centrifuge and wash 3 times with ethanol. Vacuum drying at 100 °C for 8 h yielded Co-MOF.

[0024] 2) Weigh 1g of tin tetrachloride pentahydrate, dissolve it in 500 microliters of ethanol, and add it to 500mg of the Co-MOF obtained in step 1). The resulting mixed solution was calcined in air at 180°C for 4h.

[0025] 3) The mixture obtained in step 2) was raised to 550° C. at a heating rate of 5° C. per minute under an argon atmosphere, and kept for 4 hours. After cooling, the nanometer tin-cobalt alloy / carbon composite material is obtained.

[0026] The overall morphology of the obtained composite material is as follows figure 1 shown....

Embodiment 2

[0029] 1) Weigh 1.2g of cobalt nitrate hexahydrate, add it into 100mL of methanol and stir until it becomes clear. Dissolve 1.4g of the ligand 2-methylimidazole in 100mL of methanol and stir until clear. The above two solutions were mixed and reacted at room temperature for 24h. The product was centrifuged to obtain a purple precipitate. Centrifuge and wash 3 times with ethanol. Vacuum drying at 100 °C for 8 h yielded Co-MOF.

[0030] 2) Weigh 500 mg of tin dichloride and dissolve it in 500 microliters of ethanol, and add it to 500 mg of Co-MOF obtained in step 1). The resulting mixed solution was calcined in air at 180°C for 4h.

[0031] 3) The mixture obtained in step 2) was raised to 550° C. at a heating rate of 5° C. per minute under an argon atmosphere, and kept for 4 hours. After cooling, the nanometer tin-cobalt alloy / carbon composite material is obtained.

[0032] The resulting nano-SnCo alloy / carbon composites were tested at 100 mA g -1 The first reversible cap...

Embodiment 3

[0034] 1) Weigh 1.2g of cobalt nitrate hexahydrate, add it into 100mL of methanol and stir until it becomes clear. Dissolve 1.4g of the ligand 2-methylimidazole in 100mL of methanol and stir until clear. The above two solutions were mixed and reacted at room temperature for 24h. The product was centrifuged to obtain a purple precipitate. Centrifuge and wash 3 times with ethanol. Vacuum drying at 100 °C for 8 h yielded Co-MOF.

[0035]2) Weigh 500 mg of tin dichloride and dissolve it in 500 microliters of ethanol, and add it to 500 mg of Co-MOF obtained in step 1). The resulting mixed solution was calcined in air at 180°C for 4h.

[0036] 3) The mixture obtained in step 2) was raised to 700° C. at a heating rate of 5° C. per minute under an argon atmosphere, and kept for 2 hours. After cooling, the nanometer tin-cobalt alloy / carbon composite material is obtained.

[0037] The resulting nano-SnCo alloy / carbon composites were tested at 100 mA g -1 The first reversible capa...

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Abstract

The invention provides a tin-based alloy / carbon composite material for a lithium ion battery negative electrode material and a preparation method thereof. Metal salt and organic ligands are stirred and dissolved in a solvent according to a certain proportion; normal temperature or solvent heat reaction is performed for preparing a porous MOF (metal-organic framework); tin salt is added into the MOF, so that the tin salt is fully adsorbed; MOF precursor powder containing the tin salt is calcined in air; carbonization is performed in inert gas to obtain a nanometer tin cobalt alloy / carbon composite material. The appearance of the prepared nanometer tin cobalt alloy / carbon composite material is a regular polyhedral spherical shape; the nanometer tin alloy size is smaller than 10nm; the material is uniformly dispersed in a porous polyhedral carbon base body. When the material is used for a lithium ion battery negative electrode, high reversible capacity, good cycling stability and high-rate performance are realized.

Description

technical field [0001] The invention relates to lithium-ion battery negative electrode materials, in particular to an alloy / carbon composite material and a preparation method for in-situ synthesis of nano-tin-based alloy / carbon composite materials for lithium-ion batteries using an organic metal framework material as a template. Background technique [0002] As the most widely used secondary battery at present, lithium-ion battery has many advantages such as high energy density, many cycles, no memory effect, good safety performance, and environmental friendliness. The anode material is one of the keys to the development of lithium-ion batteries. At present, the wide application of graphite-based anode materials in lithium-ion batteries is mainly based on its high Coulombic efficiency and excellent cycle performance. However, due to the limitation of its own low lithium storage capacity (372 mA h g -1 , LiC 6 ), has gradually been unable to meet the requirements of high-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395H01M4/362H01M4/366Y02E60/10
Inventor 宋怀河史骁李昂陈晓红
Owner BEIJING UNIV OF CHEM TECH
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