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Tin dioxide/porous carbon composite lithium battery negative electrode material and preparation method

A battery negative electrode, tin dioxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance, easy pulverization of negative electrode materials, poor conductivity, etc., and achieve long cycle life, good uniformity and stability. high yield effect

Inactive Publication Date: 2018-01-19
赵兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem hindering its practical application is that it will have a large volume change (300%) during the cycle charge and discharge process, and the negative electrode material is easy to pulverize, resulting in poor cycle performance.
In addition, this kind of metal oxide also has the common problem of poor conductivity, which is also an important factor affecting its practical application (Zhao Shuping, Wang Chan, Yang Zhenglong, Jiang Wei. Research progress of tin dioxide as a negative electrode material for lithium-ion batteries[J] . Materials Herald, 2016,30(01):136-142; Ruiping Liu, Weiming Su, Jiaxin Li, Chao Shen, Chao Zhang, Peng He, Qi Wang. SnO 2 Research progress of anode materials for lithium-ion batteries[J]. Science and Technology Herald, 2017,35(08):60-69)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Prepare a silk fibroin aqueous solution with a mass fraction of 1%, slowly add 10g / L PAMAM aqueous solution, wherein the mass ratio of silk fibroin to PAMAM is 5:1, stir and react at a constant speed at 80°C for 24h, then pour it into a mold, and place in- After pre-freezing in a refrigerator at 25°C for 12 hours, put it into a freeze dryer for 48 hours to obtain a silk fibroin / PAMAM composite material; impregnate the above silk fibroin / PAMAM composite material in 1% stannous sulfate (SnSO 4 ) in aqueous solution for 30 minutes, with a bath ratio of 1:30, rinsed with deionized water, and placed in a muffle furnace under the protection of argon for heat treatment at 200°C for 1 hour, where the heating rate was 5°C / min, and then heated to 400°C for heat treatment for 1 hour. The heating rate is 10° C. / min, and after natural cooling to room temperature, a tin dioxide / porous carbon composite lithium battery negative electrode material is obtained.

Embodiment 2

[0012] Prepare a silk fibroin aqueous solution with a mass fraction of 3%, slowly add 50g / L PAMAM aqueous solution, wherein the mass ratio of silk fibroin to PAMAM is 3:1, stir and react at a constant speed at 80°C for 24h, then pour it into a mold, and place in- After pre-freezing in a refrigerator at 25°C for 12 hours, put it into a freeze dryer for 48 hours to obtain a silk fibroin / PAMAM composite material; impregnate the above silk fibroin / PAMAM composite material in 3% stannous sulfate (SnSO 4 ) in an aqueous solution for 45 minutes, with a bath ratio of 1:30, rinsed with deionized water, and placed in a muffle furnace under the protection of argon for heat treatment at 200°C for 2 hours, where the heating rate was 5°C / min, and then heated to 420°C for 2 hours. The heating rate is 10° C. / min, and after natural cooling to room temperature, a tin dioxide / porous carbon composite lithium battery negative electrode material is obtained.

Embodiment 3

[0014] Prepare a silk fibroin aqueous solution with a mass fraction of 5%, slowly add 100g / L PAMAM aqueous solution, wherein the mass ratio of silk fibroin to PAMAM is 1:1, stir and react at a constant speed at 80°C for 24h, then pour it into a mold, and place in- After pre-freezing in a refrigerator at 25°C for 12 hours, put it into a freeze dryer for 48 hours to obtain a silk fibroin / PAMAM composite material; impregnate the above silk fibroin / PAMAM composite material in 5% stannous sulfate (SnSO 4 ) in an aqueous solution for 60 minutes, with a bath ratio of 1:30, rinsed with deionized water, and placed in a muffle furnace under the protection of argon for heat treatment at 200°C for 2 hours, where the heating rate was 5°C / min, and then heated to 450°C for 3 hours. The heating rate is 10° C. / min, and after natural cooling to room temperature, a tin dioxide / porous carbon composite lithium battery negative electrode material is obtained.

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Abstract

The invention discloses a tin dioxide / porous carbon composite lithium battery negative electrode material and a preparation method. The preparation method comprises the following steps: with fibroin and a high molecular polymer PAMAM as precursors, soaking a fibroin / PAMAM composite material after freeze drying treatment in a stannous sulfate aqueous solution for sufficient adsorption; performing high-temperature calcination to obtain the lithium battery negative electrode material. Sn<2+> and amino groups (mainly tertiary amino groups) in the PAMAM dendrimer can generate an effective complexing action so that the SnO2 nanoparticles are in-situ compounded on the surface of the fibroin / PAMAM; therefore, the yield of tin dioxide / porous carbon compound is higher, the uniform stability is better, and a lithium ion battery negative electrode material with high specific capacity and long cycle life is prepared finally.

Description

technical field [0001] The invention relates to a tin dioxide / porous carbon composite lithium battery negative electrode material and a preparation method, belonging to the field of lithium ion batteries. Background technique [0002] With the rapid development of society, the challenges of environmental pollution and energy crisis are becoming increasingly severe, and green energy has become a research and development hotspot in countries all over the world. As a new type of clean rechargeable power source, lithium-ion batteries have the advantages of light weight, low pollution, high working voltage, high energy density, and long cycle life. They have shown broad application prospects in the fields of national defense, electric vehicles, and electronics. Known as the ideal power supply in the 21st century. In lithium-ion batteries, the negative electrode material is one of the important factors affecting the battery capacity and service life. At present, commercialized l...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCY02E60/10
Inventor 赵兵
Owner 赵兵
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