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Preparation method of tin sulfide/nitrogen-doped flower-like carbon negative electrode material of lithium ion battery and product thereof

A technology for lithium-ion batteries and negative electrode materials, applied in the direction of battery electrodes, carbon preparation/purification, chemical instruments and methods, etc., can solve the problems of capacity decay, volume expansion of electrode materials, and low specific capacity of negative electrodes, and achieve improved wetting situation, improving lithium storage performance, and enhancing the effect of electrical conductivity

Active Publication Date: 2021-01-08
湖南金钺新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a kind of preparation method and product thereof of tin sulfide / nitrogen-doped flower-shaped carbon lithium-ion battery negative electrode material; 2 As an electrode material, there are problems such as serious volume expansion and rapid capacity decay during charge and discharge.

Method used

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  • Preparation method of tin sulfide/nitrogen-doped flower-like carbon negative electrode material of lithium ion battery and product thereof
  • Preparation method of tin sulfide/nitrogen-doped flower-like carbon negative electrode material of lithium ion battery and product thereof
  • Preparation method of tin sulfide/nitrogen-doped flower-like carbon negative electrode material of lithium ion battery and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) First add benzidine to 40mL dimethylformamide, stir until it is completely dissolved to obtain a solution with a concentration of 15mg / mL, then follow the method of benzidine and 3,3',4,4'-biphenyltetracarboxylic acid The dianhydride molar ratio is 1:1, 3,3',4,4'-biphenyltetracarboxylic dianhydride is added dropwise to the above solution, the mixed solution is stirred at a constant speed of 300r / min for 10h, and pre-polymerization is carried out to obtain prepolymerization solution.

[0029] 2) Transfer the pre-polymerization solution obtained in step 1) to a polytetrafluoroethylene reactor for solvothermal reaction at 170° C. for 9 hours; after the reactor is naturally cooled, perform vacuum filtration, and repeatedly wash with absolute ethanol for 6 times, and then The filter cake was vacuum-dried at 60°C for 10 h to obtain a primary sample.

[0030] 3) Spread the primary sample obtained in step 2) in the corundum ark, and then use N 2 In order to protect the gas...

Embodiment 2

[0034] 1) First add benzidine into dimethylformamide, stir until it is completely dissolved to obtain a solution with a concentration of 24 mg / mL, then follow the steps of benzidine and 3,3',4,4'-biphenyltetracarboxylic dianhydride The molar ratio is 1:1, add 3,3',4,4'-biphenyltetracarboxylic dianhydride dropwise to the above solution, stir the mixed solution at a constant speed of 350r / min for 11h, and carry out prepolymerization reaction to obtain prepolymerization solution.

[0035] 2) Transfer the pre-polymerized solution obtained in step 1) to a polytetrafluoroethylene reactor for solvothermal reaction at 180° C. for 10 h; after the reactor is naturally cooled, perform vacuum filtration, and repeatedly wash 7 times with absolute ethanol, and then The filter cake was vacuum-dried at 70° C. for 11 h to obtain a primary sample.

[0036] 3) Spread the primary sample obtained in step 2) in the corundum ark, and then use N 2 In order to protect the gas, the temperature was ra...

Embodiment 3

[0040] 1) First add benzidine to dimethylformamide, stir until it is completely dissolved to obtain a solution with a concentration of 30mg / mL, then follow the method of benzidine and 3,3',4,4'-biphenyltetracarboxylic dianhydride The molar ratio is 1:1, add 3,3',4,4'-biphenyltetracarboxylic dianhydride dropwise to the above solution, stir the mixed solution at a constant speed of 400r / min for 12h, and carry out prepolymerization reaction to obtain prepolymerization solution.

[0041] 2) Transfer the pre-polymerized solution obtained in step 1) to a polytetrafluoroethylene reactor for solvothermal reaction at 190° C. for 11 hours; after the reactor is naturally cooled, perform vacuum filtration, and repeatedly wash with absolute ethanol for 8 times, and then The filter cake was vacuum-dried at 80°C for 12 hours to obtain a primary sample.

[0042] 3) Spread the primary sample obtained in step 2) in the corundum ark, and then use N 2 In order to protect the gas, the temperatur...

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Abstract

The invention discloses a preparation method of a tin sulfide / nitrogen-doped flower-like carbon negative electrode material of a lithium ion battery and a product thereof. The preparation method comprises the following steps: preparing polyimide with a flower-like structure by utilizing a self-assembly behavior in a polymerization process of benzidine and 3,3',4,4'-biphenyltetracarboxylic dianhydride; then carrying out thermal decomposition on the polyimide to obtain a nitrogen-doped flower-like carbon material; and finally, mixing the flower-like carbon, SnCl4.5H2O and L-cysteine for a solvothermal reaction so as to obtain the tin sulfide / nitrogen-doped flower-like carbon composite material. The flower-like carbon structure of the composite material can overcome physical stress generatedby volume change, and cooperates with the continuously formed SEI film to limit SnS2 agglomeration, gaps in an electrode reserve enough space for volume expansion and allow the flower-like carbon structure to be in full contact with an electrolyte, and the diffusion distance of Li<+> is shortened. The material prepared by the invention is used for the negative electrode of the lithium ion batteryand has the characteristics of high capacity, good cycle performance, excellent rate capability and the like; and preparation process is simple, the performance of the material is controllable, and universality is obtained.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of a tin sulfide / nitrogen-doped flower-shaped carbon lithium-ion battery negative electrode material and a product thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working potential, large specific capacity, long cycle life, stable working voltage, and small self-discharge, and are considered to be one of the most promising new generation energy storage devices in this century. Lithium-ion batteries not only provide energy for portable digital electronics, but also for larger mobile devices (electric or hybrid vehicles). Furthermore, they have great potential in the field of solar-wind complementary energy storage systems. In recent years, as electronic products have become an integral part of people's daily life, the demand for lithium-ion batteries has also increased significantly. [0003] SnS 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00C01B32/05H01M4/58H01M4/62H01M10/0525
CPCC01G19/00C01P2002/72C01P2004/03C01P2004/61C01P2004/62C01P2004/80C01B32/05H01M4/5815H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 苏哲安徐平张明瑜黄启忠戴开斌邹壬灏
Owner 湖南金钺新材料有限责任公司
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