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Tin sulfide quantum dot/fluorinated graphene composite electrode used for sodium-ion battery

A fluorinated graphene, sodium-ion battery technology, applied in battery electrodes, graphene, secondary batteries, etc., can solve the problems of excessive capacity decay, large volume change, difficult to embed, etc., to achieve optimal balance of cycle life, Achieving the effect of small capacity and low cost

Inactive Publication Date: 2019-05-14
SHANGHAI HANHANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sodium ions are generally difficult to intercalate into graphite sheets due to their large size
Different from the intercalation / deintercalation mechanism of carbon-based materials, some metals such as antimony and tin have high capacity due to the alloying / dealloying reaction with sodium, but at the same time, the volume change is large during the process, resulting in capacity fading too fast

Method used

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  • Tin sulfide quantum dot/fluorinated graphene composite electrode used for sodium-ion battery
  • Tin sulfide quantum dot/fluorinated graphene composite electrode used for sodium-ion battery
  • Tin sulfide quantum dot/fluorinated graphene composite electrode used for sodium-ion battery

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Embodiment 1

[0027] Disperse 5 mg of commercial fluorinated graphite in 20 ml of N-methylpyrrolidone, and obtain a single-layer fluorinated graphene dispersion through ultrasonic treatment; 182 mg of SnCl 4 ·5H 2 O was dissolved in 10 ml of ethylene glycol, and fully stirred, added to the above fluorinated graphene dispersion; then 81 mg of Na 2 S was dissolved in 10 ml of ethylene glycol, then added to the above mixed solution, and stirred thoroughly, then transferred to the reaction kettle, and reacted at 200 ° C for 20 hours; then centrifuged, washed and vacuum dried to obtain tin sulfide quantum Dot / fluorinated graphene composite negative electrode material, wherein the weight percentage of tin sulfide is 95%. The resulting product was analyzed by XRD and was SnS 2 , fluorinated graphene is not shown due to complete exfoliation, see figure 1 . After structural analysis, the product is a layered structure with a size of 0.2-10 μm, in which the tin sulfide quantum dots have a size of...

Embodiment 2

[0037] Disperse 10 mg of commercial fluorinated graphite in 40 ml of N,N dimethylformamide, and obtain a single-layer fluorinated graphene dispersion by ultrasonic treatment; 111 mg of SnCl 2 2H 2 O was dissolved in 20 milliliters of glycerol, and stirred well, was added to the above fluorinated graphene dispersion; then 108 milligrams of K 2S was dissolved in 20 ml of glycerol, then added to the above mixed solution, and stirred thoroughly, then transferred to the reaction kettle, and reacted at 210°C for 15 hours; then centrifuged, washed and vacuum dried to obtain tin sulfide quantum Dot / fluorinated graphene composite negative electrode material, wherein the weight percentage of tin sulfide is 90%. The obtained product was analyzed as SnS by XRD 2 . According to structural analysis, the product is a layered structure with a size of 0.5-15 μm, in which tin sulfide quantum dots have a size of 3-5 nm, and are uniformly dispersed on the fluorinated graphene sheet. The compo...

Embodiment 3

[0039] Disperse 20 mg of commercial fluorinated graphite in 80 ml of isopropanol, and obtain a monolayer fluorinated graphene dispersion through ultrasonic treatment; 166 mg of Na 2 SnO 3 ·3H 2 O was dissolved in 25 milliliters of isopropanol, and fully stirred into the above fluorinated graphene dispersion; then 59 milligrams (NH 4 ) 2 Dissolve S in 25 ml of isopropanol, add it to the above mixed solution, and stir thoroughly, then transfer to the reaction kettle, and react at 220°C for 10 hours; then centrifuge, wash and vacuum dry to obtain tin sulfide quantum Dot / fluorinated graphene composite negative electrode material, wherein the weight percentage of tin sulfide is 80%. The obtained product was analyzed as SnS by XRD 2 . According to structural analysis, the product is a layered structure with a size of 1-20 μm, in which tin sulfide quantum dots have a size of 2-5 nm, and are uniformly dispersed on the fluorinated graphene sheet. The composite negative electrode ...

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Abstract

The invention discloses a tin sulfide quantum dot / fluorinated graphene composite electrode used for a sodium-ion battery. The sodium-ion battery adopting a negative electrode material has high capacity and long cycle lifetime. The composite electrode is formed by tin sulfide quantum dots and fluorinated graphene in a multi-layered structure, and the tin sulfide quantum dots are uniformly dispersedand clamped between the fluorinated graphene of the multi-layered structure. The invention also discloses a preparation method thereof. The method includes following steps: dispersing the fluorinatedgraphene in an organic solvent, and obtaining single-layer fluorinated graphene dispersion through ultrasonic processing; dissolving a tin-containing salt in the organic solvent for adequate stirringand dissolution, and adding the organic solvent into the single-layer fluorinated graphene dispersion to obtain a mixed solution; and dissolving a sulfide in the organic solvent for adequate stirringand dissolution, adding the organic solvent into the mixed solution in step 2, and obtaining a tin sulfide quantum dot / fluorinated graphene composite electrode material through thermal reaction and processing of the solvent. According to the composite negative electrode material, the energy consumption is low, the cost is low, the period is short, and mass production is facilitated.

Description

technical field [0001] The invention relates to a tin sulfide quantum dot / fluorinated graphene composite electrode for a sodium ion battery. Background technique [0002] With the development of society and economy, energy consumption is increasing day by day, traditional fossil energy continues to decrease, and human consumption of traditional fossil energy has caused serious environmental pollution. Under this environment, clean, renewable and cheap new energy It has become the object of development by governments of various countries. At present, the proportion of wind energy, solar energy and ocean energy in energy consumption is constantly increasing. However, these renewable energy sources are greatly affected by weather and time periods, and are obviously unstable, discontinuous and irresistible. control characteristics, it is necessary to develop and build supporting electric energy storage (energy storage) devices, namely batteries, to ensure the continuity and stab...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054C01B32/182
CPCY02E60/10
Inventor 石坚
Owner SHANGHAI HANHANG TECH CO LTD