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Graphene composite amorphous metal-based sulfide electrode material and preparation method thereof

A graphene composite and amorphous metal technology, applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve problems such as insignificant advantages, difficult controllability, failure of battery storage units, etc., to achieve excellent performance and avoid Improvement of electrode degradation and volume expansion

Inactive Publication Date: 2021-10-22
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the controllability of the synthesis of tin or antimony-based compound amorphous materials, there are few types of materials reported so far. The performance of single-component tin or antimony-based materials is not obvious among all negative electrode materials. Tin sulfide Or antimony sulfide will undergo violent expansion and aggregation during charging and discharging, leading to failure of battery storage units, and composite materials can effectively solve this problem due to the synergistic effect

Method used

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  • Graphene composite amorphous metal-based sulfide electrode material and preparation method thereof
  • Graphene composite amorphous metal-based sulfide electrode material and preparation method thereof
  • Graphene composite amorphous metal-based sulfide electrode material and preparation method thereof

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Embodiment 1

[0036] (1) Graphite powder was treated with 5% dilute hydrochloric acid to improve the hydrophilicity of graphite, and then dried in a vacuum oven at 80 ºC to obtain flake graphite.

[0037] (2) Weigh 5 g flake graphite and 5 g potassium permanganate in advance, measure 500 mL of concentrated sulfuric acid and 500 mL of deionized water, and prepare a sufficient amount of hydrogen peroxide; set the ice bath temperature of the ice bath at 0°C Perform pre-cooling; weigh 5 g flake graphite and pour it into a 3 L beaker, set the magneton speed properly (fully mix the reactants to avoid splashing of the mixed solution); slowly pour 500 mL of concentrated sulfuric acid into the beaker, pay attention to control and keep ice Bath temperature is 0~3ºC; fully mechanically mix; slowly add 5 g potassium permanganate to the beaker, pay attention to control and keep the ice bath temperature at 0~3ºC; set the water bath temperature of the water bath machine to 35ºC, wait until the mixture is f...

Embodiment 2

[0041] (1) First set the temperature of the oil bath at 70 °C for preheating; use a graduated cylinder to measure 15 mL of the GO ethanol dispersion in Example 1 at 1 mg / mL, add it to an 80 mL reaction bottle, and then add About 20 mL of absolute ethanol; weigh 2.4720 g of ammonium molybdate tetrahydrate, 0.1128 g of stannous chloride dihydrate and 0.3750 g of thioacetamide, and add them to the reaction flask; add to the reaction flask Add anhydrous ethanol to the 80 mL mark; seal the reaction bottle with plastic wrap, screw the cap tightly, and place it in a preheated 70°C oil bath; turn on the magnetic stirring and set the speed to 450 r / min; react for 12 hours; Take out the reaction bottle from the oil bath, add absolute ethanol to accelerate the cooling, seal it with plastic wrap and let it stand for 30-60 min; take the upper precipitate and centrifuge 3 times with absolute ethanol, and then centrifuge 3 times with deionized water; disperse the product in Put it in deioniz...

Embodiment 3

[0045] (1) First set the temperature of the oil bath at 70 °C for preheating; use a graduated cylinder to measure 15 mL of the GO ethanol dispersion in Example 1 at 1 mg / mL, add it to an 80 mL reaction bottle, and then add About 20 mL of absolute ethanol; weigh 2.4720 g of ammonium molybdate tetrahydrate, 0.3750 g of thioacetamide and 0.1142 g of antimony chloride into the reaction flask; add absolute ethanol to the reaction flask to 80 mL scale line; seal the reaction bottle with plastic wrap and tighten the cap, put it into a preheated 70°C oil bath; turn on the magnetic stirring and set the speed to 450 r / min; react for 12 hours; take it out of the oil bath Add absolute ethanol to the reaction bottle to accelerate cooling, seal it with plastic wrap and let it stand for 30-60 min; take the upper precipitate and centrifuge three times with absolute ethanol, and then centrifuge three times with deionized water; disperse the product in deionized water, place Spread out on a pet...

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a graphene composite amorphous metal-based sulfide electrode material and a preparation method thereof. The method comprises the steps of solvothermal preparation, centrifugal purification and freeze drying. The tin or antimony-based alloying reaction material with the advantages of high theoretical capacity and low cost is adopted, a low-temperature solvothermal method is adopted, and heterogeneous elements are added to obtain the amorphous ternary sulfide material, so that the problem of volume expansion of the alloying material in the reaction process can be greatly improved, and the electrochemical performance is improved.

Description

technical field [0001] The invention relates to a negative electrode material of a sodium / potassium ion battery and a preparation method thereof, belonging to the technical field of electrode material preparation. Background technique [0002] With the development of lithium-ion batteries and the shortage of lithium resources, new ion batteries with extensive resources and low cost, such as sodium-ion and potassium-ion batteries, have become a research hotspot. Commercial lithium-ion batteries usually use cheap graphite as the anode material. However, unlike lithium ions, their intercalation / extraction mechanism between graphite layers is hampered by kinetic factors due to the large size of sodium and potassium ions. Therefore, finding highly efficient anodes for Na-ion and K-ion batteries has become an urgent problem to be solved. In the process of selecting a variety of anode materials, tin or antimony-based alloying reaction anode materials have attracted extensive atte...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M4/587H01M10/054
CPCH01M4/5815H01M4/626H01M4/628H01M4/587H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 林若浩俞渊孙伟玲徐璟
Owner NANJING UNIV OF SCI & TECH
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