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Method for preparing flaky Sb2Se3 nanocrystalline for sodium-ion battery negative electrodes

A sodium-ion battery and nanocrystal technology, applied in the field of electrochemical energy storage, can solve the problems of few reports and achieve the effects of simple equipment, excellent rate performance, and low reaction temperature

Active Publication Date: 2018-04-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, for two-dimensional sheet Sb 2 Se 3 There are still relatively few reports on nanocrystals as anode materials for sodium-ion batteries

Method used

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  • Method for preparing flaky Sb2Se3 nanocrystalline for sodium-ion battery negative electrodes
  • Method for preparing flaky Sb2Se3 nanocrystalline for sodium-ion battery negative electrodes
  • Method for preparing flaky Sb2Se3 nanocrystalline for sodium-ion battery negative electrodes

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Experimental program
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Effect test

Embodiment 1

[0020] 1) Add 0.001g of polyvinylpyrrolidone and 0.2g of tartaric acid into 25ml of deionized water, stir magnetically at 500r / min until it is completely dissolved to obtain a transparent solution A1, then add 0.169g of antimony potassium tartrate into solution A1 for Stir to obtain a transparent solution A2, wherein the molecular weight of polyvinylpyrrolidone is 30000;

[0021] 2) According to the molar ratio of antimony potassium tartrate and sodium selenite being 1:1, sodium selenite was added to 3 mL of hydrazine hydrate with a mass percentage of 50%, and magnetically stirred at 500 r / min to obtain wine red solution B; stir Add solution B quickly dropwise to solution A2, stir and disperse evenly to obtain mixed solution C;

[0022] 3) Transfer the mixed solution C to the polytetrafluoroethylene lining at a filling ratio of 30%, put it into a homogeneous reactor, and keep it at 100°C for 12 hours, then cool it to room temperature with the furnace, and use deionized water a...

Embodiment 2

[0024] 1) Add 0.002g of polyvinylpyrrolidone and 0.5g of tartaric acid into 45ml of deionized water, stir magnetically at 600r / min until it is completely dissolved to obtain a transparent solution A1, and then add 0.338g of antimony potassium tartrate into solution A1 to continue Stir to obtain a transparent solution A2, wherein the molecular weight of polyvinylpyrrolidone is 30000;

[0025] 2) Add sodium selenite to 5 mL of hydrazine hydrate with a mass percentage of 50% according to the molar ratio of antimony potassium tartrate and sodium selenite at a molar ratio of 1:1.5, and magnetically stir at 600 r / min to obtain wine red solution B; stir Add solution B quickly dropwise to solution A2, stir and disperse evenly to obtain mixed solution C;

[0026] 3) Transfer the mixed solution C to the polytetrafluoroethylene lining at a filling ratio of 50%, put it into a homogeneous reactor, and keep it at 120°C for 8 hours, then cool it to room temperature with the furnace, and use ...

Embodiment 3

[0028]1) Add 0.003g of polyvinylpyrrolidone and 1.0g of tartaric acid into 53ml of deionized water, stir magnetically at 500r / min until it is completely dissolved to obtain a transparent solution A1, then add 0.6759g of antimony potassium tartrate into solution A1 for Stir to obtain a transparent solution A2, wherein the molecular weight of polyvinylpyrrolidone is 30000;

[0029] 2) According to the molar ratio of potassium antimony tartrate and sodium selenite of 1:2, sodium selenite was added to 7 mL of hydrazine hydrate with a mass percentage of 50%, and magnetically stirred at 500 r / min to obtain wine red solution B; stir Add solution B quickly dropwise to solution A2, stir and disperse evenly to obtain mixed solution C;

[0030] 3) Transfer the mixed liquid C to the polytetrafluoroethylene lining at a filling ratio of 60%, put it into a homogeneous reactor, and keep it at 130°C for 6 hours, then cool it to room temperature with the furnace, and use deionized water and anh...

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Abstract

A method for preparing flaky Sb2Se3 nanocrystalline for sodium-ion battery negative electrodes includes: adding polyvinylpyrrolidone and tartaric acid into deionized water to obtain solution A1, and adding antimony potassium tartrate into the solution A1 to obtain solution A2; adding sodium selenite into hydrazine hydrate to obtain solution B; dropwise adding the solution B into the solution A2 toobtain mixed liquid C; transferring the mixed liquid C to a polytetrafluoroethylene liner, adding a homogeneous reaction instrument, furnace cooling to the room temperature after reaction at 100-150DEG C, adopting deionized water and absolute ethyl alcohol to repeatedly wash and separate precipitates, and performing freeze drying to obtain flaky Sb2Se3 nanocrystalline for the sodium-ion batterynegative electrodes. By adoption of a one-step hydrothermal method, equipment simplicity, greenness, safety, low reaction temperature, high repeatability and suitableness for large-scale production are realized. Due to easiness in control of product morphological structures in a liquid-phase environment, flaky pure-phase Sb2Se3 nanocrystalline can be successfully prepared through crystal development induction under the action of polyvinylpyrrolidone and tartaric acid.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, in particular to a sheet-shaped Sb used for the negative electrode of a sodium-ion battery 2 Se 3 Methods of preparing nanocrystals. Background technique [0002] The development of lithium-ion batteries began in about 1980. With the continuous progress of society and the continuous development of science and technology, scientists have gradually realized that the shortage of lithium resources restricts the development of lithium-ion batteries. Therefore, Na-ion batteries, which are of the same main group and have abundant reserves and similar electrochemical behavior, have gradually attracted the attention of many researchers. Antimony-based selenide sodium ion battery anode material Sb2Se3, a V-VI compound with a layered structure, as a sodium ion battery anode material, 1mol of Sb2Se3 can embed 12mol of Na+, and the conversion reaction is a reversible process , these all prompt...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/054B82Y40/00
CPCB82Y40/00H01M4/581H01M10/054Y02E60/10
Inventor 曹丽云郭玲李嘉胤黄剑锋程娅伊齐慧李倩颖仵婉晨
Owner SHAANXI UNIV OF SCI & TECH
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