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Nano-composite, preparation method therefor and application thereof

A nanocomposite material and technology of composite materials, which are applied in the field of preparation of electrode materials for sodium ion batteries, can solve the problems such as the inability to apply sodium ion batteries, and achieve high reversible specific capacity, excellent cycle stability, good battery capacity and cycle stability. Effect

Inactive Publication Date: 2017-08-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with lithium-ion batteries, sodium-ion batteries have obvious differences in electrode materials. For example, graphite has been widely used in commercial lithium-ion batteries and has a high theoretical capacity, but it cannot be used in sodium-ion batteries.

Method used

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  • Nano-composite, preparation method therefor and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of embedding structure MoS 2 The preparation method of Sb sodium ion battery negative electrode material comprises the steps:

[0031] (1) Add 0.14g MoO to 20mL ethylene glycol 3 and 1.2g Na 2 S, solution A is obtained after magnetic stirring;

[0032] (2) Add 0.2g SbCl to 20mL ethylene glycol 3 , to obtain solution B by magnetic stirring;

[0033] (3) Under stable magnetic stirring conditions, solution B is added dropwise in solution A, after the dropwise addition is completed, the resulting mixed solution is transferred to a stainless steel high-pressure reactor containing a polytetrafluoroethylene liner, and the reactor is placed Put it into an electric blast drying oven, and keep the temperature at 200°C. After reacting for 24 hours, let it cool down to room temperature naturally.

[0034] (4) The product was separated by centrifugation, washed several times with deionized water and ethanol, and then dried in a vacuum oven for 12 hours.

[0035] see fi...

Embodiment 2

[0039] A kind of embedding structure MoS 2 The preparation method of Sb sodium ion battery negative electrode material comprises the steps:

[0040] (1) Add 0.28g MoO to 20mL ethylene glycol 3 and 1.2g Na 2 S, solution A is obtained after magnetic stirring;

[0041] (2) Add 0.2g SbCl to 20mL ethylene glycol 3 , to obtain solution B by magnetic stirring;

[0042] (3) Under stable magnetic stirring conditions, solution B is added dropwise in solution A, after the dropwise addition is completed, the resulting mixed solution is transferred to a stainless steel high-pressure reactor containing a polytetrafluoroethylene liner, and the reactor is placed Put it into an electric blast drying oven, and keep the temperature at 200°C. After reacting for 24 hours, let it cool down to room temperature naturally.

[0043] (4) The product was separated by centrifugation, washed several times with deionized water and ethanol, and then dried in a vacuum oven for 12 hours.

Embodiment 3

[0045] A kind of embedding structure MoS 2 The preparation method of Sb sodium ion battery negative electrode material comprises the steps:

[0046] (1) Add 0.07g MoO to 20mL ethylene glycol 3 and 1.2g Na 2 S, solution A is obtained after magnetic stirring;

[0047] (2) Add 0.2SbCl to 20mL ethylene glycol 3 , to obtain solution B by magnetic stirring;

[0048] (3) Under stable magnetic stirring conditions, solution B is added dropwise in solution A, after the dropwise addition is completed, the resulting mixed solution is transferred to a stainless steel high-pressure reactor containing a polytetrafluoroethylene liner, and the reactor is placed Put it into an electric blast drying oven, and keep the temperature at 200°C. After reacting for 24 hours, let it cool down to room temperature naturally.

[0049] (4) The product was separated by centrifugation, washed several times with deionized water and ethanol, and then dried in a vacuum oven for 12 hours.

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Abstract

The invention provides a nano-composite, a preparation method therefor and an application thereof. The nano-composite has an embedding covering composite structure of ultra-thin MoS2 nano-sheets and Sb nano-sheets, and belongs to the technical field of preparing a sodium-ion battery electrode material. The MoS2 / Sb nano-composite is prepared by one-step synthesis using solvothermal method. The volume expansion of Sb in the processes of charging and discharging can be effectively alleviated by MoS2 while Sb can prevent the MoS2 nano-sheets from superimposing. The cycle stability and sodium storage performance of the composite as a sodium-ion battery negative electrode material are improved by the synergy effect of the two materials. The preparation process of the nano-composite is simple with a high repeatability, stable products and short production period, and is favourable for convenient production. The MoS2 / Sb composite prepared according to the method has a two-dimensional embedding covering structure, and has the features of high reversible specific capacity and excellent cycle stability as a sodium-ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for sodium ion batteries, and specifically relates to a nanocomposite material and its preparation method and application. The nanocomposite material is MoS with embedded structure 2 / Sb sodium ion battery negative electrode material, also relates to a kind of MoS with embedded structure prepared by solvothermal method 2 / Sb high-performance sodium-ion battery anode material method. Background technique [0002] With people's widespread attention to renewable energy and new energy, as well as the vigorous development of new energy vehicles and smart grids, research on efficient and convenient energy storage technologies has become a research hotspot worldwide. Compared with lithium-ion batteries, which suffer from the lack of lithium resources in the world, sodium-ion batteries have very broad application prospects due to their physical and chemical properties similar to lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/362H01M4/38H01M4/5815H01M10/054B82Y30/00B82Y40/00Y02E60/10
Inventor 安长华李闯王淑涛王兆杰张军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)