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Electrochemical sodium storage composite electrode with high capacity and cycle stability and preparation method

A composite electrode, electrochemical technology, used in battery electrodes, non-aqueous electrolyte battery electrodes, nanotechnology for materials and surface science, etc., to achieve the effect of strong hydrophobicity and strong mutual electrostatic interaction

Inactive Publication Date: 2014-10-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, so far, with MoS 2 Nanowatt / graphene composite nanomaterials as electrochemically active materials for electrochemical sodium storage composite electrodes and their preparation have not been reported yet

Method used

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  • Electrochemical sodium storage composite electrode with high capacity and cycle stability and preparation method
  • Electrochemical sodium storage composite electrode with high capacity and cycle stability and preparation method
  • Electrochemical sodium storage composite electrode with high capacity and cycle stability and preparation method

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Embodiment 1

[0024] 1) Ultrasonic disperse 2.5 mmol of graphene oxide in 60 mL of deionized water, then add 0.8 mmol of gemini surfactant N-dodecylpropylenediamine diammonium bromide, stir well, and then add 0.76g (6.25mmol) L-cysteine ​​and 0.3 g (1.25 mmol) sodium molybdate (Na 2 MoO 4 2H 2 O), and keep stirring to completely dissolve L-cysteine ​​and sodium molybdate, and adjust the volume to about 80 mL with deionized water;

[0025] 2) Transfer the obtained mixed solution into a 100 mL hydrothermal reaction kettle, put the reaction kettle into a constant temperature oven, and after hydrothermal reaction at 230 °C for 24 h, let it cool down to room temperature naturally, and collect the solid by centrifugation The product was fully washed with deionized water, dried in vacuum at 100 °C, and the obtained solid product was heat-treated at 800 °C for 2 h in a nitrogen / hydrogen mixed atmosphere. The volume fraction of hydrogen in the mixed gas was 10%, and MoS was prepared. 2 Composite ...

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Abstract

The invention discloses an electrochemical sodium storage composite electrode with high capacity and cycle stability and a preparation method. The electrochemical sodium storage active substance is a MoS2 nano tile / graphene composite nano material; the substance amount ratio of the MoS2 nano tile to graphene in the composite nano material is (1 to 1)-(1 to 13); the MoS2 nano tile is of a few-layer layered structure, and the average layer number is 4; the composite electrode comprises the following components by weight percent: 80% of MoS2 nano tile / graphene composite nano material, 10% of acetylene black, 5% of carboxymethyl cellulose and 5% of polyvinylidene fluoride. The preparation method comprises the following steps: preparing a MoS2 nano tile / graphene composite nano material, and blending the MoS2 nano tile / graphene composite nano material with acetylene black and polyvinylidene fluoride to obtain a paste; smearing the paste on a copper foil serving as a current collector; and performing vacuum drying and rolling to obtain the electrochemical sodium storage composite electrode. The MoS2 nano tile / graphene electrochemical sodium storage composite electrode disclosed by the invention has high reversible sodium storage capacity and wide application prospect.

Description

technical field [0001] The invention relates to an electrochemical sodium storage electrode and a preparation method thereof, in particular to the use of MoS 2 A high-capacity and cycle-stable electrochemical sodium storage composite electrode prepared by nanowatt / graphene and a preparation method thereof belong to the field of preparation of inorganic composite nanomaterials and new energy materials. Background technique [0002] With the development of modern mobile communications, new energy vehicles and smart grids, new chemical power sources play an increasingly important role in modern society. Traditional secondary batteries, such as lead-acid batteries, have limited applications due to the harmful metal element Pb they contain. Lithium-ion batteries have excellent properties such as high specific energy, no memory effect, and environmental friendliness, and have been widely used in portable mobile appliances such as mobile phones and notebook computers. As a power ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122B82Y30/00H01M4/136H01M4/1397H01M4/366H01M4/5815H01M4/625Y02E60/10
Inventor 陈卫祥马琳黄国创王臻叶剑波
Owner ZHEJIANG UNIV
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