WS2 nanowatt/graphene electrochemical lithium storage composite electrode and preparation method

A composite electrode, ene electrochemical technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effect of strong hydrophobicity and strong electrostatic interaction

Inactive Publication Date: 2016-06-22
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 WS 2 Nanowatt / graphene composite nanomaterials as electrochemically active materials for electrochemical lithium storage composite electrodes and their preparation have not been reported yet

Method used

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  • WS2 nanowatt/graphene electrochemical lithium storage composite electrode and preparation method
  • WS2 nanowatt/graphene electrochemical lithium storage composite electrode and preparation method
  • WS2 nanowatt/graphene electrochemical lithium storage composite electrode and preparation method

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Embodiment 1

[0023] 1) Disperse 2.5mmol of graphene oxide ultrasonically in 60mL of deionized water, then add 0.8mmol of gemini surfactant N-dodecyl propylene diamine bis bromide, and stir well, then add 0.76g ( 6.25mmol) L-cysteine ​​and 1.25mmol ammonium thiotungstate, with constant stirring to completely dissolve L-cysteine ​​and ammonium thiotungstate, adjust the volume to about 80 mL with deionized water;

[0024] 2) Transfer the obtained mixture to a 100 mL hydrothermal reaction kettle, put the reaction kettle in a constant temperature oven, and after hydrothermal reaction at 230°C for 24 hours, let it cool to room temperature naturally, and collect the solid product by centrifugation. And fully wash with deionized water, vacuum drying at 100 ℃, the obtained solid product is heat treated in a nitrogen / hydrogen mixed atmosphere at 800 ℃ for 2h, the volume fraction of hydrogen in the mixed gas is 10%, to prepare WS 2 Nano-watt / graphene composite nano-material, composite nano-material WS 2 ...

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Abstract

The invention discloses a WS2 nano tile / graphene electrochemical lithium storage composite electrode and a preparation method thereof. An electrochemical lithium storage active substance of the composite electrode adopts a WS2 nano tile / graphene composite nanomaterial, a substance ratio of the WS2 nano tiles to graphene is 1:2, a few layers of the WS2 nano tiles are provided, the average layer number is four, and the composite electrode comprises components in percentage by mass as follows: 80%-85% of the WS2 nano tile / graphene composite nanomaterial, 5%-10% of acetylene black and 10% of polyvinylidene fluoride. The preparation method comprises the steps as follows: the WS2 nano tile / graphene composite nanomaterial is prepared firstly, the prepared WS2 nano tile / graphene composite nanomaterial, acetylene black and polyvinylidene fluoride are prepared into paste, copper foil is coated with the paste, and the electrode is obtained through rolling. The prepared electrochemical lithium storage composite electrode has high electrochemical lithium storage capacity, excellent cycle performance and enhanced magnification characteristic.

Description

Technical field [0001] The invention relates to an electrochemical lithium storage electrode and a preparation method thereof, in particular to WS 2 A method for preparing a nanowatt / graphene electrochemical lithium storage composite electrode belongs to the field of new energy materials and their applications. Background technique [0002] Lithium-ion batteries have high specific energy, no memory effect, and environmental friendliness. They are widely used in portable mobile appliances such as mobile phones and notebook computers. As power batteries, lithium-ion batteries also have broad application prospects in electric bicycles, electric vehicles, and smart grids. At present, the anode materials of lithium-ion batteries mainly use graphite materials (such as graphite microspheres, natural modified graphite and artificial graphite, etc.). These graphite materials have good cycle stability, but their capacity is low. The theoretical capacity of graphite is 372mAh / g. The new g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36
CPCH01M4/136H01M4/1397H01M4/366H01M4/5815H01M4/625Y02E60/10
Inventor 陈卫祥黄国创王臻马琳叶剑波
Owner ZHEJIANG UNIV
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