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WS2 nano tile/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: 2014-10-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, so far, electrochemical lithium storage composites using WS2 nanowatt / graphene composite nanomaterials as electrochemically active materials The electrode and its preparation have not been reported yet

Method used

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

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Embodiment 1

[0023] 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 (6.25 mmol) L-cysteine ​​and 1.25 mmol ammonium thiotungstate, and keep stirring to completely dissolve L-cysteine ​​and ammonium thiotungstate, and adjust the volume to about 80 mL with deionized water;

[0024] 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 WS was prepared. 2 Composite nanomaterials of na...

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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 The invention discloses a method for preparing a nanowatt / graphene electrochemical lithium storage composite electrode, which belongs to the field of new energy materials and their applications. Background technique [0002] 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 battery, lithium-ion batteries also have broad application prospects in electric bicycles, electric vehicles and smart grids. At present, graphite materials (such as: graphite microspheres, natural modified graphite and artificial graphite, etc.) are mainly used as negative electrode materials for lithium-ion batteries. These graphite materials have good cycle stability,...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/36
CPCY02E60/122H01M4/136H01M4/1397H01M4/366H01M4/5815H01M4/625Y02E60/10
Inventor 陈卫祥黄国创王臻马琳叶剑波
Owner ZHEJIANG UNIV
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