Multi-edge WS2/graphene electrochemical lithium storage composite electrode and preparation method

A composite electrode, ene electrochemical technology, applied in the direction of battery electrodes, circuits, electrical components, etc.

Inactive Publication Date: 2014-10-15
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 multi-edge WS 2 Nanosheet / 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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  • Multi-edge WS2/graphene electrochemical lithium storage composite electrode and preparation method
  • Multi-edge WS2/graphene electrochemical lithium storage composite electrode and preparation method
  • Multi-edge WS2/graphene electrochemical lithium storage composite electrode and preparation method

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Embodiment 1

[0026] 1) Ultrasonically disperse 2.5 mmol graphene oxide in 60 mL deionized water, add 0.5 mL ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (see figure 1 Schematic diagram) and fully stirred, then added 0.76 g (6.25 mmol) L-cysteine ​​and 1.25 mmol ammonium thiotungstate in sequence, and kept stirring to make L-cysteine ​​and ammonium thiotungstate completely Dissolve and adjust the volume to about 80 mL with deionized water;

[0027] 2) Transfer the obtained mixed solution to a 100 mL hydrothermal reaction kettle, put the reaction kettle into a constant temperature oven, and after hydrothermal reaction at 240 °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 and dried under vacuum at 100 °C. The obtained hydrothermal solid product was heat-treated at 500 °C for 2 h in a nitrogen / hydrogen mixed atmosphere, and the volume fraction of hydrogen in the mixed gas was 1...

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Abstract

The invention discloses a multi-edge WS2/graphene electrochemical lithium storage composite electrode and a preparation method thereof. An electrochemical lithium storage active substance of the composite electrode adopts a composite nanomaterial consisting of multi-edge WS2 nanosheets with a few layers and graphene, a substance ratio of WS2 to graphene in the composite nanomaterial is 1:2, and the composite electrode comprises components in percentage by mass as follows: 80%-85% of the multi-edge WS2 nanosheet/graphene composite nanomaterial, 5%-10% of acetylene black and 5%-10% of polyvinylidene fluoride. The preparation method comprises the steps as follows: the multi-edge WS2 nanosheet/graphene composite nanomaterial with a few layers is firstly prepared, the prepared WS2 nanosheet/graphene composite nanomaterial, acetylene black and polyvinylidene fluoride are prepared into uniform slurry, copper foil is coated with the slurry, and the electrode is prepared through rolling. The prepared multi-edge WS2/graphene electrochemical lithium storage composite electrode has high electrochemical lithium storage capacity.

Description

technical field [0001] The invention relates to an electrochemical lithium storage electrode and a preparation method thereof, in particular to a multi-edge WS 2 The invention discloses a graphene electrochemical lithium storage composite electrode and a preparation method thereof, belonging to the technical field of new energy materials, energy storage and conversion. 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 material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397B82Y30/00B82Y40/00
CPCY02E60/122B82Y30/00B82Y40/00H01M4/136H01M4/1397H01M4/366H01M4/5815H01M4/625Y02E60/10
Inventor 陈涛陈卫祥马琳孙虎叶剑波陈倩男
Owner ZHEJIANG UNIV
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