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

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...

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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

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