Composite electrode for simultaneous electrochemical lithium storage and sodium storage and preparation method thereof

Abstract

The invention discloses a composite electrode for simultaneous electrochemical lithium storage and sodium storage and a preparation method thereof. The composite electrode utilizes a Bi2S3-MoS2/graphene composite nanomaterial as an active material for simultaneous electrochemical lithium storage and sodium storage. The method comprises the preparation steps of preparing the Bi2S3-MoS2/graphene composite nanomaterial through hydrothermal reaction of a mixed solution of Bi(NO3)3, Na2MoO4 and L-cysteine under the hydrothermal condition in the presence of graphene oxide; and blending the obtainedBi2S3-MoS2/graphene composite nanomaterial, acetylene black, carboxymethyl cellulose and a polyvinylidene fluoride solution into uniform paste, coating copper foil with the paste, and drying and rolling to obtain the composite electrode for simultaneous electrochemical lithium storage and sodium storage. The composite electrode has the advantages of high reversible specific capacity of simultaneous electrochemical lithium storage and sodium storage, stable cycle performance and significantly enhanced high rate charge-discharge characteristics.

Description

technical field [0001] The invention relates to a composite electrode for simultaneously electrochemically storing lithium and storing sodium and a preparation method thereof, in particular to using Bi 2 S 3 -MoS 2 The invention relates to a graphene / graphene composite nanomaterial as a composite electrode for simultaneously electrochemically storing lithium and sodium as an active material and a preparation method thereof, and belongs to the technical field of application of composite electrodes for electrochemically storing lithium and sodium. Background technique [0002] Lithium-ion batteries have the advantages of high specific capacity and long cycle life, and have been widely used in mobile communications, electric mopeds, electric vehicles, and energy storage. However, the massive application of lithium-ion batteries has led to a relative shortage of lithium resources and rising prices of lithium resources or raw materials. For example, the price of lithium carbona...

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Problems solved by technology

However, so far this use of Bi 2 S 3 -MoS 2 /Graphene composite nanomaterials are composite electrodes that simultaneous

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