Black phosphorus nanosheet-graphene composite film anode and its preparation for flexible lithium-ion batteries

Abstract

The invention belongs to the field of electrochemistry battery, and more specifically relates to a black phosphorus nanosheet-graphene composite film anode used for flexible lithium ion batteries, and a preparation method thereof. According to the preparation method, high purity and large scale black phosphorus blocks are synthesized via mineral substance assistant vapor transporting method with high efficiency; a large amount of clean and high quality black phosphorus sheets are prepared in water via ultrasound treatment; the clean and high quality black phosphorus sheets and high conductive graphene nanosheets prepared via intercalation stripping method are subjected to mixing ultrasonic dispersion; and flexible high-strength laminated composite film is prepared via vacuum filtration. The preparation process of the flexible high-strength laminated composite film is simple and controllable; large scale low cost preparation can be realized; black phosphorus nanosheets are high in capacity, graphene is high in electrical conductivity, and the black phosphorus nanosheets and graphene both possess two-dimensional structures high in flexibility and strength, so that problems the black phosphorus is poor in electrical conductivity and stability are solved, lithium ion battery capacity, cycling stability, and entire energy density are increased, and lithium ion battery electrode integrated flexible design is realized.

Description

technical field [0001] The invention belongs to the field of electrochemical batteries, and in particular relates to a black phosphorus nanosheet-graphene composite film negative electrode for a flexible lithium ion battery and a preparation method thereof. Background technique [0002] As people's demand for various new technologies and technologies, especially wearable devices, is increasing, high-efficiency energy storage devices as the basis of power supplies for these applications have received widespread attention, and are also important for the development of high energy density, power density and good circulation. Stable and flexible properties of secondary batteries place high demands. Electrode materials and their structural design are key factors for the development of high-performance flexible secondary batteries. The current commercial secondary lithium-ion batteries mainly use graphite, carbon fiber, lithium titanate and its composite materials as negative ele...

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Problems solved by technology

[0004] The object of the present invention is to provide a black phosphorus nanosheet-graphene composite film negative electrode for a flexible lithium-ion battery and a preparation method thereof, making full use of the high capacity of the black phosphorus nanosheet and the good conductivity of graphene and the flexibility of both. , High-strength two-dimensional structure characteristics, while achieving flexibility, solve the problem of poor conductivity and stability of black phosphorus, improve the capacity, cycle stability and overall energy density of lithium-ion batteries, and realize the integrated flexible design of lithium-ion battery electrodes

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