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

A graphene composite and lithium-ion battery technology, applied in the field of electrochemical batteries, can solve the problems of poor conductivity and stability, achieve good flexibility and strength, increase specific energy, and increase the effect of contact area

Active Publication Date: 2019-05-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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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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  • Black phosphorus nanosheet-graphene composite film anode and its preparation for flexible lithium-ion batteries

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[0041] In the specific implementation process, the present invention proposes a black phosphorus nanosheet-graphene composite thin film negative electrode for lithium ion batteries and its preparation method, which uses a mineral-assisted gas phase transport method to combine black phosphorus blocks, and then uses Tip ultrasonic preparation Black phosphorus nanosheet powder, disperse black phosphorus nanosheets and graphene in an organic solvent in a certain proportion, vacuum filter on the organic diaphragm after ultrasonication, and peel off the film from the organic diaphragm after vacuum drying to obtain black phosphorus Nanosheet-graphene composite film anode. Specific steps are as follows:

[0042] (1) Synthesis of black phosphorus block by mineral-assisted gas phase transport method: red phosphorus, gold-tin alloy (AuSn, alloy grades such as: AuSn20, AuSn27 or AuSn90, etc.) and tin tetraiodide according to 900:360:18 The weight ratio is encapsulated in a quartz ampoule...

Embodiment 1

[0052] Put 1000mg of black phosphorus block into a mortar and grind it into powder (see figure 2 ), put the black phosphorus powder into a glass bottle with 200mL deionized water (the content of black phosphorus is 5mg / mL). Use Tip to ultrasonically peel off black phosphorus blocks to prepare black phosphorus nanosheets (ultrasonic power is 380W, and ultrasonic time is 3h). Dispersion of tablets in water. The above dispersion was vacuum filtered and washed with ethanol, and dried in vacuum at 60°C for 12 hours to obtain black phosphorus nanosheet powder (average thickness about 5.2nm, see image 3 g; the lateral dimension is 50-250nm, see Figure 4 a-c). 12mg (80wt%) of black phosphorus nanosheet powder and 3mg (20wt%) of graphene were added together into N-methylpyrrolidone (40mL) organic solvent, and the two were uniformly mixed by ordinary ultrasound (190W, 60min). Use a polypropylene microporous membrane to vacuum filter the above mixed solution, wash with ethanol, an...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/366H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 任文才陈龙周光敏李峰成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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