Composite flexible electrode as well as preparation method and application thereof

A flexible electrode and flexible technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of the positive conductivity to be improved, and achieve good application development prospects, increase the contact area, and reduce the effect of diffusion distance.

Active Publication Date: 2018-07-06
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Abstract
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Problems solved by technology

However, the conductivity of the positive electr

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  • Composite flexible electrode as well as preparation method and application thereof
  • Composite flexible electrode as well as preparation method and application thereof
  • Composite flexible electrode as well as preparation method and application thereof

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preparation example Construction

[0044] Correspondingly, the present application provides a method for preparing a composite flexible electrode, comprising the following steps: mixing sheet-like manganese dioxide and graphene and depositing it on a flexible current collector to obtain a composite flexible electrode.

[0045] In an embodiment of the present invention, the flaky manganese dioxide is prepared by a hydrothermal method; the size of the flaky manganese dioxide is 100nm-200nm. In the embodiment of the present invention, the manganese source compound is subjected to hydrothermal reaction in water, specifically, potassium permanganate (KMnO 4 ) and ammonium chloride (NH 4 Cl), mixed and dispersed in water at a molar ratio of 1:1, preferably hydrothermally reacted at 140° C. for 24 hours to obtain a precursor. Then, in the embodiment of the present invention, the obtained reaction product is filtered, washed, dried, and the sample is annealed, such as placed in an annealing furnace and heated at 300° ...

Embodiment 1

[0067] 1. Preparation of flaky manganese dioxide

[0068] 0.1264g KMnO 4 and 0.0428g NH 4Cl was mixed and dispersed in 40 mL of deionized water, moved to an autoclave, and reacted hydrothermally at 140° C. for 24 hours. After the hydrothermal reaction is finished, cool to room temperature, filter the reaction product, and wash repeatedly with absolute ethanol and deionized water. After drying at 60° C. for 2 hours, the sample was placed in an annealing furnace and heated at 300° C. for 1 hour in an air atmosphere to obtain 50 mg of flaky manganese dioxide. The SEM of the obtained flaky manganese dioxide is as image 3 shown by image 3 It can be seen that the prepared manganese dioxide is in the shape of nano flakes, and the size is 100nm-200nm.

[0069] 2. Preparation of sheet-like manganese dioxide and graphene composite electrodes

[0070] Mix and disperse 6 mg of the obtained flaky manganese dioxide and 1.5 mg of reduced graphene oxide (rGO, supplier: XF NANO, sheet ...

Embodiment 2

[0079] 0.1264g KMnO 4 and 0.0428g NH 4 Cl was mixed and dispersed in 40 mL of deionized water, moved to an autoclave, and reacted hydrothermally at 140° C. for 24 hours. After the hydrothermal reaction is finished, cool to room temperature, filter the reaction product, and wash repeatedly with absolute ethanol and deionized water. After drying at 60°C for 2 hours, the sample was placed in an annealing furnace and heated at 300°C for 1 hour in an air atmosphere to obtain flaky manganese dioxide. The prepared manganese dioxide is in the shape of nano flakes, and the size is 100nm-200nm.

[0080] Mix and disperse 6 mg of the obtained flaky manganese dioxide and 1.06 mg of reduced graphene oxide (rGO, supplier: XF NANO, sheet diameter 0.5 μm-5 μm, thickness 0.8 nm-1.2 nm) in 3 mL isopropanol solution, Ultrasound for 2 hours, and then use vacuum filtration to deposit the flake manganese dioxide and rGO mixture on conductive carbon cloth (1cm×2cm, thickness 0.33mm, resistance les...

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Abstract

The invention provides a composite flexible electrode as well as a preparation method and application thereof. The composite flexible electrode comprises a flexible current collector, flaky manganesedioxide compounded on the flexible current collector, and graphene. The composite flexible electrode as well as the preparation method and the application thereof provided by the invention have the benefits that the flaky manganese dioxide is mainly taken as an active substance, and the grapheme is taken as an electrical conductive agent, so that the electrical conductivity of the electrode can beimproved, the contact area of an electrolyte with the electrode is increased at the same time, and the diffusion distance of ions is reduced; therefore, the specific capacity and the rate performanceof a battery are improved. The invention further provides a flexible zinc ion battery and a preparation method thereof; the battery comprises the electrode and has good application and development prospects in aspects of portable foldable flexible electronics and energy devices. According to the embodiment of the invention, the flaky manganese dioxide and grapheme composite electrode is preparedby using a vacuum filtration method, a bonding agent is not required to be added, and the mass proportion of the active substance in the whole electrode is favorably improved, so that the energy density of the battery is improved. The preparation method provided by the invention is simple and is favorable for reduction in manufacturing cost.

Description

technical field [0001] The present invention relates to the technical field of preparation of flexible zinc-ion batteries, in particular to a composite flexible electrode, its preparation method and application, in particular to the preparation of a flexible zinc-ion battery with a sheet-like manganese dioxide and graphene composite electrode as the positive electrode method. Background technique [0002] Zinc-ion batteries (such as Zn / MnO 2 ) has the advantages of high theoretical energy density, good safety, and low cost, and has broad application prospects in high-performance electronic devices and other devices. The development of high-performance flexible zinc-ion batteries can better meet the performance requirements of flexible electronic devices for flexible energy storage devices. In flexible batteries, electrodes with mechanical flexibility are one of the core components, which need to provide electronically conductive framework and ion diffusion channels at the s...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M4/50H01M4/62H01M10/38
CPCH01M4/50H01M4/625H01M10/36H01M10/38Y02E60/10Y02P70/50
Inventor 周航黄媛刘久炜
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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