Black phosphorus / reduced graphene oxide composite electrode, preparation method thereof, and flexible lithium ion battery including the composite electrode

A lithium-ion battery and graphene composite technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., to achieve the effects of low energy consumption, high yield, and enhanced mechanical flexibility

Active Publication Date: 2019-10-29
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H. Xu, et al published a flexible capacitor using carbon nanofibers as the electrode substrate in "Adv. Energy Mater." 5 (2015) 1401882. Although it can achieve 4000 stable cycles, its energy density is only 11Wh. kg -1

Method used

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  • Black phosphorus / reduced graphene oxide composite electrode, preparation method thereof, and flexible lithium ion battery including the composite electrode
  • Black phosphorus / reduced graphene oxide composite electrode, preparation method thereof, and flexible lithium ion battery including the composite electrode
  • Black phosphorus / reduced graphene oxide composite electrode, preparation method thereof, and flexible lithium ion battery including the composite electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Material

[0061]The following reagents and solvents were used without further purification: polyacrylonitrile (PAN, Mw=150,000, Sigma-Aldrich), N,N-dimethylformamide (DMF, 99.8%, Sigma-Aldrich), hydrochloric acid (37%, Fisher), nitric acid (69-72%, Fisher), N-methylpyrrolidone (NMP), PVDF-HFP (average Mw ~ 455,000, Sigma-Aldrich), sulfuric acid (98%, Fisher), hydrogen peroxide (30% , Fisher), potassium permanganate (97%, Sigma-Aldrich), vanadium pentoxide (>98%, Sigma-Aldrich), polydimethylsiloxane (Sigma-Aldrich), acetone (Fisher).

[0062] characterize

[0063] The morphology was characterized using scanning electron microscopy (SEM, JEOL7100F) and transmission electron microscopy (TEM, JEOL2010). Electrochemical performance was measured on a battery test system (Land 2001CT).

[0064] Manufacturing method

[0065] In Example 1, the BP / rGO electrode was prepared by vacuum filtration and mild reduction of the BP / GO dispersion. Synthesis of V by hydrothermal...

Embodiment 2

[0079] Prepare flexible lithium-ion battery in a manner similar to Example 1, the difference is: change the amount of black phosphorus sheet dispersion and graphene oxide sheet to make the black phosphorus sheet and the quality of graphene oxide sheet in the black phosphorus sheet dispersion The ratio is 1:1. Then, in a manner similar to Example 1, the cycle performance of the prepared BP / graphene negative electrode was tested.

Embodiment 3

[0081] Prepare flexible lithium-ion battery in a manner similar to Example 1, the difference is: change the amount of black phosphorus sheet dispersion and graphene oxide sheet to make the black phosphorus sheet and the quality of graphene oxide sheet in the black phosphorus sheet dispersion The ratio is 1:2. Then, in a manner similar to Example 1, the cyclability of the prepared BP / graphene negative electrode was tested.

[0082] image 3 The cycle and rate performance test results according to Examples 2 and 3 are given, and the results show that the BP / rGO negative electrodes with a BP / GO ratio of 1:1 and 1:2 can provide better cycle performance and specific capacity, namely , the BP / rGO anode with a BP / GO ratio of 1:2 maintained a specific capacity of 477mAh g-1 after 500 cycles, and the average Coulombic efficiency was 99.6%; and the BP / rGO with a BP / GO ratio of 1:2 The negative electrode maintains a specific capacity of 329mAh·g-1 after 500 cycles, and the average Coul...

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Abstract

The invention provides a method for preparing a black phosphorus / reduced graphene oxide composite electrode, and the method comprises the following steps: i) peeling black phosphorus into a black phosphorus flake dispersion in a solution; ii) expanding and oxidizing the bulk graphite to form a graphene oxide sheet; ii) mixing the black phosphorus flake dispersion liquid and the graphene oxide flakes to form a uniform dispersion liquid; iv) vacuum filtering the uniform dispersion liquid to form black phosphorus / graphene oxide A film; and v) chemically reducing, drying, and optionally prelithiating the black phosphorus / graphene oxide film to form the flexible black phosphorus / reduced graphene oxide composite electrode. In addition, the present invention also provides a black phosphorus / reduced graphene oxide composite electrode and a flexible lithium ion battery including the composite electrode. The flexible lithium ion battery according to the present invention has both a high-quality energy density and a high volume energy density, and there is no significant attenuation after 100 cycles in a working bending state.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 762,114, filed April 23, 2018, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to several layers of black phosphorus / reduced graphene oxide (hereinafter referred to as BP / rGO) composite electrode (or called composite film, composite paper or negative pole) and its preparation method and the use of the BP / rGO negative pole, V 2 o 5 / CNT cathode and polymer electrolyte to assemble the flexible lithium-ion battery (LIB). Background technique [0004] To facilitate the rapid and widespread development of flexible and wearable electronics, the development of flexible energy storage devices with high energy density is required. Current flexible energy storage devices are mainly aqueous supercapacitors, because the electrodes and electrolytes of supercapacitors can be easily made ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1393H01M4/36H01M4/38H01M4/587H01M4/62H01M4/13H01M4/133H01M4/485H01M10/0525
CPCH01M4/139H01M4/1393H01M4/366H01M4/38H01M4/587H01M4/625H01M4/13H01M4/133H01M4/362H01M4/485H01M10/0525Y02E60/10
Inventor 金章教崔江姚姗姗
Owner THE HONG KONG UNIV OF SCI & TECH
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