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A nano three-dimensional conductive framework/mno 2 Preparation method of composite structural material and its application in positive electrode of zinc battery

A composite structure, zinc-ion battery technology, applied in battery electrodes, nanotechnology, structural parts, etc., can solve the problems of poor cycle performance, high cost, complex process, etc., and achieve high specific capacity, low cost, simple and environmentally friendly process Effect

Active Publication Date: 2020-11-20
浙江浙能中科储能科技有限公司
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Problems solved by technology

[0006] In view of the poor cycle performance of existing manganese dioxide materials and the complex process and high cost of material modification, the purpose of the present invention is to provide a high-performance porous hollow nanometer three-dimensional battery with controllable morphology in the field of zinc-ion batteries. Conductive framework / MnO 2 Composite structure positive electrode material and its preparation method and application

Method used

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  • A nano three-dimensional conductive framework/mno <sub>2</sub> Preparation method of composite structural material and its application in positive electrode of zinc battery
  • A nano three-dimensional conductive framework/mno <sub>2</sub> Preparation method of composite structural material and its application in positive electrode of zinc battery
  • A nano three-dimensional conductive framework/mno <sub>2</sub> Preparation method of composite structural material and its application in positive electrode of zinc battery

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preparation example Construction

[0040] Preparation of metal organic framework compounds. It mainly uses organic ligands and metal salt solutions as raw materials, and is formed by cross-linking through a liquid phase reaction method (the temperature of the liquid phase reaction method is 20-80° C., and the time is 2-24 hours). The organic ligand can be terephthalic acid, 2-methylimidazole or trimesic acid and the like. The metal salt can be any one of nickel nitrate, cobalt nitrate and iron nitrate or a mixture thereof. The molar ratio of the metal salt to the organic ligand may be 1:1˜1:5.

[0041] Preparation of nano-sized three-dimensional conductive framework substrates. Wherein, the nano three-dimensional conductive skeleton substrate may be in the form of porous hollow nanocubes, porous hollow dodecahedrons, porous hollow nanorods, and the like. The nanometer three-dimensional conductive framework substrate is obtained after high-temperature carbonization of metal organic framework compounds in an i...

Embodiment 1

[0047] (1) Weigh 1g of 2-methylimidazole and dissolve it in 25ml of deionized water, and call it solution A; in addition, weigh 0.3g of cobalt nitrate and dissolve it in 25ml of deionized water, and call it solution B. The two solutions of A and B were mixed and stirred for 2 hours, then stood at 25°C for 24 hours, the precipitate was centrifuged and washed, and the resulting precipitated product was collected;

[0048] (2) Place the precipitated product of step (1) in an oven at 70°C and dry for 10 hours to obtain a metal-organic framework compound (ZIF-67) powder with a nanocube structure, Figure 1a The SEM picture of its microstructure, it can be seen from the picture that the metal organic framework compound is in the shape of nano cubes, the average particle size is about 500nm, and the dispersion performance is good;

[0049] (3) Heat the metal organic framework compound powder material obtained in step (2) to 600° C. under an argon atmosphere, and keep it warm for 5 hou...

Embodiment 2

[0054] (1) Weigh 0.35g of 2-methylimidazole and dissolve it in 25ml of methanol, and call it solution A; in addition, weigh 0.2g of cobalt nitrate and dissolve it in 25ml of methanol, and call it solution B. The two solutions of A and B were mixed and stirred for 2 hours, then left to stand for 24 hours, the precipitate was centrifuged and washed, and the resulting precipitated product was collected;

[0055] (2) Place the precipitated product of step (1) in an oven at 70° C. for 10 hours to dry to obtain a metal-organic framework compound (ZIF-67) powder with a nano-dodecahedral structure;

[0056] (3) The metal-organic framework compound powder material with nano-dodecahedral structure obtained in step (2) is heated to 600° C. under an argon atmosphere, and kept for 5 hours. After carbonization, porous dodecahedral-shaped nano Three-dimensional conductive framework material; (4) Weigh 0.3g of the nanometer three-dimensional conductive framework material obtained in step (3),...

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Abstract

The invention provides a preparation method of a nano three-dimensional conductive framework / MnO2 composite structure material and application of the nano three-dimensional conductive framework / MnO2 composite structure material in a zinc battery positive electrode. The positive electrode material of the porous and hollow nano three-dimensional conductive framework / MnO2 composite structure materialcomprises a nano three-dimensional conductive framework, and an MnO2 material being subjected to in-situ growth at the surface of the nano three-dimensional conductive framework substrate. The nano three-dimensional conductive framework substrate is obtained by carbonizing a metal organic framework compound in an inert atmosphere at a temperature of 400-1000 DEG C.

Description

technical field [0001] The invention relates to a porous hollow nano three-dimensional conductive framework / MnO 2 The preparation method of composite structure cathode material and its application in zinc ion battery cathode belong to the technical field of zinc ion battery. Background technique [0002] Energy crisis and environmental pollution are the two major problems that countries in the world are facing at present, so the development of green and environmentally friendly new energy technologies will become increasingly urgent. At present, as a new energy technology, lithium-ion batteries are widely used in many fields such as electronic equipment and vehicles. However, due to the shortage of lithium resources, high cost, and poor safety performance, the development of new high The new battery will become the key research direction in the battery field. [0003] Rechargeable aqueous Zn / MnO 2 The battery uses metal zinc as the negative electrode (theoretical specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/625H01M10/054Y02E60/10
Inventor 刘宇刘云召李卓斌姚思澄韩奇
Owner 浙江浙能中科储能科技有限公司
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