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Preparation of carbon-coated hollow bismuth nanomaterials and their application in alkaline batteries

An alkaline battery, carbon coating technology, applied in the direction of alkaline storage battery, battery electrode, nanotechnology, etc., can solve the problems of poor chemical structure stability, metal bismuth simple substance is easy to be corroded and oxidized, etc., to achieve stable product structure and properties, Excellent rate performance and cycle durability, low cost effect

Active Publication Date: 2020-02-07
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal bismuth is easily corroded and oxidized in the electrolyte environment, and its chemical structure stability is poor, which has become a fatal problem for the further application and development of this material

Method used

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  • Preparation of carbon-coated hollow bismuth nanomaterials and their application in alkaline batteries
  • Preparation of carbon-coated hollow bismuth nanomaterials and their application in alkaline batteries
  • Preparation of carbon-coated hollow bismuth nanomaterials and their application in alkaline batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 Synthesis of carbon-coated metal nano-hollow bismuth negative electrode material

[0028] (1) Bismuth ammonium fluoride (NH 4 Bi 3 f 10 ) precursor synthesis: take 0.2 g Bi(NO 3 ) 3 ·6H 2 O and 0.6 g of NH 4 F were placed in 25 mL ethylene glycol centrifuge tubes for vortex dissolution. The above two solutions were mixed evenly, and after standing at room temperature for 12 hours, after filtering and washing, at 60 o Dry the sample at C for 8 hours to obtain NH 4 Bi 3 f 10 precursor material.

[0029] (2) Synthesis of carbon-coated metal nano-hollow bismuth anode material: take 0.4 g NH 4 Bi 3 f 10 Added to the solution containing 0.1 g dopamine molecules, stirred at room temperature for 6 hours, centrifuged and washed with absolute ethanol several times, and then at 60 o C dried the sample for 8 hours to obtain gray NH 4 Bi 3 f 10 @PDA nanopowder. Next, in an argon atmosphere at 400 o C low-temperature carbonization for 30 minutes to obtain...

Embodiment 2

[0031] Example 2 Production and Test Method of Alkaline Full Battery Using Carbon-coated Metal Nano Hollow Bismuth as Negative Electrode

[0032] (1) Negative electrode sheet production: After mixing the negative electrode material, conductive agent and binder in a mass ratio of 8:1:1, add an appropriate amount of N-methylpyrrolidone solvent and stir for 12 hours to obtain a black viscous slurry material. Spread the slurry evenly on the foamed nickel collector electrode with a scraper, 120o C vacuum dried for 12 hours to obtain the negative electrode sheet.

[0033] (2) Electrode sheet activation and testing: The electrode sheet prepared in step (2) was used as the working electrode, Ag / AgCl and platinum wire were used as the reference electrode and counter electrode, and 6 mol / L sodium hydroxide solution was used as the electrolytic electrode. The electrode prepared in step (2) was scanned cyclically for 100-200 circles on the electrochemical workstation at a scan rate of 50...

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Abstract

The invention relates to preparation of a carbon-coated nano hollow bismuth monomer and researches of application of the carbon-coated nano hollow bismuth monomer to an alkaline battery and belongs tothe technical field of the alkaline batteries. Nano metal bismuth has good electrical conductivity and electrochemical properties, but the nano metal bismuth has relatively poor structural stabilityin an electrolyte environment. In order to improve the stability and the circulating efficiency, the invention provides an effective method for limiting the nano metal bismuth in a carbon micro-reactor; the method specifically comprises the following steps: firstly, synthesizing a hollow fluorine bismuth ammonium (NH4Bi3F10) precursor through a room-temperature liquid phase method; secondly, polymerizing at room temperature by utilizing a dopamine molecule, so as to realize carbon coating of the precursor; finally, carrying out low-temperature carbonization treatment on an obtained product, soas to obtain the carbon-coated nano hollow bismuth monomer. When the carbon-coated nano hollow bismuth monomer is applied to the alkaline battery, the compound has excellent rate performance and circulating durability. According to the method provided by the invention, a preparation process is very simple, large-scale production is easy to realize and the product has stable structural propertiesso that the method has a practical prospect and commercial value.

Description

technical field [0001] The invention belongs to the technical field of alkaline batteries, and in particular relates to a preparation method and application of an alkaline battery negative electrode material. Background technique [0002] With the increasingly serious problems of fossil energy depletion and environmental degradation, the development and utilization of green energy (including wind energy, tidal energy and solar energy, etc.) has become particularly important. Although these energy sources can be converted into electrical energy and are sustainable, their utilization is often restricted by external factors such as time, location, and weather. To facilitate the needs of daily life, developing battery systems to collect converted electrical energy is currently the most effective strategy. In recent years, lithium batteries have dominated the field of rechargeable energy storage. However, lithium batteries are currently facing many serious problems. In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/24B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/628H01M10/24H01M2004/027Y02E60/10
Inventor 蒋建栗林坡朱建慧
Owner SOUTHWEST UNIV
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