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Three-dimensional structure carbon-coated manganese cobalt oxide nanowire material, preparation method and application

A nano-manganese cobalt oxide and three-dimensional structure technology, which is applied in nanotechnology, nanotechnology, structural parts, etc., can solve problems such as poor cycle stability, achieve controllable process, increase active sites, and low cost

Inactive Publication Date: 2018-09-28
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a three-dimensional carbon-coated manganese cobaltate nanowire material and its preparation method and application. The main technical problem to be solved is to improve the poor cycle stability of the current manganese cobaltate material in the application of lithium battery negative electrode materials. question

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  • Three-dimensional structure carbon-coated manganese cobalt oxide nanowire material, preparation method and application
  • Three-dimensional structure carbon-coated manganese cobalt oxide nanowire material, preparation method and application
  • Three-dimensional structure carbon-coated manganese cobalt oxide nanowire material, preparation method and application

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Embodiment 1

[0029] First place the copper foam in acetone, ethanol, and deionized water for 15 minutes, and then soak it in analytically pure hydrochloric acid (HCl, with a mass fraction of 36-38%) for two hours. Rinse with deionized water, and then ultrasonicate in 5% dilute hydrochloric acid solution and deionized water for 15 minutes respectively. After cleaning, freeze in a freeze dryer for 12 hours and dry for 12 hours. Cobalt nitrate hexahydrate 0.5mml (Co(NO 3 ) 2 ·6H 2 O, 99%), manganese nitrate 1mml (Mn(NO 3 ) 2 , 10mml urea (CH 4 N 2 O, 99.5%) and 0.5mml ammonium fluoride (NH 4 F, 96%) was dissolved in 40 ml of high-purity deionized water (18.25 MΩ·cm-1), and stirred by a magnetic stirrer for 30 minutes to form a pink transparent solution. Fix the copper foam on the bottom of the polytetrafluoroethylene liner, pour the above solution into a 50ml polytetrafluoroethylene liner, and put the liner into a stainless steel reaction kettle. The whole stainless steel reaction ket...

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Abstract

The invention discloses a preparation method of a three-dimensional structure carbon-coated manganese cobalt oxide nanowire material. The preparation method comprises the following specific steps: using a current collector as a base, using cobalt nitrate hexahydrate and manganese nitrate tetrahydrate as a cobalt source and a manganese source, and using deionized water, urea and ammonium fluoride as solvents; firstly using a hydrothermal method to synthesize a manganese cobalt oxide nanowire precursor; then obtaining a manganese cobalt oxide negative electrode after calcinations in argon; finally, introducing carbon source gas through chemical vapor deposition, and coating the manganese cobalt oxide nanowire material with a carbon material layer. The three-dimensional structure carbon-coated manganese cobalt oxide nanowire material disclosed by the invention is relatively large in specific surface area, sufficient contact and ion transport of an electrolyte and an active substance are facilitated, the active site of a reaction is increased, the disadvantage that a manganese cobalt oxide material is low in electrical conductivity is overcome, and when the three-dimensional structurecarbon-coated manganese cobalt oxide nanowire material service as a negative electrode for lithium ion batteries, the electrochemical performance is greatly improved, the volume expansion is relieved,and the cycling stability is strengthened.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode material preparation, and in particular relates to a three-dimensional structure carbon-coated manganese cobaltate nanowire material, a preparation method and an application. Background technique [0002] In recent years, lithium batteries have been widely used in portable electronic devices, plug-in hybrid vehicles and other electric vehicles, and people's demand for high-energy lithium batteries is increasing. Graphite has strong electronic conductivity, cheap price, high storage capacity and long cycle life, but the theoretical mass specific capacity of graphite carbon is 372mAh g -1 , the relatively low-capacity industrial graphite anode can no longer meet the requirements of the next-generation power supply. Finding new alternative materials has become an important direction for the development of lithium battery anode materials in the future. Anode materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/50H01M4/52H01M4/583H01M10/0525Y02E60/10
Inventor 张勇吴琼孙毛宽崔接武王岩刘家琴吴玉程
Owner HEFEI UNIV OF TECH
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