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Lithium battery electrode material Li2S/Co nanometer compound film and its preparation method

A technology of nanocomposite and electrode active material, applied in the field of Li2S/Co nanocomposite film and its preparation, can solve problems such as fast decay, and achieve the effects of high specific capacity, excellent electrochemical performance and simple preparation process

Inactive Publication Date: 2006-06-28
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And M.N.Obrovac et al. (M.N.Obrovac.et al.Electrochem.Solid-State Lett.5(4)A70-A73(2002)) have tried to use Li 2 S and Fe are ball milled and mixed, and then charged and discharged, but its reversible capacity is only about 170mAh / g, and it decays quickly
So far, no studies have reported that Li 2 S / Co mixtures as electrode materials for lithium-ion batteries

Method used

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  • Lithium battery electrode material Li2S/Co nanometer compound film and its preparation method

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Embodiment 1

[0013] Chemically pure Li with a molar ratio of 1:1 2 S is fully mixed with Co powder; then the mixture powder is pressed into a target material for pulse laser deposition, and a composite nano-mixture electrode film material is prepared by pulse laser deposition. Preparation conditions: the substrate is a stainless steel sheet, the distance between the substrate and the target is 40mm; the deposition process is carried out in argon, and the pressure is kept at 10Pa; the deposition temperature is room temperature; the laser wavelength is 355nm, the pulse frequency is 10Hz, the pulse width is 10ns, and the energy The density is 2J / cm -2 ; The deposition time was 0.5 hours.

[0014] According to SEM, the particle size in the deposited film is about 20nm. Indicating that the deposited film is Li 2 S / Co nanocomposite material composition. It was determined by TEM electron diffraction that the deposited film was Li 2 S / Co nano-hybrid, where Li 2 S is a face-centered cubic str...

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Abstract

This invention relates to an electrode active material used in Li ionic batteries and its preparation method, in which, the material is prepared by depositing a nm compound film made up of Li2S and a transition metal element Co with pulse laser and the size of the compound is smaller than 50nm, the specific volume is varied in the sphere of 400-650mAh / g along with the difference of Co and presents very good stability in the repeated charge / discharge process.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a 2 S / Co nanocomposite film and its preparation method. Background technique [0002] Lithium-ion batteries have attracted great attention due to their advantages such as high operating voltage and high energy density. At present, lithium-ion batteries have been widely used in electronic devices such as mobile phones, notebook computers, digital video cameras, cameras, etc., and may be used in automobiles and other vehicles as green energy. At present, the commonly used cathode materials for lithium-ion batteries are mainly LiCoO 2 , LiNiO 2 and LiMn 2 o 4 Wait. Although this type of cathode material has good electrochemical performance, it is restricted by factors such as high price, low specific capacity, complicated preparation and purification process, especially the problem of low specific capacity, which seriously limits its better development. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36C23C14/22H01M4/38H01M4/58
CPCY02E60/10
Inventor 周永宁傅正文吴晓京
Owner FUDAN UNIV
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