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Surface-modified lithium metal negative electrode material and preparation method thereof

A technology of surface modification and negative electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low Coulombic efficiency, achieve simple preparation methods, improve Coulombic efficiency and discharge capacity, and reduce polarization Effect

Inactive Publication Date: 2016-11-09
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned problems in the prior art, the present invention provides a surface-modified metal lithium negative electrode material and a preparation method thereof, wh

Method used

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  • Surface-modified lithium metal negative electrode material and preparation method thereof
  • Surface-modified lithium metal negative electrode material and preparation method thereof
  • Surface-modified lithium metal negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0029] A surface-modified metallic lithium negative electrode material, the preparation method of which comprises the following steps:

[0030] (1) iodic acid is dissolved in anhydrous dimethyl sulfoxide, so that the mass concentration of iodic acid is 0.1%;

[0031] (2) Lithium metal is placed in an anhydrous and oxygen-free glove box filled with argon, and then the surface of lithium metal is polished until the surface reveals a metallic luster;

[0032] (3) Soak the polished lithium metal in the solution obtained in step (1) for 5 min.

Embodiment 2

[0034] A surface-modified metallic lithium negative electrode material, the preparation method of which comprises the following steps:

[0035] (1) Ortho-periodic acid is dissolved in anhydrous tetrahydrofuran, so that the mass concentration of iodic acid is 0.2%;

[0036] (2) Lithium metal is placed in an anhydrous and oxygen-free glove box filled with argon, and then the surface of lithium metal is polished until the surface reveals a metallic luster;

[0037] (3) Soak the polished lithium metal in the solution obtained in step (1) for 30 min.

Embodiment 3

[0039] A surface-modified metallic lithium negative electrode material, the preparation method of which comprises the following steps:

[0040] (1) Metaperiodic acid is dissolved in anhydrous N-methylpyrrolidone, so that the mass concentration of iodic acid is 0.3%;

[0041] (2) Lithium metal is placed in an anhydrous and oxygen-free glove box filled with argon, and then the surface of lithium metal is polished until the surface reveals a metallic luster;

[0042] (3) Soak the polished lithium metal in the solution obtained in step (1) for 60 min.

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Abstract

The invention discloses a surface-modified lithium metal negative electrode material. A preparation method of the surface-modified lithium metal negative electrode material comprises the following steps: (1) dissolving an iodic acid substance in an anhydrous inert organic solvent, wherein the mass concentration of the iodic acid substance is 0.1% to 0.4%; (2) putting lithium metal in a water-free and oxygen-free glove box being full of argon, and polishing the surface of the lithium metal till the surface of the lithium metal shows metallic luster; (3) putting the polished metal lithium in the solution obtained in the step (1) for 5 to 60 minutes. According to the surface-modified lithium metal negative electrode material prepared according to the preparation method, the state of the surface of the lithium metal can be changed, so that the coulombic efficiency and the discharge capacity of a lithium battery adopting the surface-modified lithium metal negative electrode material can be improved effectively, the polarization of a lithium secondary battery can be reduced, and the service life of the lithium secondary battery can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a surface-modified metal lithium negative electrode material and a preparation method thereof. Background technique [0002] Lithium metal sheet is an indispensable negative electrode material for lithium batteries, and with the rapid development of mobile electronic devices, the energy density requirements of batteries are getting higher and higher. Lithium metal negative electrode materials have extremely high specific capacity, so lithium metal secondary The development and utilization of batteries has become a research hotspot. However, due to the high activity of metallic lithium itself and the problem of lithium dendrites, the development of lithium secondary batteries has been restricted. At present, there are mainly the following problems in the use of lithium metal sheet as the negative electrode of lithium batteries: (1) Li dendrites are e...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/0525
CPCH01M4/382H01M10/0525Y02E60/10
Inventor 李晶泽贾维尚樊聪王丽平周爱军
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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