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A kind of lithium-sulfur battery negative electrode material and preparation method thereof

A negative electrode material, lithium-sulfur battery technology, applied in the manufacture of battery electrodes, lithium batteries, electrolyte batteries, etc., can solve problems such as complex operation process, achieve large effective discharge area, good cycle performance and rate performance, and high porosity Effect

Active Publication Date: 2018-03-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By using LiF coated lithium powder (J Power Sources, 2008, 178,769-773), electrodepositing metal lithium (JElectrochemSoc, 2000, 147: 517-523), adding a protective layer on the surface of lithium foil (CN 10398584 A), etc., the Improve cycle efficiency and cycle life, but the operation process is also more complicated

Method used

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  • A kind of lithium-sulfur battery negative electrode material and preparation method thereof
  • A kind of lithium-sulfur battery negative electrode material and preparation method thereof
  • A kind of lithium-sulfur battery negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0034] Compared with Comparative Example 2, in Example 1, the mass ratio of steady-state lithium powder, hard carbon, and polyvinylidene fluoride was changed to 8:1:1 during the preparation of the negative electrode sheet, and the rest of the operations and descriptions were the same as those of Comparative Example 2.

Embodiment 2

[0036] Compared with Comparative Example 2, in Example 2, the mass ratio of steady-state lithium powder, hard carbon, and polyvinylidene fluoride was changed to 7:2:1 during the preparation of the negative electrode sheet, and the rest of the operations and descriptions were the same as those of Comparative Example 2.

Embodiment 3

[0038] Compared with Comparative Example 2, in Example 3, the mass ratio of steady-state lithium powder, hard carbon, and polyvinylidene fluoride was changed to 6:3:1 during the preparation of the negative electrode sheet in Example 3, and the rest of the operations and descriptions were the same as those of Comparative Example 2.

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Abstract

The invention relates to a lithium-sulfur battery negative electrode material and a preparation method thereof. The lithium-sulfur battery negative electrode material is prepared by mixing stable lithium powder and carbon. The battery prepared by this method exhibits small impedance, can effectively weaken the shuttle effect and dendrite growth during continuous charge and discharge, and exhibits better cycle performance and rate performance than conventional metal lithium foil.

Description

technical field [0001] The invention relates to the field of preparation of lithium-sulfur battery electrode materials, in particular to a lithium-sulfur battery and a preparation method thereof. Specifically, stable lithium powder and carbon are used as its anode materials instead of conventional metal lithium foil. Background technique [0002] In order to cope with the global energy shortage and environmental changes, and to make better use of clean and sustainable energy such as wind energy and solar energy, lithium-sulfur batteries with high energy density and pollution-free have attracted widespread attention. [0003] Elemental sulfur is non-toxic, has abundant global reserves, and has a high theoretical specific capacity (1675mAh / g). Lithium metal has a low density (0.534g / cm 3 ), low potential (-3.045v) and high specific capacity (3861mAh / g), so lithium-sulfur batteries can achieve high energy density, which can play an important role in energy storage and renewab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/38H01M10/052H01M10/058
CPCH01M4/134H01M4/382H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 田艳红樊开乐张学军
Owner BEIJING UNIV OF CHEM TECH