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Composite lithium metal negative pole and preparation method thereof

A metal negative electrode, composite lithium technology, applied in the direction of negative electrode, battery electrode, lithium battery, etc., can solve the problems of inability to expand, complex modification, etc.

Inactive Publication Date: 2020-01-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most modifications are still complex and cannot be extended

Method used

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  • Composite lithium metal negative pole and preparation method thereof
  • Composite lithium metal negative pole and preparation method thereof
  • Composite lithium metal negative pole and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Example 1: 0.5 g catkins were washed with deionized water, added to 150 ml of 0.5 M nitric acid, and stirred at 300 rpm for 10 h. Catkin flakes were obtained after vacuum filtration, and the flakes were dried in a vacuum oven at 80° C. for 10 h. Put the sheet into a tube furnace, heat up to 800C at 5°C / min in an argon atmosphere, keep it warm for 2h, and cool down to room temperature naturally to obtain a three-dimensional thin carbon sheet. Heat the lithium sheet to 300°C to melt, put in the carbon sheet, wait until the metal lithium is completely impregnated, take it out and cool it down to room temperature naturally to obtain a composite lithium metal negative electrode, in which the metal lithium content is 83%. figure 1 A flow chart showing the preparation of the composite lithium metal negative electrode;

[0028] Assemble the battery with the composite lithium metal negative electrode and the counter electrode lithium sheet, and discharge it to 1V at a current d...

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Abstract

The invention belongs to the field of lithium batteries and relates to a composite lithium metal negative pole and a preparation method thereof. According to the preparation method, metal lithium is heated to a molten state in an argon-shielded glove box; a three-dimensional carbon sheet is made to contact with the molten lithium; after the three-dimensional carbon sheet is completely impregnatedby the metal lithium, the three-dimensional carbon sheet is taken out and is cooled to room temperature, so that the composite lithium metal negative pole is obtained. According to a three-dimensionalcarbon current collector, natural biomass catkin is used as a raw material; the natural biomass catkin is subjected to suction filtration and carbonization treatment, so that the three-dimensional carbon sheet is obtained; the carbonized catkin contains a large number of heteroatoms (mainly N and O), meanwhile, a hollow tubular structure is reserved; and the molten metal lithium can be easily injected into the whole three-dimensional network through capillarity; and the formed three-dimensional conductive carbon frame and rich space not only induce the uniform deposition of lithium, but alsocan adapt to volume change, so that the stable lithium metal negative pole can be obtained.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a composite lithium metal negative electrode and a preparation method thereof. Background technique [0002] Due to the limited energy density of traditional lithium-ion batteries, they face great challenges in the application of electric vehicles and grid energy storage. For the development of lithium-ion batteries with high energy density, high specific capacity and stable electrode materials are essential. [0003] Lithium metal is considered as an ideal anode material due to its high theoretical specific capacity (3860mAh / g) and low redox potential (-3.04V). [0004] However, lithium metal anodes are prone to serious dendrite problems and large volume expansion during repeated charge-discharge cycles, resulting in continuous rupture and regeneration of the solid electrolyte interlayer (SEI), resulting in a decrease in Coulombic efficiency and a sharp capacity dec...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/583H01M10/052
CPCH01M4/134H01M4/1395H01M4/362H01M4/382H01M4/583H01M10/052H01M2004/027Y02E60/10
Inventor 许运华程明仁
Owner TIANJIN UNIV
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