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A metal lithium anode with a high specific surface protection layer and a preparation method thereof

A high specific surface area, metal lithium technology, applied in battery electrodes, electrode carriers/current collectors, structural parts, etc., can solve problems such as poor cycle performance, achieve high porosity, simple preparation, and strong industrial applicability

Inactive Publication Date: 2019-01-25
浙江浙能中科储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of lithium dendrite formation and poor cycle performance during the charging and discharging process of the lithium negative electrode, the present invention uses nano-conductive carbon materials for the first time to prepare the protective layer of the metal lithium negative electrode, and provides a metal with a high specific surface porous protective layer. Lithium negative electrode and preparation method thereof

Method used

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  • A metal lithium anode with a high specific surface protection layer and a preparation method thereof
  • A metal lithium anode with a high specific surface protection layer and a preparation method thereof
  • A metal lithium anode with a high specific surface protection layer and a preparation method thereof

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Embodiment 1

[0036] The carbon nanofibers were dried in an oven at 60° C. for 10 h, and then styrene-butadiene rubber (SBR) was dissolved in a toluene solution to obtain a SBR / toluene solution, so that the mass concentration of the styrene-butadiene rubber was 2%. The dried carbon fiber (1g) is added into SBR / toluene solution (5g) and stirred evenly. In a glove box full of argon, this solution is evenly sprayed on the surface of the lithium metal sheet, and finally the lithium metal sheet obtained is placed in the Dry in an oven at 60°C for 10 h. A metal lithium negative electrode with a carbon fiber film protective layer was obtained, and the thickness of the carbon fiber protective layer was 50 microns. figure 1 shows the schematic diagram of the prepared carbon fiber layer / lithium anode structure, from figure 1 It can be seen that carbon fibers with a diameter of 1-10 microns and a length of 20-100 microns are evenly distributed on the surface of the metal lithium negative electrode. T...

Embodiment 2

[0038] The carbon fibers were dried in an oven at 60° C. for 10 h, and then styrene-butadiene rubber (SBR) was dissolved in a xylene solution to obtain an SBR / xylene solution, so that the mass concentration of the styrene-butadiene rubber was 2%. Add the dried carbon fiber (1g) into the SBR / xylene solution (5g) and stir evenly. In a glove box full of argon, this solution is evenly sprayed on the surface of the metal lithium sheet, and finally the obtained metal lithium sheet Dry in an oven at 60 °C for 10 h. A metal lithium negative electrode with a carbon nanotube protective layer is obtained. The thickness of the carbon nanotube protective layer is 50 microns.

Embodiment 3

[0040] The carbon fiber was dried in an oven at 60° C. for 10 h, and then polyvinylidene fluoride (PVDF) was dissolved in a solution of methylpyrrolidone (NMP) to obtain a PVDF / NMP solution, so that the mass concentration of polyvinylidene fluoride was 2%. Add the dried carbon fiber (1g) into the PVDF / NMP solution (5g) and stir evenly. In a glove box full of argon, this solution is evenly sprayed on the surface of the lithium metal sheet. Finally, the lithium metal sheet obtained is placed in the Dry in an oven at 60°C for 10 h. A metal lithium negative electrode with a carbon fiber protective layer was obtained. The thickness of the carbon fiber protective layer is 50 microns.

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Abstract

The invention relates to a metal lithium negative electrode with a high specific surface protective layer and a preparation method thereof. The metal lithium negative electrode comprises a substrate and a protective layer formed of a nano-conductive carbon material, which is carbon nanofibers or / and carbon nanotubes, and is coated on the surface of the substrate. The metal lithium with high specific surface area protection layer provided by the invention has obvious protection effect, low cost, simple preparation, easy industrialization and strong industrial application.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a metal lithium negative electrode with a high specific surface protection layer and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of mobile electronic devices, the energy density requirements of batteries are getting higher and higher, and traditional lithium batteries can no longer meet the needs of human beings. Compared with the traditional lithium-ion battery, the theoretical specific capacity of metal lithium is as high as 3860mAh g-1, which is one of the electrode materials with the highest mass specific energy known at present, and the electrode potential is -3.045V (vs. NHE). Therefore, metal lithium has been widely concerned by researchers as the negative electrode of lithium batteries. [0003] People's research on lithium metal as a negative electrode material for batteries began in the 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/66H01M4/134H01M4/583H01M4/62H01M10/0525
CPCH01M4/134H01M4/382H01M4/583H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 刘宇刘崇武张娜夏骥姚思澄
Owner 浙江浙能中科储能科技有限公司
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