Lithium-free dendrite anode with carbon nanotube film directly compounded with molten lithium metal and preparation method thereof

A technology of carbon nanotube film and lithium dendrite, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reducing battery capacity and cycle stability, consuming electrolyte, and occupying three-dimensional hosts Problems such as internal space, to achieve significant beneficial effects and increase energy density

Active Publication Date: 2021-11-30
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, due to the chemical reaction between them and lithium metal, the product has a large weight and volume, which occupies the internal space of the three-dimensional host and reduces the energy density of the battery; on the other hand, impurities may participate in the electrochemical reaction, consume the electrolyte, and reduce the energy density of the battery. capacity and cycle stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1, preparing a carbon nanotube film-lithium foil-carbon nanotube film sandwich structure material. Firstly, by chemical vapor deposition method, the thickness is 50 μm, the area is 900 cm 2 The carbon nanotube film serves as a three-dimensional carbon host framework. Cut the prepared carbon nanotube film into two pieces of equal size with an area of ​​25 cm 2 carbon nanotube film. In the glove box (H 2 O≤0.1 ppm; O 2 ≤0.1 ppm), the two cut-out carbon nanotube films were pasted on the top and bottom of the lithium foil of the same size, and finally a carbon nanotube film-lithium foil-carbon nanotube film with a sandwich structure was obtained s material.

[0020] In the second step, temperature gradient control is used to realize the infiltration and compounding of the molten lithium metal and the carbon nanotube film. In the glove box (H 2 O≤0.1 ppm; O 2 ≤0.1 ppm), a heating area of ​​100 cm 2 The heater temperature is set at 180 o C, placing the sandwich...

Embodiment 2

[0025] Step 1, preparing a carbon nanotube film-lithium foil-carbon nanotube film sandwich structure material. Firstly, by chemical vapor deposition method, the thickness is 40 μm and the area is 500 cm 2 The carbon nanotube film serves as a three-dimensional carbon host framework. Cut the prepared carbon nanotube film into two pieces of equal size with an area of ​​10 cm 2 carbon nanotube film. In the glove box (H 2 O≤0.1 ppm; O 2 ≤0.1 ppm), the two cut-out carbon nanotube films were pasted on the top and bottom of the lithium foil of the same size, and finally a carbon nanotube film-lithium foil-carbon nanotube film with a sandwich structure was obtained s material.

[0026] In the second step, temperature gradient control is used to realize the infiltration and compounding of the molten lithium metal and the carbon nanotube film. In the glove box (H 2 O≤0.1 ppm; O 2 ≤0.1 ppm), a heating area of ​​200 cm 2 The heater temperature is set at 230 o C, placing the sandw...

Embodiment 3

[0031] Step 1, preparing a carbon nanotube film-lithium foil-carbon nanotube film sandwich structure material. First, a 60 μm-thick, 400-cm-area film was prepared by chemical vapor deposition. 2 The carbon nanotube film serves as a three-dimensional carbon host framework. Cut the prepared carbon nanotube film into two pieces of equal size with an area of ​​16 cm 2 carbon nanotube film. In the glove box (H 2 O≤0.1 ppm; O 2 ≤0.1 ppm), the two cut-out carbon nanotube films were pasted on the top and bottom of the lithium foil of the same size, and finally a carbon nanotube film-lithium foil-carbon nanotube film with a sandwich structure was obtained s material.

[0032] In the second step, temperature gradient control is used to realize the infiltration and compounding of the molten lithium metal and the carbon nanotube film. In the glove box (H 2 O≤0.1 ppm; O 2 ≤0.1 ppm), a heating area of ​​100 cm 2 The heater temperature is set at 280 o C, placing the sandwich struct...

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Abstract

A lithium dendrite-free anode with a carbon nanotube film directly compounding molten lithium metal and a preparation method thereof relate to a lithium dendrite-free anode obtained by directly infiltrating a carbon nanotube film with liquid lithium and a preparation method thereof. The heat exchange between the carbon nanotubes and the environment has a temperature gradient in the direction perpendicular to the surface of the material. Adjusting the temperature gradient can make the liquid lithium metal and the upper carbon nanotube film generate negative Gibbs free energy, which in turn drives the liquid lithium metal to infiltrate into the upper carbon nanotube film. The composite material formed by liquid lithium directly and uniformly coated or poured into the carbon nanotube film can be used as an anode for a lithium-free dendrite lithium metal battery with a three-dimensional nanostructure. At ultra-high current density, the lithium-carbon nanotube film composite anode can achieve stable operation without lithium dendrites in symmetrical batteries, and when it is used as an anode in a lithium-sulfur full battery, it can achieve high-rate cycle stability of the battery. The preparation process of the invention is simple and practical, the control is convenient, the large-scale commercial production is easy to be realized, and the lithium dendrite can be effectively suppressed, thereby providing a guarantee for expanding the application field of the lithium metal battery.

Description

technical field [0001] The invention relates to a lithium-free dendrite anode obtained by directly infiltrating a carbon nanotube film with liquid lithium and a preparation method thereof. Specifically, it belongs to a lithium-free dendrite-free composite anode with a three-dimensional nanostructure that can be applied to a lithium metal battery by controlling and controlling a temperature gradient and realizing direct infiltration of molten lithium metal into a carbon nanotube film. This greatly reduces the risk of short circuit caused by lithium dendrites in existing high specific energy lithium metal batteries, which in turn can promote the widespread application of lithium metal batteries. Background technique [0002] Since the commercialization of lithium-ion batteries (LIBs) in 1991, advanced energy storage technologies have made our lives more convenient and energy utilization cleaner. However, due to the low theoretical energy density limitation of intercalation el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/66H01M4/38H01M4/1395H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/134H01M4/1395H01M4/382H01M4/625H01M4/628H01M4/663H01M10/0525H01M2004/027Y02E60/10
Inventor 吴子平王志勇卢忠旭胡英燕尹艳红刘先斌黎业生
Owner JIANGXI UNIV OF SCI & TECH
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