Three-dimensional carbon material and preparation method thereof, lithium metal composite electrode and preparation method thereof

A composite electrode and metal lithium technology, applied in the field of nanomaterials, can solve problems such as easy to pierce the diaphragm, produce safety hazards, and short-circuit the battery

Active Publication Date: 2020-10-27
UNIV OF SCI & TECH OF CHINA
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the negative electrode material of lithium batteries, lithium metal has always had the problem of lithium dendrites: during the growth process of lithium dendrites, it is easy to pierce the separator, resulting in a short circuit of the battery and a potential safety hazard; at the same time, lithium dendrites are separating and depositing lithium. In the process of continuous generation and fragmentation, some free lithium (dead lithium) on the surface of lithium metal is produced, and the surface of lithium metal needs to continuously regenerate the solid electrolyte interface film (SEI), so that the cycle stability and coulombic efficiency of lithium metal batteries greatly affected
[0006] At present, there are many studies devoted to the application of three-dimensional carbon materials to lithium metal negative electrodes, but they all focus on circulation under low current density and small surface capacity. mA / cm 2 Kneading capacity 0.625mA·h / cm 2 Under circulation, some people also try to circulate under high current density and small surface capacity. For example, the Chinese patent with the publication number CN106784635 discloses a three-dimensional carbon material. 2 Kneading capacity 1mA·h / cm 2 Under cycle, but rarely achieve high current density and high areal capacity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-dimensional carbon material and preparation method thereof, lithium metal composite electrode and preparation method thereof
  • Three-dimensional carbon material and preparation method thereof, lithium metal composite electrode and preparation method thereof
  • Three-dimensional carbon material and preparation method thereof, lithium metal composite electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The present invention also provides a method for preparing the above-mentioned three-dimensional carbon material, comprising: S1) immersing the sponge in an aqueous solution of a soluble catalyst precursor, and drying to obtain a soaked sponge; the soluble catalyst is a salt of an iron series element Compound; S2) The soaked sponge is heated and kept warm in a protective atmosphere to obtain a three-dimensional carbon material.

[0037] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0038] The sponge is a sponge well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably polyether sponge, polyvinyl alcohol sponge, melamine sponge, polyurethane sponge, cotton fiber sponge, bamboo fiber sponge and wood fiber sponge. One or more types of plain sponges, when melamine sponges and polyurethane sponges are used, the obtained three-...

Embodiment 1

[0050] 1) Dissolve 0.15g nickel nitrate in 200ml ultrapure water.

[0051] 2) Dissolve 1 g of urea in the above solution.

[0052] 3) The melamine sponge is completely immersed in the above solution, fully absorbed for 12 hours, and then dried at 60° C. to obtain the soaked sponge.

[0053] 4) Put the sponge into a quartz boat, under the protection of argon, raise the temperature from room temperature to 800°C at a rate of 1°C per minute, and keep it warm for 2 hours to obtain a three-dimensional carbon material.

[0054] The melamine sponge is directly carbonized in argon according to step 4) to obtain the carbonized melamine sponge. Utilize scanning electron microscope to analyze the melamine sponge after carbonization, obtain its scanning electron microscope picture, as figure 1 shown.

[0055] Utilize scanning electron microscope to analyze the three-dimensional carbon material obtained in embodiment 1, obtain its scanning electron microscope picture, as figure 2 show...

Embodiment 2

[0059] 1) Dissolve 0.15g nickel nitrate in 200ml ultrapure water.

[0060] 2) Dissolve 0.5g urea in the above solution.

[0061] 3) The melamine sponge is completely immersed in the above solution, fully absorbed for 12 hours, and then dried at 60° C. to obtain the soaked sponge.

[0062] 4) Put the sponge into a quartz boat, under the protection of argon, raise the temperature from room temperature to 800°C at a rate of 1°C per minute, and keep it warm for 2 hours to obtain a three-dimensional carbon material.

[0063] Utilize scanning electron microscope to analyze the three-dimensional carbon material obtained in embodiment 2, obtain its scanning electron microscope picture, as Figure 5 shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing a three-dimensional carbon material. The method comprising: S1) soaking a sponge in a soluble catalyst precursor aqueous solution, after drying, obtaining a soaked sponge; the soluble catalyst being a salt compound of iron series element; S2) heating the soaked sponge in a protective atmosphere and keeping the temperature, and obtaining the three-dimensional carbon material. Compared with the prior art, according to the invention, the sponge is used as a solid carbon source, the sponge adsorbs catalyst precursor in an early stage, and then in theprotective atmosphere, the sponge is pyrolyzed and carbonized, the catalyst is generated in situ, and the carbon nanotube grows at the same time; the three-dimensional carbon material with the carbonnanotube winding a carbonized sponge framework is prepared, the method is simple without requiring post processing; moreover, the three-dimensional carbon material maintains the elasticity and the three-dimensional framework structure of the sponge, has certain conductivity, also has a larger specific surface area and rich void structures, and after depositing metal lithium, and the three-dimensional carbon material maintains the elasticity and the three-dimensional framework structure of the sponge can achieve high current density and high surface capacity without dendrite formation.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a three-dimensional carbon material and a preparation method thereof, a metal lithium composite electrode and a preparation method thereof. Background technique [0002] Carbon nanotubes are one-dimensional carbon nanomaterials with a unique tubular structure. Compared with traditional carbon materials, carbon nanotubes have excellent mechanical and electrical properties, and have broad application prospects in energy storage. [0003] Many scholars have studied the preparation of carbon nanotubes from solid carbon sources. For example, the Chinese patent with the publication number CN107032326A discloses a method for preparing helical carbon nanotubes using solid-phase catalysis. The method uses urea or melamine powder as a solid state. Carbon source, prepared carbon nanotubes under the atmosphere of protective gas, but the material obtained by this meth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/36H01M4/38H01M4/587H01M10/052B82Y30/00
CPCB82Y30/00C01B32/05H01M4/366H01M4/382H01M4/587H01M10/052Y02E60/10
Inventor 朱彦武谢兼
Owner UNIV OF SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products