Three-dimensional carbon material, preparation method and application thereof

A carbon material, three-dimensional technology, applied in the field of three-dimensional carbon material and its preparation, can solve the threat of battery safety performance and other issues, achieve the effect of improving cycle life and Coulombic efficiency, reducing risk, and low specific surface area

Active Publication Date: 2022-07-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, they used hollow carbon fibers prepared by carbonizing cotton fibers to stabilize lithium metal and found that lithium could be deposited on the outer or inner surfaces, a result contrary to their previous work due to the many defects on the surface of amorphous carbon tubes Promotes the nucleation of lithium and inhibits the restriction of the tubular structure on lithium deposition, thus causing more lithium to be deposited on the outside of the carbon tube. After multiple charge-discharge cycles, the unrestricted lithium dendrites are safe for the battery performance is at risk

Method used

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  • Three-dimensional carbon material, preparation method and application thereof
  • Three-dimensional carbon material, preparation method and application thereof
  • Three-dimensional carbon material, preparation method and application thereof

Examples

Experimental program
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Embodiment 1 3

[0078] Example 1 Preparation of three-dimensional carbon material

[0079] Preparation of 1# 3D carbon material

[0080] The aluminum silicate fibers were repeatedly washed three times with ethanol and deionized water, dried, and heated to 1150 °C in an inert atmosphere of argon in a tube furnace for calcination at a heating rate of 5 °C / min. The flow rate was 100 sccm, and the deposition time was 20 min. After the cooling, the vapor-deposited samples were taken out, etched with 15wt% HF for 48 hours to remove the aluminum silicate fibers, and then washed with deionized water for three times and dried to obtain the required three-dimensional highly graphitized large-diameter carbon tubes, denoted as 1# 3D carbon material.

[0081] Preparation of 2# 3D Carbon Materials

[0082] The difference from the preparation process of 1# three-dimensional carbon material is that the temperature is raised to 600 ° C for calcination, ethylene gas is introduced, the flow rate of ethylene ...

Embodiment 2 3

[0085] Example 2 Testing of three-dimensional carbon materials

[0086] characterization of topography

[0087] Scanning electron microscope test and transmission electron microscope test were performed on 1#~3# three-dimensional carbon materials respectively. The test results of scanning electron microscope show that the diameter of the carbon tube is 2~30μm; the test result of transmission electron microscope shows that the wall thickness of the tube wall is 10~100nm.

[0088] Taking 1# three-dimensional carbon material as a typical representative, figure 1 is the scanning electron microscope image of 1# 3D carbon material, from figure 1 It can be clearly seen that the three-dimensional carbon material is a tubular structure, and the diameter of the carbon tube is about 10 μm; figure 2 is the TEM image of the tube wall of the 1# three-dimensional carbon material, from figure 2 The thickness of the tube wall can be seen to be 22 nm in the transmission electron microscop...

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Abstract

The present application discloses a three-dimensional carbon material, a preparation method and an application thereof. The three-dimensional carbon material is tubular; the three-dimensional carbon material includes a graphitized pipe wall and a hollow lumen enclosed by the pipe wall. The three-dimensional carbon material enables the selective deposition of lithium metal in the tube, effectively suppresses dendrites generated during the deposition / precipitation of lithium metal, greatly reduces the risk of lithium metal negative electrodes, and improves the cycle life of the battery. and Coulombic efficiency, reducing voltage polarization.

Description

technical field [0001] The present application relates to a three-dimensional carbon material, a preparation method and application thereof, and belongs to the technical field of carbon materials. Background technique [0002] Over the past 20 years, lithium-ion batteries with graphite anodes have achieved great success in powering various devices. However, the energy density of graphite anodes has reached the limit, so it is difficult to meet people's requirements for the increasing specific capacity of batteries. Lithium has a high theoretical specific capacity (3860mA h g -1 , 10 times higher than graphite) and low negative electrochemical potential (-3.040V vs standard hydrogen electrode) and low density (0.53g cm -3 ), so Li metal is an ideal anode material, but there are still serious problems in the practical application of Li metal anode, such as the formation of Li dendrites and huge volume change, which lead to low Coulombic efficiency, easy internal short circui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/05
CPCH01M4/583H01M4/625H01M10/0525C01B32/05Y02E60/10
Inventor 何海勇陈伟林王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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