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One-step method for synthesizing few-layer Nb2C material and application of few-layer Nb2C material

A one-step, two-step technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as cumbersome synthesis methods

Pending Publication Date: 2019-06-21
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve the existing few-layer Nb 2 The C preparation method needs an intercalation agent, and the synthesis method is more cumbersome, and a one-step method for synthesizing few-layer Nb is provided. 2 C material methods and their applications

Method used

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  • One-step method for synthesizing few-layer Nb2C material and application of few-layer Nb2C material
  • One-step method for synthesizing few-layer Nb2C material and application of few-layer Nb2C material
  • One-step method for synthesizing few-layer Nb2C material and application of few-layer Nb2C material

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specific Embodiment approach 1

[0021] Specific implementation mode 1: In this implementation mode, few-layer Nb 2 The preparation method of C material is implemented according to the following steps:

[0022] 1. Add 0.5~1g Nb 2 Put the AlC powder into 30-60 mL of HF aqueous solution with a mass concentration of 30%-50%, and stir in a water bath at 55-65°C for 90-130 hours to obtain a reacted solution;

[0023] 2. Use a centrifuge to repeatedly centrifuge the solution after the reaction in step 1 at 8000-10000r / min. When the pH of the system reaches 5-6, reduce the speed of the centrifuge to 4000-6000r / min and continue to centrifuge. Ultrasonic treatment for 1-2 minutes before each centrifugation to make the solution more evenly dispersed, and the suspension was obtained after several times of centrifugation;

[0024] 3. Filtration of the suspension in step 2 to obtain a few layers of Nb 2 C film material.

[0025] Few-layer Nb prepared in existing 2 In the process of C material, it is generally by etch...

specific Embodiment approach 2

[0026] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 0.5-0.7gNb 2 Put the AlC powder into 30-40mL of HF aqueous solution.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in step one, 0.5g Nb 2 AlC was put into 30 mL of 40% HF aqueous solution.

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Abstract

The invention relates to a one-step method for synthesizing a few-layer Nb2C material and an application of the few-layer Nb2C material and aims to solve the problems that existing few-layer Nb2C preparation methods require an intercalation agent and synthesis methods are relatively complex. The synthesis method comprises the following steps: 1, placing Nb2AlC powder in an HF aqueous solution withmass concentration being 30%-50%, and performing stirring in a water bath at 55-65 DEG C for 90-130 h to obtain a reacted solution; 2, performing centrifugation cleaning on the reacted solution by acentrifuge at 8000-10000 r / min, and when the pH of the system is 5-6, reducing the rotating speed of the centrifuge to 4000-6000 r / min to continue centrifugation cleaning to obtain a suspension; 3, filtering the suspension. Synthesis steps are simplified and no intercalation agent is needed. Few-layer Nb2C shows advantages of high specific surface area, high specific capacity, long cycle life andthe like when serving as anode of a lithium-ion battery.

Description

technical field [0001] The invention relates to a method for preparing few-layer Nb 2 C material approach, and few-layer Nb 2 The application of C material as the negative electrode material of lithium ion battery. Background technique [0002] In 2004, Geim and Novoselov successfully exfoliated a thin sheet composed of only one layer of carbon atoms from graphite by mechanical exfoliation, that is, a two-dimensional graphene structure, which broke the classic theory that "thermodynamic fluctuations do not allow any two-dimensional crystal exist at a finite temperature", opening a new era of two-dimensional materials. Subsequently, scientists prepared more stable graphene by redox method, SiC epitaxy method, chemical vapor deposition (CVD) and other methods, and obtained excellent electrical properties, thermal conductivity, etc., which have been applied to optical devices, chemical sensors, new Energy batteries and many other fields. However, graphene only contains one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/914H01M4/58H01M10/0525
CPCY02E60/10
Inventor 高红赵家宝张喜田郑如东石磊肖钧鹏
Owner HARBIN NORMAL UNIVERSITY
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