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Preparation method and application of nitrogen-doped MXene battery anode material

A battery negative electrode, nitrogen doping technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems that cannot meet the needs of practical applications, poor cycle stability, etc., achieve low ion diffusion resistance, specific capacity increase, good The effect of conductivity

Active Publication Date: 2016-10-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle stability is still poor and cannot meet the needs of practical applications

Method used

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  • Preparation method and application of nitrogen-doped MXene battery anode material
  • Preparation method and application of nitrogen-doped MXene battery anode material
  • Preparation method and application of nitrogen-doped MXene battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, a nitrogen-doped MXene material is prepared by a solvothermal method, and the specific steps are:

[0032] 1) Preparation of MXene material: Add the MAX phase to the hydrofluoric acid solution at a ratio of 0.02~0.2g / ml, stir at room temperature for a certain period of time, and remove the A atomic layer; remove the lower layer of solid, wash with deionized water and centrifuge , to PH value of 5~7; at 60~120 o C Vacuum drying for 8~48h; put the dried powder in a heat treatment furnace, pass H 2 / Ar mixed gas, at 400~800 o C heat treatment 1~4h; Make described MXene material.

[0033] Among them, the MAX phases are respectively Ti 3 AlC 2 , Ti 2 AlC,V 2 AlC or Nb 2 AlC; the prepared MXene materials correspond to Ti 3 C 2 , Ti 2 C, V 2 C or Nb 2 c.

[0034] 2) Nitrogen doping: use the MXene prepared in step 1) as the raw material, urea as the nitrogen source, add the deionized water at a material ratio of 0.2~0.6, and add 5~40mmol / L acetone ...

Embodiment 2

[0036] In this example, N 2 The nitrogen-doped Mxene material is prepared by heat treatment, and the specific steps are:

[0037] 1) Preparation of MXene material: the same as step 1) of Example 1, wherein the MAX phase has the chemical formula M n+1 AX n A ternary layered compound of which the MAX phases are respectively Ti 3 AlC 2 , Ti 2 AlC,V 2 AlC or Nb 2 AlC; the prepared MXene materials correspond to Ti 3 C 2 , Ti 2 C, V 2 C or Nb 2 c.

[0038] 2) Nitrogen doping: put the MXene powder prepared in step 1) in a tube furnace, and pass H 2 / N 2 Mixed gas, at 600~1200 o C heat treatment for 2~8h to prepare nitrogen-doped MXene materials.

Embodiment 3

[0040] In this example, NH 3 The nitrogen-doped Mxene material is prepared by heat treatment, and the specific steps are:

[0041] 1) Preparation of MXene material: the same as step 1) of Example 1, where the MAX phases are respectively Ti 3 AlC 2 , Ti 2 AlC,V 2 AlC or Nb 2 AlC; the prepared MXene materials correspond to Ti 3 C 2 , Ti 2 C, V 2 C or Nb 2 c.

[0042] 2) Nitrogen doping: put the MXene powder prepared in step 1) in a tube furnace, and feed NH at a flow rate of 1:1 3 / Ar and H 2 / Ar mixed gas, at 400~1000 o C heat treatment for 1~6h to prepare nitrogen-doped MXene.

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PUM

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Abstract

The invention discloses a preparation method of a nitrogen-doped MXene battery anode material and application thereof in a lithium ion battery and a sodium ion battery. The preparation method of the nitrogen-doped MXene battery anode material comprises two steps of preparation of an MXene material and nitrogen doping on the MXene material, wherein the invention discloses a solvothermal method, a thermal treatment method, a plasma treatment method and a microwave irradiation gas phase method which are used for carrying out the nitrogen doping on the MXene material. According to the preparation method of the nitrogen-doped MXene battery anode material, disclosed by the invention, the nitrogen-doped MXene battery anode material prepared through multiple methods has good conductivity, good cyclic stability, good rate capability and higher specific surface area, and is suitable for large-scale development and application of the lithium ion battery or the sodium ion battery.

Description

technical field [0001] The invention belongs to the field of battery technology, in particular to a preparation method and application of an MXene battery negative electrode material. Background technique [0002] With the rapid development of modern society and the depletion of traditional energy sources, it is more urgent to find new clean energy sources. Due to its unique advantages such as high energy density, power density, high working voltage, low self-discharge rate, no memory effect, long cycle life, and no pollution, lithium-ion batteries have rapidly developed into one of the most important and advanced secondary batteries. [0003] At present, most of the commercial lithium-ion battery anode materials use graphitized carbon materials that are cheap, thermally stable, and environmentally friendly. However, due to the relatively low lithium intercalation potential of graphite, it is easy to cause the decomposition of the electrolyte and the precipitation of dendrit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/054C01B31/30
CPCH01M4/364H01M4/587H01M4/624H01M10/054Y02E60/10
Inventor 姜银珠郝梦倩
Owner ZHEJIANG UNIV
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