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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle stability is still poor and

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
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Example Embodiment

[0030] Example 1

[0031] In this embodiment, the solvothermal method is used to prepare nitrogen-doped MXene material, and the specific steps are:

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

[0033] Among them, the MAX phase is 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: using the MXene prepared in step 1) as the raw material, urea as the nitrogen source, adding the substance to the deionized water at a ratio of 0.2 to 0.6, and addin...

Example Embodiment

[0035] Example 2

[0036] In this embodiment, N 2 Preparation of nitrogen-doped Mxene material by heat treatment, the specific steps are:

[0037] 1) Preparation of MXene material: same as step 1) of Example 1, wherein the MAX phase is the chemical formula M n+1 AX n Ternary layered compound, where MAX phase is 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, between 600~1200 o C heat treatment for 2-8h to obtain nitrogen-doped MXene material.

Example Embodiment

[0039] Example 3

[0040] NH is used in this embodiment 3 Preparation of nitrogen-doped Mxene material by heat treatment, the specific steps are:

[0041] 1) Preparation of MXene material: same as step 1) of Example 1, wherein the MAX phase is 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: Place the MXene powder prepared in step 1) in a tube furnace, and pass NH at a flow rate of 1:1 3 / Ar and H 2 / Ar mixture, between 400~1000 o C heat treatment for 1~6h to obtain nitrogen-doped MXene.

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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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