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
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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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