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Preparation method of pre-lithiated MXenes material and application of pre-lithiated MXenes material in battery electrode material

A pre-lithiation and magnesium battery technology, applied in the field of new energy storage, can solve the problems affecting the first coulombic efficiency and storage capacity of electrode materials, achieve the effect of improving the rate and cycle performance, simple process method, and making up for losses

Inactive Publication Date: 2021-06-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem of MXene stacking and agglomeration in the cycle process of the existing lithium ion battery, thereby affecting the first Coulombic efficiency and storage capacity of the electrode material

Method used

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  • Preparation method of pre-lithiated MXenes material and application of pre-lithiated MXenes material in battery electrode material
  • Preparation method of pre-lithiated MXenes material and application of pre-lithiated MXenes material in battery electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Prelithiated MXeneV 2 The preparation of C comprises the steps:

[0032] (1) The particle size is 500 mesh 1gV 2 The AlC powder is immersed in 20mL of a mixed solution of hydrochloric acid and sodium fluoride with a concentration of 6mol / L, stirred at 90°C for 72h, cooled to room temperature, then poured into a centrifuge tube, and centrifuged several times with deionized water until the The solution in the tube was neutral, and the upper layer solution was precipitated. The sample left at the bottom of the centrifuge tube was dried in a vacuum oven at 80°C for 12 hours to obtain the two-dimensional crystal compound MXeneV 2 C;

[0033] (2) Pre-lithiated MXeneV 2 Preparation of sheet C: glass sheet, lithium foil, two-dimensional crystal compound MXeneV 2 C. Steel sheets and glass sheets are placed in order from top to bottom; after placement, electrolyte LiPF is dripped from the side 6 , exert a certain pressure on the uppermost glass bottle, so that the lithium fo...

Embodiment 2

[0036] Prelithiated MXeneTi 3 C 2 The preparation comprises the following steps:

[0037] (1) 1gTi with a particle size of 500 mesh 3 AlC 2 The powder is immersed in 20mL of a mixed solution of hydrochloric acid and sodium fluoride with a concentration of 6mol / L, stirred at 60°C for 24h, cooled to room temperature, then poured into a centrifuge tube, and centrifuged several times with deionized water until the centrifuge tube The solution in the solution was neutral, and the upper layer solution was precipitated. The sample left at the bottom of the centrifuge tube was placed in a vacuum drying oven at 80°C for 12 hours to obtain a two-dimensional crystal compound MXeneTi 3 C 2 ;

[0038] (2) Pre-lithiated MXeneTi 3 C 2 Preparation of sheet: glass sheet, lithium foil, two-dimensional crystal compound MXeneTi 3 C 2 , steel sheet, and glass sheet are placed in order from top to bottom; after placement, the electrolyte LiPF is dripped from the side 6 , exert a certain p...

Embodiment 3

[0040] A kind of preparation of lithium ion battery: according to mass ratio be 8:1:1, take the pre-lithiated MXeneV prepared in embodiment 1 respectively 2 C. Mix acetylene black and binder, add N-methylpyrrolidone as a solvent, grind it into a slurry, and evenly coat 1mg / cm 2 Afterwards, vacuum drying at 80 °C for 12 h yielded pre-lithiated MXeneV 2 C electrode sheet; with lithium foil as negative electrode, LiPF 6 As the electrolyte, it was assembled into a button lithium electronic battery in a glove box.

[0041] The lithium-ion battery assembled in this embodiment was tested at a current density of 50mA / g, and the cycle performance when the voltage range was 0.01-3.0V; the test results showed that the V 2 C, as an electrode material for ion batteries, its initial charge and discharge capacity is 656mAh / g, and its coulombic efficiency is 75%; compared to MXeneV without pre-lithiation treatment 2 C's first charge and discharge capacity, Coulombic efficiency and lithium ...

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Abstract

The invention discloses a preparation method of a pre-lithiated MXene material. The preparation method comprises the following steps: etching MAX phase ceramic powder by using a mixed solution of sodium fluoride and hydrochloric acid to obtain two-dimensional carbide MXenes; and preparing the pre-lithiated MXenes by adopting a simple self-discharge principle, so that the preparation method is simple, safe and low in cost; and moreover, enlarging the interlayer spacing of MXenes through the entrance of Li+, exposing more surface active sites, increasing ion transmission channels, and meanwhile, solving the problem of stacking and agglomeration of MXenes lamellas in the circulation process. The pre-lithiated MXenes are used as the electrode material of the lithium ion battery, so that the loss of lithium ions in the first charging process can be made up, the coulombic efficiency of first charging and discharging is improved, and the storage capacity of the MXenes to the lithium ions is improved to a greater extent. The pre-lithiated MXenes as the magnesium ion battery electrode material realizes magnesium-lithium co-intercalation, improves the rate and cycle performance, and is an excellent electrode material.

Description

technical field [0001] The invention relates to the field of new energy storage, in particular to a preparation method of a pre-lithiated MXenes material and its application in battery electrode materials. Background technique [0002] MXene is a novel two-dimensional layered transition metal carbide or carbonitride nanomaterial with a graphene-like structure. Generally, it is obtained by etching away the A element in the MAX phase of the precursor by using HF solution or a mixed solution of fluorine salt and acid. Where M is a transition metal element, A represents IIIA / IVA elements, and X is carbon or nitrogen. At present, the MXene synthesized in the laboratory mainly includes Ti 3 C 2 、Ti 2 C.Mo 2 C, (Ti 0.5 Nb 0.5 ) 2 C.Ti 3 CN, Sc 2 C. Ta 4 C 3 , Nb 2 C, V 2 C and Nb 4 C 3 . Due to the diversity of MXene species and its excellent conductivity, hydrophilicity and chemical stability, it has attracted many scholars' research in recent years, making MXene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054H01M10/058B82Y40/00
CPCB82Y40/00H01M4/362H01M4/58H01M4/62H01M10/0525H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 张贺李丽高仁美赵爱侠
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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