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MXene-coated ternary positive electrode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as complex material preparation procedures, achieve complex preparation procedures, improve electronic conductance and ion conductivity, Effects of Improving Rate Performance and Cycle Performance

Pending Publication Date: 2022-08-09
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above-mentioned technical problems, the present invention provides a MXene-coated ternary positive electrode material and its preparation method and lithium ion battery, optimizes the preparation process of the MXene-coated ternary positive electrode material, and solves the problem of complicated material preparation process, Compared with uncoated ternary cathode materials, the electrochemical properties such as rate performance, high temperature cycle and high temperature storage of ternary cathode materials are significantly improved

Method used

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  • MXene-coated ternary positive electrode material, preparation method thereof and lithium ion battery
  • MXene-coated ternary positive electrode material, preparation method thereof and lithium ion battery
  • MXene-coated ternary positive electrode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0051] This embodiment provides a preparation method of MXene-coated ternary positive electrode material, and the preparation method includes the following steps:

[0052] (1) Mixed Ti 3 AlC 2 and LiF / HCl mixed solution, wherein the mass fraction of HCl is 20wt%, the concentration of LiF is 2.5mol / L, and the reaction is stirred for 2.5h to obtain Ti 3 C 2 ;

[0053] (2) Mixed NCM811 (chemical formula is Ni 0.8 Co 0.1 Mn 0.1 (OH) 2 ) precursor and lithium hydroxide, calcined at 850 °C for 12 h in an oxygen atmosphere to obtain a ternary cathode first-fired product;

[0054] (3) mixed water, step (1) gained Ti 3 C 2 and step (2) obtained ternary cathode first calcined product, the mass ratio of MXene and ternary cathode first calcined product is 1:100, the liquid-solid ratio after mixing is 250mL / g, and the secondary calcination temperature is 500 ℃ for 8h, The MXene-coated ternary cathode material is obtained.

Embodiment 2

[0056] This embodiment provides a preparation method of MXene-coated ternary positive electrode material, and the preparation method includes the following steps:

[0057] (1) Mixed Ta 4 GaC 3 and LiF / HCl mixed solution, wherein the mass fraction of HCl is 25wt%, the concentration of LiF is 5mol / L, and the reaction is stirred for 0.5h to obtain Ta 4 C 3 ;

[0058] (2) Mixing NCM811 precursor and lithium carbonate, and calcining at 900 °C for 15 hours in an air atmosphere to obtain a ternary cathode first-fired product;

[0059] (3) Mix NMP, the Ta obtained in step (1) 4 C 3 and the ternary cathode first calcined product obtained in step (2), the mass ratio of MXene and the ternary cathode first calcined product is 1:5, the liquid-solid ratio after mixing is 100 mL / g, and the secondary calcination at 150 ° C is carried out in an oxygen atmosphere. After calcination for 13h, the MXene-coated ternary cathode material was obtained.

Embodiment 3

[0061] This embodiment provides a preparation method of MXene-coated ternary positive electrode material, and the preparation method includes the following steps:

[0062] (1) Hybrid (V 0.5 Cr 0.5 ) 3 AlC 2 and LiF / HCl mixed solution, wherein, the mass fraction of the HCl is 10wt%, the concentration of LiF is 2mol / L, and the reaction is stirred for 5h to obtain (V 0.5 Cr 0.5 ) 3 C 2 ;

[0063] (2) Mixing the NCM811 precursor and lithium carbonate, and calcining at a temperature of 1100 ° C for 7 hours to obtain a ternary cathode first-fired product;

[0064] (3) mixed water, step (1) gained (V 0.5 Cr 0.5 ) 3 C 2 With the ternary cathode first-fired product obtained in step (2), the mass ratio of MXene and the ternary cathode first-fired product is 1:200, the liquid-solid ratio after mixing is 500mL / g, and the temperature is 850 ℃ in an air atmosphere. Secondary calcination was performed for 2 h to obtain the MXene-coated ternary cathode material.

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Abstract

The invention relates to an MXene coated ternary positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: (1) preparing MXene by an etching method; (2) mixing the ternary precursor and a lithium source, and performing primary calcination to obtain a ternary positive electrode primary calcined product; and (3) mixing a dispersing agent, the MXene obtained in the step (1) and the ternary positive electrode primary burning product obtained in the step (2), and carrying out secondary burning to obtain the MXene coated ternary positive electrode material. According to the preparation method of the MXene-coated ternary positive electrode material provided by the invention, a uniform conductive network coating layer is formed on the surface of the ternary positive electrode material, so that the side reaction of the ternary material and an electrolyte can be effectively inhibited; the preparation process of the MXene coated ternary positive electrode material is optimized, and the problem that the material preparation process is complicated is solved; and the electronic conductivity and the ionic conductivity of the positive electrode material are improved, so that the rate capability and the cycle performance are improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and relates to a preparation method of an MXene-coated ternary positive electrode material, in particular to an MXene-coated ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Ternary cathode materials have attracted much attention due to their outstanding advantages such as high power density, energy density, and excellent cycle performance, and have become one of the most widely used cathode materials for lithium-ion secondary batteries in the industry. The study found that with the continuous increase of nickel content in the ternary cathode material, a high specific capacity can be obtained, but at the same time, defects in the material structure will be generated, and Ni has catalytic activity in a high charge state. 4+ It will aggravate the interfacial side ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525C01B32/90C01G53/00
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/624H01M10/0525C01B32/90C01G53/00C01P2006/40Y02E60/10
Inventor 周永兵谭小芳王超曾汉民何巍
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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