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A lithium ion layered ternary cathode material modified by TiN and conductive polymer and a preparation method thereof

A technology of conductive polymers and cathode materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of limited rate performance of materials, achieve high rate performance, improve cycle stability, and improve the effect of rate performance

Active Publication Date: 2019-01-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The simple coating layer greatly improves the cycle stability of the material, but the improvement of the rate performance of the material is limited.

Method used

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  • A lithium ion layered ternary cathode material modified by TiN and conductive polymer and a preparation method thereof
  • A lithium ion layered ternary cathode material modified by TiN and conductive polymer and a preparation method thereof
  • A lithium ion layered ternary cathode material modified by TiN and conductive polymer and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of TiN and Ppy composite-coated LiNi by liquid phase adsorption and chemical oxidation polymerization 0.8 co 0.1 mn 0.1 o 2 Positive electrode material, the steps are as follows:

[0037] 0.04 g of commercially available TiN (~20 nm) nanopowder and 4 g of LiNi 0.8 co 0.1 mn 0.1 o 2Dissolve the positive electrode material in absolute ethanol, ultrasonicate the above mixed solution for 15 minutes and then continue to stir for 2 hours; then add dropwise 1.5% pyrrole monomer doped with sodium p-toluenesulfonate, methylbenzene The doping amount of sodium sulfonate is 1 / 10 of the pyrrole monomer, and then continue to stir and react for 2 hours; transfer the above solution to an environment of 0-4°C and continue to stir, and then slowly add the pre-configured FeCl 3 solution, the oxidative polymerization process lasts for 10 to 12 hours. After the reaction was completed, the obtained solid powder was sufficiently centrifuged and washed, and the obtained ...

Embodiment 2

[0047] 1. Preparation of TiN and PEDOT composite coated LiNi by liquid phase adsorption and chemical oxidation polymerization 0.8 co 0.15 al 0.05 o 2 Cathode material.

[0048] At 0 °C, 0.04 g of commercially available TiN (~20 nm) nanopowders and 4 g of LiNi 0.8 co 0.15 al 0.05 o 2 The positive electrode material was dissolved in chloroform solution, and at the same time, the O in the solution was excluded by Ar 2 , the above mixed solution was ultrasonicated for 15 minutes and then continuously stirred for 30 minutes; then 2% 3,4-ethylenedioxythiophene (EDOT) was added dropwise to the above solution and continuously stirred for 30 minutes; then, the prepared FeCl 3 The solution was added dropwise to the above mixed solution, and Ar was continuously introduced, and the reaction was continued at 0°C for 1 hour, and then reacted at 30°C for 10 hours; the reaction solution obtained was centrifuged, and then, the obtained solid was fully washed with ethanol and deionized w...

Embodiment 3

[0053] 1. Preparation of TiN and PAN-PEG composite-coated LiNi by liquid phase adsorption and chemical oxidation polymerization 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0054] At 0 °C, 0.04 g of commercially available TiN (~20 nm) nanopowders and 4 g of LiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode material was dissolved in chloroform solution, and at the same time, the O in the solution was excluded by Ar 2 , the above mixed solution was ultrasonicated for 15 minutes and then continuously stirred for 30 minutes; then, 2% aniline (An) and ethylene glycol (PEG) monomers (molar ratio 1:1) were added dropwise to the above solution and continuously stirred for 30 minutes; then, The configured ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) solution was added dropwise to the above mixed solution, and N 2 Oxygen in the solution was excluded, and the reaction was continued at 0°C for 12 hours; the resulting reaction solution was centrifuged, and then the obtained solid was ...

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Abstract

The invention discloses a lithium ion layered ternary cathode material modified by TiN and a conductive polymer and a preparation method thereof. Firstly, nanometer TiN and the ternary cathode material are mixed in a liquid phase to form a ternary cathode material with TiN particles uniformly adsorbed; Then a layer of conductive polymer was polymerized on the surface of the material by liquid-phase oxidative polymerization to form a composite coating of nano-TiN particles and conductive polymer. The ternary cathode material coated with TiN and conductive polymer was obtained. As that ternary cathode material of the nickel-based lithium ion battery is coated with TiN and a conductive polymer, On the basis of effectively improving the cycling stability of the material, the magnification performance of the material is greatly improved, especially the high magnification performance, which provides a feasible improvement method for simultaneously improving the cycling stability and the highmagnification performance of the nickel-based cathode material, and has a great application prospect.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to the surface modification of ternary layered cathode materials, more specifically, to a lithium-ion layered ternary cathode material compounded with TiN and conductive polymer and its preparation method. Background technique [0002] As human society pays more and more attention to environmental and energy issues, the development and utilization of alternative new pollution-free and recyclable energy systems has gained the consensus of all mankind. In the current new energy system, lithium-ion batteries have been widely used in many fields due to their unique advantages. In the development process of the past few decades, people have developed transition metal oxides that can intercalate and extract lithium as positive electrode materials for lithium-ion batteries, including: layered LiMO 2 (M=Co, Ni, Mn) and LiM with spinel structure 2 o 4 (M=C...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 施志聪樊青录杨少钿刘军刘丽英
Owner GUANGDONG UNIV OF TECH
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