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Layered positive electrode material of energy storage secondary battery and preparation method of layered positive electrode material

A secondary battery and positive electrode material technology, applied in the field of electrochemical energy storage, can solve the problems of poor cycle performance and achieve the effects of uniform phase, low efficiency, and high lithium ion diffusion coefficient

Active Publication Date: 2022-05-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]The present invention solves the problem of poor cycle performance of the existing energy storage secondary battery layered positive electrode materials, and provides an effective improvement in structural stability and electrochemical High-performance energy storage secondary battery layered transition metal oxide positive electrode material and preparation method thereof

Method used

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  • Layered positive electrode material of energy storage secondary battery and preparation method of layered positive electrode material
  • Layered positive electrode material of energy storage secondary battery and preparation method of layered positive electrode material
  • Layered positive electrode material of energy storage secondary battery and preparation method of layered positive electrode material

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Effect test

Embodiment 1

[0037]The first step: uniformly disperse nickel chloride, manganese chloride and carbon nanotubes in deionized water according to the molar ratio of 1:2 (the load of transition metal is 50%, that is, the sum of the mass of nickel chloride and manganese chloride The mass of carbon nanotubes is 1:2), heated and stirred at 60°C to evaporate the water in the solution to dryness, and the intermediate is solid powder;

[0038] The second step: the intermediate solid powder obtained in the first step is heated in an argon / hydrogen mixed atmosphere at 300°C for 4 hours to obtain a carbon-supported transition metal alloy, wherein the heating rate is 5°C / min;

[0039] Step 3: Mix and grind the carbon-loaded transition metal alloy precursor obtained in the second step with sodium carbonate (the total molar ratio of sodium element to transition metal element is 2:3) for 20 minutes, and place the ground mixture in an air atmosphere Calcined at 900°C for 14 hours, the heating rate was 5°C / m...

Embodiment 2

[0041] The first step: uniformly disperse nickel chloride, cobalt chloride, manganese chloride and carbon nanotubes in deionized water according to the molar ratio of 1:1:1 (the load of transition metal is 50%, that is, nickel chloride, chlorine The sum of the mass ratio of cobalt chloride and manganese chloride to the mass of carbon nanotubes is 1:2), heated and stirred at 60°C to evaporate the water in the solution to dryness, and the intermediate solid powder;

[0042] The second step: the intermediate solid powder obtained in the first step is heated in an argon / hydrogen mixed atmosphere at 300°C for 4 hours to obtain a carbon-supported transition metal alloy, wherein the heating rate is 5°C / min;

[0043] Step 3: Mix and grind the carbon-loaded transition metal alloy precursor obtained in the second step with sodium carbonate (the total molar ratio of sodium element to transition metal element is 1.05:1) for 20 minutes, and place the ground mixture in an air atmosphere Cal...

Embodiment 3

[0045] The first step: uniformly disperse nickel chloride, cobalt chloride, manganese chloride and carbon nanotubes in deionized water according to the molar ratio of 8:1:1 (the load of transition metal is 50%, that is, nickel chloride , cobalt chloride, and manganese chloride are 1:2 compared to the mass of carbon nanotubes), heated and stirred at 60°C to evaporate the water in the solution to dryness, and the intermediate solid powder;

[0046] The second step: the intermediate solid powder obtained in the first step is heated in an argon / hydrogen mixed atmosphere at 300°C for 4 hours to obtain a carbon-supported transition metal alloy, wherein the heating rate is 5°C / min;

[0047] Step 3: Mix and grind the carbon-loaded transition metal alloy precursor obtained in the second step with lithium hydroxide (the total molar ratio of lithium to transition metal elements is 1.02:1) and grind for 20 minutes, and place the ground mixture in an air atmosphere Calcined at 800°C for 10...

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Abstract

The invention relates to an energy storage secondary battery layered positive electrode material and a preparation method thereof, and belongs to the technical field of electrochemical energy storage. The preparation method comprises the steps that mixed transition metal salt and a carbon carrier are evenly dispersed in a solvent, the mixed transition metal salt contains at least two transition metal elements, a mixed solution is obtained, then heating is conducted, the solvent in the mixed solution is evaporated to dryness, and solid powder is obtained; reducing the solid powder into a transition metal alloy to obtain a carbon-loaded transition metal alloy precursor; and uniformly mixing the precursor with an alkali metal source, and calcining to obtain the layered positive electrode material of the energy storage secondary battery. The lithium ion / sodium ion battery layered positive electrode material obtained by the invention shows relatively high charge-discharge specific capacity and good cycle performance, and the method disclosed by the invention is simple in preparation process, easily available in raw materials, environment-friendly and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and more specifically relates to a layered cathode material for an energy storage secondary battery and a preparation method thereof. Background technique [0002] In recent years, the shortage of fossil energy and environmental pollution have become increasingly serious, and the development of clean and renewable energy is imminent. Lithium-ion batteries have the advantages of high energy density, long service life, stable working voltage, light weight and environmental friendliness, and are widely used in consumer electronics, new energy vehicles and other fields. With the rapid development of smart grids and new energy electric vehicles, the energy density of lithium-ion batteries is increasingly demanding, and the development of lithium-ion battery electrode materials with high specific capacity, low cost and good stability plays an important role in improving the energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525H01M10/054H01M2004/028Y02E60/10
Inventor 王得丽栗志展程锦国秦金磊刘宏芳
Owner HUAZHONG UNIV OF SCI & TECH