Preparation method of cobaltosic oxide with high-magnification-performance micro-nano structure

A micro-nano structure, cobalt tetroxide technology, applied in cobalt oxide/cobalt hydroxide, structural parts, electrochemical generators, etc., can solve the problems of restricting industrial application, low capacity retention, poor rate performance, etc. Active point, shorten the diffusion distance, and facilitate the effect of wetting

Active Publication Date: 2014-06-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing cobalt tetroxide has disadvantages such as low capacity retention rate, poor rate performance, and poor conductivity; and most of the synthesis methods are solvothermal methods, which have low yield and high cost, which seriously restricts its industrial application.

Method used

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  • Preparation method of cobaltosic oxide with high-magnification-performance micro-nano structure
  • Preparation method of cobaltosic oxide with high-magnification-performance micro-nano structure
  • Preparation method of cobaltosic oxide with high-magnification-performance micro-nano structure

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Experimental program
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Effect test

Embodiment 1

[0030] Weigh 2.50g of cobalt acetate tetrahydrate, 3.0g of urea and 3.0g of triethanolamine, dissolve the above substances in deionized water at room temperature, and form a red transparent solution of 100ml at constant volume; Put the reaction kettle into a homogeneous reactor, set the reaction temperature to 160°C, and the reaction time to 12 hours. After the reaction was completed and the reactor was cooled to room temperature, the solid-liquid mixture in the reactor was transferred to a beaker. After repeated washing and centrifugation, the solid was dried in a vacuum oven at 60 °C for 12 hours to obtain a pure pink cobalt carbonate precursor. Put the cobalt carbonate into a crucible, then place it in a muffle furnace, set the reaction temperature to 600°C, and the reaction time to 10 hours. After calcining, a black tricobalt tetroxide powder material is obtained, and its weight is weighed to be about 1.05g. The average particle size measured by a particle size analyzer i...

Embodiment 2

[0032]Weigh 2.91g of cobalt nitrate hexahydrate, 3.0g of urea and 3.0g of triethanolamine, dissolve the above substances in deionized water at room temperature, and form a red transparent solution of 100ml at constant volume; Put the reaction kettle into a homogeneous reactor, set the reaction temperature to 160°C, and the reaction time to 12 hours. After the reaction was completed and the reactor was cooled to room temperature, the solid-liquid mixture in the reactor was transferred to a beaker. After repeated washing and centrifugation, the solid was dried in a vacuum oven at 60 °C for 12 hours to obtain a pure pink cobalt carbonate precursor. Put the cobalt carbonate into a crucible, then place it in a muffle furnace, set the reaction temperature to 600°C, and the reaction time to 10 hours. After calcining, a black tricobalt tetroxide powder material is obtained, and its weight is weighed to be about 1.00g. The average particle size measured by a particle size analyzer is ...

Embodiment 3

[0034] Weigh 2.40g of cobalt chloride hexahydrate, 3.0g of urea and 3.0g of triethanolamine, dissolve the above-mentioned substances in deionized water at room temperature, and form a red transparent solution of 100ml at constant volume; In a stainless steel reaction kettle made of tetrafluoroethylene, put the reaction kettle into a homogeneous reactor, set the reaction temperature to 140° C., and the reaction time to 12 hours. After the reaction was completed and the reactor was cooled to room temperature, the solid-liquid mixture in the reactor was transferred to a beaker. After repeated washing and centrifugation, the solid was dried in a vacuum oven at 60 °C for 12 hours to obtain a pure pink cobalt carbonate precursor. Put the cobalt carbonate into a crucible, then place it in a muffle furnace, set the reaction temperature to 550°C, and the reaction time to 10 hours. After calcining, black tricobalt tetroxide powder material is obtained, and its weight is weighed to be ab...

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Abstract

The invention discloses a preparation method of a cobaltosic oxide with a high-magnification-performance micro-nano structure. The micro-nano structural cobaltosic oxide is a porous cubic particle which is free from agglomeration and good in dispersing performance, wherein the average diameter of each particle is between 2 micrometers and 10 micrometers and is adjustable, each cubic particle is formed by piling up nano pieces of different sizes and irregular shapes with each other; the thickness and the width of the particle are about 20nm-40nm and 50nm-200nm. The preparation method comprises the following steps: synthesizing a cobalt carbonate precursor by adopting a hydrothermal method and taking cobalt oxide as a metal source, urea as a precipitant, triethanolamine as a dispersant and water as a solvent; performing calcination and pyrolysis to obtain the cobaltosic oxide. The synthesized cobaltosic oxide is excellent in electrochemical performance and especially good in magnification performance and capacity retention ratio; after cycling for 50 times with 1C magnification ratio, the capacity retention ratio is still about 70%, therefore the cobaltosic oxide is an ideal cathode material for a power lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode material development, and more specifically relates to a preparation method of cobalt trioxide with special micro-nano structure. Background technique [0002] At present, power lithium-ion batteries are the bottleneck restricting the development of new energy vehicles. It is imminent to develop new lithium-ion batteries with high power, high specific capacity, good stability, long service life and strong environmental adaptability. However, the negative electrode materials currently used in industry, such as graphite, soft carbon, and hard carbon, have low specific capacities (theoretical specific capacity of graphite is only 372mAh g -1 ), the lithium ion diffusion coefficient is small, it is not easy to charge and discharge quickly, and the ability to withstand overcharge and overdischarge is poor, it is difficult to meet the requirements, and it is urgent to develop new li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52C01G51/04
CPCC01G51/04H01M4/52H01M4/525H01M10/0525Y02E60/10
Inventor 黄国勇徐盛明李林艳王学军
Owner TSINGHUA UNIV
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