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Preparation method of tricobalt tetraoxide-ferric oxide composite oxide

A technology of ferric oxide and composite oxides, applied in the direction of cobalt oxide/cobalt hydroxide, iron oxide/iron hydroxide, iron oxide, etc., which can solve the problem of low theoretical specific capacity and density, large loss of irreversible capacity, and unsatisfactory The high energy density and portability requirements of lithium-ion batteries and other issues, to achieve the effect of excellent cycle performance

Inactive Publication Date: 2018-08-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortcomings of low theoretical specific capacity and density, graphite electrode materials can no longer meet people's requirements for high energy density and portability of lithium-ion batteries. The development of new materials with excellent electrochemical properties is an urgent problem to be solved for current lithium-ion batteries.
Transition metal oxides are a typical type of conversion-type negative electrode, but transition metal oxides (such as cobalt tetroxide, ferric oxide, etc.) have the disadvantages of large irreversible capacity loss for the first time, poor cycle life, and poor rate performance. In recent years, metal Organic frameworks (MOFs) have been used as unique precursors to obtain nanomaterials with uniform structures by calcination

Method used

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  • Preparation method of tricobalt tetraoxide-ferric oxide composite oxide
  • Preparation method of tricobalt tetraoxide-ferric oxide composite oxide
  • Preparation method of tricobalt tetraoxide-ferric oxide composite oxide

Examples

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Effect test

Embodiment 1

[0023] A preparation method of tricobalt tetroxide-ferric oxide composite oxide, comprising the steps of:

[0024] S1. Co-dissolve cobalt dichloride, ferric nitrate, 1,3,5-benzenetricarboxylic acid, and hydrofluoric acid in water, stir, put them into a polytetrafluoroethylene lining, then put them into a reaction kettle, and heat up. Insulation, obtain cobalt / iron coordination polymer;

[0025] S2. Calcining the cobalt / iron coordination polymer and cooling to obtain tricobalt tetroxide-ferric oxide composite oxide.

Embodiment 2

[0027] A preparation method of tricobalt tetroxide-ferric oxide composite oxide, comprising the steps of:

[0028] S1. Co-dissolve cobalt dichloride, ferric nitrate, 1,3,5-benzenetricarboxylic acid, and hydrofluoric acid in water, put in a magnetic stirrer, stir at room temperature, take out the stirrer, and put it into a polytetrafluoroethylene Lining, then put into the reactor, heat up, heat preservation, obtain cobalt / iron coordination polymer;

[0029] S2, calcining the cobalt / iron coordination polymer in a tube furnace, and obtaining tricobalt tetroxide-ferric oxide composite oxide after natural cooling;

[0030] Wherein, in S1, the stirring time is 0.5h;

[0031] In S1, the heat preservation temperature is 170°C;

[0032] In S1, the holding time is 72h.

Embodiment 3

[0034] A preparation method of tricobalt tetroxide-ferric oxide composite oxide, comprising the steps of:

[0035] S1. Co-dissolve cobalt dichloride, ferric nitrate, 1,3,5-benzenetricarboxylic acid, and hydrofluoric acid in water, put in a magnetic stirrer, stir at room temperature, take out the stirrer, and put it into a polytetrafluoroethylene Lining, then put into the reactor, heat up, heat preservation, obtain cobalt / iron coordination polymer;

[0036] S2, calcining the cobalt / iron coordination polymer in a tube furnace, and obtaining tricobalt tetroxide-ferric oxide composite oxide after natural cooling;

[0037] Wherein, in S1, the stirring time is 3h;

[0038] In S1, the heat preservation temperature is 160°C;

[0039] In S1, the holding time is 80h;

[0040] In S2, calcining is carried out in the atmosphere of air;

[0041] In S2, during the calcination process, the heating rate is 1°C / min;

[0042] In S2, the calcination temperature is 600°C;

[0043] In S2, the...

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Abstract

The invention discloses a preparation method of a tricobalt tetraoxide-ferric oxide composite oxide. The method comprises the following steps of (S1) dissolving cobalt dichloride, ferric nitrate, 1,3,5-benzene tricarboxylic acid and hydrofluoric acid into water and carrying out stirring, heating and heat preservation to obtain a cobalt / iron coordination polymer; and (S2) burning the cobalt / iron coordination polymer, cooling and then obtaining the tricobalt tetraoxide-ferric oxide composite oxide. According to the preparation method, the cobalt / iron coordination polymer is firstly synthesized by adopting a simple and effective hydrothermal method and then pyrolyzed, so that the obtained tricobalt tetraoxide-ferric oxide composite oxide is small in particle and uniform in size and has excellent cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of tricobalt tetroxide-ferric oxide composite oxide. Background technique [0002] In contemporary society, problems such as energy crisis and global warming are becoming more and more serious, and the development of clean and renewable new energy has become particularly important and critical. Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-chromium batteries, lithium-ion secondary batteries have advantages such as high operating voltage and high specific energy, so they have been widely used. [0003] Metal-organic frameworks have many advantages, such as tunable porosity, structure, and function, and have been applied to many new fields, such as new chemical separations, sensors, catalytic reactions, and energy storage, etc. Due to the shortcomings of low theoretical specific capacity and density, graphite elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/525H01M10/0525C01G51/04C01G49/06
CPCC01G49/06C01G51/04H01M4/48H01M4/525H01M10/0525Y02E60/10
Inventor 江大光
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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