Preparation method of aluminum iron-doped lithium titanate negative electrode material

A negative electrode material, lithium titanate technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor electrochemical performance, affecting battery cycle life, low conductivity, etc., to achieve high specific capacity, cycle Excellent performance and rate performance, effect of widening the diffusion channel

Inactive Publication Date: 2018-03-13
SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 4 Ti 5 o 12 The low electronic conductivity of the material leads to poor electrochemical performance at high rates, and the problem of flatulence during battery charge and discharge, which seriously affects the cycle life of the battery and limits the practical application of lithium titanate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The molecular formula of the aluminum-iron-doped lithium titanate is Li 3.05 Ti 4 Al 0.95 FeO 12 .

[0024] Dissolve tetrabutyl titanate in ethylene glycol solution to form a titanium solution; add lithium citrate, aluminum chloride, and ferric nitrate to deionized water to prepare a mixed solution; add the mixed solution to the titanium solution under stirring , fully mixed uniformly to obtain a composite solution; the molar mass ratio of the titanium, lithium, aluminum, and iron elements is 4:3.05:0.95:1.

[0025] Transfer the composite solution to a reaction kettle, heat at 180°C for 25 hours, and obtain the precursor after suction filtration and drying; calcinate the precursor at 600°C for 8 hours in an air atmosphere to obtain aluminum-iron-doped titanium Lithium Oxide.

[0026] Weigh the starch and dissolve it in absolute ethanol, stir for 5 hours to form a uniform solution, then add the above-mentioned aluminum-iron-doped lithium titanate and a cross-linking...

Embodiment 2

[0029] The molecular formula of the aluminum-iron-doped lithium titanate is Li 2.95 Ti 4 Al 1.05 FeO 12 .

[0030] Dissolve tetrabutyl titanate in ethylene glycol solution to form a titanium solution; add lithium citrate, aluminum chloride, and ferric nitrate to deionized water to prepare a mixed solution; add the mixed solution to the titanium solution under stirring , fully mixed uniformly to obtain a composite solution; the molar mass ratio of the titanium, lithium, aluminum, and iron elements is 4:2.95:1.05:1.

[0031] Transfer the composite solution to a reaction kettle, heat at 195°C for 30h, and obtain the precursor after suction filtration and drying; calcinate the precursor at 800°C for 10h in an air atmosphere to obtain AlFe-doped titanium Lithium Oxide.

[0032] Weigh the starch and dissolve it in absolute ethanol, stir for 6 hours to form a homogeneous solution, then add the above-mentioned aluminum-iron-doped lithium titanate and a cross-linking agent to the ...

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Abstract

The invention discloses a preparation method of an aluminum iron-doped lithium titanate negative electrode material. According to the method, Al<3+> and Fe<3+> are doped into a lattice structure of lithium titanate according to a certain proportion through a hydrothermal method; the novel negative electrode material synthesized by the method is still of a spinel structure, so that the lithium iondiffusion channel is expanded and lithium ion diffusion resistance is lowered, thereby improving ionic conductivity of the material; and by taking a hard carbon component as a carbon coating agent ofthe negative electrode material, the negative electrode material is high in specific capacity and excellent in cycle performance and rate performance.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing an aluminum-iron-doped lithium titanate negative electrode material. Background technique [0002] Since lithium-ion batteries have been successfully commercialized, lithium-ion batteries have been widely used in electronic mobile devices such as mobile phones and notebook computers, and in small electric vehicles because of their significant advantages such as long life, high capacity, and high energy density. Also received much attention. [0003] In recent years, graphite has been widely used as an anode material for lithium-ion batteries, and is currently the mainstream anode material for commercial lithium-ion batteries. With the continuous modification of researchers, the performance has been greatly improved compared with the initial application, but its Still there is a lower theoretical capacity (372 mAh g -1 ) and other defects, which limit the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/587H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner SUZHOU SICHUANGYUANBO ELECTRONICS TECH CO LTD
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