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Spherical spinel lithium titanate and preparation method and application thereof

A lithium titanate and spinel technology, which is applied in the field of spherical spinel lithium titanate and its preparation, can solve the problem that the chemical composition and morphology are difficult to precisely control, the tap density of lithium titanate materials is small, and the slurry treatment and Coating difficulties and other problems, to avoid decomposition or the formation of protective film, excellent cycle performance, excellent fluidity

Inactive Publication Date: 2014-07-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a spherical spinel lithium titanate, which aims to solve the problems of difficult precise control of the chemical composition and morphology of products prepared in the prior art, difficulties in slurry processing and coating, and solve the problems of the prior art. The tap density of the obtained lithium titanate material is small, the ion diffusion coefficient is low, the processability is poor, and the battery is large in volume and low in energy density.

Method used

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  • Spherical spinel lithium titanate and preparation method and application thereof
  • Spherical spinel lithium titanate and preparation method and application thereof
  • Spherical spinel lithium titanate and preparation method and application thereof

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Embodiment 1

[0030] (1) Dissolve 5g of cetyltrimethylammonium bromide and 45g of lithium acetate in 40g of absolute ethanol successively to obtain a mixed solution;

[0031] (2) 45g of butyl titanate was slowly added dropwise to the mixed solution under 1200rpm magnetic stirring to form a yellow transparent solution, and continued to stir for 12 hours to form a yellow transparent sol;

[0032] (3) aging the yellow transparent sol in the air for 1 to 3 days to form a white gel, and drying the obtained white gel in the air at 100°C for 24 hours to form a xerogel precursor;

[0033] (4) After grinding the dry gel precursor, pre-calcine at 700° C. for 4 hours, and heat-treat at 900° C. for 12 hours to obtain spherical spinel lithium titanate 1 .

Embodiment 2

[0035] (1) Dissolve 15g of cetyltrimethylammonium bromide and 30g of lithium acetate in 65g of absolute ethanol successively to obtain a mixed solution;

[0036] (2) 25g of butyl titanate was slowly added dropwise to the mixed solution under 2000rpm magnetic stirring to form a yellow transparent solution, and continued to stir for 12 hours to form a yellow transparent sol;

[0037] (3) aging the yellow transparent sol in the air for 1 to 3 days to form a white gel, and drying the obtained white gel in the air at 100°C for 24 hours to form a xerogel precursor;

[0038] (4) After the dry gel precursor is ground, pre-calcined at 800°C for 4h, and heat-treated at 700°C for 12h to obtain spherical spinel lithium titanate 2.

Embodiment 3

[0040] (1) Dissolve 10g of cetyltrimethylammonium bromide and 35g of lithium acetate in 50g of absolute ethanol successively to obtain a mixed solution;

[0041] (2) Slowly add 30 g of butyl titanate into the mixed solution under magnetic stirring at 1500 rpm to form a yellow transparent solution, and continue stirring for 12 hours to form a yellow transparent sol;

[0042] (3) aging the yellow transparent sol in the air for 1 to 3 days to form a white gel, and drying the obtained white gel in the air at 100°C for 24 hours to form a xerogel precursor;

[0043] (4) After grinding the dry gel precursor, pre-calcine at 900° C. for 4 hours, and heat-treat at 800° C. for 12 hours to obtain spherical spinel lithium titanate 3 .

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Abstract

The invention provides spherical spinel lithium titanate and a preparation method and an application thereof. The preparation method includes the following steps: successively dissolving cetyl trimethyl ammonium bromide and lithium acetate in absolute ethyl alcohol to obtain a mixed solution; slowly dripping butyl titanate into the mixed solution under magnetic force stirring to form a yellow transparent solution, and continuing to stir to form yellow transparent gel; aging the yellow transparent gel in the air to form white gel, drying the obtained white gel in the air at 100 DEG C to form a dry gel precursor; grinding the dry gel precursor, pre-sintering the dry gel precursor at 700-900 DEG C for 4 hours, and carrying out heat treatment at temperature of 700-900 DEG C for 12 hours to obtain the spherical spinel lithium titanate, and the spherical spinel lithium titanate can be applied in lithium ion battery cathode materials. The spherical spinel lithium titanate provided by the invention has the characteristics of high tap density, good processing performance, good compatibility with electrolyte, excellent electrochemical performance and the like, and is wide in preparation raw material source, low in cost, short in period, low in temperature, simple and reliable in process and easy to achieve industrial production.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a spherical spinel lithium titanate and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high voltage, high capacity, long cycle life, and small self-discharge. Lithium-ion batteries have been widely used in portable electronic products such as mobile phones, laptops, and cameras. In recent years, they have been used as power batteries and The application of energy storage power supply to hybrid vehicles, pure electric vehicles and renewable energy power stations is also getting louder and louder. In particular, as a power source, the requirements for electrode materials are very high. In addition to high specific energy and high specific power, cost, safety and cycle performance also need to meet the requirements. Spinel lithium titanate (Li 4 Ti 5 o 12 ) as a new type of anode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485C01G23/00
CPCC01G23/005H01M4/485H01M10/0525Y02E60/10
Inventor 李军李少芳李庆彪
Owner GUANGDONG UNIV OF TECH
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