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Spinel structure lithium titanate and preparation method and application thereof

A technology of structural lithium titanate and spinel, applied in structural parts, chemical instruments and methods, titanium compounds, etc., can solve the problems of affecting battery performance, imperfect grain structure, uneven particle size and morphology, etc. Simple method, excellent electrochemical performance, low cost effect

Active Publication Date: 2010-03-03
ANHUI KEDA BORUI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is in order to overcome the spinel structure lithium titanate Li that prior art synthesizes 4 Ti 5 o 12 Imperfect grain structure, uneven particle size and morphology, and the shortcomings of affecting battery performance, provide a spinel structure lithium titanate Li with perfect synthesis structure, uniform particle size and morphology, and excellent electrochemical performance. 4 Ti 5 o 12

Method used

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  • Spinel structure lithium titanate and preparation method and application thereof
  • Spinel structure lithium titanate and preparation method and application thereof
  • Spinel structure lithium titanate and preparation method and application thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned lithium titanate. The steps of the method include roasting the material containing the lithium source and the titanium source at a high temperature, and then keeping the material at a low temperature. The material containing lithium source and titanium source undergoes a sintering reaction under high temperature conditions, and the crystal lattice is perfected and the particle size is uniformly distributed under low temperature conditions to prepare lithium titanate with excellent electrochemical performance.

[0035] Among them, the temperature of high-temperature roasting is 700-1000°C, more preferably 800-900°C, the time of roasting is 5-20h, more preferably 8-12h; the present invention is to simplify the process and optimize the product, preferably only once The purpose of low temperature heat preservation is to achieve the perfect crystal lattice and uniform distribution of particle size ...

Embodiment 1

[0054] (1) Preparation of spinel lithium titanate material

[0055] 300g titanium dioxide (TiO 2 ), 116.6g lithium carbonate (Li 2 CO 3 ) was dispersed with absolute ethanol, mixed by ball milling, the speed of ball milling was 300rpm, the time of ball milling was 8h, and dried at 80°C; then placed in a crucible, kept at 800°C for 12h in a high-temperature resistance furnace; then cooled to 500°C for 5h, Cool down at a rate of 1°C / min, keep warm for 6h;

[0056] (2) Preparation of pole piece

[0057] Add 80 parts by weight of lithium titanate composite material, 10 parts by weight of binder polytetrafluoroethylene (PTFE), and 10 parts by weight of conductive agent acetylene black into 110 parts by weight of N-methylpyrrolidone (NMP) solution, and then stir to form Stable and uniform negative electrode slurry. After drying in a vacuum oven at 100° C. for 24 hours, take it out, and press it under a pressure of 4 MPa to form a pole piece with a thickness of 0.03 mm and a dia...

Embodiment 2

[0062] (1) Preparation of spinel lithium titanate material

[0063] The lithium titanate material was prepared by the same method and steps as in Example 1, except that the cooling rate from the high temperature calcination temperature to the low temperature holding temperature was 0.5°C / min, the low temperature holding temperature was 400°C, and the holding time was 4h; The prepared lithium titanate material is numbered as 2.

[0064] (2) Pole pieces and batteries were prepared in the same manner as in Example 1.

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Abstract

The invention provides spinel structure lithium titanate, which is prepared by performing high-temperature calcination and then performing low-temperature heat preservation on a material containing alithium source and a titanium source, wherein the crystal cell parameters of the lithium titanate are between 0.8355 and 0.8365 nanometer, the particle size distribution is between 300 nanometers and30 mum, D50 is between 500 nanometers and 1.5 mum, and crystal cells are developed perfectly with even particle size distribution and have excellent electrochemical properties. Simultaneously, the invention provides a preparation method of the spinel structure lithium titanate, which comprises the steps of performing high-temperature calcination and then performing low-temperature heat preservation on the material containing the lithium source and the titanium source, wherein the material containing the lithium source and the titanium source performs sintering reaction under a high-temperaturecondition, and the temperature of the material is maintained under a low-temperature condition to promote the crystal lattice perfection and the even particle size distribution of the lithium titanate and improve the electrochemical properties of the lithium titanate. The preparation method is simple, has low cost and is easy to implement. The spinel structure lithium titanate has wide application and can be used as an electrode material of batteries and capacitors with wide application, and the properties of application products are improved to a great extent.

Description

【Technical field】 [0001] The invention relates to a spinel structure lithium titanate and its preparation method and application. 【Background technique】 [0002] With the rapid development of information technology, the requirements of various electronic products for power supply are constantly increasing. Due to the advantages of high energy density, long cycle life, and no memory effect, lithium-ion batteries have always been a hot spot in research and development. At present, the negative electrode material of lithium-ion batteries mainly uses graphite as a research hotspot, but lithium batteries made of graphite negative electrodes have many disadvantages in the process of use, such as lithium dendrites may be generated during charging and discharging, and the battery is prone to short circuit and fire. And the hidden danger of explosion, it is also easy to react with the electrolyte to shorten the service life of the battery. [0003] Spinel structure lithium titanate...

Claims

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Application Information

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IPC IPC(8): C01G23/00H01M4/58H01G9/042
CPCY02E60/12Y02E60/10
Inventor 王斌徐茶清姜占锋
Owner ANHUI KEDA BORUI ENERGY TECH CO LTD
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