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Lithium titanate material and preparation method thereof

A lithium titanate, the technology of lithium titanate, applied in the directions of titanate, alkali metal titanate, chemical instruments and methods, etc., can solve the problems of poor electronic conductivity and rate performance, so as to improve the electronic conductivity, The effect of improving rate capability and electrochemical kinetic performance

Active Publication Date: 2018-12-14
CHINA ELECTRONICS PROD RELIABILITY & ENVIRONMENTAL TESTING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor electronic conductivity and rate performance of lithium titanate materials in the prior art, thereby providing a lithium titanate material, and further providing its preparation method and lithium titanate battery

Method used

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  • Lithium titanate material and preparation method thereof
  • Lithium titanate material and preparation method thereof
  • Lithium titanate material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] The preparation method of the hollow cubic lithium titanate material provided in this embodiment includes the following steps:

[0042] (1) Precursor cube CaTiO 3 preparation of

[0043] Weigh 0.11g of calcium chloride, 0.33g of butyl titanate, 0.5g of polyethylene glycol (PEG) 200 and 35mL of absolute ethanol and add them into a 50mL reaction kettle, and ultrasonically mix them for 30min at room temperature; Add 0.24g of sodium hydroxide under continuous stirring, and stir evenly. After the sodium hydroxide is dissolved, seal the reactor and heat it at 150°C for 20h. After the reactor is cooled to room temperature, filter it. and distilled water for three times, and dried overnight at 60°C to obtain the precursor cubic CaTiO 3 ;

[0044] (2) Hollow cube TiO 2 preparation of

[0045] Get the precursor cube CaTiO that 75mg step (1) makes 3 Place it in a 50mL reaction kettle, add 300mg of ethylenediaminetetraacetic acid disodium (EDTA-2Na), and add 30mL of water and 1...

Embodiment 2

[0052] The preparation method of the hollow cubic lithium titanate material provided in this embodiment includes the following steps:

[0053] (1) Precursor cube CaTiO 3 preparation of

[0054] Weigh 0.11g of calcium chloride, 0.33g of isopropyl titanate, 0.4g of polyethylene glycol (PEG) 1600 and 38mL of absolute ethanol and add them into a 50mL reaction kettle, and mix them uniformly by ultrasonication at room temperature for 30min; then Add 0.24g of sodium hydroxide under continuous stirring, and stir evenly. After the sodium hydroxide is dissolved, seal the reactor and heat it at 160°C for 18 hours. Wash with ethanol and distilled water three times, and dry overnight at 60 °C to obtain the precursor cubic CaTiO 3 ;

[0055] (2) Hollow cube TiO 2 preparation of

[0056] Get the precursor cube CaTiO that 100mg step (1) makes 3 Put it into a 50mL reaction kettle, add 600mg of dipotassium ethylenediaminetetraacetic acid (EDTA-2K), and add 40mL of water and 10mL of ethyle...

Embodiment 3

[0060] The preparation method of the hollow cubic lithium titanate material provided in this embodiment includes the following steps:

[0061] (1) Precursor cube CaTiO 3 preparation of

[0062] Weigh 0.11g of calcium chloride, 0.33g of butyl titanate, 0.5g of polyethylene glycol (PEG) 800 and 35mL of absolute ethanol and add them into a 50mL reaction kettle, and mix them uniformly by ultrasonication at room temperature for 30min; Add 0.24g of sodium hydroxide under continuous stirring, and stir evenly. After the sodium hydroxide is dissolved, seal the reactor and heat at 180°C for 15 hours. and distilled water for three times, and dried overnight at 60°C to obtain the precursor cubic CaTiO 3 ;

[0063] (2) Hollow cube TiO 2 preparation of

[0064] Get the precursor cube CaTiO that 75mg step (1) makes 3 Put it in a 50mL reaction kettle, add 400mg of ethylenediaminetetraacetic acid disodium (EDTA-2Na), and add 30mL of water and 10mL of ethylene glycol to form a mixture. Th...

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Abstract

The invention provides a lithium titanate material, a preparation method thereof and a lithium titanate battery containing the lithium titanate material and belongs to the technical field of preparation of a lithium ion battery negative electrode material. The lithium titanate material has a hollow cubic structure. The hollow cubic structure can significantly increase the specific surface area ofthe lithium titanate material, shorten an electron transport path, improve the electronic conductivity of the lithium titanate material and improve the electrochemical kinetic performance. Through thecubic morphology design, the stability of the micron-sized cube morphology is improved and the active crystal face of the nano-sized particles is exposed so that the rate performance and electrochemical activity of the lithium titanate material are improved. Compared with the existing lithium titanate, the lithium titanate material has a better specific surface area, a stable structure and higherreaction activity.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to a lithium titanate material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s. It has the advantages of good voltage platform, excellent cycle stability and thermal stability, and low price. It is widely used in mobile phones, notebook computers, portable Power tools, electronic instruments and electric vehicles and other fields. Lithium titanate (Li 4 Ti 5 o 12 ) As a common material for the negative electrode of lithium-ion batteries, it has the advantages of "zero strain" lithium intercalation structure, long cycle life, stable charge and discharge voltage platform and excellent safety performance, and is cheap and easy to prepare, so it is favored It has attracted extensive atten...

Claims

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Application Information

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IPC IPC(8): C01G23/00
CPCC01G23/005C01P2002/72C01P2004/03C01P2004/04C01P2004/38
Inventor 陈程成赵振博魏勇李勇
Owner CHINA ELECTRONICS PROD RELIABILITY & ENVIRONMENTAL TESTING RES INST
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