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Carbon-coated mesoporous lithium titanate anode material of lithium ion battery and method for preparing carbon-coated mesoporous lithium titanate anode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as performance that cannot meet actual needs, and achieve easy control of preparation parameters, high charge and discharge capacity, and excellent electrochemical performance Effect

Active Publication Date: 2012-07-04
重庆中纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods for Li 4 Ti 5 o 12 The magnification performance has been improved, but its performance still cannot meet the actual needs

Method used

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  • Carbon-coated mesoporous lithium titanate anode material of lithium ion battery and method for preparing carbon-coated mesoporous lithium titanate anode material
  • Carbon-coated mesoporous lithium titanate anode material of lithium ion battery and method for preparing carbon-coated mesoporous lithium titanate anode material
  • Carbon-coated mesoporous lithium titanate anode material of lithium ion battery and method for preparing carbon-coated mesoporous lithium titanate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 1.2 g of glycine to 60 mL of absolute ethanol under stirring, stir for 1 h, then let stand for 20 min to remove the precipitate, and take the upper suspension for later use. Add 3 ml of tetrabutyl titanate to the suspension under stirring, stir for 1 h, then add 0.2961 g of lithium hydroxide, and stir for 2 h. The obtained solution was poured into a reaction kettle with a capacity of 100ml, and the filling degree was 60%, and reacted in an oven at 200°C for 20h. After the reaction kettle is lowered to room temperature, the product is collected, and the product is centrifuged and washed with ethanol, and finally the washed product is put into an oven, and after drying, the original crystal of lithium titanate is obtained. The obtained lithium titanate raw crystal was calcined at 500° C. for 2 hours under nitrogen atmosphere to obtain gray lithium titanate powder. That figure 1 The X-ray diffraction pattern of the lithium titanate powder prepared in this example sho...

Embodiment 2

[0033] Add 1.2 g of glycine to 60 mL of absolute ethanol under stirring, stir for 1 h, then let stand for 20 min to remove the precipitate, and take the upper suspension for later use. Add 3 ml of tetrabutyl titanate to the suspension under stirring, stir for 1 h, then add 0.2961 g of lithium hydroxide, and stir for 2 h. The obtained solution was poured into a reaction kettle with a capacity of 100ml, and the filling degree was 60%, and reacted in an oven at 200°C for 20h. After the reaction kettle was lowered to room temperature, the product was collected, washed by centrifugation with ethanol, and dried to obtain the original crystal of lithium titanate. The obtained lithium titanate raw crystal was calcined at 300° C. for 0.5 h under a nitrogen atmosphere to obtain gray lithium titanate powder. The results of X-ray diffraction pattern show that its phase is lithium titanate with cubic spinel structure. Through elemental analysis, its carbon content is 0.8%. By electron p...

Embodiment 3

[0035] Add 0.02g of lysine to 60mL of isopropanol under stirring, stir for 1h, slowly add 1.5ml of tetrabutyl titanate dropwise into the suspension under stirring, stir for 1h, then add 0.2432g of lithium nitrate, Stir for 2h. The obtained solution was poured into a reaction kettle with a capacity of 100ml, and the filling degree was 80%, and reacted in an oven at 150°C for 72h. After the reaction kettle was lowered to room temperature, the product was collected, washed by centrifugation with ethanol, and dried to obtain the original crystal of lithium titanate. The obtained primary crystal of lithium titanate was calcined at 900° C. for 72 hours under nitrogen atmosphere to obtain gray lithium titanate powder. The results of X-ray diffraction pattern show that its phase is lithium titanate with cubic spinel structure. Through elemental analysis, its carbon content is 0.5%. By electron paramagnetic resonance spectroscopy, it can be seen that the sample has oxygen vacancies ...

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Abstract

The invention discloses a carbon-coated mesoporous lithium titanate anode material of a lithium ion battery and a method for preparing the carbon-coated mesoporous lithium titanate anode material. A particle aggregate with the diameter of 0.1 to 10 mu m is formed by self-assembling nano-crystals with the diameter of 5 to 150 nm. The material has a mesoporous structure, the average pore diameter of the material is 2 to 6 nm, and the carbon content of the material is 0.5 to 5 percent. A lithium titanate sample can serve as an anode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a carbon-coated mesoporous lithium titanate lithium ion battery negative electrode material in the field of lithium ion batteries and a preparation method thereof. Background technique [0002] With the increasing shortage of global resources and the continuous deterioration of the environment, the development of green renewable new energy has gradually attracted people's attention, and clean energy storage equipment has attracted great attention from all over the world. Lithium-ion batteries have the advantages of high voltage, high capacity, small size, light weight, no memory function, long cycle life, good safety performance, etc., and have little pollution. Electric vehicles, space technology and other fields have broad application prospects, and are currently energy storage devices that various countries are committed to developing. Although graphite-based carbon negative electrodes widely used at present have low cost a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485C01G23/00
CPCY02E60/122Y02E60/10
Inventor 李广社陈小梅关翔锋李莉萍
Owner 重庆中纳科技有限公司
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