Fast ion conductor modified lithium ion battery cathode material lithium cobalt oxide with fast ion conductor and preparation method

A lithium-ion battery and ion conductor technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems that cannot meet commercial applications, achieve the effects of improving overcharge performance and safety performance, avoiding direct contact, and increasing battery capacity

Inactive Publication Date: 2011-02-09
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the positive electrode material modified by these oxide coatings has been improved, but it still cannot meet the requirements of commercial applications.

Method used

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  • Fast ion conductor modified lithium ion battery cathode material lithium cobalt oxide with fast ion conductor and preparation method
  • Fast ion conductor modified lithium ion battery cathode material lithium cobalt oxide with fast ion conductor and preparation method
  • Fast ion conductor modified lithium ion battery cathode material lithium cobalt oxide with fast ion conductor and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 0.2003g of lithium carbonate, 2.7115g of aluminum nitrate and 1.2472g of ammonium dihydrogen phosphate, put the three in a 400ml beaker and stir evenly in a water bath, the temperature of the water bath is 80°C, the stirring speed is 80Hz, and the pH value is adjusted to 8.5 by adding ammonia water dropwise. Weigh 100g of lithium cobaltate, add it into a beaker and continue to stir, impregnate, evaporate to dryness and dry at 150°C for 24h. The obtained powder is roasted in a bell-type furnace, and the roasting system is: 10°C / min to 700°C, heat preservation for 10h, and cool down with the furnace. Through physical and chemical analysis, it is concluded that the surface of the raw material lithium cobaltate is coated with a fast ion conductor layer with an average thickness of about 50nm, and its molecular expression is: Li 3 al 2 P 3 o 12 , the total coating amount is: 1.3% (mass fraction), and the electron microscope photos of the sample show that the microsc...

Embodiment 2

[0047] Weigh 0.7015g, 4.3765g, 0.1159g and 1.9969g of lithium hydroxide, n-butyl titanate, silicon dioxide and ammonium dihydrogen phosphate respectively, put the four in a 100ml beaker and stir evenly in a water bath, the temperature of the water bath is 80°C, The stirring speed was 100 Hz, and ammonia water was added dropwise to adjust the pH value to 9.0. Weigh 150g of lithium cobaltate, add it into a beaker and continue stirring for 2h, filter with suction, and dry the filter cake at 120°C for 24h. The obtained powder is roasted in a bell-type furnace, and the roasting system is as follows: 5°C / min to 900°C, heat preservation for 5h, and cooling with the furnace. Through physical and chemical analysis, it is concluded that the surface of the raw material lithium cobaltate is coated with a fast ion conductor layer with an average thickness of about 120nm, and its molecular expression is: Li 1.3 Ti 2 Si 0.3 P 2.7 o 12 , the total coating amount is: 3.0% (mass fraction),...

Embodiment 3

[0049] Weigh 0.2297g, 0.0098g and 1.7890g of aluminum chloride, n-butyl titanate and lithium dihydrogen phosphate respectively, put the three in a 700ml beaker and stir evenly in a water bath, the temperature of the water bath is 60°C, the stirring speed is 100Hz, and ammonia water is added dropwise Adjust the pH value to 10.0. Weigh 100g of lithium manganate, add it into a beaker and continue stirring for 4h, filter with suction, and dry the filter cake at 120°C for 36h. The obtained powder is roasted in a bell-type furnace, and the roasting system is as follows: 3°C / min to 600°C, heat preservation for 8h, and cooling with the furnace. Through physical and chemical analysis, it is concluded that the surface of the raw material lithium manganate is coated with a fast ion conductor layer with an average thickness of about 100nm, and its molecular expression is: LiTi 2 P 3 o 12 -Li 2 O, the total coating amount is: 1.9% (mass fraction), the modified material is packed into a...

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Abstract

The invention discloses a fast ion conductor modified lithium ion battery anode material lithium cobalt oxide comprising lithium cobalt oxide and a lithium fast ion conductor layer coating the outer surface of the lithium cobalt oxide. The lithium fast ion conductor layer comprises the components of Li1+x+yAxB2-xSiyP3-yO12-eN, wherein A is one or more than one of Al, Sc, La, Cr, Fe, Tl, Eu and In, B is one or more than one of Ti, Zr and Hf, N is one or more than one of Li2O, MgO and Y2O3, and x, y and e are all not less than 0 and not more than 2. The preparation method of the fast ion conductor modified lithium ion battery anode material lithium cobalt oxide comprises the following steps of: evenly mixing A, B an N sources, lithium salt, a silicon source, a phosphorus source and a lithium ion battery anode material to be modified, carrying out the processes of drying, roasting, crushing, screening and the like to prepare the lithium ion battery anode material coated with a phosphate system on the surface. The modified anode material lithium cobalt oxide not only can work under a higher voltage and greatly improve the battery capacity, but also greatly improves the cycle performance, the multiplying power performance, the overcharging performance and the safety performance thereof.

Description

technical field [0001] The invention relates to lithium cobalt oxide, a cathode material of a lithium ion battery modified by a fast ion conductor in a phosphate system, and a preparation method thereof, belonging to the technical field of preparation of new energy materials. Background technique [0002] Because lithium-ion batteries have the advantages of high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they have not only been widely used in mobile phones, notebook computers, video cameras, digital cameras, etc. and other civilian and military fields, and is expected to be expanded in electric vehicles, aerospace and energy storage. [0003] In recent years, due to the continuous improvement of the performance of mobile devices and communication equipment, higher requirements have been put forward for the energy density, cycle life, high current input and output performance and high temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 徐宁吕菲肖彩英吴孟涛
Owner TIANJIN B&M SCI & TECH
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