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Shape-controllable nano lithium titanate composite and preparation method thereof and lithium ion battery

A nano-lithium titanate and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as insufficient rate performance and cycle performance of lithium-ion batteries, improve stability and conductivity, and inhibit flatulence. Effect

Inactive Publication Date: 2016-08-17
北京泰和九思科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing related technologies have not comprehensively solved the problem from the aspects of primary particle nanosizing, doping, and multiple coatings. The rate performance and cycle performance of lithium-ion batteries made of existing lithium titanate composite materials are still not good enough.

Method used

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  • Shape-controllable nano lithium titanate composite and preparation method thereof and lithium ion battery
  • Shape-controllable nano lithium titanate composite and preparation method thereof and lithium ion battery
  • Shape-controllable nano lithium titanate composite and preparation method thereof and lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]According to the ratio of Li:(Ti+M) substance amount is 0.82:(0.95+0.05), respectively weigh lithium hydroxide 30.00g, titanium dioxide 116.66g, zirconia 9.39g and dispersion medium deionized water 150ml and fully Mix for 4 hours and sinter at 800°C for 20 hours to obtain a lithium titanate composite material precursor with the molecular formula Li 4 Ti 4.95 Zr 0.05 o 12 . Weigh 100g of the crushed lithium titanate composite precursor and add it to 400g of deionized water to form a slurry. At the same time, add zirconium hydroxide according to n(Zr):n(precursor)=0.01, and add zirconium hydroxide according to m(carbon):m (Precursor) = 0.015 Add citric acid and grind in a sand mill until D50 is 250nm. The resulting final slurry was spray dried with an inlet temperature of 300°C. Under the protection of hydrogen, it was sintered at 800°C for 5h to obtain a nano-lithium titanate composite material coated with carbon and zirconia.

[0039] After testing, the particle si...

Embodiment 2

[0042] According to the ratio of Li:(Ti+M) substance amount is 0.82:(0.92+0.08), respectively weigh 60.00g of lithium oxalate, 67.43g of metatitanic acid, 7.60g of molybdenum dioxide and 150ml of methanol as a dispersion medium and fully Mix for 2 hours and sinter at 850°C for 15 hours to obtain a lithium titanate composite material precursor with the molecular formula Li 4 Ti 4.92 Mo 0.08 o 12 . Weigh 100g of the crushed lithium titanate composite material precursor and add it to 300g of ethanol, configure it into a slurry, and add alumina according to n(Al):n(precursor)=0.025, and add according to m(carbon):m (Precursor) = 0.15 Add sucrose and grind in a sand mill until D50 is 150nm. The resulting final slurry was subjected to dynamic vacuum drying at a drying temperature of 70 °C. In methane atmosphere, sintering at 700°C for 8h, to obtain nano-lithium titanate composite material coated with carbon and aluminum oxide.

[0043] After testing, the particle size D50 of t...

Embodiment 3

[0046] According to the ratio of Li:(Ti+M) substance amount is 0.85:(0.94+0.06), respectively weigh 40.00g of lithium carbonate, 95.09g of titanium dioxide, 3.85g of aluminum oxide and 150ml of deionized water and mix them fully in a ball mill for 2h, Sintering at 1000°C for 2 hours to obtain the precursor of lithium titanate composite material, the molecular formula is Li 4 Ti 4.94 Al 0.06 o 12 . Weigh 100g of the crushed lithium titanate composite material precursor and add it to 300g deionized water to form a slurry, and add molybdenum dioxide according to n(Mo):n(precursor)=0.04, and according to m(carbon): m (precursor) = 0.2 Add citric acid and grind in a sand mill until D50 is 350nm. The resulting final slurry was spray dried with an inlet temperature of 300°C. Sintering at 500° C. for 10 h in an air atmosphere to obtain a molybdenum dioxide-coated nano-lithium titanate composite material.

[0047] After testing, the particle size D50 of the nano-lithium titanate ...

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Abstract

The invention relates to shape-controllable nano lithium titanate composite and a preparation method thereof and a lithium ion battery. The preparation method includes (1) uniformly mixing a lithium source and a titanium source, sintering and cracking all mixtures to obtain a precursor of lithium titanate composite; (2) adding the precursor of lithium titanate composite into dispersion media that is then added with organic carbon source, grinding until particle size of the precursor of lithium titanate composite in all mixtures reaches the nano scale, and obtaining lithium titanate composite pulp; (3) drying, cracking and sintering the lithium titanate composite pulp to obtain the product. Through grinding the precursor of lithium titanate composite to the nano scale and adjusting the second sintering process, particle size of the product can be effectively controlled and particle shape can be so changed. In addition, with doping, carbon wrapping, and oxide wrapping, composite modification of the lithium titanate composite can be realized. Therefore, performance about capacity, magnification, cycling and so on of the lithium titanate is optimized.

Description

technical field [0001] The invention belongs to the technical field of lithium titanate composite materials, and in particular relates to a shape-controllable nanometer lithium titanate composite material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in mobile communications, portable digital devices and other products due to their advantages such as high specific energy, long cycle life, no memory effect and environmental friendliness. In recent years, it has shown good application prospects in the fields of energy storage equipment such as new energy vehicles, electric tools, aerospace satellites, and military equipment. [0003] At present, the anode materials of lithium-ion batteries are mostly carbon materials, but because the potential of the carbon electrode is close to that of metal lithium after lithium intercalation, metal lithium is easily precipitated on the surface of the carbo...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/36H01M10/0525
CPCH01M4/362H01M4/485H01M10/0525Y02E60/10
Inventor 白欧张志勇杨鹏李思昊
Owner 北京泰和九思科技有限公司
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