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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  • 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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] According to the ratio of the amount of Li:(Ti+M) substance to 0.82:(0.95+0.05), weigh 30.00g of lithium hydroxide, 116.66g of titanium dioxide, 9.39g of zirconium oxide and 150ml of deionized water as the dispersion medium in a ball mill. Mixing for 4h, sintering at 800℃ for 20h, to obtain lithium titanate composite material precursor, the molecular formula is 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, according to m(carbon):m (Precursor)=0.015 Add citric acid and grind in a sand mill until D50 is 250nm. The final slurry obtained was spray dried, and the inlet temperature was 300°C. Under the protection of hydrogen, sintered at 800°C for 5 hours to obtain a nano-lithium titanate composite coated with carbon and zirconia.

[0039] After testing, the particle size D50 of th...

Example Embodiment

[0041] Example 2

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

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

Example Embodiment

[0045] Example 3

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

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

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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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