Fluorophosphate coated lithium titanate composite material as well as preparation method and application thereof

A technology of coating lithium titanate with fluorophosphate and lithium titanate with phosphate, which is applied in the field of lithium-ion battery anode materials, can solve problems such as gas production, unfavorable industrial production, and cumbersome operation, and achieve the coating layer The effect of controllable thickness, improved conductivity, and huge economic benefits

Inactive Publication Date: 2018-03-06
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is cumbersome to operate, does not utilize industrial production, and cannot solve the problem of excessive gas production

Method used

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  • Fluorophosphate coated lithium titanate composite material as well as preparation method and application thereof
  • Fluorophosphate coated lithium titanate composite material as well as preparation method and application thereof
  • Fluorophosphate coated lithium titanate composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) After mixing lithium acetate and ethyl titanate in molar amounts Li:Ti=1:1.25 evenly, raise it from room temperature to 700°C at 1°C / min in nitrogen, keep it warm for 12 hours, and then heat it at 5°C / min Cool rapidly to room temperature to obtain lithium titanate.

[0056] (2) Dissolve lithium titanate in deionized water, stir evenly, add 0.01wt% (based on the mass of lithium titanate as 100wt%) lithium aluminum fluorophosphate, and dry at 150°C for 2 minutes on a spray dryer to form aluminum fluorophosphate Lithium is coated on the surface of lithium titanate particles, and then put into a reaction vessel, heated to 400°C in a microwave sintering furnace and kept for 30 minutes, then cooled to room temperature at 5°C / min, then removed from the reaction vessel, and the lithium aluminum fluorophosphate package inside is taken out Coated lithium titanate composite material.

[0057] test:

[0058] Using the lithium titanate composite material coated with lithium al...

Embodiment 2

[0065] (1) After mixing lithium carbonate and titanium dioxide in molar amounts Li:Ti=1:1.25 evenly, rise from room temperature to 800°C at 3°C / min in hydrogen, keep warm for 10 hours, and then rapidly cool at 10°C / min to Lithium titanate was obtained at room temperature.

[0066] (2) Dissolve lithium titanate in ethanol, stir evenly, add 0.05wt% (based on the mass of lithium titanate as 100wt%) nickel lithium fluorophosphate, dry at 150°C for 1min on a spray dryer to form lithium nickel fluorophosphate Coated on the surface of lithium titanate particles, then put into a reaction vessel, heated to 600°C in a microwave sintering furnace and kept for 20 minutes, then cooled to room temperature at 10°C / min, then removed from the reaction vessel, and took out the lithium nickel fluorophosphate coating inside Lithium titanate composite material.

[0067] test:

[0068] The nickel-lithium fluorophosphate-coated lithium titanate composite material of this example was used as the ne...

Embodiment 3

[0070] (1) After mixing lithium hydroxide and tetrabutyl titanate in a molar amount Li:Ti=1:1.25 evenly, heat it from room temperature to 700°C at 2°C / min in carbon dioxide, keep it warm for 8 hours, and then heat it at 5°C / min is rapidly cooled to room temperature to obtain lithium titanate.

[0071] (2) Dissolve lithium titanate in ethanol, stir evenly, add 0.10wt% (based on the mass of lithium titanate as 100wt%) lithium manganese fluorophosphate, and dry at 160°C for 1 min on a spray dryer to form lithium manganese fluorophosphate Coated on the surface of lithium titanate particles, then put into a reaction container, heated to 500°C in a microwave sintering furnace and kept for 30 minutes, then cooled to room temperature at 10°C / min, then removed from the reaction container, and took out the lithium manganese fluorophosphate coating inside Lithium titanate composite material.

[0072] The lithium manganese phosphate-coated lithium titanate composite material of this exa...

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Abstract

The invention relates to a fluorophosphate coated lithium titanate composite material as well as a preparation method and application thereof. The composite material is prepared from lithium titanateand a fluorophosphates coated layer which covers the surface of the lithium titanate. The method comprises the following steps: dissolving the lithium titanate into a solvent; after uniformly stirring, adding fluorophosphates; carrying out low-temperature spraying and drying to form a fluorophosphates coated object on the surfaces of lithium titanate particles; then carrying out microwave-method high-temperature sintering to obtain the fluorophosphate coated lithium titanate composite material. According to the fluorophosphate coated lithium titanate composite material provided by the invention, the discharging capacity, the circulating performance and the rate performance are remarkably improved; a lithium-ion battery which is prepared by taking the composite material as a negative electrode material not only has good conductivity, high rate capacity and long cycle life, but also has the advantage of less produced gas, so that the fluorophosphate coated lithium titanate composite material has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and relates to a fluorophosphate-coated lithium titanate composite material, its preparation method and application, in particular to a fluorophosphate-coated lithium titanate composite material, its preparation method and the The composite material is used as negative electrode material in lithium ion battery. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ) to lithium has a potential of 1.55V, a theoretical specific capacity of 175mAh / g, and an actual specific capacity of 160-170mAh / g. Lithium titanate has a face-centered cubic spinel structure, the space group is Fd3m, the unit cell parameter a=0.836nm, the potential is higher than that of graphite, and it is not easy to produce lithium dendrites; and it can accommodate 3 lithium ions during charging and discharging, intercalation and desorption Embedding has almost no effect on the crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 严武渭杨顺毅张红来黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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