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Preparation method for fluorine-doping Li4Ti5O12 nanosheet

A lithium titanate, fluorine doping technology, applied in titanate, nanotechnology, nanotechnology and other directions, can solve the problems of rapid capacity decay and poor performance, and achieve improved electrochemical performance, uniform morphology and good crystallinity Effect

Active Publication Date: 2016-08-10
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li 4 Ti 5 o 12 It is a nearly insulating material, which leads to fast capacity decay and poor performance at high rates

Method used

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  • Preparation method for fluorine-doping Li4Ti5O12 nanosheet
  • Preparation method for fluorine-doping Li4Ti5O12 nanosheet
  • Preparation method for fluorine-doping Li4Ti5O12 nanosheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 0.168 g of lithium hydroxide monohydrate, 1.7 g of tetrabutyl titanate, 0.015 g of lithium fluoride, and 20 mL of absolute ethanol in a 100 mL three-necked flask, stir for 12 hours in a dry environment, and then add 25 mL of deionized After the water was vigorously stirred for 0.5 h, the milky white solution was placed in a 50 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at 180 °C for 36 h. The white powder deposited in the reactor was taken out, washed with absolute ethanol three times, centrifuged, and dried in an oven at 60 °C for 8 h to obtain the precursor of fluorine-doped lithium titanate nanosheets. The precursor was placed in a tube furnace and calcined at 600 °C for 6 h under the protection of argon atmosphere to obtain fluorine-doped lithium titanate nanosheets.

Embodiment 2

[0022] Take 0.189 g of lithium hydroxide monohydrate, 1.7 g of tetrabutyl titanate, 0.010 g of lithium fluoride, and 20 mL of absolute ethanol in a 100 mL three-necked flask, stir for 12 hours in a dry environment, and then add 25 mL to After the deionized water was vigorously stirred for 0.5 h, the milky white solution was placed in a 50 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at 160 °C for 20 h. The white powder deposited in the reactor was taken out, washed with absolute ethanol three times, centrifuged, and dried in an oven at 60 °C for 8 h to obtain the precursor of fluorine-doped lithium titanate nanosheets. The precursor was placed in a tube furnace and calcined at 800 °C for 5 h under the protection of argon atmosphere to obtain fluorine-doped lithium titanate nanosheets.

Embodiment 3

[0024]Take 0.204 g of lithium hydroxide monohydrate, 1.7 g of tetrabutyl titanate, 0.005 g of lithium fluoride, and 20 mL of absolute ethanol in a 100 mL three-necked flask, stir for 12 hours in a dry environment, and then add 25 mL to After the ionic water was vigorously stirred for 0.5 h, the milky white solution was placed in a 50 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at 200 °C for 24 h. The white powder deposited in the reactor was taken out, washed with absolute ethanol three times, centrifuged, and dried in an oven at 60° C. for 8 hours to obtain a fluorine-doped lithium titanate nanosheet precursor. The precursor was placed in a tube furnace and calcined at 700 °C for 4 h under the protection of argon atmosphere to obtain fluorine-doped lithium titanate nanosheets.

[0025] 2. Verification effect:

[0026] figure 1 It is the transmission electron microscope picture of the pure lithium titanate nanosheet synthesized by the above e...

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Abstract

The invention relates to a preparation method for a fluorine-doping Li4Ti5O12 nanosheet, and belongs to the technical field of production of an energy material of a lithium ion battery. The Li4Ti5O12 nanosheet is synthesized by a hydrothermal method, thus, the contact surface between a material and an electrode can be remarkably expanded, and the electrochemical performance of the material can be further improved; with the doping of fluorine atoms, a part of lattice oxygen atoms can be substituted by the fluorine atoms to form Ti-F bonds; according to charge conservation, the material charge is out of balance due to the introduction of F; in order to ensure the charge conservation of the material, a part of Ti<4+> can be converted to Ti<3+>, so that the conductivity of the material is improved; and through the doping of F, the obtained product is uniform in morphology, high in crystallinity and large in specific area, and the electrochemical performance at high rate can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery energy material production. Background technique [0002] With the aggravation of global energy crisis and environmental pollution, the development and application of new energy is imperative. At present, secondary batteries are widely used in the field of energy storage. As one of them, lithium-ion batteries are widely used due to their long cycle life, large specific capacity, no memory effect, high working voltage, and no pollution to the environment. In various small portable devices such as mobile phones, digital cameras, and laptop computers. Nowadays, various commercial lithium-ion battery anode materials are mainly carbon-based materials. However, there are disadvantages in the application of lithium-ion batteries with carbon as the anode. For example, lithium dendrites are easily precipitated during overcharging, causing short circuits , which affects the safety performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/0525C01G23/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/005C01P2002/72C01P2004/04C01P2004/20C01P2004/62C01P2004/64H01M4/485H01M10/0525Y02E60/10
Inventor 陈铭张鹏飞吴倩卉刁国旺
Owner YANGZHOU UNIV
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