A Surfactant-Assisted Ultrathin Li 4 ti 5 o 12 Preparation method of nanosheets and method of use thereof in lithium batteries and sodium batteries

A surfactant and nanosheet technology, applied in the field of electrochemical power supply and energy storage, can solve the problems of easily polluted environment, impure products, complicated procedures, etc., and achieve the effects of high purity, single crystal phase structure, and simple process

Active Publication Date: 2017-12-22
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] First purpose of the present invention is to solve existing hydrothermal method and prepare nano-Li 4 Ti 5 o 12 The existence of repeated separation and washing, complex process, easy to pollute the environment, impure products and other shortcomings, to provide an efficient and environmentally friendly ultra-thin Li 4 Ti 5 o 12 Nano sheet electrode material and its preparation method, and the ultrathin Li that this kind of method synthesizes 4 Ti 5 o 12 Nanosheets used as anode materials for lithium-ion batteries have excellent high-rate charge-discharge performance

Method used

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  • A Surfactant-Assisted Ultrathin Li <sub>4</sub> ti <sub>5</sub> o <sub>12</sub> Preparation method of nanosheets and method of use thereof in lithium batteries and sodium batteries
  • A Surfactant-Assisted Ultrathin Li <sub>4</sub> ti <sub>5</sub> o <sub>12</sub> Preparation method of nanosheets and method of use thereof in lithium batteries and sodium batteries
  • A Surfactant-Assisted Ultrathin Li <sub>4</sub> ti <sub>5</sub> o <sub>12</sub> Preparation method of nanosheets and method of use thereof in lithium batteries and sodium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.3156g of P123 to 10ml of absolute ethanol, stir and dissolve in a water bath at 60°C, and configure solution A; add 3.8238g of tetrabutyl titanate to 20ml of In absolute ethanol, stir for 10 minutes to configure solution B, then add solution A dropwise to solution B, stir continuously for 5 hours, and configure solution C; dissolve 0.3864g lithium hydroxide monohydrate in 5ml deionized In water, configure solution D, then add solution D dropwise to solution C under stirring, and continue to stir for 30 minutes to obtain suspension E; move suspension E to a stainless steel reaction kettle lined with polytetrafluoroethylene , hydrothermal reaction at 160°C for 12 hours. After the reaction, cool to room temperature, and then dry at 80°C for 24 hours to obtain a lithium titanate precursor, and finally heat-treat the obtained precursor in a muffle furnace at 600°C for 3 hours to obtain an ultra-thin Li 4 Ti 5 o 12 nanosheet material. See figure 1 (a), figure 2 (...

Embodiment 2

[0032] Add 0.1583g of P123 to 10ml of absolute ethanol, stir and dissolve in a water bath at 50°C, and configure solution A; add 3.8247g of tetrabutyl titanate to 20ml of In absolute ethanol, stir for 20 minutes to configure solution B, then add solution A dropwise to solution B, stir continuously for 4 hours, and configure solution C; dissolve 0.39123g lithium hydroxide monohydrate in 5ml deionized In water, configure solution D, then add solution D dropwise to solution C under stirring, and continue stirring for 40 minutes to obtain suspension E; move suspension E to a stainless steel reaction kettle lined with polytetrafluoroethylene , hydrothermal reaction at 150°C for 24 hours. After the reaction, cool to room temperature, and then dry at 100°C for 20 hours to obtain a lithium titanate precursor. Finally, the obtained precursor is ground and heat-treated in a muffle furnace at 700°C for 2 hours to obtain an ultra-thin Li 4 Ti 5 o 12 nanosheet material.

Embodiment 3

[0034] Add 0.3142g of F127 to 10ml of absolute ethanol, stir and dissolve in a water bath at 60°C, and configure solution A; add 3.8247g of tetrabutyl titanate to 20ml of In absolute ethanol, stir for 20 minutes to configure solution B, then add solution A dropwise to solution B, stir continuously for 4 hours, and configure solution C; dissolve 0.3858g lithium hydroxide monohydrate in 5ml deionized In water, configure solution D, then add solution D dropwise to solution C under stirring, and continue stirring for 20 minutes to obtain suspension E; move suspension E to a stainless steel reaction kettle lined with polytetrafluoroethylene , hydrothermal reaction at 180°C for 18 hours. After the reaction, cool to room temperature, and then dry at 90°C for 10 hours to obtain Li 4 Ti 5 o 12 Precursor, and finally the obtained precursor was ground and heat-treated in a muffle furnace at 600 °C for 3 hours to obtain ultrathin Li 4 Ti 5 o 12 nanosheet materials, see image 3 (b)...

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Abstract

The invention relates to a preparation method for an ultra-thin Li4Ti5O12 nanosheet assisted by a surfactant, and a use method for the ultra-thin Li4Ti5O12 nanosheet in a lithium battery and a sodium battery, and belongs to the fields of electrochemical power supply and energy storage. According to the preparation method, a three block-polyether type surfactant is initially used to assist a hydrothermal method to synthesize a lithium titanate precursor, and then the lithium titanate precursor is sintered under an air atmosphere to obtain an ultra-thin nanosheet-shaped Li4Ti5O12 electrode material with the thickness of 3-10 nm; the synthesized ultra-thin nanosheet-shaped Li4Ti5O12 material takes metal lithium and metal sodium as negative electrodes to prepare a lithium ion battery and a sodium ion battery respectively; and the prepared ultra-thin nanosheet-shaped Li4Ti5O12 material is excellent in the high rate capability, high in specific capacity, can be widely applied to the lithium ion batteries required by various portable electronic equipment and various electric vehicles, and the lithium ion batteries for the related energy storage, and can be used for the lithium ion batteries with excellent performance as well.

Description

technical field [0001] The present invention relates to a surfactant-assisted ultrathin Li 4 Ti 5 o 12 The preparation method of the nano sheet and the application method in the lithium battery and the sodium battery belong to the field of electrochemical power source and energy storage. Background technique [0002] In the past decade, energy storage has increasingly become a hot spot of global attention. Due to the increase in energy demand, the rising cost of refining fossil fuels, and the severe environmental pollution caused by the use of fossil energy, people are seeking environmentally friendly energy production and storage methods. At present, large-scale energy storage technologies mainly include pumped water storage and air energy storage. However, the battery-based electrochemical energy storage technology has made many breakthroughs in recent years and has high expectations. It has high efficiency, flexible configuration, can meet the needs of different power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M10/0525H01M10/054B82Y30/00B82Y40/00C01G23/00
CPCB82Y30/00B82Y40/00C01G23/005H01M4/485H01M10/0525H01M10/054Y02E60/10
Inventor 项宏发邹海林郭鑫
Owner HEFEI UNIV OF TECH
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