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Method for preparing spinel type Li4Ti5O12 ultrathin nano-sheets

A spinel-type, nano-sheet technology, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low gram capacity, unfavorable high-rate cycle, etc., and achieve simple and easy process, good cycle performance, Inexpensive to prepare

Inactive Publication Date: 2020-02-28
西安越遴新材料研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to improve the Li 4 Ti 5 o 12 The electrochemical performance can effectively solve the Li 4 Ti 5 o 12 Li 4 Ti 5 o 12 nanosheet electrode materials, and provides a top-down method for preparing spinel-type Li 4 Ti 5 o 12 The method of ultrathin nanosheets

Method used

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  • Method for preparing spinel type Li4Ti5O12 ultrathin nano-sheets
  • Method for preparing spinel type Li4Ti5O12 ultrathin nano-sheets
  • Method for preparing spinel type Li4Ti5O12 ultrathin nano-sheets

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Embodiment

[0022] A preparation of spinel-type Li 4 Ti 5 o 12 The method for ultrathin nanosheets, comprising the following steps:

[0023] Step 1. Preparing original layered Na by sol-gel method 2 Ti3 o 7 Materials, including solution A and solution B, wherein the solution A is mixed successively with 10ml tetrabutyl titanate (TBOT) (Aladdin, ≥99.99%), 40ml ethanol (AR, ≥99.7%), 3ml acetic acid (AR , ≥99.8%), solution B is 1.038g Na 2 CO 3 (AR, ≥99.8%) was dissolved in 4ml of deionized water, under continuous magnetic stirring, solution B was added dropwise to solution A until a uniform semi-solid gel was formed, and the freeze-dried gel powder was heated at 780°C Heat treatment in air atmosphere to get Na 2 Ti 3 o 7 ;

[0024] Step 2, take by weighing the Na synthesized in 1g step 1 2 Ti 3 o 7 And dispersed in 300ml 0.5M (mol / L) HCl solution, stirred for 24 hours to make Na + H2Ti3O7 is obtained after being completely exchanged by H+, and then washed with deionized water ...

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Abstract

The invention discloses a method for preparing spinel type Li4Ti5O12 ultrathin nano-sheets. The method comprises: 1, preparing an original layered Na2Ti3O7 material by adopting a sol-gel method; 2, dispersing Na2Ti3O7 in an HCl solution, and stirring for enough time, so that Na<+> is completely exchanged by H <+> to obtain H2Ti3O7; 3, putting the H2Ti3O7 into a methylamine aqueous solution, and carrying out a hydrothermal reaction on the mixed solution to obtain a methylamine intercalation compound (MA / Ti3O7); 4, dispersing the MA / Ti3O7 in water, stripping the MA / Ti3O7 into nano-sheets by utilizing shearing force provided by an ultrasonic means, centrifuging the mixed solution to remove the unstripped precipitate, taking the supernatant, and drying to obtain MA / Ti3O7 nano-sheets; 5, dispersing the MA / Ti3O7 nano-sheets in a LiOH aqueous solution, and carrying out a hydrothermal reaction to obtain Li2Ti3O7 nano-sheet; and 6, carrying out heat treatment on the Li2Ti3O7 nano-sheets prepared in the step 5 in an air atmosphere to finally obtain the Li4Ti5O12 nano-sheets. According to the invention, with the method, the problems that the capacity of Li4Ti5O12 g is low and high-rate circulation is not facilitated can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a top-down method for preparing spinel-type Li 4 Ti 5 o 12 method for ultrathin nanosheets. Background technique [0002] Lithium-ion batteries have gradually become the most promising energy storage devices due to their high energy density, long cycle life, and environmental friendliness. In lithium-ion battery anode materials, spinel-type Li 4 Ti 5 o 12 It has its unique advantages, which exhibit rare zero-dimensional strain (less than 0.2%), ultra-high cycle stability and cycle reversibility, and extremely stable voltage platform (1.55V vs Li / Li + ). However, lower electronic conductivity (<10 -13 S cm -1 ) and ionic conductivity (10 -9 –10 -13 cm 2 the s -1 ) severely limits the Li 4 Ti 5 o 12 cycle performance. The traditional improvement method is mainly to improve the electronic conductivity through doping and coating, and to improve the ion condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/485B82Y40/00
CPCB82Y40/00C01G23/005C01P2004/24H01M4/485Y02E60/10
Inventor 马越
Owner 西安越遴新材料研究院有限公司
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