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Sea urchin-like lithium titanate microsphere preparation method

A lithium titanate, sea urchin-shaped technology, applied in the field of preparation of sea urchin-shaped lithium titanate microspheres, can solve the problems of fast capacity decay and low conductivity of lithium titanate, and achieve high discharge specific capacity and excellent rate cycle performance. Effect

Inactive Publication Date: 2015-08-05
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of sea urchin-shaped lithium titanate microspheres, which solves the problem that the conductivity of lithium titanate is relatively low and the capacity decays quickly when working in a high-magnification environment

Method used

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Examples

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Effect test

Embodiment 1

[0038] (1) Add metal titanium powder to 5mol / L sodium hydroxide solution, wherein the amount of metal titanium powder added is 0.1g / L, stir magnetically for 1-100 minutes, and then transfer the mixed solution into polytetrafluoroethylene Lined stainless steel reaction kettle, sealed and placed in an oven, hydrothermal reaction at 80-220°C for 1-48 hours.

[0039] (2) After the reaction, cool to room temperature, centrifuge the obtained precipitate, wash until the pH value is 7.0, and then dry the precipitate in an oven at 60-90° C. to obtain a titanium dioxide precursor.

[0040] (3) Take a certain amount of lithium nitrate according to the atomic ratio Li / Ti=0.8-1.3, join in the mixed solution of ethanol and deionized water together with the titanium dioxide precursor of step (2) gained (the ratio of ethanol and deionized water The volume ratio is 1:2-3:1), magnetically stirred for 1-100 minutes, and then the obtained emulsion was transferred to a polytetrafluoroethylene-line...

Embodiment 2

[0045] (1) Add metal titanium powder to 7mol / L sodium hydroxide solution, wherein the amount of metal titanium powder added is 0.2g / L, stir magnetically for 1-60 minutes, and then transfer the mixed solution into polytetrafluoroethylene Lined stainless steel reaction kettle, sealed and placed in an oven, hydrothermal reaction at 100-220°C for 1-36 hours.

[0046] (2) After the reaction, cool to room temperature, centrifuge the obtained precipitate, wash until the pH value is 7.0, and then dry the precipitate in an oven at 70-90° C. to obtain a titanium dioxide precursor.

[0047] (3) Take a certain amount of lithium acetate according to the atomic ratio Li / Ti=0.8-1.2, join in the mixed solution of ethanol and deionized water together with the titanium dioxide precursor of step (2) gained (the ratio of ethanol and deionized water The volume ratio is 1:3-3:1), magnetically stirred for 5-100 minutes, and then the obtained emulsion was transferred to a polytetrafluoroethylene-line...

Embodiment 3

[0051] (1) Add metal titanium powder to 5mol / L sodium hydroxide solution, wherein the amount of metal titanium powder added is 0.2g / L, stir magnetically for 5-60 minutes, and then transfer the mixed solution into polytetrafluoroethylene Lined stainless steel reaction kettle, sealed and placed in an oven, hydrothermal reaction at 100-200°C for 1-30 hours.

[0052] (2) After the reaction, cool to room temperature, centrifuge the obtained precipitate, wash until the pH value is 7.0, and then dry the precipitate in an oven at 70-85°C to obtain a titanium dioxide precursor.

[0053] (3) Take a certain amount of lithium hydroxide by weighing according to the atomic ratio Li / Ti=0.8-1.1, and join in the mixed solution of ethanol and deionized water together with the titanium dioxide precursor obtained in step (2) (ethanol and deionized water The volume ratio is 1:3-2:1), magnetically stirred for 5-80 minutes, and then the obtained emulsion was transferred to a polytetrafluoroethylene-...

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Abstract

The present invention discloses a sea urchin-like lithium titanate microsphere preparation method, which comprises: adding metal titanium powder to a sodium hydroxide solution, stirring, carrying out a hydrothermal reaction at a temperature of 80-260 DEG C, carrying out centrifugation separation on the obtained precipitate, drying the precipitate to obtain a titanium dioxide precursor, adding a lithium salt and the titanium dioxide precursor to an ethanol and deionized water mixed solution, stirring to obtain an emulsion, carrying out a hydrothermal reaction, carrying out centrifugation separation on the obtained precipitate, drying to obtain white powder, carrying out a calcining heat treatment at a temperature of 300-1000 DEG C, and cooling to a room temperature to obtain the sea urchin-like lithium titanate microsphere. The method of the present invention has the following beneficial effects that: the sea urchin-like lithium titanate microsphere having the micro-nano grading structure is provided, and has characteristics of high discharge specific capacity and excellent rate cycle performance.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a preparation method of sea urchin-shaped lithium titanate microspheres. Background technique [0002] With the development of economy, people pay more and more attention to the crisis of energy and environment, and new energy has become the focus of everyone's research. One of the key technologies for the development of new energy is energy storage and conversion. Lithium-ion batteries are considered to be the most ideal tools for energy storage and conversion due to their high operating voltage, high energy density, and long service life. Battery materials are at the heart of lithium-ion batteries. Therefore, the key to obtaining high-performance lithium-ion batteries is to develop battery materials with excellent performance. [0003] Compared with commercial graphite anodes, spinel lithium titanate has a flat and relatively high lithium intercalation potential (...

Claims

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Application Information

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IPC IPC(8): H01M4/485C01G23/00B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 刘光印郑少龙郭琳娜张瑞雪毛武涛张亚杰郭琳
Owner NANYANG NORMAL UNIV
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