Hollow spherical LiTiO2 material and preparation method thereof

A spherical, hollow technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of negative impact on electrochemical performance, difficult control of powder morphology, harsh reaction conditions, etc., to achieve environmentally friendly, good Electrochemical performance, effect of moderate conditions

Active Publication Date: 2015-03-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two methods must be realized through high temperature. On the one hand, high temperature will cause a sharp increase in cost in the industrialization process, and higher temperature sintering also has certain requirements for equipment, and the reaction conditions are relatively harsh, so it is difficult to realize; On the one hand, the morphology of the powder prepared by high-temperature sintering is not easy to control, which has a certain negative impact on its electrochemical performance.

Method used

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  • Hollow spherical LiTiO2 material and preparation method thereof
  • Hollow spherical LiTiO2 material and preparation method thereof
  • Hollow spherical LiTiO2 material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A hollow spherical LiTiO 2 The preparation method of material comprises the following steps:

[0029] (1) Prepare 30 ml of lithium oxalate solution with a concentration of 2.2 moles per liter, add titanium dioxide so that the molar ratio of lithium to titanium is 5:1, and stir the mixed solution at 40°C for 60 minutes to obtain a microwave hydrothermal reaction precursor liquid;

[0030] (2) Transfer the above mixed solution to a polytetrafluoroethylene-lined microwave hydrothermal reaction kettle, microwave hydrothermal reaction for 60 minutes under the conditions of 600 watts and 160 ° C, and the filling ratio of the microwave hydrothermal reaction kettle is 50% ;

[0031] (3) Cool to room temperature after the reaction, and then centrifuge to separate the precipitate, which is washed with deionized water and absolute ethanol respectively. The precipitate was dried at 60 °C for 1 h to obtain hollow spherical LiTiO 2 Material.

[0032] The hollow spherical LiTiO o...

Embodiment 2

[0035] A hollow spherical LiTiO 2 The preparation method of material comprises the following steps:

[0036] (1) Prepare 40 ml of lithium hydroxide solution with a concentration of 2.0 moles per liter, add isopropyl titanate so that the molar ratio of lithium to titanium is 10:1, stir the mixed solution at 60°C for 80 minutes with magnetic force, and obtain Microwave hydrothermal reaction precursor;

[0037] (2) Transfer the above mixed solution to a polytetrafluoroethylene-lined microwave hydrothermal reaction kettle, and microwave hydrothermal reaction under the conditions of 800 watts and 140°C for 70 minutes, and the filling ratio of the microwave hydrothermal reaction kettle is 60%. ;

[0038] (3) Cool to room temperature after the reaction, and then centrifuge to separate the precipitate, which is washed with deionized water and absolute ethanol respectively. The precipitate was dried at 70 °C for 1 h to obtain hollow spherical LiTiO 2 Material.

[0039] The hollow ...

Embodiment 3

[0041] A hollow spherical LiTiO 2 The preparation method of material comprises the following steps:

[0042](1) Prepare 50 ml of lithium nitrate solution with a concentration of 1.8 moles per liter, add isopropyl titanate so that the molar ratio of lithium to titanium is 10:1, stir the mixed solution magnetically at 70°C for 40 minutes to obtain microwave Hydrothermal reaction precursor;

[0043] (2) Transfer the above mixed solution to a polytetrafluoroethylene-lined microwave hydrothermal reaction kettle, microwave hydrothermal reaction for 40 minutes under the conditions of 400 watts and 1680 ° C, and the filling ratio of the microwave hydrothermal reaction kettle is 30% ;

[0044] (3) Cool to room temperature after the reaction, and then centrifuge to separate the precipitate, which is washed with deionized water and absolute ethanol respectively. The precipitate was dried at 80 °C for 3 h to obtain hollow spherical LiTiO 2 Material.

[0045] The hollow spherical LiTi...

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Abstract

The invention discloses a hollow spherical LiTiO2 material and a preparation method thereof, belonging to the technical field of battery electrode materials. The preparation method comprises the following steps: (1) selecting a lithium source, preparing the lithium source into a lithium-containing solution with concentration of 1.5-2.5mol / L, adding a titanium source in the lithium-containing solution, uniformly mixing to obtain a mixed solution, fully and uniformly mixing the mixed solution at temperature of 20-100 DEG C to obtain a reaction precursor solution; (2) performing hydrothermal reaction on the reaction precursor solution at temperature of 120-200 DEG C and then cooling to room temperature, and then centrifugally collecting a precipitate; and (3), cleaning the precipitate and then drying to prepare the hollow spherical LiTiO2 material. The hollow spherical LiTiO2 material is prepared by adopting a microwave hydrothermal process; the preparation method effectively combines advantages of a hydrothermal process and a microwave technology, and can be used for preparing an electrode material which is high in product purity and uniform in size within a short time; the shape of the electrode material is easily controlled. The microwave hydrothermal process is simple in procedure, moderate in conditions, free from special process equipment, and environmental-friendly; the industrialized production is easily realized.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials and relates to a LiTiO 2 Material and preparation method thereof, in particular to a kind of hollow spherical LiTiO 2 Materials and their preparation methods. Background technique [0002] Lithium-ion batteries have a series of outstanding advantages such as high working voltage, high specific capacity, no memory effect, long cycle life, and environmental friendliness, and have become the preferred power source in various fields. At present, the lithium ion negative electrode material used in commercialization is graphite electrode, which has certain safety hazards, which limits its application. [0003] Rock-salt-type Li-Ti-O compounds have attracted widespread attention due to their high plateau voltage, good cycle stability, cheap price and easy preparation, among which the most studied one is TiO 2 , Li 4 Ti 5 o 12 and LiTi 2 o 4 , but for LiTiO 2 less research. R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/1391H01M4/485H01M10/0525Y02E60/10
Inventor 曹丽云惠亚妮黄剑锋欧阳海波许占位李嘉胤张婉卓李翠艳
Owner SHAANXI UNIV OF SCI & TECH
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