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Preparation method for novel lithium titanate material

A lithium titanate, a new type of technology, applied in the field of preparation of new lithium titanate materials, can solve the problems of poor ion transmission and low electronic conductivity, and achieve high specific energy, large specific surface area, and good rate performance.

Inactive Publication Date: 2017-03-22
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a preparation method of a novel lithium titanate material, and the lithium titanate material prepared by the method solves the problems of poor ion transmission and low electronic conductivity in the prior art

Method used

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  • Preparation method for novel lithium titanate material
  • Preparation method for novel lithium titanate material
  • Preparation method for novel lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) First add tetrabutyl titanate and lithium nitrate into methanol according to the molar ratio of 4:5, the concentration of tetrabutyl titanate in methanol is 0.19mol / L, stir in vacuum for 7h to mix evenly (vacuum pressure is - 0.08Mpa), and then add distilled water with the same volume as methanol to make a milky white gel;

[0031] (2) Put the gel into the reaction kettle to evacuate (vacuum pressure is -0.08Mpa), carry out organic solvent-hydrothermal reaction, the reaction temperature is 150°C, the reaction time is 25h, the product is washed 4 times with methanol, and then Vacuum dry at 72°C for 3.5h (vacuum pressure is -0.08Mpa) to obtain the precursor;

[0032] (3) The precursor was then sintered at 610 °C for 1.3 h under the protection of argon to obtain flake Li 4 Ti 5 o 12 Material (99.1% pure);

[0033] (4) The Li obtained in step (3) 4 Ti 5 o 12 The material was mixed with mesophase pitch (Li 4 Ti 5 o 12 The mass ratio of material to mesophase pit...

Embodiment 2

[0036] (1) First add tetrabutyl titanate and lithium nitrate into methanol according to the molar ratio of 4:4.9, the concentration of tetrabutyl titanate in methanol is 0.2mol / L, stir in vacuum for 7h to mix evenly (vacuum pressure is -0.09 Mpa), and then add distilled water (the volume ratio of distilled water to methanol is 1:0.95) to make a milky white gel;

[0037] (2) Put the gel into the reaction kettle to vacuum (vacuum pressure is -0.09Mpa), carry out organic solvent-hydrothermal reaction, the reaction temperature is 160°C, the reaction time is 20h, the product is washed with methanol for 3 times, and then Vacuum dry at 72°C for 3.5h (vacuum pressure is -0.09Mpa) to obtain the precursor;

[0038] (3) The precursor was then sintered at 580 °C for 1.5 h under the protection of argon to obtain flake Li 4 Ti 5 o 12 Material (98.6% pure);

[0039] (4) The Li obtained in step (3) 4 Ti 5 o 12 The material was mixed with glucose (Li 4 Ti 5 o 12 The mass ratio of mat...

Embodiment 3

[0042] (1) First add tetrabutyl titanate and lithium nitrate into methanol according to the molar ratio of 4:5.1, stir in vacuum for 7 hours to mix evenly (vacuum pressure is -0.08Mpa), and then add a certain amount of distilled water to make a milky white gel glue.

[0043] (2) Put the gel into the reactor to vacuumize (vacuum pressure is -0.08Mpa), carry out organic solvent-hydrothermal reaction, the reaction temperature is 150°C, the reaction time is 23h, the product is washed with methanol 4 times, and then Dry in vacuum at 72°C for 3.5h (vacuum pressure is -0.08Mpa) to obtain the precursor.

[0044] (3) The precursor was then sintered at 620 °C for 1.0 h under the protection of argon to obtain flake Li 4 Ti 5 o 12 Material (98.5% pure);

[0045] (4) The Li obtained in step (3) 4 Ti 5 o 12 Material mixes with sucrose (mass ratio is the same as embodiment 2), adds oxalic acid (oxalic acid is the same as Li 4 Ti 5 o 12 The material mass ratio is 1:100) and mixed even...

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Abstract

The invention relates to a preparation method for a novel lithium titanate material, and belongs to the technical field of a lithium battery material. The preparation method comprises the following steps of putting a titanium source and a lithium source into an organic solvent according to a certain molar mass, performing vacuum stirring for 6-7h and mixing uniformly; then adding a certain amount of distilling water to prepare into milk white gel; putting the gel into a reaction kettle and performing vacuumizing, and carrying out an organic solvent-hydrothermal reaction; performing washing, drying and annealing on the product to obtain sheet-shaped Li<4>Ti<5>O<12>; and next, performing coating processing on the sheet-shaped Li<4>Ti<5>O<12>, and sintering under argon protection at a temperature of 500-700 DEG C for 4-6h to finally obtain the carbon-coated sheet-shaped lithium titanate material. The lithium titanate material prepared by the preparation method has the advantages of relatively high specific energy, high rate capability and the like.

Description

technical field [0001] The invention relates to a preparation method of a novel lithium titanate material, which belongs to the technical field of lithium battery materials. Background technique [0002] Since the beginning of the 21st century, the population, resource and environmental problems faced by human beings have become more and more serious. Therefore, building a resource-saving and environment-friendly society has become the main body of today's era. In the field of energy, especially in the field of batteries, lithium-ion batteries are widely used in digital products, electric vehicles, and aerospace fields due to their advantages such as high energy density, no pollution, and long service life. [0003] At present, the anode materials of commercial lithium batteries are mainly carbon-based materials. Although the cost of carbon anode materials is low and the energy density is high, lithium batteries have certain safety performance due to the presence of lithium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/485H01M10/0525
CPCH01M4/366H01M4/485H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张敬捧贾传龙关成善
Owner SHANDONG GOLDENCELL ELECTRONICS TECH