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Preparation method of carbon-coated lithium titanate negative electrode material

A technology for carbon-coated lithium titanate and negative electrode materials, which is applied to battery electrodes, electrical components, electrochemical generators, etc. Cumbersome and other problems, to achieve the effect of being conducive to large-scale industrial production, eliminating the need for hydrothermal reactions, and reducing costs

Inactive Publication Date: 2020-09-15
SICHUAN PANOVASIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, to use a soluble polymer carbon source to carbon-coat lithium titanate materials, it is necessary to dissolve the soluble polymer carbon source in water first, then add titanium source and lithium source, mix them evenly by ball milling and other processes, and then use spray drying Obtaining lithium titanate precursor, this process is cumbersome, consumes a lot of energy, and the production cost is high; in addition, because the in-situ polymerization process generally needs to add an initiator, which greatly increases the cost, it is not suitable for large-scale synthesis. Therefore, through in-situ polymerization The process of introducing polymer carbon source in the same way is not suitable for industrial production of carbon-coated lithium titanate materials

Method used

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  • Preparation method of carbon-coated lithium titanate negative electrode material
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  • Preparation method of carbon-coated lithium titanate negative electrode material

Examples

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Embodiment 1

[0028] A method for preparing a carbon-coated lithium titanate negative electrode material provided by the invention comprises the following steps:

[0029] (1) Add 1000g of titanium dioxide nanoparticles into 2500mL of tannic acid aqueous solution with a concentration of 0.01mol / L, ultrasonically disperse for 30min, and stir at room temperature for 1h;

[0030] (2) vacuum filter the solution in step (1), and dry the filter cake in an oven at 100°C for 24 hours to obtain compound A;

[0031] (3) Compound A and 379g lithium carbonate are added into a high-speed mixer, the high-speed mixer spindle speed is 1000r / min, and the working time is 5min to obtain compound B;

[0032] (4) The composite B was placed in a tube furnace and calcined at 800° C. for 8 hours in an inert atmosphere to obtain a carbon-coated lithium titanate negative electrode material.

[0033] The battery performance test was carried out on the carbon-coated lithium titanate negative electrode material prepare...

Embodiment 2

[0035] A method for preparing a carbon-coated lithium titanate negative electrode material provided by the invention comprises the following steps:

[0036] (1) Add 1000g of titanium dioxide nanoparticles into 2500mL of 0.02mol / L tannic acid aqueous solution, ultrasonically disperse for 30min, and stir at room temperature for 2h;

[0037] (2) vacuum filter the solution in step (1), and dry the filter cake in an oven at 80°C for 40 hours to obtain compound A;

[0038] (3) Compound A and 250g lithium hydroxide were added into a high-speed mixer, the spindle speed of the high-speed mixer was 750r / min, and the working time was 8min to obtain compound B;

[0039] (4) The composite B was placed in a tube furnace and calcined at 850° C. for 7 hours in an inert atmosphere to obtain a carbon-coated lithium titanate negative electrode material.

[0040] The battery performance test was carried out on the carbon-coated lithium titanate negative electrode material prepared above. The spe...

Embodiment 3

[0042] A method for preparing a carbon-coated lithium titanate negative electrode material provided by the invention comprises the following steps:

[0043] (1) Add 1000g of titanium dioxide nanoparticles into 2500mL of 0.025mol / L tannic acid aqueous solution, ultrasonically disperse for 30min, and stir at room temperature for 3h;

[0044] (2) vacuum filter the solution in step (1), and dry the filter cake in an oven at 60°C for 48 hours to obtain compound A;

[0045] (3) Add compound A and 380g lithium carbonate together in the high-speed mixer, the high-speed mixer spindle speed is 1000r / min, and the working time is 6min to obtain compound B;

[0046] (4) The composite B was placed in a tube furnace and calcined at 800° C. for 12 hours in an inert atmosphere to obtain a carbon-coated lithium titanate negative electrode material.

[0047] The battery performance test was carried out on the carbon-coated lithium titanate negative electrode material prepared above. The specifi...

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Abstract

The invention discloses a preparation method of a carbon-coated lithium titanate negative electrode material. The method comprises: using tannic acid as a carbon source to modify titanium dioxide nanoparticles, and due to the chelation of tannic acid and titanium dioxide nanoparticles, tannic acid coating the surfaces of titanium dioxide nanoparticles through electrostatic interaction; and uniformly mixing the tannic acid modified titanium dioxide nanoparticles with a lithium source compound through a high-speed mixer, and carrying out high-temperature roasting in an inert atmosphere to finally obtain the carbon-coated lithium titanate negative electrode material. The method is characterized in that tannic acid is used for modifying titanium dioxide nanoparticles, and particle size controlof lithium titanate particles and uniform distribution of a surface carbon coating layer are realized at the same time. The coating process for preparing the carbon-coated lithium titanate material by adopting the method is simple, the raw material cost is low, the production energy consumption is low, and the obtained carbon-coated lithium titanate negative electrode material is relatively smallin particle size, high in specific capacity and good in cycling stability.

Description

technical field [0001] The invention belongs to the field of lithium ion battery electrode materials, and in particular relates to a preparation method of a carbon-coated lithium titanate negative electrode material. Background technique [0002] Due to the limitation of energy resources and the increasing environmental pollution, it is becoming more and more important to develop an environmentally friendly and sustainable energy to replace traditional energy. Among the various battery technologies developed so far, lithium-ion batteries are rapidly developing due to their ability to provide high energy and power densities. As a new type of chemical energy storage device, lithium-ion batteries have the advantages of long cycle life, high energy density, no memory effect, fast charging and discharging, etc., and have been widely used in mobile phones, notebook computers, power tools, electric vehicles, household small Electrical and other fields. [0003] Spinel lithium tit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 高剑周玉王鹏博王铭
Owner SICHUAN PANOVASIC TECH
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