Preparation method of composite lithium titanate material

A technology of compounding lithium titanate and slurry, which is applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of doping, reducing discharge capacity and first charge and discharge efficiency, and achieves simple process flow and good battery life. Chemical properties, low-cost effects

Active Publication Date: 2015-04-15
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these related technologies have not achieved the effect of both doping and coating at one time, and although these methods have improved cycle life and rate characteristics, they have also reduced discharge capacity and initial charge-discharge efficiency.

Method used

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  • Preparation method of composite lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse 2mol of lithium carbonate, 4.9mol of anatase titanium dioxide and 0.1mol of tetra-n-propyl zirconate (zirconate coupling agent) in ethanol, the ratio of solid to organic solvent is 1:1.5, on a planetary ball mill Grind and disperse for 5 hours to prepare the lithium titanate precursor mixture, dry it in a vacuum oven at 100°C, grind and crush the precursor fine powder uniformly, put the dispersed powder into a crucible, and place it in a nitrogen atmosphere to protect the high temperature furnace In the process, the temperature was raised to 700 ° C, and after 12 hours of heat preservation, it was naturally cooled to room temperature, taken out, crushed and sieved to obtain the composite lithium titanate material Li 4 Zr 0.1 Ti 4.9 o 12 / C y (0≤y≤0.05).

Embodiment 2

[0027] Disperse 4.2mol lithium nitrate, 5mol rutile titanium dioxide and 0.05mol chromium chloride methacrylate (chromium complex coupling agent) in ethanol, the ratio of solid to organic solvent is 1:2, and grind on a planetary ball mill Disperse for 10 hours to prepare the lithium titanate precursor mixture, dry it at 120°C, grind and crush it to obtain a uniformly dispersed precursor fine powder, put the dispersed powder into a crucible, and place it in a nitrogen mixed with 10% hydrogen atmosphere to protect the high temperature furnace In the process, the temperature was raised to 950 ° C, and after 10 hours of heat preservation, it was naturally cooled to room temperature, taken out, crushed and sieved to obtain the composite lithium titanate material Li 4 Gr 0.05 Ti 4.95 o 12 / C y (0≤y≤0.05).

Embodiment 3

[0029] Disperse 4 mol of lithium hydroxide, 5 mol of anatase titanium dioxide and 0.1 mol of methacryloxy functional zirconium aluminate (aluminum zirconate coupling agent) in acetone, the ratio of solid to organic solvent is 1:1.7, in the planet Grinding and dispersing on a type ball mill for 10 hours to prepare a lithium titanate precursor mixture, drying it in a vacuum oven at 100°C, grinding and crushing to obtain a uniformly dispersed precursor fine powder, and putting the dispersed powder into a crucible and placing it in a nitrogen atmosphere In a protected high-temperature furnace, raise the temperature to 600°C, keep it warm for 5 hours, cool it naturally to room temperature, take it out, crush it, and sieve it, then heat it up to 900°C, keep it warm for 10 hours, cool it down to room temperature naturally, take it out, crush it, and sieve it After separation, the composite lithium titanate material Li 4 m 0.1 Ti 4.9 o 12 / C y (M=Al, Zr; 0≤y≤0.05).

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Abstract

The invention discloses a preparation method of a composite lithium titanate material, and specifically discloses a preparation method of a negative electrode material of a lithium ion battery, wherein the negative electrode material is zirconium-doped and carbon-coated lithium titanate. The doping and coating can be performed in one step through adding a modifying additive, and the preparation method is simple and can be easily applied to industrial production. The obtained composite lithium titanate material is an excellent material for producing telephone lines.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing lithium titanate, a negative electrode material for lithium ion secondary batteries, in particular to a preparation of lithium titanate, a negative electrode material for lithium ion batteries doped with metal elements and coated with carbon method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high operating voltage, and no memory effect, and are expected to become one of the main power sources for electric vehicles. Since the potential of graphite to lithium is only about 0.2V, it is easy to cause the precipitation of lithium on its surface, causing safety problems. Lithium titanate has a "zero strain" characteristic in which the skeleton structure hardly changes during charging and discharging, and has a high lithium intercalation potential (1.55 V vs. Li / Li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/366H01M4/485H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 冯海兰龚金保
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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