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Lithium titanate composite material and preparation method thereof

A composite material, lithium titanate technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor electronic conductivity, large polarization specific capacity attenuation, etc., to improve electrical conductivity, improve material electronic and ionic conductivity , Improve the effect of reversible capacity

Active Publication Date: 2017-01-18
石家庄昭文新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium titanate has many outstanding characteristics as the negative electrode material of lithium-ion batteries, lithium titanate also has its shortcomings, such as the low voltage of the battery due to high potential, and its inherent conductivity is only 10. -9 S / cm, poor electronic conductivity, large current discharge is easy to produce large polarization and fast specific capacity decay, which limits the rate performance of this material to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A lithium titanate composite material, the preparation method of which is: (1) use hydrogen peroxide and oxalic acid to form a composite detergent with a mass ratio of 1:2, and the mass concentration of the composite detergent solution is 35%, and the nano-silver oxide and the composite detergent Soak nano-silver oxide in the solution with a mass ratio of 1:2 for 3 hours, filter and wash with water, and then dry at 100°C to obtain high-purity nano-silver oxide with a particle size of 10-25nm;

[0025] (2) The lithium source and titanium source compounds are mixed according to the material ratio Li:Ti=1.0:1, and absolute ethanol is used as a solvent to prepare lithium source solutions with a concentration of 0.1mol / L and a concentration of 2mol / L Titanium source solution, weigh the chelating agent of 1% of the total mass of lithium source and titanium source, under the action of ultrasound, mix the lithium source solution and titanium source solution, then slowly add the ...

Embodiment 2

[0031] A lithium titanate composite material, the preparation method of which is: (1) use hydrogen peroxide and oxalic acid in a mass ratio of 1:3 to form a composite detergent, the mass concentration of the composite detergent solution is 15%, and the nano-silver oxide and the composite detergent After soaking nano-silver oxide in the solution with a mass ratio of 1:4 for 1 hour, filter and wash with clear water, then dry at 120°C to obtain high-purity nano-silver oxide with a particle size of 10-25nm;

[0032] (2) The lithium source and titanium source compounds are mixed according to the material ratio Li:Ti=0.8:1, and absolute ethanol is used as a solvent to prepare lithium source solutions with a concentration of 2mol / L and a concentration of 0.1mol / L Titanium source solution, weigh the chelating agent of 8% of the total mass of the lithium source and the titanium source, under the action of ultrasound, mix the lithium source solution and the titanium source solution, then...

Embodiment 3

[0038] A lithium titanate composite material, the preparation method of which is as follows: (1) Composite detergent is composed of hydrogen peroxide and oxalic acid at a mass ratio of 1:3, the mass concentration of the composite detergent solution is 25%, and nano-silver oxide and composite detergent Soak nano-silver oxide in the solution with a mass ratio of 1:3 for 2 hours, filter and wash with water, and then dry at 110°C to obtain high-purity nano-silver oxide with a particle size of 10-25nm;

[0039] (2) The lithium source and titanium source compounds are mixed according to the material ratio Li:Ti=0.9:1, and absolute ethanol is used as a solvent to prepare a lithium source solution with a concentration of 1.5mol / L, and a concentration of 1.5mol / L L titanium source solution, weigh the chelating agent of 6% of the total mass of the lithium source and the titanium source, under the action of ultrasound, mix the lithium source solution and the titanium source solution, then...

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Abstract

The invention belongs to the technical field of battery materials and concretely relates to a lithium titanate composite material and a preparation method thereof. The composite material is prepared by titanium source and lithium source synthesis and nanometer silver oxide and petroleum coke compound modification. The obtained material has high discharge capacity under low-magnification, high-magnification and low-temperature and high-magnification, and the material has excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium titanate composite material and a preparation method thereof. Background technique [0002] Lithium-ion battery is considered as an ideal energy storage system due to its high specific energy, long cycle life, no memory effect, low pollution and low self-discharge rate. However, with the improvement of production and living standards, higher requirements are placed on the performance of lithium-ion batteries. The traditional carbon negative electrode materials have been insufficient in terms of high rate and high safety. First, the potential of the carbon negative electrode is very close to that of lithium. Lithium dendrites are formed; secondly, due to the layered structure of the graphite negative electrode, the lithium ion intercalation and intercalation process easily causes a large deformation (10.3%), resulting in insufficient cycle performa...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCH01M4/485Y02E60/10
Inventor 陶静静
Owner 石家庄昭文新能源科技有限公司