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Cathode material of battery with high rate performance and preparation method thereof

A battery negative electrode and high-rate technology, applied in the field of electrochemical energy, can solve the problems of low conductivity, limited application, and limited high-rate performance, etc., and achieve simple preparation process, expanded production scale, excellent high-rate performance and cycle performance. Effect

Inactive Publication Date: 2010-08-04
JIANGSU TENGFANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the extremely low electrical conductivity of Li4Ti5O12 (<10-13S / cm), this limits the large rate performance of this material to a certain extent.
At the same time, it also limits the application of this material in high-power lithium-ion batteries and hybrid supercapacitors.

Method used

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  • Cathode material of battery with high rate performance and preparation method thereof
  • Cathode material of battery with high rate performance and preparation method thereof
  • Cathode material of battery with high rate performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First weigh tetrabutyl titanate and lithium acetate according to the molar ratio of lithium (Li): titanium (Ti) 4.2:5 and put them into a flask, add absolute ethanol and stir to mix evenly, then mix the two solutions together, Stir magnetically evenly and add distilled water and glacial acetic acid slowly. After stirring for 30 minutes, add conductive carbon black with a carbon content of 10%. Continue stirring until it becomes a colloid. After aging for 10-20 hours, place it in an oven at 85°C for 10 hours. . The dried solid powder is milled with a ball mill for 3 hours, taken out and placed in a tube furnace for calcination in N2 gas, the N2 gas flow is controlled at 24L / h, the heating rate is 15°C / min, the calcination temperature is 850°C, and the calcination time for 3 hours, and then naturally cooled to room temperature to obtain a Li4Ti5O12 / C composite.

[0021] Combine the synthesized Li4Ti5O12 / C composite with conductive agent SuperP-Li produced by TIMCAL manuf...

Embodiment example 2

[0024] First weigh tetrabutyl titanate and lithium acetate according to the ratio of Li:Ti molar ratio of 4.2:5 and put them into a flask, add absolute ethanol and stir to mix evenly, then mix the two solutions together, magnetically stir evenly and add slowly Distilled water and glacial acetic acid, after stirring for 30 minutes, add conductive carbon black with a carbon content of 15%, continue to stir until it becomes a colloid, age for 10-20 hours, and then place it in an oven at 85°C for 10 hours. The dried solid powder is milled with a ball mill for 3 hours, taken out and placed in a tube furnace for calcination in N2 gas, the N2 gas flow is controlled at 24L / h, the heating rate is 15°C / min, the calcination temperature is 850°C, and the calcination time for 3 hours, and then naturally cooled to room temperature to obtain a Li4Ti5O12 / C composite.

[0025] The preparation of the pole piece, the assembly of the experimental battery and the electrochemical performance test a...

Embodiment example 3

[0027] First weigh tetrabutyl titanate and lithium acetate according to the ratio of Li:Ti molar ratio of 4:5 and put them into a flask, add absolute ethanol and stir to mix evenly, then mix the two solutions together, magnetically stir evenly and add slowly Distilled water and glacial acetic acid, after stirring for 30 minutes, add conductive carbon black with a carbon content of 5%, continue to stir until it becomes a colloid, age for 10-20 hours, and then dry in an oven at 85°C for 10 hours. The dried solid powder is milled with a ball mill for 3 hours, taken out and placed in a tube furnace for calcination in N2 gas, the N2 gas flow is controlled at 24L / h, the heating rate is 15°C / min, the calcination temperature is 850°C, and the calcination time for 3 hours, and then naturally cooled to room temperature to obtain a Li4Ti5O12 / C composite.

[0028] The preparation of the pole piece, the assembly of the experimental battery and the electrochemical performance test are the s...

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Abstract

The invention relates to a preparation method of a spinel lithium titanate / carbon composite material as an electrode material of a novel accumulator and a cathode material of a supercapacitor or lithium ion battery accumulator. A lithium titanate / carbon nanometer composite material is prepared by using inorganic lithium salt and tetrabutyl titanate as materials, and conductive carbon black as a carbon source and a reaction precursor and adopting a sol-gel method. The lithium titanate / carbon composite material prepared by using the method has small particles and evenly distributed granularity and presents excellent high rate performance and cycle performance when used as cathodes of supercapacitors and lithium ion batteries, thereby having wide application potential in high-powered hybrid supercapacitors and lithium ion batteries.

Description

technical field [0001] The invention relates to the field of electrochemical energy, in particular to a lithium titanate / carbon nanocomposite, a high-rate performance battery negative electrode material, and a preparation method thereof. Background technique [0002] The development of modern civilization and the continuous increase of the world's population have increased the world's demand for energy. With the increasing shortage of traditional primary energy supplies such as coal and oil, and the increasing problems of global warming and ecological environment deterioration caused by fuel energy, energy issues have received more and more attention. Exploring clean and renewable new energy has become one of the important tasks in today's scientific world, and has become a major issue related to the future living conditions of human beings. Among them, supercapacitors and lithium-ion batteries have attracted widespread attention due to their excellent performance. Since i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01G9/058C01G23/00C01B31/02H01G11/50H01G11/86
CPCY02E60/12Y02E60/122Y02E60/13Y02E60/10
Inventor 高立军杨陆香
Owner JIANGSU TENGFANG NEW ENERGY TECH
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