Lithium-ion battery cathode material with long service life and high power as well as preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemical energy, can solve the problems of limiting material performance at large rates, low conductivity, and limited applications, achieving excellent high rate performance and cycle performance, simple preparation process, and expanded production effect of scale

Inactive Publication Date: 2010-10-20
CSI CELLS CO LTD
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AI Technical Summary

Problems solved by technology

[0004] But since Li 4 Ti 5 o 12 The conductivity of the material is extremely low (<10-13S / cm), which limits the performance of the 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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  • Lithium-ion battery cathode material with long service life and high power as well as preparation method thereof
  • Lithium-ion battery cathode material with long service life and high power as well as preparation method thereof
  • Lithium-ion battery cathode material with long service life and high power as well as preparation method thereof

Examples

Experimental program
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Effect test

Embodiment example 2

[0023] 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.

[0024] The preparation of the pole piece, the assembly of the experimental battery and the electrochemical performance test a...

Embodiment example 3

[0026] 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 to 20 hours, and then place it in an oven at 85°C for 10 hours to dry. 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.

[0027] The preparation of the pole piece, the assembly of the experimental battery and the electrochemical performance...

Embodiment example 4

[0029]First weigh tetrabutyl titanate and lithium acetate according to the ratio of Li:Ti molar ratio of 4.5:5 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 20%, 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 to dry. 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.

[0030] The preparation of the pole piece, the assembly of the experimental battery and the electrochemical performance ...

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Abstract

The invention relates to a novel energy storage device and a preparation method of a spinel lithium titanate/carbon composite material of a lithium-ion battery cathode material with long service life and high power. The lithium titanate/carbon composite material is prepared by adopting a sol-gel method and taking inorganic lithium salts and tetrabutyl titanate as materials and carbon black as a carbon source. The prepared lithium titanate/carbon composite material has small particles and even particle size distribution and shows excellent large-rate capability and cycling performance as the cathode of a lithium-ion battery with long service life and high power. When the lithium titanate/carbon composite material and metallic lithium form a half-cell, the first specific capacity of the half-cell can still reach 108.9mAh/g in the 60C discharging process, and the capacity retention ratio of the half-cell after 2000 cycles is 75.9 percent. When the lithium titanate/carbon composite material and spinel lithium manganite form the lithium-ion battery and the current density reaches 1A/g (about 60C multiplying power), the discharge capacity can still reach 85 percent of discharge capacity when the current density reaches 60mA/g. Therefore, the invention has wide application potential in the lithium-ion battery with long service life and high power.

Description

technical field [0001] The invention relates to the field of electrochemical energy, in particular to a lithium titanate / carbon nanocomposite used as a negative electrode material for a long-life high-power lithium-ion battery 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 excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122Y02E60/10
Inventor 高立军
Owner CSI CELLS CO LTD
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