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Method for preparing lithium cobalt oxide nanosheets

A nanosheet, lithium cobalt oxide technology, applied in nanotechnology, chemical instruments and methods, cobalt compounds, etc., can solve the problems of lithium ion insertion and migration difficulties, affecting electrical properties, and large particle size of lithium cobalt oxide.

Active Publication Date: 2012-10-24
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods usually require heat treatment at high temperature, which causes the particle size of the obtained lithium cobalt oxide to be relatively large and irregular in size.
Larger particle size will cause difficulty in intercalation and migration of lithium ions, which will affect the capacity of lithium batteries
Existing hydrothermal technology can achieve small particle size distribution and small size of particles to a certain extent, but nanoscale particles are easy to aggregate and difficult to form a stable self-supporting structure, which affects its electrical properties

Method used

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  • Method for preparing lithium cobalt oxide nanosheets
  • Method for preparing lithium cobalt oxide nanosheets
  • Method for preparing lithium cobalt oxide nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Take Co (Ac) 2 4H 2 O 1.4g and 16mL of 5M NaOH solution were mixed, placed in a 20mL hydrothermal kettle, sealed and placed in an oven at 170°C for 5 hours. After taking out the hydrothermal kettle and cooling naturally in the air to room temperature, a dark blue cobalt-containing solution was obtained.

[0015] 2) After taking out the dark blue solution, centrifuge to remove the black precipitate in the lower layer, then add 0.1g LiCl, add the mixed solution into a 20mL hydrothermal kettle, seal the hydrothermal kettle tightly and place it in an oven at 150°C for 10h. After taking out the hydrothermal kettle, it was naturally cooled to room temperature in the air, and the black precipitate was repeatedly washed with deionized water and absolute ethanol, and dried at room temperature to obtain flaky LiCoO 2 nanomaterials.

[0016] 3) Assemble the obtained lithium cobalt oxide into a 2025-type button battery, and charge and discharge at 5mA.h.g -1 The rate is test...

Embodiment 2

[0018] 1) Take CoSO 4 .7H 2 O 1.4g and 15mL of 10M NaOH solution were mixed, placed in a 20mL hydrothermal kettle, sealed and placed in an oven at 190°C for 8 hours. After taking out the hydrothermal kettle and cooling naturally in the air to room temperature, a dark blue cobalt-containing solution was obtained.

[0019] 2) After taking out the dark blue solution, centrifuge to remove the black precipitate in the lower layer, then add 0.2g LiCl, put the mixed solution into a 20mL hydrothermal kettle, seal the hydrothermal kettle tightly and place it in an oven at 180°C for 8 hours. After taking out the hydrothermal kettle, it was naturally cooled to room temperature in the air, and the black precipitate was repeatedly washed with deionized water and absolute ethanol, and dried at room temperature to obtain flaky LiCoO 2 nanomaterials.

[0020] 3) Assemble the obtained lithium cobalt oxide into a 2025-type button battery, and charge and discharge at 5mA.g -1 The rate is tes...

Embodiment 3

[0022] 1) Take CoCl 2 .6H 2 O 0.5g and 15mL of 16M NaOH solution were mixed, placed in a 20mL hydrothermal kettle, sealed and heated in an oven at 200°C for 10h. After taking out the hydrothermal kettle and cooling naturally in the air to room temperature, a dark blue cobalt-containing solution was obtained.

[0023] 2) After taking out the dark blue solution, centrifuge to remove the lower black precipitate, then add 0.2g Li 2 SO 4 .H 2 O, add the mixed solution into a 20mL hydrothermal kettle, seal the hydrothermal kettle tightly and place it in an oven at 230°C for 5h. After taking out the hydrothermal kettle, it was naturally cooled to room temperature in the air, and the black precipitate was repeatedly washed with deionized water and absolute ethanol, and dried at room temperature to obtain flaky LiCoO 2 nanomaterials.

[0024] 3) Assemble the obtained lithium cobalt oxide into a 2025-type button battery, and charge and discharge at 5mA.h.g -1 The rate is tested, ...

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Abstract

The invention discloses a method for preparing lithium cobalt oxide nanosheets. The method includes steps of mixing cobalt salt and strong alkali, heating and centrifuging to obtain dark-blue liquid containing cobalt, and performing heat reaction between the dark-blue liquid containing cobalt and lithium brine so as to obtain the lithium cobalt oxide nanosheets with self-support structures. The method is simple and easy to operate and has a potential industrialization prospect. Products prepared by the method are high in charge and discharge capacity.

Description

technical field [0001] The invention relates to a method for preparing an energy material, in particular to a method for preparing a lithium cobalt oxide nanosheet with a self-supporting structure. Background technique [0002] With the development of industrial society, traditional energy sources such as coal, oil, and natural gas are decreasing day by day, and with the widespread adoption of portable electronic devices (such as mobile phones, etc.) brought about by technological progress, and the demand for high-energy batteries, people's The pursuit of batteries with high energy density, long cycle life, and high performance-price ratio is becoming increasingly intense. At present, secondary batteries mainly include: lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries, especially lithium cobalt oxide, are a new type of high-energy rechargeable battery that was commercialized in 1992. It has good a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/00B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 李冬松林璋王娴黄丰
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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