Preparation method of copper oxide nanowires and application of copper oxide nanowires in negative electrode of lithium ion battery

A technology of copper oxide nanowires and copper oxide, applied in copper oxide/copper hydroxide, battery electrodes, nanotechnology, etc., can solve the problems of low operability, complicated production process, and difficult industrialization, and achieve simple and easy process flow Lines, good rate performance, easy effect on diameter and length

Inactive Publication Date: 2014-01-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has complex production process, low operability, and is not easy to be industrialized

Method used

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  • Preparation method of copper oxide nanowires and application of copper oxide nanowires in negative electrode of lithium ion battery
  • Preparation method of copper oxide nanowires and application of copper oxide nanowires in negative electrode of lithium ion battery
  • Preparation method of copper oxide nanowires and application of copper oxide nanowires in negative electrode of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0018] First, soak the copper foil (99.99% pure, 1mm thick) in 1mol / L dilute hydrochloric acid solution for 4 hours to remove surface oxides and impurities. Rinse repeatedly with deionized water until the washing solution is neutral. Then the dried copper foil was put into a muffle furnace, air was continuously introduced, and the temperature was raised to 600°C at a heating rate of 3°C / min, and the holding time was 3, 6, 9, and 12 hours respectively.

[0019] Weigh 0.055g of copper oxide nanowires, 0.03g of acetylene black, and 0.015g of binder according to a mass ratio of 55:30:15. After mixing evenly, the electrode material is prepared.

[0020] as attached figure 1 As shown by the scanning electron microscope, the basic morphology of the copper oxide nanowires generated by thermal oxidation is to grow perpendicular to the copper base, forming a one-dimensional nanowire with a thick bottom and a sharp top. The diameter is 100-130nm and the length is 26-30μm. as attached...

example 2

[0022] The preparation method of copper oxide nanowires is the same as Example 1, except that the dried copper foil is put into a muffle furnace, air is continuously introduced, and the temperature is raised to 500° C. at a heating rate of 3° C. / min, and the holding time is 3, 6, 9, 12 hours.

[0023] The obtained nanowires have a length of 22-26 μm and a diameter of 130-170 nm. The electrochemical performance test results show that when the current density is 50mA / g, the specific capacities are 175mAh / g, 298mAh / g, 314mAh / g, and 310mAh / g at different oxidation times.

example 3

[0025] The preparation method of copper oxide nanowires is the same as Example 1, except that the dried copper foil is put into a muffle furnace, air is continuously introduced, and the temperature is raised to 400° C. at a heating rate of 3° C. / min, and the holding time is 3, 6, 9, 12 hours.

[0026] The obtained nanowires have a length of 15-22 μm and a diameter of 170-200 nm, respectively. The electrochemical performance test results show that when the current density is 50mA / g, the specific capacities are 124mAh / g, 275mAh / g, 309mAh / g, and 252mAh / g at different oxidation times.

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Abstract

A mixture of copper oxide nanowires and cuprous oxide is firstly prepared by a thermal oxidation method, then concentrated ammonia is utilized for post-processing the mixture, and pure one-dimensional copper oxide nanowires are obtained. When the one-dimensional copper oxide nanowires are used as a negative electrode material of a lithium ion battery, under a current density of 50 mA/g, the stable specific capacity of the electrode material is up to 550 mAh/g and is 1.5 times as much as that of a commercial carbon electrode. When the current density is gradually increased from 50 mA/g to 1 A/g and then returns to 50 mA/g, the capacity retention rate is 99%. The electrode material has excellent cycling stability and rate performance.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a copper oxide nanowire negative electrode material and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly due to their advantages such as high specific capacity, good cycle stability, no memory effect, and environmental protection. With the improvement of people's demand for energy, in recent years, with the development of electric vehicles and mobile electronic products, higher requirements have been put forward for the specific capacity and rate performance of lithium-ion batteries. As far as lithium-ion battery anode materials are concerned, most of the commercialized materials are carbon materials, including the following three categories: graphite and graphitized carbon materials, non-graphitized soft carbon, and hard carbon. Graphite material is cheap and has a lot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/02B82Y40/00H01M4/48
CPCY02E60/12Y02E60/10
Inventor 宋怀河万文博陈晓红
Owner BEIJING UNIV OF CHEM TECH
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