Hollow porous tin dioxide-cuprous oxide-copper or hollow porous tin dioxide-copper integrated lithium battery negative electrode and preparation method thereof

A technology of tin dioxide and cuprous oxide, used in battery electrodes, lithium batteries, secondary batteries, etc., can solve problems such as poor electrical conductivity, capacity decay, and complex processes, and reduce the possibility of pulverization and peeling. , the effect of suppressing the increase in internal resistance and shortening the transmission time

Active Publication Date: 2021-08-27
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following deficiencies that need to be improved: (1) the preparation process of freeze-casting and gel-sol is adopted, the process is complex, the cost is high, and it is difficult to realize large-scale industrial production; (2) the prepared three-dimensional porous SnO 2 Since the pores of / Cu are large pores, they cannot release the residual stress caused by the volume change during the de-lithiation / intercalation process. During the cycle, they are prone to fracture, resulting in insufficient cycle stability; (3) SnO 2 Direct coating on 3D porous copper, SnO 2 The bonding force with copper is limited, and the electrical conductivity is not good enough, resulting in poor rate performance. Furthermore, SnO 2 Active materials are easy to agglomerate during charge and discharge, resulting in rapid capacity decay

Method used

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  • Hollow porous tin dioxide-cuprous oxide-copper or hollow porous tin dioxide-copper integrated lithium battery negative electrode and preparation method thereof
  • Hollow porous tin dioxide-cuprous oxide-copper or hollow porous tin dioxide-copper integrated lithium battery negative electrode and preparation method thereof
  • Hollow porous tin dioxide-cuprous oxide-copper or hollow porous tin dioxide-copper integrated lithium battery negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In this example, a method for preparing a hollow porous tin dioxide-cuprous oxide-copper integrated lithium battery negative electrode based on copper foam growth is provided, and the steps are as follows:

[0054] (1) Cut the foamed copper with micron-scale pores into square pieces with a side length of 6mm and press it thinly, then immerse in 1mol / L sulfuric acid solution, let it stand for 12h, remove the oxide layer on the surface of the foamed copper, and then use it successively Ionized water and ethanol were washed under ultrasonic vibration conditions, and vacuum-dried to obtain foamed copper with a thickness of about 1200 μm.

[0055] (2) Place the copper foam treated in step (1) in a tube furnace, raise the temperature to 400°C at a heating rate of 12°C / min in the air atmosphere, and keep it at this temperature for 6h, and the foam copper is partially oxidized into Copper oxide, during the oxidation process, copper oxide nanowires grow on the surface of the foa...

Embodiment 2

[0075] In this example, a method for preparing a hollow porous tin dioxide-cuprous oxide-copper integrated lithium battery negative electrode based on copper foam growth is provided, and the steps are as follows:

[0076] (1) Cut the foamed copper with micron-scale pores into square pieces with a side length of 6mm and press it thinly, then immerse in 1mol / L sulfuric acid solution, let it stand for 12h, remove the oxide layer on the surface of the foamed copper, and then use it successively Ionized water and ethanol were washed under ultrasonic vibration conditions, and vacuum-dried to obtain foamed copper with a thickness of about 2000 μm.

[0077] (2) Place the copper foam treated in step (1) in a tube furnace, raise the temperature to 420°C at a heating rate of 12°C / min in the air atmosphere, and keep it at this temperature for 6h, the foam copper is partially oxidized into Copper oxide, during the oxidation process, copper oxide nanowires grow on the surface of the foamed ...

Embodiment 3

[0085] In this example, a method for preparing a hollow porous tin dioxide-cuprous oxide-copper integrated lithium battery negative electrode based on copper foam growth is provided, and the steps are as follows:

[0086] (1) Cut the foamed copper with micron-scale pores into square pieces with a side length of 6mm and thin it, then immerse it in 1mol / L sulfuric acid solution, let it stand for 10h, remove the oxide layer on the surface of the foamed copper, and then use it successively Ionized water and ethanol were washed under ultrasonic vibration conditions, and vacuum-dried to obtain foamed copper with a thickness of about 1000 μm.

[0087] (2) Place the copper foam treated in step (1) in a tube furnace, raise the temperature to 390°C at a heating rate of 10°C / min in the air atmosphere, and keep it at this temperature for 8 hours. The foamed copper is partially oxidized into Copper oxide, during the oxidation process, copper oxide nanowires grow on the surface of the foame...

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Abstract

The invention provides a hollow porous tin dioxide-cuprous oxide-copper or hollow porous tin dioxide-copper integrated lithium battery negative electrode and a preparation method thereof. The lithium battery negative electrode is composed of a three-dimensional porous skeleton and a hollow column of a porous structure. There are nano-copper particles in the hollow space of the column, and the nano-copper particles divide the hollow space of the hollow column into a porous structure. Nano-copper particles, the composition of the three-dimensional porous framework is copper and cuprous oxide, or the composition of the three-dimensional porous framework is copper, and the hollow columns are evenly distributed on the surface of the three-dimensional porous framework and integrated with the three-dimensional porous framework. The three-dimensional porous and hollow space of the lithium battery negative electrode can buffer the volume expansion during charging and discharging, and the integrated structure formed by in-situ growth can effectively reduce the possibility of powdering and peeling of active particles, thereby improving the lithium storage capacity of the lithium battery negative electrode. performance.

Description

technical field [0001] The invention belongs to the field of lithium battery negative electrodes, and relates to hollow porous tin dioxide-cuprous oxide-copper integrated lithium battery negative electrodes based on foam copper growth, hollow porous tin dioxide-copper integrated lithium battery negative electrodes, and their preparation methods. Background technique [0002] With the excessive use of non-renewable resources such as coal and oil, environmental pollution is becoming more and more serious. Green and safe new energy materials have huge market potential. In recent years, the explosive growth of new energy vehicles has driven the rapid growth of the lithium battery market. Lithium battery has the advantages of high energy density, long cycle life, small self-discharge, high working voltage, and no memory effect. As an advanced electrochemical energy storage and conversion system, it has occupied most of the energy market, from mobile phones, notebook computers, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/48H01M4/62H01M10/052H01M10/0525
CPCH01M4/131H01M4/1391H01M4/483H01M4/626H01M4/628H01M10/052H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘文博卢勃勃蔡丽颜家振李宁
Owner SICHUAN UNIV
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