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Hollow nanowire-polymer film nuclear shell structure composite material and preparation method thereof

A composite material and core-shell structure technology, applied in the direction of nanotechnology, nanotechnology, structural parts, etc., can solve the problems of poor electrode interface stability and battery capacity decline, so as to improve structural stability, prevent capacity decay, and increase capacity. Effect

Inactive Publication Date: 2011-11-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-dimensional nanowire electrode may deform under stress or high temperature conditions, the nanowires are bonded to each other, and the three-dimensional structure is thinned or partially thinned, resulting in a decrease in battery capacity and poor stability of the electrode interface.

Method used

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  • Hollow nanowire-polymer film nuclear shell structure composite material and preparation method thereof
  • Hollow nanowire-polymer film nuclear shell structure composite material and preparation method thereof
  • Hollow nanowire-polymer film nuclear shell structure composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The back of the alumina template with a pore size of 200nm is compressed and sealed with a plexiglass nut with a copper electrode inside, and a gold film with a thickness of about 200nm is deposited on the other side of the double-pass alumina template by sputtering. Then place the aluminum oxide template deposited with the gold film in 20mL electrolyte, the composition of the electrolyte (aqueous solution) is 0.1M SnCl 2， 0.3MK 4 P 2 o 7 , 0.1M C 2 h 5 NO 2 and 5M NH 4 In OH, a three-electrode system was adopted, with a gold film covered with an alumina template as the working electrode, a platinum (Pt) wire as the counter electrode, and a saturated calomel electrode as the reference electrode. 2 The tin-based nanowires can be obtained in the alumina template used as the working electrode after deposition for 30 minutes.

[0024] Take out the working electrode, rinse it with distilled water three times, dry it at room temperature, and place it in 0.1M CuSO 4 Af...

Embodiment 2

[0027] The back of the alumina template with a pore size of 200nm is compressed and sealed with a plexiglass nut with a copper electrode inside, and a gold film with a thickness of about 200nm is deposited on the other side of the double-pass alumina template by sputtering. It is then placed in 20mL of electrolyte solution (aqueous solution) consisting of 0.2M SnCl 2 , 0.4M K 4 P 2 o 7 , 0.3M C 2 h 5 NO 2 and 5M NH 4 OH, using a three-electrode system, with a gold film covered with an alumina template as the working electrode, a Pt wire as the counter electrode, and a saturated calomel electrode as the reference electrode. 2 The tin-based nanowires can be obtained in the alumina template used as the working electrode after deposition for 30 minutes.

[0028] Take out the working electrode, rinse it with distilled water three times, and dry it at room temperature. Then place it in 0.1M NiSO 4 After being replaced in the aqueous solution for 30 minutes, the electrode wa...

Embodiment 3

[0031] The back of the alumina template with a pore size of 200nm is compressed and sealed with a plexiglass nut with a copper electrode inside, and a gold film with a thickness of about 200nm is deposited on the other side of the double-pass alumina template by sputtering. It is then placed in 20mL of electrolyte solution (aqueous solution) consisting of 0.2M SnCl 2， , 0.3M K 4 P 2 o 7， , 0.2M C 2 h 5 NO 2 and 5M NH 4 OH, using a three-electrode system, with a gold film covered with an alumina template as the working electrode, a Pt wire as the counter electrode, and a saturated calomel electrode as the reference electrode, at 10mA / cm 2 The tin-based nanowires can be obtained in the alumina template used as the working electrode after deposition for 20 minutes.

[0032] Take out the working electrode, rinse it with distilled water three times, and dry it at room temperature. Then place it in 0.1M NiSO 4 After being replaced in the aqueous solution for 30 minutes, the...

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Abstract

The invention discloses a nuclear shell structure composite material which consists of a nuclear shell structure in which a tin based nanowire is covered by a polymer thin film, wherein the nuclear structure of the composite material is a tin based nanowire of a hollow structure, and the shell structure of the composite material is the polymer thin film which is arranged at the outer periphery of the tin based nanowire; the tin based nanowire is made of copper tin alloy, a cobalt tin alloy or a nickel tin alloy, and the polymer film is a polymethyl methacrylate thin film. The preparation method comprises the followings steps: preparing the tin nanowire by utilizing template electro deposition; preparing the hollow structure by introducing the current replacement reaction; then preparing a PMMA (polymethyl methacrylate) thin film after chambering; and finally removing a template. The lithium ion battery capacity is improved prominently by utilizing the space advantage of a three-dimensional nanowire structure, the volume expansion of tin in the charge and discharge processes is remitted by utilizing the hollow structure at the interior and the polymer thin film at the surface, the structural stability of the electrode is improved, the capacity attenuation is prevented, and a negative electrode material which is high in capacity and good in circulation performance can be obtained.

Description

technical field [0001] The invention relates to energy storage materials, more specifically, to a composite material used in lithium ion batteries and a preparation method thereof. Background technique [0002] With the rapid development of the electronics and information industries, especially micro-electromechanical systems, portable electronic devices such as notebook computers, mobile phones, etc., and the development of the electric vehicle industry, lithium-ion batteries are developing in the direction of miniaturization and high power, so With graphite (theoretical capacity 372mAh·g -1 ) Lithium-ion battery as the negative electrode can no longer meet its capacity requirements. Therefore, the development of high-capacity lithium-ion batteries has important research value. [0003] As a negative electrode material for lithium-ion batteries, tin has a high mass specific capacity (993mAh g -1 ) and volume specific capacity (7237Ah L -1 ) has received widespread atten...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1391B82Y30/00B82Y40/00
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 许鑫华郭美卿路会冉吴湘锋范海南刘峰
Owner TIANJIN UNIV
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