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Carbon nano tube enhanced tin-copper-nickel alloy cathode and preparation method thereof

A technology of carbon nanotubes and nickel alloys, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor cycle performance of alloy negative electrode materials, achieve excellent cycle performance, improve high-rate charge and discharge performance, and reduce pulverization with the shedding effect

Inactive Publication Date: 2013-04-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of poor cycle performance of alloy negative electrode materials, and propose a carbon nanotube-reinforced tin-copper-nickel alloy negative electrode and its preparation method

Method used

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  • Carbon nano tube enhanced tin-copper-nickel alloy cathode and preparation method thereof
  • Carbon nano tube enhanced tin-copper-nickel alloy cathode and preparation method thereof
  • Carbon nano tube enhanced tin-copper-nickel alloy cathode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] (1) Carry out impurity removal and dispersion treatment on CNTs, select carbon nanotubes with an outer diameter of 10~20nm and a length of 3~5μm,

[0069] The steps for treating CNTs are as follows: first add HCl solution with a mass concentration of 18.25% into the container containing CNTs to obtain a pretreatment solution with a CNTs content of 2 g / L;

[0070] Then ultrasonically vibrate the above-mentioned pre-treatment liquid while mechanically stirring for 2 hours, then magnetically stir for 10 hours, then separate the CNTs from the pre-treatment liquid, and finally dry the CNTs for 24 hours;

[0071] (2) then adopt electroless plating to the nickel coating that CNTs plating thickness is 100nm,

[0072] The formulation and conditions of electroless nickel plating are as follows:

[0073]

[0074]

[0075] (3) Using the nickel-coated CNTs obtained in step (2), a Cu-(CNTs-Ni) composite coating with a thickness of 4 μm was prepared on the copper foil by DC ele...

Embodiment 2

[0097] All the other steps are the same as in Example 1. Finally, a heat treatment at 200 °C for 12 hours was performed to obtain a Sn-Cu-Ni alloy anode reinforced by CNTs. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 585mAh / g. After 200 charging cycles, the specific capacity is still 550mAh / g. The specific capacity decays only 6%, and the Coulombic efficiency exceeds 96%. .

Embodiment 3

[0099] All the other steps are the same as in Example 1. Finally, a heat treatment at 200 °C for 3 hours was performed to obtain a Sn-Cu-Ni alloy anode reinforced by CNTs. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 593mAh / g. After 100 charging cycles, the specific capacity is still 563.3mAh / g. The specific capacity decays only 5%, and the Coulombic efficiency exceeds 97. %.

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Abstract

The invention discloses a carbon nano tube enhanced tin-copper-nickel alloy cathode used for a lithium ion battery, and a preparation method of the cathode. According to the invention, the electroplating method is adopted to composite carbon nano tubes into an electrode, and chemical nickel plating processing to the carbon nano tubes is performed before electroplating; and furthermore, a Cu-(CNTs-Ni) connection layer is added between active material and a current collector, thereby improving the circulation property of the alloy cathode greatly. According to the invention, copper foil is used as a current collector (electroplating substrate) to composite and electroplate a Cu-(CNTs-Ni) composite coating and a Sn-(CNTs-Ni) composite coating in sequence, and finally the carbon nano tube enhanced tin-copper-nickel alloy cathode is obtained by heat treating. The lithium ion battery tin-copper-nickel alloy cathode prepared by adopting the method has a specific discharge capacity of 500-700 mAh / g for the first time, and the specific capacity is only decayed by 4-6 percent after 200 times of circulation. According to the invention, the process is simple, the performance of the prepared alloy cathode is good, and the alloy cathode is suitable for performing large-scale industrialized production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery manufacturing, and relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a Cu-(CNTs-Ni) transition layer used to connect active materials and current collectors, and compounded with nickel-plated modified A negative electrode material of a tin-based alloy of carbon nanotubes and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high power density, good safety performance, and long cycle life, and do not contain lead, cadmium, mercury and other pollutants, so they are an ideal energy storage device. With the rapid development of power tools with high power requirements such as electric vehicles and portable electrical appliances such as notebook computers, the capacity of lithium-ion batteries is increasingly required. At present, the anode material of lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/38
CPCY02E60/10
Inventor 潘勇周益春雷维新李旭军马增胜黄少军刘才超彭美玲
Owner XIANGTAN UNIV
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