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Carbon nano tube-Sn-M alloy cathode material and preparation method thereof

An alloy anode and carbon nanotube technology, which is applied in electrolytic coatings, battery electrodes, electrical components, etc., can solve the problems of poor cycle performance of alloy anode materials, and achieve the effects of excellent cycle performance, enhanced cycle performance, and complete structure.

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

[0009] Aiming at the problem of poor cycle performance of alloy negative electrode materials, the present invention composites carbon nanotubes into the electrode, and adds a layer between the active material (the carbon nanotube-tin-M composite layer obtained after the last heat treatment) and the current collector. CNTs-Cu connection layer, combined with the advantages of multi-element alloys, provides a CNTs-Sn-M alloy negative electrode and its preparation method

Method used

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  • Carbon nano tube-Sn-M alloy cathode material and preparation method thereof
  • Carbon nano tube-Sn-M alloy cathode material and preparation method thereof
  • Carbon nano tube-Sn-M alloy cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] (1) Remove impurities and disperse the CNTs: the specifications of the selected CNTs are: the outer diameter is 20nm, and the length is 3μm;

[0054] Add the HCl solution that the mass concentration is 18.25% in the container that contains CNTs, obtain the pretreatment liquid that CNTs content is 4g / L;

[0055] The above pretreatment solution was ultrasonically oscillated while mechanically stirring for 3 hours, then magnetically stirred for 24 hours, then the CNTs were separated from the pretreatment solution, and finally the CNTs were dried for 24 hours;

[0056] (2) Using copper foil as the substrate (current collector), the CNTs-Cu coating is plated by DC electroplating, and its thickness is 4 μm;

[0057] The formulation and conditions of electroplating CNTs-Cu composite coating are as follows:

[0058] Copper pyrophosphate 70g / L;

[0059] Potassium pyrophosphate 320g / L;

[0060] Sodium Potassium Tartrate 40mL / L;

[0061] Sodium dihydrogen phosphate 30g / L;

[...

Embodiment 2

[0078] The remaining steps are the same as in embodiment (1). A 2 μm thick Sn-Sb alloy coating was electroplated on the copper foil coated with CNTs-Cu by co-deposition, and finally heat-treated at 200°C for 24 hours to obtain a CNTs-Sn-Sb alloy negative electrode. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 603mAh / g, and after 100 charging cycles, the specific capacity is still 585mAh / g, the specific capacity decay is only 2.5%, and the Coulombic efficiency exceeds 95%. .

Embodiment 3

[0080] The remaining steps are the same as in embodiment (1). A 2 μm thick tin-cobalt alloy coating was electroplated on the copper foil coated with CNTs-Cu by co-deposition, and finally heat-treated at 200°C for 18 hours to obtain a CNTs-Sn-Co alloy negative electrode. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 596mAh / g. After 100 charging cycles, the specific capacity is still 572mAh / g. The specific capacity decay is only 4%, and the Coulombic efficiency exceeds 92%. .

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Abstract

The invention discloses a carbon nano tube-Sn-M alloy cathode material and a preparation method of the carbon nano tube-Sn-M alloy cathode material. According to the invention, carbon nano tubes (CNTs) are composited into an electrode; a CNTs-Cu connection layer is added between the active material and a current collector; and the advantages of multicomponent alloy are combined, so that the circulation property of the alloy cathode is greatly improved. According to the invention, copper foil is used as a current collector (electroplate substrate) to composite and electroplate a CNTs-Cu composite coating with the thickness of 1-5 micro and a thin tin (or tin alloy) film with a thickness of 1-4 micro in sequence; and finally the CNTs-Sn-M alloy cathode material is obtained by heat treatment. The lithium ion battery alloy cathode prepared by adopting the method has a specific discharge capacity of 500-800 mAh / g for the first time, and the specific capacity is only decayed by 2-5 percent after 100 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 tin-based alloy negative electrode material using a CNTs-Cu connection layer to connect an active material and a current collector 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 lithium-ion battery that has been industrialized is carbon material, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62C25D15/00C25D3/30
CPCY02E60/10
Inventor 潘勇周益春雷维新朱岭马增胜朱经涛李真真潘俊安
Owner XIANGTAN UNIV
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