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Three-dimensional netted tin-copper-nickel-carbon nanotube alloy negative electrode and preparation method thereof

A technology of carbon nanotubes and three-dimensional mesh, which is applied in the direction of battery electrodes, metal material coating technology, liquid chemical plating, etc., can solve the problems of poor cycle performance of alloy negative electrode materials, and achieve high charge-discharge specific capacity, cycle powerful effect

Inactive Publication Date: 2014-04-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the problem of poor cycle performance of alloy negative electrode materials, the present invention proposes to select foamed copper as the current collector, and add Cu- (CNTs-Ni) connection layer, and the electroless nickel plating treatment of CNTs in the active material can not only improve the uniformity of the distribution of CNTs in the active material during the electroplating process, but also make the product after heat treatment form a multi-element alloy, further improving the active material itself. cycle performance

Method used

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  • Three-dimensional netted tin-copper-nickel-carbon nanotube alloy negative electrode and preparation method thereof
  • Three-dimensional netted tin-copper-nickel-carbon nanotube alloy negative electrode and preparation method thereof
  • Three-dimensional netted tin-copper-nickel-carbon nanotube alloy negative electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0070] (1) Carry out impurity removal and dispersion treatment on CNTs, select carbon nanotubes with an outer diameter of 10~20nm and a length of 1~3μm,

[0071] 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;

[0072] 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;

[0073] (2) then adopt electroless plating to the nickel coating that CNTs plating thickness is 100nm,

[0074] The formulation and conditions of electroless nickel plating are as follows:

[0075]

[0076] (3) Using the nickel-coated CNTs obtained in step (2), the Cu-(CNTs-Ni) composite coating with a thickness of 2 μm was plated on the copper foam with a specification ...

Embodiment 2

[0098] The rest of the steps are the same as in Example 1, using copper foam with a specification of 120PPI as the substrate, composite electroplating a Cu-(CNTs-Ni) composite coating with a thickness of 1 μm, and then composite electroplating a 2 μm Sn-(CNTs-Ni) alloy coating, and finally Heat treatment at 200°C for 10 hours to obtain a three-dimensional network tin-copper-nickel-CNTs alloy negative electrode. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 587mAh / g. After 200 charging cycles, the specific capacity is still 563.5mAh / g. The specific capacity decays only 4%, and the Coulombic efficiency exceeds 96. %.

Embodiment 3

[0100] All the other steps are the same as in Example 1. Using copper foam with a specification of 120PPI as the substrate, composite electroplating with a Cu-(CNTs-Ni) composite coating with a thickness of 3 μm, and then electroplating a 2 μm Sn-(CNTs-Ni) coating by co-deposition, and finally heat treatment at 200 ° C for 2 hours A three-dimensional mesh tin-copper-nickel-CNTs alloy negative electrode is obtained. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 607mAh / g. After 100 charging cycles, the specific capacity is still 588.8mAh / g. The specific capacity decays only 3%, and the Coulombic efficiency exceeds 97. %.

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Abstract

The invention discloses a three-dimensional netted tin-copper-nickel-carbon nanotube alloy negative electrode and a preparation method thereof. The preparation method of the three-dimensional netted tin-copper-nickel-carbon nanotube alloy negative electrode comprises the following steps: firstly, chemically plating carbon nanotubes with a nickel layer of a certain thickness; secondly, uniformly dispersing nickle-plated CNTs (carbon nanotubes) into a tin-plating solution; thirdly, taking foamy copper as a current collector (a plating substrate), sequentially compositely plating a CU-(CNTs-Ni) composite plating layer with the thickness of 1-3 microns, and plating an Sn-(CNTs-Ni) composite plating layer with the thickness of 0.1-3 Mum; and finally, performing thermal treatment to obtain a three-dimensional composite network alloy electrode. The alloy negative electrode has the first discharge specific capacity of 620mAh / g, and after 200cycles, the specific capacity is attenuated by only 3-5%; the preparation method is simple in process; and the prepared alloy negative electrode is excellent in performance and is applicable to large-scale industrial 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 method of connecting an active material and a current collector by using a Cu-(CNTs-Ni) transition layer, and modifying it by nickel plating A three-dimensional network of carbon nanotubes tin-based alloy anode material and its preparation method. 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 mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/1395H01M4/134C25D15/00C25D3/38C25D3/30C23C18/32
CPCY02E60/122Y02E60/10
Inventor 潘勇周益春雷维新王增红马增胜李凯田槟铖刘达
Owner XIANGTAN UNIV
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