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Carbon-Cu6Sn5 alloy negative electrode materials and preparation method thereof

A -cu6sn5, alloy negative electrode technology, applied in the field of lithium ion battery manufacturing, can solve the problem of poor cycle performance of alloy negative electrode materials, achieve excellent cycle performance and rate charge-discharge performance, good electrical conductivity and mechanical properties, strong cycle performance Effect

Inactive Publication Date: 2013-04-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the problem of poor cycle performance of alloy negative electrode materials. Carbon nanotubes and graphene are compounded into the electrode, and the active material (carbon-Cu obtained after the last heat treatment step) 6 sn 5 The Cu-CNTs connection layer is added between the current collector and the current collector, providing a carbon-Cu 6 sn 5 Alloy negative electrode material and preparation method thereof

Method used

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  • Carbon-Cu6Sn5 alloy negative electrode materials and preparation method thereof
  • Carbon-Cu6Sn5 alloy negative electrode materials and preparation method thereof
  • Carbon-Cu6Sn5 alloy negative electrode materials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] (1) Remove impurities and disperse the CNTs: the specifications of the selected CNTs are: the outer diameter is 20nm, and the length is 3μm;

[0063] 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;

[0064] 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;

[0065] (2) Copper foil is used as the substrate (current collector), and the Cu-CNTs coating is plated by DC electroplating, with a thickness of 4 μm;

[0066] The formulation and conditions of electroplating Cu-CNTs composite coating are as follows:

[0067] Copper pyrophosphate 70g / L;

[0068] Potassium pyrophosphate 320g / L;

[0069] Potassium Sodium Tartrate 30mL / L;

[0070] Sodium dihydrogen phosphate 30g / L;...

Embodiment 2

[0088] All the other steps are identical with embodiment (1). A 2 μm tin-graphene alloy coating was electroplated on the copper foil coated with CNTs-Cu by composite electroplating, and finally heat-treated at 200°C for 10 hours to obtain carbon-Cu 6 sn 5 Alloy anode materials. Using the conventional lithium-ion battery test method, the first discharge mass specific capacity of the negative electrode effective material is 587mAh / g. After 100 charging cycles, the specific capacity is still 563.5mAh / g. The specific capacity decays only 4%, and the Coulombic efficiency exceeds 96. %.

Embodiment 3

[0090] The remaining steps are the same as in embodiment (1). A 2 μm tin-CNTs-graphene coating was electroplated on the copper foil coated with CNTs-Cu by composite electroplating, and finally heat-treated at 200°C for 10 hours to obtain carbon-Cu 6 sn 5 Alloy anode materials. Using conventional lithium-ion battery test methods, 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 carbon-Cu6Sn5 alloy negative electrode materials and a preparation method thereof. The carbon-Cu6Sn5 alloy negative electrode materials and the preparation method thereof combine carbon nanometer tubes and graphene into electrodes and add a Cu-CNTs connecting layer between active materials and current collectors. Therefore, cyclic perforce of an alloy negative electrode is improved greatly. The carbon-Cu6Sn5 alloy negative electrode materials and the preparation method thereof use copper foils as the current collectors (electroplating substrates). The copper foils are plated by a Cu-CNTs composite plating and a composite plating of stannum-carbon nanometer tubes or stannum- graphene or stannum-carbon nanometer tubes- graphenes in sequence, wherein the thickness of the Cu-CNTs composite plating is 1-5 micrometers and the thickness of the composite plating of the stannum-carbon nanometer tubes or the stannum- graphene or the stannum-carbon nanometer tubes- graphene is 1-4 micrometers. The carbon-Cu6Sn5 alloy negative electrode materials can be obtained finally through thermal treatments. First specific discharge capacity of lithium ion battery alloy cathodes prepared by the method can achieve 613 m AH / g and specific capacity attenuation of the lithium ion battery alloy cathodes is only 4%-6% after 100 cycles. The carbon-Cu6Sn5 alloy negative electrode materials and the preparation method thereof are simple in technique, good in prepared alloy cathode performance and suitable for 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 tin-based alloy negative electrode material doped with carbon nanotubes or graphene, or a mixture of the two 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 material of lithium-ion battery that has been industrialized is carbon material, and its theoretical specific capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M4/1395C25D15/00C25D5/50
CPCY02E60/122Y02E60/10
Inventor 潘勇周益春雷维新成娟娟马增胜曹丰文周稳蒋志杰
Owner XIANGTAN UNIV
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