Preparation method of three-dimensional porous tin-copper alloy cathode materials for lithium ion battery

A lithium-ion battery, three-dimensional porous technology, applied in the field of electrochemistry, can solve the problem of insufficient stability of the porous structure, and achieve the effect of facilitating large-scale production, improving cycle performance, and easy large-scale production

Inactive Publication Date: 2010-11-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas template method is a method for preparing a porous structure by using the accompanying precipitation of hydrogen under a high current density. The porous structure prepared by this method still has the problem of not being stable enough.

Method used

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  • Preparation method of three-dimensional porous tin-copper alloy cathode materials for lithium ion battery
  • Preparation method of three-dimensional porous tin-copper alloy cathode materials for lithium ion battery
  • Preparation method of three-dimensional porous tin-copper alloy cathode materials for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Ultrasonic cleaning the copper foam with acetone and dilute hydrochloric acid respectively to remove oil and scale.

[0025] 2. Immerse the pre-treated foamed copper in the electroless tin plating solution, and deposit a layer of off-white tin plating on the foamed copper under room temperature ultrasonic conditions.

[0026] 3. Put the tin-coated copper foam in a vacuum oven at 150°C for 2 hours. Under high temperature conditions, the tin-copper alloy phase is formed due to the atomic diffusion between tin and copper, thereby preparing a three-dimensional porous tin-copper alloy anode.

[0027] 4. Before being assembled into a battery, the three-dimensional porous tin-copper alloy negative electrode is pressed into a thin sheet under a pressure of 3Mpa, and then battery assembly and performance testing are performed.

[0028] Result Characterization:

[0029] a. by attached figure 1 It can be seen that the copper foam is a three-dimensional porous structure with ...

Embodiment 2

[0033] 1. Ultrasonic cleaning the copper foam with acetone and dilute hydrochloric acid respectively to remove oil and scale.

[0034] 2. Immerse the pretreated copper foam in the electroless tin plating solution, and keep it ultrasonic for 3 minutes at room temperature, and deposit a layer of off-white tin plating on the foam copper.

[0035]3. Press the non-heat-treated tin-coated copper foam into a thin sheet under a pressure of 3Mpa, and then perform battery assembly and performance testing.

[0036] Result Characterization:

[0037] a. by attached figure 2 a It can be seen that for the non-heat-treated tin-coated copper foam, in addition to the diffraction peaks of copper as the substrate, there are also diffraction peaks of Sn and Cu 6 sn 5 Alloy phase diffraction peaks, indicating that the electrode is three-dimensional porous Sn-Cu 6 sn 5 composite electrode.

[0038] b. By attached image 3 b It can be seen that the three-dimensional porous Sn-Cu obtained unde...

Embodiment 3

[0040] 1. Ultrasonic cleaning the copper foam with acetone and dilute hydrochloric acid respectively to remove oil and scale.

[0041] 2. Immerse the pretreated copper foam in the electroless tin plating solution, and keep it ultrasonic for 3 minutes at room temperature, and deposit a layer of off-white tin plating on the foam copper.

[0042] 3. Place the tin-coated copper foam in a vacuum oven at 200°C for 24 hours. Under high temperature conditions, a tin-copper alloy phase is formed due to atomic diffusion between tin and copper. Thus, a three-dimensional porous tin-copper alloy anode was prepared.

[0043] 4. The three-dimensional porous tin-copper alloy negative electrode was pressed into a thin sheet under a pressure of 3Mpa for battery assembly and performance testing.

[0044] Result Characterization:

[0045] a. by attached figure 2 c It can be seen that after heat treatment at 200°C for 24 hours, except for the diffraction peak of copper as the substrate, it is...

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Abstract

The invention belongs to the technical field of electrochemistry and particularly relates to a preparation method of three-dimensional porous tin-copper alloy cathode materials for a lithium ion battery. In the invention, foamy copper is adopted as a current collector, a tin layer is deposited on the foamy copper through a method of electroless tin plating, and then the three-dimensional porous tin-copper alloy cathode materials are prepared through a method of vacuum heat treatment. Formation of three-dimensional porous tin-copper alloy and excellent bonding force between active materials and a three-dimensional porous current collector are both beneficial to buffering the volume expansion effect in the charging and discharging process, and therefore, the circulation performance of the battery is dramatically improved. The invention has the advantages of simple method, low cost and easy scale production and has wide application prospect in the field of lithium ion battery cathodes.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a lithium ion battery alloy negative electrode material. Background technique [0002] With the continuous improvement of battery performance requirements for portable devices and electric vehicles, it is more and more urgent to develop batteries with high capacity and long life. Among them, the development of new battery materials is the key to improving battery performance. At present, commercial lithium-ion battery negative electrodes mainly use carbon as the active material. Tin as a negative electrode material for lithium-ion batteries has a high mass specific capacity (991mAhg -1 ) and volume specific capacity (7200mAhcc -1 ) has received widespread attention, but its main problem is that the volume expansion rate during the alloying process of tin and lithium is so large that the active material is pulverized, which leads to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/66
CPCY02E60/122Y02E60/10
Inventor 余爱水薛雷刚黄桃
Owner FUDAN UNIV
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