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The Fabrication of Freestanding Heterogeneous Copper-Tin Films with Meniscus Brush Plating Electrodeposition

Kimberly Y. Scott^*| Anna Halajko | Glenn G. Amatucci

Energy Storage Research Group, Department of Materials Science & Engineering, Rutgers University, North Brunswick NJ 08902 USA

Trainee, Nanotechnology for Clean Energy IGERT

Corresponding Author Email:

kscotty17@gmail.com

Received:

17 September 2014

| |

Accepted:

18 November 2014

| | Citation

386-article_25-36.pdf

OPEN ACCESS

Abstract:

A meniscus brush plating electrodeposition technique was utilized in conjunction with a post deposition heat treatment to formulate freestanding copper-tin alloy films for negative electrodes of lithium-ion batteries. The described fabrication technique intertwined the electrode and current collector for improved cell volume utilization and stability. Two designs were examined to establish the best diffusivity to form electrochemically proficient copper-tin alloys. Fabrication was optimized to promote diffusion of copper and tin and to form the desired intermetallic phase of Cu₆Sn₅. This improved design fabricated films with competitive areal capacities above 1000 mAh/cc and 2.5 mAh/cm² for the complete electrode and current collector structure.

Keywords:

lithium alloys, copper-tin alloys, lithium ion batteries, negative electrodes, electrodeposition

1. Introduction

2. Experimental

3. Results and Discussion

4. CU-SN Bilayer Films Incorporated Into Li-ION Cells

5. Conclusions

Acknowledgments

The authors acknowledge the financial support of Defense Ad-vanced Research Projects Agency N66001-10-C-2013 and National Science Foundation Grant No. 0903661 “Nanotechnology for Clean Energy IGERT.” The authors would also like to thank Barry Vanning, John Gural and Nathalie Pereira for their technical assis-tance.

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The Fabrication of Freestanding Heterogeneous Copper-Tin Films with Meniscus Brush Plating Electrodeposition