Abstract
We synthesized a flexible lithium-ion battery (LIB) anode with a flower-like CuCo2O4 nanostructure grown on the surface of conductively-treated filter paper. The filter paper, made of cotton fibers, has good flexibility, but its poor conductivity limits its application in flexible electrodes. An Ni coating by magnetron sputtering can significantly improve its conductivity, which enables it to be used as a substrate for flexible electrodes. The flower-like CuCo2O4 nanostructure is assembled from CuCo2O4 nanowires with a diameter of 50 nm, while the CuCo2O4 nanowires are assembled from CuCo2O4 nanoparticles with a size of 10–20 nm. The gap between the stacked CuCo2O4 nanoparticles causes the porous structure of the CuCo2O4 nanowires. The high theoretical capacity of CuCo2O4, the porous structure of the CuCo2O4 nanowires, and the tiny CuCo2O4 nanoparticles lead to the excellent electrochemical performance of the CuCo2O4 flower-like nanostructure. It maintains capacity very well during cycling and delivers a high capacity of 989 mAh g−1 at a current density of 100 mA g−1. As a flexible LIB anode, the composite with the flower-like CuCo2O4 nanostructure grown on the surface of conductively-treated filter paper delivers a stable capacity of 544 mAh g−1 at a current density of 100 mA g−1 and a capacity of 304 mAh g−1 at a high current density of 2000 mA g−1. The conductively-treated filter paper substrate can significantly improve the battery property of the hydrothermally-fabricated CuCo2O4.
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Acknowledgments
This work is sponsored by the fund from High-energy Beam Intelligent Processing and Green Manufacturing Project of Shanghai Municipal Education Commission. The authors acknowledge the use of the facilities in Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology.
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Luo, F., Yang, Q. Flower-Like Nanostructured CuCo2O4 Grown on the Surface of Conductively-Treated Filter Paper as a Flexible Anode for Lithium-Ion Batteries. J. Electron. Mater. 49, 5488–5497 (2020). https://doi.org/10.1007/s11664-020-08290-9
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DOI: https://doi.org/10.1007/s11664-020-08290-9