One-step synthesis of recoverable CuCo₂S₄ anode material for high-performance Li-ion batteries

Abstract

A facile one-step hydrothermal method has been adopted to directly synthesize the CuCo₂S₄ material on the surface of Ni foam. Due to the relatively large specific surface area and wide pore size distribution, the CuCo₂S₄ material not only effectively increases the reactive area, but also accommodates more side reaction products to avoid the difficulty of mass transfer. When evaluated as anode for Li-ion batteries, the CuCo₂S₄ material exhibits excellent electrochemical performance including high discharge capacity, outstanding cyclic stability and good rate performance. At the current density of 200 mA·g⁻¹, the CuCo₂S₄ material shows an extremely high initial discharge capacity of 2510 mAh·g⁻¹, and the cycle numbers of the material even reach 83 times when the discharge capacity is reduced to 500 mAh·g⁻¹. Furthermore, the discharge capacity can reach 269 mAh·g⁻¹ at a current of 2000 mA·g⁻¹. More importantly, when the current density comes back to 200 mA·g⁻¹, the discharge capacity could be recovered to 1436 mAh·g⁻¹, suggesting an excellent capacity recovery characteristics.

Graphical abstract

Keywords

copper cobalt sulfide / recoverability / one-step hydrothermal method / anode material / Li-ion battery

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Acknowledgements

We sincerely wish to thank Professor Yongming Zhu for his support and encouragement in this work. We also thank the project ZR2019MB027 supported by Shandong Provincial Natural Science Foundation.

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2020 Higher Education Press