Nickel-decorated TiO₂ nanotube arrays as a self-supporting cathode for lithium--sulfur batteries

Abstract

Lithium–sulfur batteries are considered to be one of the strong competitors to replace lithium-ion batteries due to their large energy density. However, the dissolution of discharge intermediate products to the electrolyte, the volume change and poor electric conductivity of sulfur greatly limit their further commercialization. Herein, we proposed a self-supporting cathode of nickel-decorated TiO₂ nanotube arrays (TiO₂ NTs@Ni) prepared by an anodization and electrodeposition method. The TiO₂ NTs with large specific surface area provide abundant reaction space and fast transmission channels for ions and electrons. Moreover, the introduction of nickel can enhance the electric conductivity and the polysulfide adsorption ability of the cathode. As a result, the TiO₂ NTs@Ni–S electrode exhibits significant improvement in cycling and rate performance over TiO₂ NTs, and the discharge capacity of the cathode maintains 719 mA·h·g⁻¹ after 100 cycles at 0.1 C.

Keywords

lithium--sulfur battery / TiO₂ / self-supporting / polysulfide intermediate

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Disclosure of potential conflicts of interests

The authors declare no potential conflicts of interests.

Acknowledgements

The authors acknowledge the financial support from the Natural Science Foundation of Beijing (No. L182062), the Organization Department of Beijing Talents Project (2018000021223ZK21), the Beijing Nova Program (Z171100001117077), the Yue Qi Young Scholar Project of China University of Mining & Technology (Beijing) (No. 2017QN17), and the Fundamental Research Funds for the Central Universities (No. 2014QJ02).

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2020 Higher Education Press