Nb-Doped TiO2 with Outstanding Na/Mg-Ion Battery Performance

Hongwei Bi; Shengli Zhu; Yanqin Liang; Hui Jiang; Zhaoyang Li; Shuilin Wu; Hao Wei; Chuntao Chang; Hao Wang; Zhenduo Cui

doi:10.1021/acsomega.2c07689

Nb-Doped TiO₂ with Outstanding Na/Mg-Ion Battery Performance

ACS Omega. 2023 Jan 30;8(6):5893-5900. doi: 10.1021/acsomega.2c07689. eCollection 2023 Feb 14.

Authors

Hongwei Bi¹, Shengli Zhu^{1

2}, Yanqin Liang^{1

2}, Hui Jiang^{1

2}, Zhaoyang Li^{1

2}, Shuilin Wu^{1

2}, Hao Wei³, Chuntao Chang⁴, Hao Wang⁵, Zhenduo Cui^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Tianjin University, Tianjin300350, China.
² Tianjin Key Laboratory of Composite and Functional Materials, Tianjin300350, China.
³ Cell Development Department, BYD Company Limited, Shenzhen518116, China.
⁴ School of Mechanical Engineering, Dongguan University of Technology, Dongguan523808, China.
⁵ Institute for Material Research, Tohoku University, Sendai9808577, Japan.

Abstract

The group "beyond Li-ion" batteries (Na/Mg-ion batteries) have the advantages of abundant reserves and high theoretical specific capacity. However, the sluggish kinetics resulting from large ion radius (Na⁺) and polarity (Mg²⁺) seriously limit the battery performance. Herein, we prepared Nb-doped anatase TiO₂ with Ti vacancies (Nb-TiO₂) through a simple solvothermal and subsequent calcination process. The Nb doping widens the channels for metal ion diffusion, and the cationic vacancies can act as ion storage sites and improve the electrode conductivity. Thus, Nb-TiO₂ exhibits improved performance for rechargeable Na/Mg-ion batteries.