Boosting anionic redox of TiS4 via Se anion doping for high-performance Al-ion batteries
Junfeng Li,
Yunshan Zheng,
Kwan San Hui,
Kaixi Wang,
Chenyang Zha,
Sambasivam Sangaraju,
Xi Fan,
Yanli Chen,
Guangmin Zhou,
Kwun Nam Hui
Affiliations
Junfeng Li
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, PR China; Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Yunshan Zheng
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, PR China
Kwan San Hui
Department of Mechanical Engineering, College of Engineering, Prince Mohammad Bin Fahd University, P.O. Box 1664, Al Khobar 31952, Kingdom of Saudi Arabia; Corresponding authors.
Kaixi Wang
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, PR China
Chenyang Zha
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, PR China
Sambasivam Sangaraju
National Water and Energy Center, United Arab Emirates University, Al Ain 15551, United Arab Emirates
Xi Fan
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China
Yanli Chen
College of Physics, Guizhou University, Guiyang 550025, China
Guangmin Zhou
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Kwun Nam Hui
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, PR China; Corresponding authors.
Aluminum-ion batteries (AIBs) are gaining attention for large-scale energy storage due to their low cost and high theoretical capacity. However, the existing cathode materials frequently encounter rapid capacity degradation and sluggish reaction kinetics due to the strong interaction with high-charge Al3+, which limits the utilization of AIBs. Here, the Se-doping strategy is proposed to facilitate the active participation of anions in charge compensation and enhance the anionic redox process of amorphous anion-rich TiS4. A refined amount of Se doping effectively improves reaction kinetics for Al-storage and stabilizes the structure of the material, preventing polysulfide dissolution under high dealumination states. As a result, amorphous TiS3.5Se0.5 delivers unprecedented Al3+ storage performance, with a stable capacity of 210mAhg−1 at 500 mA g−1 over 400 cycles. Through detailed characterization, we reveal that a-TiS3.5Se0.5 undergoes reversible Al3+ insertion, accompanied by anionic redox processes involving S22- and Sen- species, which lays the foundation for further development of anionic-redox-based cathodes for high-performance AIBs.
