Hybrid Redox Chemistry in Defective Titanium Polyanion Nanobelt Cathodes for Advanced Magnesium–Ion Batteries

Hybrid Redox Chemistry in Defective Titanium Polyanion Nanobelt Cathodes for Advanced Magnesium–Ion Batteries

Advanced Functional Materials

org/10.1002/adfm.202512519

https://doi.org/10.1002/adfm.202512519

Jianbiao Wang, Xian Yi Tan, Man‐Fai Ng, Gang Wu, Gaoliang Yang, Tanmay Ghosh, Carina Yi Jing Lim, Wutthikrai Busayaporn, Wanwisa Limphirat, Dechmongkhon Kaewsuwan, Deviprasath Chinnadurai, Zhenxiang Xing, Hongfei Liu, Yi Ren, Qingyu Yan, Zhi Wei Seh

18 August 2025

Wang, J., Tan, X. Y., Ng, M., Wu, G., Yang, G., Ghosh, T., Lim, C. Y. J., Busayaporn, W., Limphirat, W., Kaewsuwan, D., Chinnadurai, D., Xing, Z., Liu, H., Ren, Y., Yan, Q., & Seh, Z. W. (2025). Hybrid redox chemistry in defective titanium polyanion nanobelt cathodes for advanced Magnesium–Ion batteries. Advanced Functional Materials. https://doi.org/10.1002/adfm.202512519

Parasitic reactions have hampered transition metal chalcogenide cathodes in magnesium−ion batteries (MIBs), especially for conversion−type cathodes. To fully harness its high theoretical capacity and restrict undesirable side reactions, a defective titanium polyanion cathode (Vs−TiS3) with exposed (001) facets is prepared via a fast−quenching treatment. The performance of the cathode material is investigated in MIBs for the first time, demonstrating a new hybrid energy storage mechanism involving both insertion and conversion reactions. Moreover, the defective TiS2 formed during cycling is found to have a strong adsorption effect on the side products of magnesium polysulfides (MgSx), boosting magnesium storage performance. Consequently, the electrodes delivered a substantial capacity of 717.3 mAh g−1 at 25 mA g−1, and a high capacity of 291.5 mAh g−1 at 500 mA g−1 after 100 cycles, surpassing the performance of previously reported MIBs at the same current density. When employed in pouch cells, a high energy density of 220 Wh kg−1 is achieved. Lastly, this cathode material is also adapted for other mono/multivalent metal−ion batteries (e.g., Li+, Na+, Al3+), demonstrating its versatility.

Publisher Copyright

This research / project is supported by the Singapore National Research Foundation - National Research Foundation Investigatorship
Grant Reference no. : NRF-NRFI09-0002

This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity Programmatic Fund
Grant Reference no. : M23L9b0052

This is the peer reviewed version of the following article: Wang, J., Tan, X. Y., Ng, M., Wu, G., Yang, G., Ghosh, T., Lim, C. Y. J., Busayaporn, W., Limphirat, W., Kaewsuwan, D., Chinnadurai, D., Xing, Z., Liu, H., Ren, Y., Yan, Q., & Seh, Z. W. (2025). Hybrid redox chemistry in defective titanium polyanion nanobelt cathodes for advanced Magnesium–Ion batteries. Advanced Functional Materials. https://doi.org/10.1002/adfm.202512519, which has been published in final form at https://doi.org/10.1002/adfm.202512519. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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Institute of Materials Research and Engineering