Hybrid Redox Chemistry in Defective Titanium Polyanion Nanobelt Cathodes for Advanced Magnesium–Ion Batteries
Abstract 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 ( V s −TiS 3 ) 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 TiS 2 formed during cycling is found to have a strong adsorption effect on the side products of magnesium polysulfides (MgS x ), 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 + , Al 3+ ), demonstrating its versatility.
Authors
- Qingyu Yan (ORCID: https://orcid.org/0000-0003-0317-3225)
- Yi Ren (ORCID: https://orcid.org/0000-0002-0075-3454)
- Xian Yi Tan (ORCID: https://orcid.org/0000-0002-7501-6723)
- Wutthikrai Busayaporn (ORCID: https://orcid.org/0000-0002-9891-7559)
- Carina Yi Jing Lim (ORCID: https://orcid.org/0000-0002-7172-9726)
- Man‐Fai Ng (ORCID: https://orcid.org/0000-0001-7696-2706)
- Jianbiao Wang (ORCID: https://orcid.org/0000-0002-5004-3047)
- Deviprasath Chinnadurai (ORCID: https://orcid.org/0000-0002-9548-0291)
- Zhi Wei Seh (ORCID: https://orcid.org/0000-0003-0953-567X)
- Dechmongkhon Kaewsuwan (ORCID: https://orcid.org/0009-0002-4375-4702)
- Zhenxiang Xing (ORCID: https://orcid.org/0009-0008-9779-210X)
- Gaoliang Yang (ORCID: https://orcid.org/0000-0003-1090-7610)
- Wanwisa Limphirat (ORCID: https://orcid.org/0000-0001-9870-9752)
- Gang Wu (ORCID: https://orcid.org/0000-0002-0055-0200)
- Tanmay Ghosh
Institutions
- Agency for Science, Technology and Research (SG)
- Nanyang Technological University (SG)
- Institute of High Performance Computing (SG)
- Synchrotron Light Research Institute (TH)
- Institute of Materials Research and Engineering (SG)
- Stanford University (US)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2025-08-17
- DOI
- https://doi.org/10.1002/adfm.202512519
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Agency for Science, Technology and Research
- National Research Foundation Singapore