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Unlocking Few-Layered Ternary Chalcogenides for High-Performance Potassium-Ion Storage

Journal Article


Abstract


  • Potassium-ion batteries (KIBs) have attracted increasing attention for grid-scale energy storage due to the abundance of potassium resources, low cost, and competitive energy density. The key challenge for KIBs is to develop high-performance electrode materials. However, the exploration of high-capacity and ultrastable electrodes for KIBs remains challenging because of the sluggish diffusion kinetics of K+ ions during the charging/discharging processes. This study reports for the first time a facile ion-intercalation-mediated exfoliation method with Mg2+ cations and NO3– anions as ion assistants for the fabrication of expanded few-layered ternary Ta2NiSe5 (EF-TNS) flakes with interlayer spacing up to 1.1 nm and abundant Se sites (NiSe4 tetrahedra/TaSe6 octahedra clusters) for superior potassium-ion storage. The EF-TNS deliver a high capacity of 315 mAh g–1, excellent rate capability (121 mAh g–1 at a current density of 1000 mA g–1), and ultrastable cycling performance (81.4% capacity retention after 1100 cycles). Detailed theoretical analysis via first-principles calculations and experimental results elucidate that K+ ions intercalate through the expanded interlayers effectively and prefer to transport along zigzag pathways in layered Ta2NiSe5. This work provides a new avenue for designing novel ternary intercalation/pseudocapacitance-type KIBs with high capacity, excellent rate capability, and superior long-term cycling performance.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2019

Citation


  • Tian, H., Yu, X., Shao, H., Dong, L., Chen, Y., Fang, X., . . . Wang, G. (2019). Unlocking Few-Layered Ternary Chalcogenides for High-Performance Potassium-Ion Storage. Advanced Energy Materials, 9(29). doi:10.1002/aenm.201901560

Scopus Eid


  • 2-s2.0-85068211991

Volume


  • 9

Issue


  • 29

Abstract


  • Potassium-ion batteries (KIBs) have attracted increasing attention for grid-scale energy storage due to the abundance of potassium resources, low cost, and competitive energy density. The key challenge for KIBs is to develop high-performance electrode materials. However, the exploration of high-capacity and ultrastable electrodes for KIBs remains challenging because of the sluggish diffusion kinetics of K+ ions during the charging/discharging processes. This study reports for the first time a facile ion-intercalation-mediated exfoliation method with Mg2+ cations and NO3– anions as ion assistants for the fabrication of expanded few-layered ternary Ta2NiSe5 (EF-TNS) flakes with interlayer spacing up to 1.1 nm and abundant Se sites (NiSe4 tetrahedra/TaSe6 octahedra clusters) for superior potassium-ion storage. The EF-TNS deliver a high capacity of 315 mAh g–1, excellent rate capability (121 mAh g–1 at a current density of 1000 mA g–1), and ultrastable cycling performance (81.4% capacity retention after 1100 cycles). Detailed theoretical analysis via first-principles calculations and experimental results elucidate that K+ ions intercalate through the expanded interlayers effectively and prefer to transport along zigzag pathways in layered Ta2NiSe5. This work provides a new avenue for designing novel ternary intercalation/pseudocapacitance-type KIBs with high capacity, excellent rate capability, and superior long-term cycling performance.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2019

Citation


  • Tian, H., Yu, X., Shao, H., Dong, L., Chen, Y., Fang, X., . . . Wang, G. (2019). Unlocking Few-Layered Ternary Chalcogenides for High-Performance Potassium-Ion Storage. Advanced Energy Materials, 9(29). doi:10.1002/aenm.201901560

Scopus Eid


  • 2-s2.0-85068211991

Volume


  • 9

Issue


  • 29