The advancement of sodium-ion batteries is impeded by challenges such as sluggish ion kinetics and structural instability,particularly in nitride and telluride-based anodes.Herein,a novel multiheterostructured composi...The advancement of sodium-ion batteries is impeded by challenges such as sluggish ion kinetics and structural instability,particularly in nitride and telluride-based anodes.Herein,a novel multiheterostructured composite,MoN/CoTe/NiTe_(2)@NCNTs,was rationally designed by integrating multiple electroactive phases,conductive networks,and hierarchical frameworks into a unified architecture.Unlike conventional binary heterostructures,this ternary system leverages multi-phase synergy to construct extensive interfacial charge redistribution zones,enhancing both structural stability and Na~+ diffusion kinetics.The multidimensional framework ensures structural robustness and buffers volume fluctuations during electrochemical cycling.In half-cell tests,the composite delivers a high reversible capacity of 375.7 mAhg^(-1) at 0.2 A g^(-1),retaining 230.1 mAhg^(-1) after 1000 cycles at 2.0 A g^(-1), demonstrating excellent cycling stability.Even at a high current density of 10.0 A g^(-1),a remarkable capacity of 197.7 mAh g^(-1) is maintained.In full-cell configuration,the MoN/CoTe/NiTe_(2)@NCNTs//Na_(3)V_(2)(PO_4)_(3) system achieves a competitive energy density of 146.9 Wh kg^(-1) and excellent cycling stability with an average capacity degradation rate of <0.11 % per cycle over 500 cycles.Combined density functional theory calculations and ex-situ characterizations reveal a phase-dependent sodium storage mechanism,where intercalation dominates at MoN-rich sites and conversion reactions occur at CoTe/NiTe_(2) domains,supported by interfacial charge redistribution.This work offers a promising strategy for designing advanced multi-heterostructured materials and provides valuable insights into the practical application of highperformance sodium-ion batteries.展开更多
基金financially supported by the program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future planning (grant number 2022R1A4A1034312, 2023R1A2C1007413)the Commercialization Promotion Agency for R&D Outcomes (COMPA) grant funded by the Korean Government (Ministery of Science and ICT) (RS2023-00304764)。
文摘The advancement of sodium-ion batteries is impeded by challenges such as sluggish ion kinetics and structural instability,particularly in nitride and telluride-based anodes.Herein,a novel multiheterostructured composite,MoN/CoTe/NiTe_(2)@NCNTs,was rationally designed by integrating multiple electroactive phases,conductive networks,and hierarchical frameworks into a unified architecture.Unlike conventional binary heterostructures,this ternary system leverages multi-phase synergy to construct extensive interfacial charge redistribution zones,enhancing both structural stability and Na~+ diffusion kinetics.The multidimensional framework ensures structural robustness and buffers volume fluctuations during electrochemical cycling.In half-cell tests,the composite delivers a high reversible capacity of 375.7 mAhg^(-1) at 0.2 A g^(-1),retaining 230.1 mAhg^(-1) after 1000 cycles at 2.0 A g^(-1), demonstrating excellent cycling stability.Even at a high current density of 10.0 A g^(-1),a remarkable capacity of 197.7 mAh g^(-1) is maintained.In full-cell configuration,the MoN/CoTe/NiTe_(2)@NCNTs//Na_(3)V_(2)(PO_4)_(3) system achieves a competitive energy density of 146.9 Wh kg^(-1) and excellent cycling stability with an average capacity degradation rate of <0.11 % per cycle over 500 cycles.Combined density functional theory calculations and ex-situ characterizations reveal a phase-dependent sodium storage mechanism,where intercalation dominates at MoN-rich sites and conversion reactions occur at CoTe/NiTe_(2) domains,supported by interfacial charge redistribution.This work offers a promising strategy for designing advanced multi-heterostructured materials and provides valuable insights into the practical application of highperformance sodium-ion batteries.
