NH_(4)V_(4)O_(10)(NVO)is considered a promising cathode material for aqueous zinc-ion batteries due to its high theoretical capacity.However,its practical application is limited by irreversible deamination,structural ...NH_(4)V_(4)O_(10)(NVO)is considered a promising cathode material for aqueous zinc-ion batteries due to its high theoretical capacity.However,its practical application is limited by irreversible deamination,structural collapse,and sluggish reaction kinetics during cycling.Herein,K+and C_(3)N_(4)co-intercalated NVO(KNVO-C_(3)N_(4))nanosheets with expanded interlayer spacing are synthesized for the first time to achieve high-rate,stable,and wide-temperature cathodes.Molecular dynamics and experimental results confirm that there is an optimal C_(3)N_(4)content to achieve higher reaction kinetics.The synergistic effect of K^(+)and C_(3)N_(4)co-intercalation significantly reduces the electrostatic interaction between Zn^(2+)and the[VOn]layer,improves the specific capacity and cycling stability.Consequently,the KNVO-C_(3)N_(4)electrode displays outstanding electrochemical performance at room temperature and under extreme environments.It exhibits excellent rate performance(228.4 m Ah g^(-1)at 20 A g^(-1)),long-term cycling stability(174.2 m Ah g^(-1) after 10,000 cycles at 20 A g^(-1)),and power/energy density(210.0 Wh kg^(-1)at 14,200 W kg^(-1))at room temperature.Notably,it shows remarkable storage performance at-20℃(111.3 m Ah g^(-1)at 20 A g^(-1))and 60℃(208.6 m Ah g^(-1)at 20 A g^(-1)).This strategy offers a novel approach to developing high-performance cathodes capable of operating under extreme temperatures.展开更多
基金the financial support provided by the PolyU Postdoc Matching Fund 1-W34P,ITF project ITP/023/22TP,PolyU RCRE fund 1-BBCB,IWEAR fund 1-CD8E,MTR Research Funding Scheme(PTU24019)the Hong Kong Polytechnic University(P0043508 and P0044761)。
文摘NH_(4)V_(4)O_(10)(NVO)is considered a promising cathode material for aqueous zinc-ion batteries due to its high theoretical capacity.However,its practical application is limited by irreversible deamination,structural collapse,and sluggish reaction kinetics during cycling.Herein,K+and C_(3)N_(4)co-intercalated NVO(KNVO-C_(3)N_(4))nanosheets with expanded interlayer spacing are synthesized for the first time to achieve high-rate,stable,and wide-temperature cathodes.Molecular dynamics and experimental results confirm that there is an optimal C_(3)N_(4)content to achieve higher reaction kinetics.The synergistic effect of K^(+)and C_(3)N_(4)co-intercalation significantly reduces the electrostatic interaction between Zn^(2+)and the[VOn]layer,improves the specific capacity and cycling stability.Consequently,the KNVO-C_(3)N_(4)electrode displays outstanding electrochemical performance at room temperature and under extreme environments.It exhibits excellent rate performance(228.4 m Ah g^(-1)at 20 A g^(-1)),long-term cycling stability(174.2 m Ah g^(-1) after 10,000 cycles at 20 A g^(-1)),and power/energy density(210.0 Wh kg^(-1)at 14,200 W kg^(-1))at room temperature.Notably,it shows remarkable storage performance at-20℃(111.3 m Ah g^(-1)at 20 A g^(-1))and 60℃(208.6 m Ah g^(-1)at 20 A g^(-1)).This strategy offers a novel approach to developing high-performance cathodes capable of operating under extreme temperatures.
