2D N-doped V_(2)O_(3)(N-V_(2)O_(3))nanosheets were fabricated as anode materials for Li-ion batteries by a facile sol-gel method and a subsequent deoxidation-nitridation strategy.Benefiting from the 3D V-V tunnel stru...2D N-doped V_(2)O_(3)(N-V_(2)O_(3))nanosheets were fabricated as anode materials for Li-ion batteries by a facile sol-gel method and a subsequent deoxidation-nitridation strategy.Benefiting from the 3D V-V tunnel structure,sufficient active sites and nitrogen modifications,N-V_(2)O_(3) nanosheets exhibit improved Li^(+)diffusion kinetics,robust structure and enhanced conductivity.As a result,N-V_(2)O_(3) nanosheets show a high specific capacity,long cycling life and high rate capability(136 mA h g^(-1) even after 1000 cycles at 2 A g^(-1))as anode materials for Li-ion batteries.It is instructive to note that the efficient Li+storage of N-V_(2)O_(3) is dominated by intercalation pseudocapacitance.In the mechanism of intercalation pseudocapacitance,lithium ions are intercalated into the 3D V-V tunnels and adsorbed to the V-O active sites without crystalline phase transition.This mechanism combines long cycling life with short charging/discharging times,which is suitable for stable and ultrafast Li-ion storage.展开更多
基金financially supported by the Natural Science Basic Research Program of Shaanxi(2019JLM-28,2022JQ-382)the Ningbo Natural Science Foundation and the Fundamental Research Funds for the Central Universities(31020200QD041).
文摘2D N-doped V_(2)O_(3)(N-V_(2)O_(3))nanosheets were fabricated as anode materials for Li-ion batteries by a facile sol-gel method and a subsequent deoxidation-nitridation strategy.Benefiting from the 3D V-V tunnel structure,sufficient active sites and nitrogen modifications,N-V_(2)O_(3) nanosheets exhibit improved Li^(+)diffusion kinetics,robust structure and enhanced conductivity.As a result,N-V_(2)O_(3) nanosheets show a high specific capacity,long cycling life and high rate capability(136 mA h g^(-1) even after 1000 cycles at 2 A g^(-1))as anode materials for Li-ion batteries.It is instructive to note that the efficient Li+storage of N-V_(2)O_(3) is dominated by intercalation pseudocapacitance.In the mechanism of intercalation pseudocapacitance,lithium ions are intercalated into the 3D V-V tunnels and adsorbed to the V-O active sites without crystalline phase transition.This mechanism combines long cycling life with short charging/discharging times,which is suitable for stable and ultrafast Li-ion storage.
