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Sodium-ion batteries(SIBs) recently have received a worldwide attention due to the resource abundance of sodium and similar battery chemistry with lithium-ion batteries(LIBs). However, search for suitable anodes for SIBs still remains a challenge since graphitized carbon, the anode for commercial LIBs, usually exhibits low electrochemical Na-storage activity. In this work, a unique graphene-reinforced Ni_3S_2 thin film(Ni_3S_2/G) has been constructed and investigated as a promising anode for SIBs. The Ni_3S_2 thin film has a thickness of 200–300 nm and is composed of small sized crystals of around 100 nm. The graphene has a wrinkled surface profile which offers three-dimensional networks for electron conductivity and structural reinforcement. The Ni_3S_2/G thin film exhibits high capacity, excellent cycling stability and good rate capability due to the introduction of wrinkled graphene. Ni_3S_2/G can deliver a high initial capacity of 791 m Ah g~(-1)at 50 m A g~(-1). The capacity can be maintained at 563 m Ah g~(-1)after 110 cycles.This work provides a unique design for high-performance SIBs anodes.
Sodium-ion batteries (SIBs) recently have received a worldwide attention due to the resource abundance of sodium and similar battery chemistry with lithium-ion batteries (LIBs). However, search for suitable anodes for SIBs still remains a challenge since graphitized carbon, the anode this for commercial LIBs, often exhibits low electrochemical Na-storage activity. In this work, a unique graphene-reinforced Ni_3S_2 thin film (Ni_3S_2 / G) has been constructed and investigated as a promising anode for SIBs. The Ni_3S_2 thin film has a thickness of 200-300 nm and is composed of small sized crystals of around 100 nm. The graphene has a wrinkled surface profile which offers three-dimensional networks for electron conductivity and structural reinforcement. The Ni_3S_2 / G thin film exhibits high capacity, excellent cycling stability and good rate capability due to the introduction of wrinkled graphene. Ni_3S_2 / G can deliver a high initial capacity of 791 m Ahg -1 at 50 m A g ~ (-1). be maintained at 563 m Ah g ~ (-1) after 110 cycles. This work provides a unique design for high-performance SIBs anodes.