Nano-structure designs with conductive networks have been demonstrated as an efficient strategy to boost sodium storage properties for transition metal sulfides.Herein,an exquisite nanosheets self-assembled hierarchic...Nano-structure designs with conductive networks have been demonstrated as an efficient strategy to boost sodium storage properties for transition metal sulfides.Herein,an exquisite nanosheets self-assembled hierarchical flower-ball-like CuFeS_(2)embedded into the reduced graphene oxide(RGO)nanosheet matrix(F-CuFeS_(2)@RGO)is fabricated via a concise two-step solvothermal method.Such a well-designed architecture affords increased active reaction interfaces and enhanced mixed ionic/electronic conductivity.Meanwhile,the external RGO matrix can effectively alleviate the volume expansion and create a stable structure during long cycles.As a result,the composite material exhibits a high reversible capacity of 559 mAh·g^(-1)at 0.1 A·g^(-1),a superior rate capability of 455 mAh·g^(-1)at 5 A·g^(-1)and excellent cyclic stability with 96%capacity retention after 4800 cycles at 5 A·g^(-1),among the best in the state-of-the-art transition metal sulfide anodes.Especially,F-CuFeS_(2)@RGO delivers outstanding low-temperature performances with a high capacity retention of 100%and 91%at-20 and-40℃,respectively,over 200 cycles.The proposed hierarchical structure fabrication paves a new direction in the design of high-performance electrodes for all-temperature energy storage applications.展开更多
基金This work is supported by the National Natural Science Foundation of China(Nos.51972142 and 52202237)We would like to thank the support from the Department of Science and Technology of Jilin Province with No.20220201118GXWe also would like to thank the support from the Fundamental Research Funds for the Center Universities(No.JLUXKJC2021ZZ14).
文摘Nano-structure designs with conductive networks have been demonstrated as an efficient strategy to boost sodium storage properties for transition metal sulfides.Herein,an exquisite nanosheets self-assembled hierarchical flower-ball-like CuFeS_(2)embedded into the reduced graphene oxide(RGO)nanosheet matrix(F-CuFeS_(2)@RGO)is fabricated via a concise two-step solvothermal method.Such a well-designed architecture affords increased active reaction interfaces and enhanced mixed ionic/electronic conductivity.Meanwhile,the external RGO matrix can effectively alleviate the volume expansion and create a stable structure during long cycles.As a result,the composite material exhibits a high reversible capacity of 559 mAh·g^(-1)at 0.1 A·g^(-1),a superior rate capability of 455 mAh·g^(-1)at 5 A·g^(-1)and excellent cyclic stability with 96%capacity retention after 4800 cycles at 5 A·g^(-1),among the best in the state-of-the-art transition metal sulfide anodes.Especially,F-CuFeS_(2)@RGO delivers outstanding low-temperature performances with a high capacity retention of 100%and 91%at-20 and-40℃,respectively,over 200 cycles.The proposed hierarchical structure fabrication paves a new direction in the design of high-performance electrodes for all-temperature energy storage applications.
