The low initial Coulombic efficiency(ICE)is a significant problem hindering the practical uses of carbon anodes in sodium-ion batteries(SIBs),especially for the carbons with large surface area.Presodiation is an effec...The low initial Coulombic efficiency(ICE)is a significant problem hindering the practical uses of carbon anodes in sodium-ion batteries(SIBs),especially for the carbons with large surface area.Presodiation is an effective way to solve the above problem,but it always needs complicated operations and cannot suppress the unavoidable electrolyte decomposition in the assembled battery.Herein,we develop an ultrafast chemical presodiation method for reduced graphene oxide(rGO)using sodium naphthalene(Na-Nt)dissolved in dimethoxyethane(DME)solvent as a presodiation reagent.The presodiation effectively improves the ICE of rGO to 96.8%and forms an artificial solid electrolyte interphase(SEI)on its surface due to the decomposition of the formed complex between Na+and DME.The formed artificial SEI suppresses the excessive decomposition of electrolytes in the assembled battery,leading to a formation of uniform and inorganic component–rich SEI on rGO surface,which enables a rapid interfacial ion transfer.Therefore,the presodiated rGO showed excellent rate performance with a high capacity of 198.5 mAh g^(-1) at 5 A g^(-1).Moreover,excellent cycle stability indicated by the high capacity retention of 68.4%over 1000 cycles was also achieved,showing the poten-tial to promote the practical uses of high-rate rGO anode in SIBs.展开更多
基金Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program,Grant/Award Number:2017BT01N111Guangdong Special Support Program,Grant/Award Number:2017TQ04C664+3 种基金National Key Research and Development Program of China,Grant/Award Number:2018YFE0124500National Natural Science Foundation of China,Grant/Award Numbers:51972190,52022041Shenzhen Basic Research Project,Grant/Award Numbers:JCYJ20180508152019687,JCYJ20180508152037520Shenzhen Graphene Manufacturing Innovation Center,Grant/Award Number:201901161513。
文摘The low initial Coulombic efficiency(ICE)is a significant problem hindering the practical uses of carbon anodes in sodium-ion batteries(SIBs),especially for the carbons with large surface area.Presodiation is an effective way to solve the above problem,but it always needs complicated operations and cannot suppress the unavoidable electrolyte decomposition in the assembled battery.Herein,we develop an ultrafast chemical presodiation method for reduced graphene oxide(rGO)using sodium naphthalene(Na-Nt)dissolved in dimethoxyethane(DME)solvent as a presodiation reagent.The presodiation effectively improves the ICE of rGO to 96.8%and forms an artificial solid electrolyte interphase(SEI)on its surface due to the decomposition of the formed complex between Na+and DME.The formed artificial SEI suppresses the excessive decomposition of electrolytes in the assembled battery,leading to a formation of uniform and inorganic component–rich SEI on rGO surface,which enables a rapid interfacial ion transfer.Therefore,the presodiated rGO showed excellent rate performance with a high capacity of 198.5 mAh g^(-1) at 5 A g^(-1).Moreover,excellent cycle stability indicated by the high capacity retention of 68.4%over 1000 cycles was also achieved,showing the poten-tial to promote the practical uses of high-rate rGO anode in SIBs.
基金supported by the National Natural Science Foundation of China (51772164 and U1601206)Guangdong Natural Science Funds for Distinguished Young Scholar (2017B030306006)+2 种基金Guangdong Special Support Program (2017TQ04C664)Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01N111)Shenzhen Technical Plan Project (JCYJ20170412171630020 and JCYJ20170412171359175)
