基于阵列夹层纳米结构的稳定性和石墨烯的电子传递特性,本文通过原位生长的层间组装过程,获得了一类新型的rGO/Sn_2Fe-NRs阵列/rGO层间纳米结构复合材料.该结构中,Sn_2Fe纳米合金棒阵列排布于rGO纳米层之间.将此材料应用于锂离子电池负...基于阵列夹层纳米结构的稳定性和石墨烯的电子传递特性,本文通过原位生长的层间组装过程,获得了一类新型的rGO/Sn_2Fe-NRs阵列/rGO层间纳米结构复合材料.该结构中,Sn_2Fe纳米合金棒阵列排布于rGO纳米层之间.将此材料应用于锂离子电池负极,可以促进电极反应中的物质传输,并能有效避免副反应产生,从而表现出优异的倍率性和循环稳定性,并在高电流密度下保持高比容量.在电流密度分别为0.5C(500 mA g^(-1))和1C(1000 mA g^(-1))时,比容量分别达到690 mA h g^(-1)和582 mA h g^(-1).本工作对促进电化学性能优异的锂离子电池负极材料发展具有重要的意义.展开更多
Conversion/alloying anode materials exhibiting high K storage capacities suffer from large volume variations and unstable electrode/electrolyte interfaces upon cycling.Herein,taking SnS/reduced graphene oxide(SnS/rGO)...Conversion/alloying anode materials exhibiting high K storage capacities suffer from large volume variations and unstable electrode/electrolyte interfaces upon cycling.Herein,taking SnS/reduced graphene oxide(SnS/rGO)anodes as an example,the electrochemical performance of SnS/rGO could significantly be improved via employing potassium bis(fluorosulfonyl)imide(KFSI)salt in electrolytes and ultrathin TiO_(2) coating.KF-rich inorganic layer was demonstrated to help form robust SEI layer,which could suppress the side reactions to increase the Coulombic efficiency.The formed potassiated K_(x)TiO_(2) coating layer was constructed to boost charge transfer capability and K-ion diffusion kinetics.The as-prepared SnS/rGO@TiO_(2)-20 electrode in KFSI electrolyte delivers the high CE of 99.1%and 424 mAh·g^(−1) after 200 cycles with an ultrahigh capacity retention of 98.5%.展开更多
基金supported by the National Natural Science Foundation of China(21171130,51271132 and 91122025)the National Basic Research Program of China(2011CB932404)
文摘基于阵列夹层纳米结构的稳定性和石墨烯的电子传递特性,本文通过原位生长的层间组装过程,获得了一类新型的rGO/Sn_2Fe-NRs阵列/rGO层间纳米结构复合材料.该结构中,Sn_2Fe纳米合金棒阵列排布于rGO纳米层之间.将此材料应用于锂离子电池负极,可以促进电极反应中的物质传输,并能有效避免副反应产生,从而表现出优异的倍率性和循环稳定性,并在高电流密度下保持高比容量.在电流密度分别为0.5C(500 mA g^(-1))和1C(1000 mA g^(-1))时,比容量分别达到690 mA h g^(-1)和582 mA h g^(-1).本工作对促进电化学性能优异的锂离子电池负极材料发展具有重要的意义.
基金the Fundamental Research Funds for the Central Universities(Nos.19CX05002A and 17CX02039A)the Project of Science and Technology of Chongzuo City(FA2020008)+2 种基金the Key Research and Development Plan of Shandong Province(2018GGX102017)the New Faculty Start-up Funding in the China University of Petroleum(East China)(YJ201601023)the Special Project Fund of“Taishan Scholars”of Shandong Province(ts201511017).
文摘Conversion/alloying anode materials exhibiting high K storage capacities suffer from large volume variations and unstable electrode/electrolyte interfaces upon cycling.Herein,taking SnS/reduced graphene oxide(SnS/rGO)anodes as an example,the electrochemical performance of SnS/rGO could significantly be improved via employing potassium bis(fluorosulfonyl)imide(KFSI)salt in electrolytes and ultrathin TiO_(2) coating.KF-rich inorganic layer was demonstrated to help form robust SEI layer,which could suppress the side reactions to increase the Coulombic efficiency.The formed potassiated K_(x)TiO_(2) coating layer was constructed to boost charge transfer capability and K-ion diffusion kinetics.The as-prepared SnS/rGO@TiO_(2)-20 electrode in KFSI electrolyte delivers the high CE of 99.1%and 424 mAh·g^(−1) after 200 cycles with an ultrahigh capacity retention of 98.5%.
