【摘要】 以维生素C（VC）为还原剂,通过溶剂热还原法制备了纳米二氧化锡/三维大孔石墨烯复合负极材料（SnO₂/3DGr）。SEM和TEM测试表明,SnO₂/3DGr具有均匀分布的微米级孔隙,其中SnO₂晶粒尺寸为6⁸nm,且均匀分布在石墨烯片层表面。电化学测试表明所制备的SnO₂/3DGr复合电极材料具有优异的电化学性能,该材料在电流密度为100mA/g时,循环100周之后仍然具有1678mAh/g的可逆比容量,在极高电流密度5A/g下,仍然保持405mAh/g的可逆比容量,表现出非常优异的循环稳定性和倍率性能。该材料独特的三维大孔结构以及SnO₂与石墨烯的协同作用,很好地抑制了SnO₂在循环过程中的体积效应,大大改善了SnO₂负极材料的电化学性能。更多还原

【Abstract】 Three dimensional macroporous nano-SnO₂/graphene composite（SnO₂/3DGr）was prepared using vitamin C as reducing agent via a facile two-step solvothermal method.SEM and TEM characterizations show that SnO₂ nanocrystals with particle size of 6-8nm are homogenously dispersed on the graphene nanosheets of the SnO₂/3DGr composite.The asprepared SnO₂/3DGr composite electrode exhibits excellent cycling stability and rate capability,which retains a reversible specific capacity of 1678mAh/g after 100 cycles at a current density of 100mA/g,and even at a very high current density of5A/g,still displays a reversible capacity of 405mAh/g.The outstanding electrochemical performance of the SnO₂/3D Gr composite could be credit to its unique three dimensional maocroporous structure and the synergistic effect between SnO₂ nanoparticles and graphene,which greatly hinders the volume expansion of SnO₂ upon cycling.更多还原