CAJ | 학술논문

针对锂离子电池体系，以提高负极材料可逆充放电容量为目的，制备了Fe2 O3‐石墨烯纳米复合材料，并利用XRD、SEM 对其结构和形貌进行了表征分析，通过恒流充放电测试对其电化学性能进行系统研究。采用水热法成功制备了二元的 Fe2 O3‐石墨烯纳米复合材料，纳米Fe2 O3分布较为均匀，形貌多为菱形块状或类球状多面体，且与石墨烯片相互交叠，有效抑制了双方的团聚，形成了有利于储锂的堆砌结构。电化学性能测试表明，Fe2 O3‐石墨烯纳米复合材料的储锂性能大大优于石墨烯和纳米 Fe2 O3，30次循环后，可逆容量仍高达1252mAh／g，循环性能优异；随着石墨烯加入量的增大，Fe2 O3‐石墨烯纳米复合材料的可逆容量越高。
침대리리자전지체계，이제고부겁재료가역충방전용량위목적，제비료Fe2 O3‐석묵희납미복합재료，병이용XRD、SEM 대기결구화형모진행료표정분석，통과항류충방전측시대기전화학성능진행계통연구。채용수열법성공제비료이원적 Fe2 O3‐석묵희납미복합재료，납미Fe2 O3분포교위균균，형모다위릉형괴상혹류구상다면체，차여석묵희편상호교첩，유효억제료쌍방적단취，형성료유리우저리적퇴체결구。전화학성능측시표명，Fe2 O3‐석묵희납미복합재료적저리성능대대우우석묵희화납미 Fe2 O3，30차순배후，가역용량잉고체1252mAh／g，순배성능우이；수착석묵희가입량적증대，Fe2 O3‐석묵희납미복합재료적가역용량월고。
The graphene and Fe2 O3‐graphene nanocomposite were prepared to improve the reversible specific ca‐pacities of anode materials for lithium‐ion batteries .The XRD and SEM were adopted to characterize the micro‐structure and morphology of the as‐prepared materials .The electrochemical performance of as‐prepared compos‐ites was investigated by galvanostatic discharged and charged test in detail .Fe2 O3‐graphene nanocomposite was prepared by hydrothermal method to improve the lithium storage capacity .The results show that Fe2 O3 nanop‐articles were successfully deposited onto the surfaces of graphene sheets ,and Fe2 O3 nanoparticles which had a uniformly cubical or spherical morphology .Electrochemical tests show that Fe2 O3‐graphene nanocomposite pos‐sesses higher reversible capacity than graphene or Fe2 O3 nanoparticles due to formation of a microporous struc‐ture between graphene and Fe2 O3 nanoparticles for lithium storage .The reversible capacity of Fe2 O3‐graphene nanocomposite still was 1 252 mAh/g after 30 cycles .The more increase of grephene ,the higher reversible ca‐pacity of Fe2 O3‐graphene nanocomposite was obtained .In addition ,Fe2 O3‐graphene nanocomposite has an ex‐cellent cycle performance and rate performance under high current density .