新型工业化
新型工業化
신형공업화
New Industrialization Straregy
2015年
7期
29-33
,共5页
三维石墨烯%复合正极材料%锂硫电池%循环性能
三維石墨烯%複閤正極材料%鋰硫電池%循環性能
삼유석묵희%복합정겁재료%리류전지%순배성능
Three-dimensional graphene%Composite cathode material%Lithium-sulfur batteries%Cycle performance
以天然石墨粉为原料，采用改进的Hummers法制备氧化石墨烯，再通过水热还原、熔融升华法制备得到三维石墨烯/硫二元复合正极材料。对三维石墨烯/硫复合正极材料进行微观形貌和电化学性能的表征，结果显示：石墨烯具有三维多孔网状结构，能有效增加活性物质硫的利用率，并且硫均匀地负载在三维石墨烯的孔道和表面，没有发生团聚现象；电化学性能结果显示：三维石墨烯/硫复合正极材料在C/8电流密度下首次充放电容量为800mAh/g，40周次循环后容量还保持在600mAh/g左右，表明三维石墨烯/硫复合正极材料具有优异的循环与倍率性能。
以天然石墨粉為原料，採用改進的Hummers法製備氧化石墨烯，再通過水熱還原、鎔融升華法製備得到三維石墨烯/硫二元複閤正極材料。對三維石墨烯/硫複閤正極材料進行微觀形貌和電化學性能的錶徵，結果顯示：石墨烯具有三維多孔網狀結構，能有效增加活性物質硫的利用率，併且硫均勻地負載在三維石墨烯的孔道和錶麵，沒有髮生糰聚現象；電化學性能結果顯示：三維石墨烯/硫複閤正極材料在C/8電流密度下首次充放電容量為800mAh/g，40週次循環後容量還保持在600mAh/g左右，錶明三維石墨烯/硫複閤正極材料具有優異的循環與倍率性能。
이천연석묵분위원료，채용개진적Hummers법제비양화석묵희，재통과수열환원、용융승화법제비득도삼유석묵희/류이원복합정겁재료。대삼유석묵희/류복합정겁재료진행미관형모화전화학성능적표정，결과현시：석묵희구유삼유다공망상결구，능유효증가활성물질류적이용솔，병차류균균지부재재삼유석묵희적공도화표면，몰유발생단취현상；전화학성능결과현시：삼유석묵희/류복합정겁재료재C/8전류밀도하수차충방전용량위800mAh/g，40주차순배후용량환보지재600mAh/g좌우，표명삼유석묵희/류복합정겁재료구유우이적순배여배솔성능。
Three-dimensional graphene/sulfur (3DG/S) binary composite cathode materials are prepared by modified Hummers method, hydrothermal reduction and melting sublimation method using natural graphite powder as precursors. 3DG/S composite cathode materials are characterized by SEM and the electrochemical test. SEM results show that graphene has a three-dimensional porous structure, which can effectively inprove the utilization of the active substance sulfur, and the sulfur evenly distributes in the composites with no reunion pheDIAO Yu, TANG Hou-rui , LV Pengosites can deliver the highest discharge capacity of 800mAh/g in C/8 current density at the first cycle, keeping 600mAh/g after 40 cycles of charge-discharge, and indicated that 3DG/S composite cathode materials have the excellent cycle and rate performance.
