(1. 遼寧工程技術(shù)大學 材料科學與工程學院，阜新 123000；
2. 遼寧工程技術(shù)大學 力學與工程學院，阜新 123000；
3. 遼寧工程技術(shù)大學 礦物材料與清潔轉(zhuǎn)化研究院，阜新 123000；
4. 國家電投集團 東方新能源股份有限公司，石家莊 050031)
摘 要: 正極材料的穿梭效應和導電性能是限制鋰硫電池發(fā)展與應用的重要因素。針對以上問題，采用水熱法制備了Fe2O3/rGO載硫體，并與rGO和Fe2O3@rGO載硫體進行對比。利用X射線衍射儀、掃描電子顯微鏡、比表面積分析儀以及電化學性能測試等分析測試手段對材料的物相組成、微觀結(jié)構(gòu)以及電化學性能進行分析表征。結(jié)果表明：采用原位法制備的Fe2O3/rGO復合材料中Fe2O3顆粒尺寸明顯比機械混合法制備的Fe2O3@rGO中的Fe2O3顆粒尺寸小，其中納米Fe2O3的生成阻礙了rGO片層的聚集，增大了層間距，獲得了更大的孔徑(8 nm)、孔容積和比表面積。制備的正極材料Fe2O3/rGO/S具有更好的循環(huán)穩(wěn)定性，在0.2C電流密度下，經(jīng)過100次循環(huán)后，仍保留782 mA？h/g的容量。電化學性能的提高得益于Fe2O3/rGO大的比表面積以及良好的阻抗性能。
關(guān)鍵字: 鋰硫電池；石墨烯；Fe2O3；正極材料；載硫體
（1. College of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, China;
2. School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China;
3. Institute of Mineral Material and Clean Transformation, Liaoning Technical University, Fuxin 123000, China;
4. Dong Fang New Energy Corporation, State Power Investment Company, Shijiazhuang 050031, China）
Abstract:The shuttle effect and electrical conductivity of lithium-sulfur battery cathode materials are important factors that limit the development and application of lithium-sulfur batteries. In response to the above problems, the Fe2O3/rGO sulfur-carrier was prepared by hydrothermal method, and rGO and Fe2O3@rGO sulfur-carriers were prepared for comparison. The phase composition, microstructure and electrochemical properties of the materials were characterized by means of X-ray diffractometer, scanning electron microscope, specific surface area analyzer and electrochemical performance test. The results show that the size of Fe2O3 particles in Fe2O3/rGO composites prepared by in-situ method is significantly lower than that of Fe2O3@rGO prepared by mechanical mixing method. The formation of nano Fe2O3 hinders the aggregation of rGO layers, increases the interlayer spacing and obtains larger pore size (8 nm), pore volume and specific surface area. The prepared cathode material of Fe2O3/rGO/S has better cycle stability at a current density of 0.2C. After 100 cycles, the remaining capacity is 782 mA？h/g. The improvement of electrochemical performance is attributed to the large pore volume and good impedance performance of Fe2O3/rGO.
Key words: lithium-sulfur battery; graphene; Fe2O3; cathode material; sulfur-carrier
