文章摘要
姚金环,谢志平,尹周澜,李延伟.V2O5/Graphene复合电极材料的制备与储锂性能[J].精细化工,2018,35(5):0
V2O5/Graphene复合电极材料的制备与储锂性能
Preparation and Lithium Storage Performance of V2O5/Graphene Composite Electrode Material
投稿时间:2017-03-19  修订日期:2017-08-17
DOI:
中文关键词: V2O5  石墨烯  正极材料  锂离子电池  电化学性能
英文关键词: V2O5  graphene  cathode materials  lithium ion batteries  electrochemical performance
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
姚金环 桂林理工大学 yaojinhuan@126.com 
谢志平 Guilin University of Technology  
尹周澜 Central South University  
李延伟 桂林理工大学 lywhit@126.com 
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中文摘要:
      采用简便的溶胶凝胶法制备了V2O5/石墨烯复合电极材料。利用SEM、XRD、Raman和TGA表征了样品的微观结构,以V2O5/石墨烯复合材料和Li4Ti5O12分别作为正极和负极组装了V2O5/石墨烯 // Li4Ti5O12全电池。结果表明,该复合电极材料是含有0.55%(质量分数)石墨烯的片状正交相V2O5。电化学测试表明,与未复合石墨烯的纯V2O5样品相比,V2O5/石墨烯复合材料具有更高的储锂活性和优异的大电流放电性能。在200 mA/g的电流密度下,V2O5/石墨烯复合材料和纯V2O5样品的放电比容量分别为283 mAh/g和253 mAh/g;当电流密度增加到5 A/g时,V2O5/石墨烯复合材料依然保持有150 mAh/g的放电比容量,而纯V2O5样品的放电比容量仅为114 mAh/g;V2O5/石墨烯和纯V2O5电极的电荷传递电阻分别为142 Ω和293 Ω。V2O5/石墨烯 // Li4Ti5O12全电池测试结果表明,在1.0 ~2.5 V电压范围内,循环初期全电池正极材料的放电比容量从110 mAh/g衰减到96 mAh/g,随后又出现上升,循环100次后正极材料的放电比容量稳定在102 mAh/g,库伦效率接近100%,这表明该V2O5/石墨烯复合电极材料是一种非常有应用前景的锂离子电池电极活性材料。
英文摘要:
      V2O5/Graphene composite material was prepared by a facile sol-gel method. The microstructure of the prepared sample was characterized by SEM, XRD, Raman spectroscope, and TGA. V2O5/Graphene // Li4Ti5O12 full-cell was assembled using the V2O5/Graphene composite and Li4Ti5O12 as cathode active material and anode active material, respectively. The results demonstrated that the V2O5/Graphene composite contained 0.55% graphene and had a two-dimensional sheet-like morphology with orthorhombic phase structure. Electrochemical characterizations revealed that the V2O5/Graphene composite exhibited higher lithium storage activity and better high rate capability than the pure V2O5 counterpart. At a current density of 200 mA/g, the V2O5/Graphene composite delivered a discharge capacity of 283 mAh/g, while that for the pure V2O5 was only 253 mAh/g; at a high current density of 5 A/g, the V2O5/Graphene showed a discharge capacity of 150 mAh/g, whereas that for the pure V2O5 was only 114 mAh/g. The charge transfer resistance of the V2O5/Graphene composite was142 Ω, which is much lower than that (293.3 Ω) of the pure V2O5 counterpart. In a voltage range of 1.0 V~2.5 V, the V2O5/Graphene // Li4Ti5O12 full-cell initially show a capacity decrease from 110 mAh/g to 96 mAh/g, then the capacity increases slowly and stabilized about 102 mAh/g in the 100th cycle; the coulomb efficiency during charge/discharge cycles is closed to 100%, suggesting the V2O5/Graphene composite is a promising cathode material for lithium-ion batteries.
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