采用水热法制备了锂离子电池正极材料纯LiV3O8和LiV3O8/V2O5复合物,通过X射线衍射、扫描电子显微镜和比表面积测定等测试手段,对所制备样品的结构和形貌进行了表征和分析.结果表明,当n(Li)∶n(V)=1∶3.4时,所制备的复合物化学组成为LiV3O8 ·0.2V2O5,V2O5的掺杂增大了复合物中LiV3O8的层间距.SEM观察表明,纯LiV3O8样品由片状晶粒堆积形成聚集体,层间无空隙.而复合物中片状晶粒层间形成了大量的孔洞.复合物的多孔结构可望提高电解液在电极材料中的渗透程度,有利于锂离子的嵌脱反应.循环性能测试结果表明,复合物具有更高的初始放电容量和更好的循环性能.
参考文献
| [1] | Fergus J W.Recent Developments in Cathode Materials for Lithium Ion Batteries[J].J Power Source,2010,195(4):939-954. |
| [2] | Liu Z L,Wang H B,Fang L,et al.Improving the High Temperature Performance of LiMn2O4 Spinel by Micro-Emulsion Coating of LiCoO2[J].J Power Sources,2002,104(1):101-107. |
| [3] | REN Xiangzhong,JIANG Yingkai,ZHANG Peixin,et al.Effect of Composite Modes on Structure and Electrochemical Performance of V2 O5/PPy[J].Chinese Polym Mater Sci Eng,2010,26 (7):59-62 (in Chinese).任祥忠,江英凯,张培新,等.复合方式对V2O5/PPy的结构及电化学性能的影响[J].高分子材料科学与工程,2010,26(7):59-62. |
| [4] | Zhao M,Jiao L F,Yuan H T,et al.Study on the Silicon Doped Lithium Trivanadate as Cathode Material for Rechargeable Lithium Batteries[J].Solid State Ionics,2007,178(5/6):387-391. |
| [5] | Chen Y,Liu H,Ye W L.Preparation and Electrochemical Properties of Submicron Spherical V2O5 as Cathode Material for Lithium Ion Batteries[J].Scripta Mater,2008,59(3):372-375. |
| [6] | Kawakita J,Katagiri H,Miura T,et al.Lithium Insertion Behaviour of Manganese or Molybdenum Substituted Li1+x V3O8[J].J Power Sources,1997,68(2):680-685. |
| [7] | Si Y C,Jiao L F,Yuan H T,et al.Structural and Electrochemical Properties of LiV3O8 Prepared by Combustion Synthesis[J].J Alloys Compd,2009,486(1/2):400-405. |
| [8] | Liu L,Jiao L F,Sun J L,et al.Electrochemical Properties of Submicron-sized LiV3O8 Synthesized by a Low-temperature Reaction Route[J].J Alloys Compd,2009,471 (1/2):352-356. |
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