对LiFePO4/C复合前驱体,分别采用静态氮气气氛,动态氮气气氛及静态真空三种烧结方式进行碳热还原合成LiFePO4/C复合正极材料.采用XRD、SEM、CV和充放电循环测试等方法分析和表征材料的结构、形貌和电化学性能.结果表明,烧结方式对所得材料的结晶度、晶粒大小、碳含量、合成温度以及电化学性能均有显著影响.真空烧结所得材料结晶度高,而动态气氛烧结对材料颗粒细化及均匀化都有积极影响,同时也能有效促进锂离子扩散动力学.动态气氛烧结可将材料的烧结温度降低到500℃,且所得材料表现出优异的电化学性能.0.5C倍率下循环首次放电比容量达到163.4 mAh/g,50次循环后容量保持率为99.02％.
参考文献
| [1] | Padhi A K,Nanjundaswamy K S,Goodenough J B.Phosphoolivines as positive-electrode material for rechargeable lithium batteries.J.Electrochem.Soc.,1997,144(4):1188-1194. |
| [2] | Chen Z H,Ren Y,Qin Y,et al.Solid state synthesis of LiFePO4 studied by in situ high energy X-ray diffraction.J.Mater.Chem.,2011,21(15):5604-5609. |
| [3] | Gaberscek M,Dominko R,Bele M,et al.Porous,carbon-decorated LiFePO4 prepared by Sol-Gel method based on citric acid.Solid State Ionics,2005,176(19-22):1801-1805. |
| [4] | Beninati S,Damen L,Mastragostino M.Fast Sol-Gel synthesis of LiFePO4/C for high power lithium-ion batteries for hybrid electric vehicle application.J.Power Sources,2009,194(2):1094-1098. |
| [5] | Arnold G,Garche J,Hemmer R,et al.Fine-particle lithium iron phosphate LiFePO4 synthesized by a new low-cost aqueous precipitation technique.J.Power Sources,2003,247:119-121. |
| [6] | Chen J J,Whittingham M S.Hydrothermal synthesis of lithium iron phosphate.Electrochem.Commun.,2006,8(5):855-858. |
| [7] | Lou X M,Zhang Y X.Synthesis of LiFePO4/C cathode materials with both high-rate capability and high tap density for lithium-ion batteries.J.Mater.Chem.,2011,21(12):4156-4160. |
| [8] | LIU Su-Qin,GONG Ben-Li,ZHANG Ge,et al.Synthesis of LiFePO4/C composite cathode materials by a novel carbothermal reduction method and its performance.Journal of Inorganic Materials,2007,22(2):283-286. |
| [9] | Huang Y H,Ren H B,Peng Z H,et al.Synthesis of LiFePO4/carbon composite from nano-FePO4 by a novel stearic acid assisted theological phase method. Electrochim.Acta,2009,55(1):311-315. |
| [10] | Li P.He W,Zhao H S,Wang S P.Biomimetic synthesis and characterization of the positive electrode material LiFePO4.J.Alloys Compd.,2009,471(1/2):536-538. |
| [11] | Zhou W J,He W,Li Z M,et al.Biosynthesis and electrochemical characteristics of LiFePO4/C by microwave processing.J.Solid State Electrochem.,2009,13(12):1819-1823. |
| [12] | 刘素琴,龚本利,黄可龙,等(LIU Su-Qin,et al).焙烧温度对合成LiFePO4的产物组成和电化学性能的影响.物理化学学报(Acta Phys.Chim.Sin.),2007,23(7):1117-1122. |
| [13] | 赵彪,习小明,成定波,等.烧结温度对LiFePO4/C正极材料充放电性能的影响.矿冶工程,2008,28(1):64-75. |
| [14] | 郑俊超,李新海,王志兴,等.常温还原-低温热处理制备LiFePO4及性能研究.功能材料,2008,39:1843-1846. |
| [15] | Zhang D Y,Zhang P X,Yi J A,et al.XRD simulation study of doped LiFePO4.J.Alloys Compd.,2011,509(4):1206-1210. |
| [16] | Zhang L L,Peng G,Yang X L,et al.High performance LiFePO4/C cathode for lithium ion battery prepared under vacuum conditions.Vacuum,2010,84(11):1319-1322. |
| [17] | 张宝,李新海,朱炳权,等.沉淀-碳热还原联合法制备橄榄石磷酸铁锂.中国有色金属学报,2006,16(8):1446-1449. |
| [18] | Liu H,Zhang P,Li G C,et al.LiFePO4/C composites from carbothermal reduction method.J.Solid State Electrochem.,2008,12(7/8):1011-1015. |
| [19] | Kim J K,Cheruvally G,Choi J W,et al.Effect of mechanical activation process parameters on the properties of LiFePO4 cathode material.J.Power Sources,2007,166(1):211-218. |
| [20] | Cui Y,Zhao X L,Guo R S.High rate electrochemical performances of nanosized ZnO and carbon co-coated LiFePO4 cathode.Mater.Res.Bull.,2010,45(7):844-849. |
| [21] | 张琨,邓小川,王连亮,等.磷酸亚铁锂碳复合物中碳、铁、磷、含量的测定.盐湖研究,2009,17(3):48-55. |
| [22] | Kim C W,Park S P.Lee K S.Effect of Fe2P on the electron conductivity and electrochemical performance of LiFePO4 synthesized by mechanical alloying using Fe3+ raw material.J.Power Sources,2006,163(1):144-150. |
| [23] | Wang L,Liang G C,Ou X Q,et al.Effect of synthesis temperature on the properties of LiFePO4/C composites prepared by carbonthermal reuction.J.Power Sources.2009,189(1):423-428. |
| [24] | 陈晗,于文志,韩绍昌,等.LiFePO4的Pechini法合成及电化学性能研究.电源技术,2008,32(1):13-16. |
| [25] | Liu W H,Tu J P,Qiao Y Q,et al.Optimized performances of core-shell structured LiFePO4/C nanocomposite.J.Power Sources,2011,196(18):7728-7735. |
| [26] | Cho Y D,Fey G T K,Kao H M.The effect of carbon coating thickness on the capacity of LiFePO4/C composite cathodes.J.Power Sources,2009,189(1):256-262. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%