高亮,张敏刚,郝豫宝,闫时建,郭锦,李英杰

• 1:太原科技大学

摘要(Abstract)：

研究了以快离子导体Li_(0.5)La_(0.5)TiO_3(LLTO)包覆的LiFePO_4正极材料的锂离子电池的电化学性能。采用溶剂热法制备锂电池正极材料LiFePO_4,再采用溶胶凝胶法制备的LLTO粉体对LiFePO_4进行包覆,包覆量为LiFePO_4质量分数的1%~4%.通过进行充放电测试、交流阻抗测试及循环伏安测试,研究了不同包覆量对电池的充放电比容量、循环性能及可逆性的影响。发现当LLTO含量为3 wt%,2 C、5 C时,充放电时相对于没有包覆LLTO的电池正极材料的比容量分别提高29.7%、31.6%,30次循环之后,容量损失率减小4.13%,循环伏安曲线上氧化还原峰之间的电位差仅为0.117 V,以3 wt%的LLTO包覆改性LiFePO_4显著提高了电池的电化学性能。

关键词(KeyWords)： 锂离子电池;LiFePO4;Li0.5La0.5TiO3;表面包覆

Abstract:

Keywords:

基金项目(Foundation): 山西省科技平台建设项目(2015091011);; 晋城市科技计划项目(201501004-21);; 太原市科技计划项(110153)

作者(Author): 高亮,张敏刚,郝豫宝,闫时建,郭锦,李英杰

参考文献(References)：

• [1]李瑾,张宇,李景霖,等.磷酸铁锂电池在变电站系统应用的可行性分析[J].华东电力,2009,37(10):1693-1697.
• [2]王少江,何秋生,许亚朝,等.一种改进的锂电池PNGV模型研究[J].太原科技大学学报,2016,37(2):114-118.
• [3]ZHANG W J.Structure and performance of Li Fe PO4,cathode materials:A review[J].Journal of Power Sources,2011,196(6):2962-2970.
• [4]FEDORKOVA,ORIňKOVR,ORIňK A,et al.PPy doped PEG conducting polymer films synthesized on Li Fe PO4particles[J].Journal of Power Sources,2010,195(12):3907-3912.
• [5]TANG X C,LI L X,LAI Q L,et al.Investigation on diffusion behavior of Li+,in Li Fe PO4,by capacity intermittent titration technique(CITT)[J].Electrochimica Acta,2009,54(8):2329-2334.
• [6]LI Y D,ZHAO S X,NAN C W,et al.Electrochemical performance of Si O2-coated Li Fe PO4,cathode materials for lithium ion battery[J].Journal of Alloys and Compounds,2011,509(3):957-960.
• [7]XU J,CHEN G.Electrochemical Performance of Li Fe PO4Cathode Material Coated with Pb Te[J].Electrochemical&Solid State Letters,2009,12(11):H399-H401
• [8]BOYANO I,BLAZQUEZ J A,MEATZA I D,et al.Preparation of C-Li Fe PO4/polypyrrole lithium rechargeable cathode by consecutive potential steps electrodeposition[J].Journal of Power Sources,2010,195(16):5351-5359.
• [9]ZHANG W J,ZHANG W J.Comparison of the Rate Capacities of Li Fe PO4Cathode Materials[J].Journal of the Electrochemical Society,2010,157(10):A1040-A1046.
• [10]WANG H,YANG Y,IANG Y,et al.Li Mn(1-x)Fe(x)PO4nanorods grown on graphene sheets for ultrahigh-rate-performance lithium ion batteries[J].Angewandte Chemie,2011,50(1):1-6.
• [11]WANG B,WANG D,WANG Q,et al.Improvement of the electrochemical performance of carbon-coated Li Fe PO4modified with reduced graphene oxide[J].J.mater.chem.a,2013,1(1):135-144.
• [12]SHEN W,WANG Y,YAN J,et al.Enhanced Electrochemical Performance of Lithium Iron(II)Phosphate Modified Cooperatively via Chemically Reduced Graphene Oxide and Polyaniline[J].Electrochimica Acta,2015,173:310-315.
• [13]INAGUMA Y,CHEN L,ITOH M,et al.Candidate compounds with perovskite structure for high lithium ionic conductivity[J].Solid State Ionics,1994,70-71(1):196-202.
• [14]刘丽玉,邓元,梅骜,等.非氧化物锂盐与LLTO的复合以及性能研究[J].功能材料,2007(S4):1428-1430.
• [15]曹建梅,王学刚,李辛庚,等.LSC包覆改性Li Fe PO4/C锂电池正极材料特性研究[J].电源技术,2015,39(6):1186-1188.
• [16]BAI Y M,QIU P,WEN Z L,et al.Improvement of electrochemical performances of Li Fe PO4cathode materials by coating of polythiophene[J].Journal of Alloys and Compounds,2010,508(1):1-4.