LiFePO_4动力电池倍率性能的影响因素
|
摘要
利用X射线衍射(XRD)、扫描电子显微镜(SEM)、激光粒度分析仪、透气性测试仪和高性能动力电池测试柜对磷酸铁锂电池的负极材料、导电剂含量、隔膜和极耳结构进行表征,探究了各部分的特性对磷酸铁锂圆柱电池倍率性能的影响,并分析了磷酸铁锂电池中各组分与电池性能之间的对应作用机理。研究表明:适当增大石墨层间距、减小石墨颗粒粒径、增加正极活性物质中导电剂添加量、增大隔膜孔隙率、增加极耳数量来提升电子导通能力、降低全电池内阻,均有利于提高电池的倍率性能和循环性能。
The anode materials, cathode materials, separator and tab were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM), laser particle size analyzer, air permeability tester and battery testing system.The impacts of the high charge rate performance of LiFePO_4 cylindrical battery caused by these components were investigated. In addition, the relationship between the constituents and the performance was analyzed in this study.The results show that the charging rate and cycle performance can be enhanced by improving the layer spacing of graphite, increasing the content of conductive agent in the positive active material, enhancing the ability of electronic conduction and porosity of separator, reducing the size of graphite and the internal resistance of battery.
The anode materials, cathode materials, separator and tab were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM), laser particle size analyzer, air permeability tester and battery testing system.The impacts of the high charge rate performance of LiFePO_4 cylindrical battery caused by these components were investigated. In addition, the relationship between the constituents and the performance was analyzed in this study.The results show that the charging rate and cycle performance can be enhanced by improving the layer spacing of graphite, increasing the content of conductive agent in the positive active material, enhancing the ability of electronic conduction and porosity of separator, reducing the size of graphite and the internal resistance of battery.
引文
[1]PROSINI P P,CENTO C,POZIO A.Lithium-ion batteries based on titanium oxide nanotubes and LiFePO4[J].Journal of Solid State Electrochemistry.2014,18:795-804.
[2]QIU Y J,GENG Y H,YU J,et al.High-capacity cathode for lithium-ion battery from LiFePO4/(C+Fe2P)composite nanofibers by electrospinning[J].Journal of Materials Science,2014,49:504-509.
[3]LI W S.Research progresses on materials of lithium ion battery for energy storage[J].Advances in New and Renewable Energy,2013,1(1):95-105.
[4]CHANG H H,CHANG C C,SU C Y,et al.Effects of TiO2coating on high-temperature cycle performance of LiFePO4-based lithium-ion batteries[J].Journal of Power Sources,2008,185:466-472.
[5]YANG J,XU J J.Nonaqueous sol-gel synthesis of high-performance Li FePO4[J].Electrochemical and Solid-State Letters,2004,7(12):A515-A518.
[6]HU G R,GAO X G,PENG Z D,et al.Synthesis of LiFePO4/Ccomposite electrode with enhanced electrochemical performance[J].Transactions of Nonferrous Metals Society of China,2005,15(4):795-799.
[7]HARRISON K L,BRIDGES C A,PARANTHAMAN M P,et al.Temperature dependence of aliovalent-vanadium doping in Li FePO4cathodes[J].Chemistry of Materials,2013,25(5):768-781.
[8]LIM J,KANG S W,MOON J,et al.Low-temperature synthesis of LiFePO4nanocrystals by solvothermal route[J].Nanoscale Research Letters,2012,7(1):1-7.
[9]FAN J,CHEN J,CHEN Y,et al.Hierarchical structure Li FePO4@C synthesized byoleylamine-mediated method for low temperature applications[J].Journal of Materials A,2014,2:4870-4875.
[2]QIU Y J,GENG Y H,YU J,et al.High-capacity cathode for lithium-ion battery from LiFePO4/(C+Fe2P)composite nanofibers by electrospinning[J].Journal of Materials Science,2014,49:504-509.
[3]LI W S.Research progresses on materials of lithium ion battery for energy storage[J].Advances in New and Renewable Energy,2013,1(1):95-105.
[4]CHANG H H,CHANG C C,SU C Y,et al.Effects of TiO2coating on high-temperature cycle performance of LiFePO4-based lithium-ion batteries[J].Journal of Power Sources,2008,185:466-472.
[5]YANG J,XU J J.Nonaqueous sol-gel synthesis of high-performance Li FePO4[J].Electrochemical and Solid-State Letters,2004,7(12):A515-A518.
[6]HU G R,GAO X G,PENG Z D,et al.Synthesis of LiFePO4/Ccomposite electrode with enhanced electrochemical performance[J].Transactions of Nonferrous Metals Society of China,2005,15(4):795-799.
[7]HARRISON K L,BRIDGES C A,PARANTHAMAN M P,et al.Temperature dependence of aliovalent-vanadium doping in Li FePO4cathodes[J].Chemistry of Materials,2013,25(5):768-781.
[8]LIM J,KANG S W,MOON J,et al.Low-temperature synthesis of LiFePO4nanocrystals by solvothermal route[J].Nanoscale Research Letters,2012,7(1):1-7.
[9]FAN J,CHEN J,CHEN Y,et al.Hierarchical structure Li FePO4@C synthesized byoleylamine-mediated method for low temperature applications[J].Journal of Materials A,2014,2:4870-4875.