高镍系正极材料LiNi_(0.8)Co_(0.15)Al_(0.05)O_2的制备研究
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摘要
用共沉淀-高温固相法合成镍钴氢氧化物前驱体,加入过硫酸铵和改性石墨,对金属离子进行预氧化和电化学性能改性,再用硝酸铝掺杂的方式加入铝元素,并通过溶剂溶解和二次煅烧的方法使铝混合均匀,制得球形LiNi_(0.8)Co_(0.15)Al_(0.05)O_2正极材料。通过SEM、XRD和蓝电测试系统对材料进行表征和检测,具有良好的循环性能,在0.2 C下首次放电比容量达200.1 mAh/g,50次循环后容量保持率为86.67%。
Nickel cobalt hydroxide precursor was prepared by co-precipitation method and high temperature solid phase method. Adding ammonium persulfate and modified graphite to the precursor, the metal ions were pre-oxidized and its electrochemical properties were modified. The aluminum elements were added by doping aluminum nitrate, and through the method of solvent and twice calcinations, the aluminum was mixed uniformly.Finally, the spherical LiNi_(0.8)Co_(0.15)Al_(0.05)O_2cathode materials were prepared. The materials were characterized and tested by SEM, XRD, EDS and blue electrical test system. The results show that the materials have good cycle performance. The first discharge specific capacity is 200.1 mAh/g at 0.2 C, and the capacity retention rate is 86.67% after 50 cycles.
Nickel cobalt hydroxide precursor was prepared by co-precipitation method and high temperature solid phase method. Adding ammonium persulfate and modified graphite to the precursor, the metal ions were pre-oxidized and its electrochemical properties were modified. The aluminum elements were added by doping aluminum nitrate, and through the method of solvent and twice calcinations, the aluminum was mixed uniformly.Finally, the spherical LiNi_(0.8)Co_(0.15)Al_(0.05)O_2cathode materials were prepared. The materials were characterized and tested by SEM, XRD, EDS and blue electrical test system. The results show that the materials have good cycle performance. The first discharge specific capacity is 200.1 mAh/g at 0.2 C, and the capacity retention rate is 86.67% after 50 cycles.
引文
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[9]KIM C S,CHO J H,PARK Y J,et al.Electrochemical properties of Fe F3-coated Li Ni1/3Co1/3Mn1/3O2cathode material[J].Materials Research Bulletin,2014,58:49-53.
[10]邓丹丹,廖菊蓉,华美,等.Ti O2包覆Li Ni1/3Co1/3Mn1/3O2的高温与高倍率性能[J].电池,2012,42(2):74-76
[2]Majumder S B.Synthesis and electrochemical properties of Li Ni0.8-(Co0.02-xAlx)O2(x=0.0 and x=0.05)cathodes for Li-ion rechargeable batteries[J].Journal of Power Sources,2006,154:262-267.
[3]CHEN C H.Aluminum-doped lithium nickel cobalt oxide electrodes for high-power lithium-ion batteries[J].Journal of Power Sources,2004,128:278-285.
[4]YOON S,LEE C W,BAE Y S.Method of preparation for particle growth enhancement of Li Ni0.8Co0.15Al0.05O2[J].Electrochemical and Solid-State Letters,2009,12(11):A211-A214.
[5]PARK T J,LIM J B,SON J T.Effect of calcination temperature of size controlled microstructure of Li Ni0.8Co0.15Al0.05O2cathode for rechargeable lithium battery[J].Bull Korean Chem Soc,2014(35):2-10.
[6]CHEN Z H,WANG Q Z,AMINE K.Improving the performance of soft carbon for lithium-ion battery[J].Electrochimica Acta,2006,51:3890-3894.
[7]WINTER M,PASSERINI S,BALDUCCI A.On the use of soft carbon and propylene carbonate-based electrolytes in lithium-ion capacitors[J].Journal of the Electrochemical Society,2012,159(8):A1240-A1245.
[8]叶乃清,刘长久,沈上越.锂离子电池正极材料Li Ni O2存在的问题与解决办法[J].无机材料学报,2004,19(6):1217-1224.
[9]KIM C S,CHO J H,PARK Y J,et al.Electrochemical properties of Fe F3-coated Li Ni1/3Co1/3Mn1/3O2cathode material[J].Materials Research Bulletin,2014,58:49-53.
[10]邓丹丹,廖菊蓉,华美,等.Ti O2包覆Li Ni1/3Co1/3Mn1/3O2的高温与高倍率性能[J].电池,2012,42(2):74-76