journal6 ›› 2011, Vol. 32 ›› Issue (1): 88-92.

• 化学化工 • 上一篇    下一篇

正极材料Li(Ni1/3Co1/3Mn1/3)1-xCrxO2的合成与表征

  

  1. (1.生态旅游应用技术湖南省重点实验室,湖南 吉首 416000;2.吉首大学化学化工学院,湖南 吉首 416000)
  • 出版日期:2011-01-25 发布日期:2012-04-10
  • 作者简介:梁凯(1985-),男,湖南常德人,吉首大学化学化工学院硕士研究生,主要从事功能材料研究.
  • 基金资助:

    国家自然科学基金资助项目(20873054);国家高技术研究发展计划(863计划)重点项目子课题(2010AA065205);湖南省教育厅科学研究项目(10A098);生态旅游应用技术湖南省重点实验室开放基金项目(10stlvzd06);吉首大学林产化工工程湖南省重点实验室开放基金项目资助(JDZ200907);吉首大学大学生研究性学习和创新性实验计划项目资助(JSU-CX-2010-55)

Synthesis and Performance of Li(Ni1/3Co1/3Mn1/3)1-xCrxO2 Anode Materials of Lithium-Ion Battery

  1.  (1.Hunan Key Lab of Bio-Tourism Application Technology,Jishou 416000,Hunan China;2.College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2011-01-25 Published:2012-04-10

摘要:采用草酸盐共沉淀法合成一系列的Li(Ni1/3Co1/3Mn1/3)1-xCrxO2正极材料(0 ≤x ≤0.1),用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析合成产物的晶体结构及表面形貌;利用充放电仪测定了产物的电化学性能.结果表明,合成的Li(Ni1/3Co1/3Mn1/3)1-xCrxO2( x = 0.01,0.03,0.05,0.07) 均保持α-2NaFeO2 层状结构相,属于空间R3m点群.Li(Ni1/3Co1/3Mn1/3)0.95Cr0.05O2的电化学性能最佳,首次放电容量达158.6 mAh/g,在2.5~4.5 V区间30次循环后比容量衰竭率仅为3.92%.Li(Ni1/3Co1/3Mn1/3)0.95Cr0.05O2和Li(Ni1/3Co1/3Mn1/3)CrO2 的电极阻抗变化不同,进而影响其电化学性能.

关键词: 锂离子电池, 正极材料, 掺杂, 电化学性能

Abstract: A series of Li(Ni1/3Co1/3Mn1/3)1-xCrxO2 (0≤x≤0.1) samples were prepared as anode materials of lithium-ion battery by using oxalate co-precipitation method.The crystal structure and surface morphologies of the products were analyzed by means of X-ray diffraction(XRD)and scanning electron microscopy (SEM) methods.The electrochemical performance of Li(Ni1/3Co1/3Mn1/3)1-xCrxO2  was evaluated by charge/discharge tests.Results show that Li(Ni1/3Co1/3Mn1/3)1-xCrxO2(x=0.01,0.03,0.05,0.07) keeps bedded structure of α-2NaFeO2 and have cubic structure of phase R3m,The Li(Ni1/3Co1/3Mn1/3)0.95Cr0.05O2 has the best electrochemical performance,an initial discharge capacity of 158.6 mAh/g and the capacity fade is only 3.92 % after 30 cycles of charge-discharge within 2.5~4.5 V.The electrochemical circulation mechanism of the products was analyzed by means of ac impedance methods.Besides,Li(Ni1/3Co1/3Mn1/3)0.95Cr0.05O2 and Li(Ni1/3Co1/3Mn1/3)CrO2  electrodes had different changes of impedance,leading to different effects on the electrochemical performance.

Key words: lithium-ion battery, anode materials, mix, performance

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