Effects of Cr-doping on structure and electrochemical performance of lithiumand manganese-rich cathode materials Li1.2Ni0.2Mn0.6O2

doi:10.11949/j.issn.0438-1157.20160875

Abstract

Abstract:

Lithium-ion battery cathode materials Li_1.2Ni_0.2Mn_0.2-x/2Mn_0.6-x/2Cr_xO₂(x=0, 0.04, 0.08, 0.12) were synthesized by co-precipitation and high temperature solid state reaction.The structure, morphology and electrochemical properties of cathode material, which was doped with different amounts of Cr, were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), galvanostatic charge-discharge testing and electrochemical impedance spectroscopy(EIS).The results show that the cathode materials Li_1.2Ni_0.2Mn_0.2-x/2Mn_0.6-x/2Cr_xO₂ display the layered structure of solid solution.Cr-doping does not change the material structure, and stabilizes the host layered structure by prohibiting the speed of spinel structure formation during cycling.Li_1.2Ni_0.16Mn_0.56Cr_0.08O₂ has the best electrochemical properties.The first discharge specific capacity of Li_1.2Ni_0.16Mn_0.56Cr_0.08O₂ is 246.6 mA·h·g^-1at 0.1C, while Li_1.2Ni_0.2Mn_0.6O₂ is 230.4 mA·h·g^-1.The capacity retaining ratio is improved from 93.5% to 95.36% after 50 cycles at 0.2C.The discharge capacity of Li_1.2Ni_0.16Mn_0.56Cr_0.08O₂ is 104.2 mA·h·g^-1 at 5C, while that of pristine is about 91.5 mA·h·g^-1.EIS results show that Li_1.2Ni_0.16Mn_0.56Cr_0.08O₂ has the lowest charge transfer impedance.

Key words: lithium-ion battery, cathode material, lithium-and manganese-rich, Li_1.2Ni_0.2Mn_0.6O₂, Cr-doping

摘要：

采用共沉淀-高温固相合成法制备锂离子电池正极材料Li_1.2Ni_0.2Mn_0.2-x/2Mn_0.6-x/2Cr_xO₂（x=0，0.04，0.08，0.12）。利用X射线衍射（XRD）、扫描电镜（SEM）、恒电流充放电测试和电化学交流阻抗谱（EIS）对掺杂不同Cr含量的正极材料的结构、形貌和电化学性能进行分析测试。结果表明：制备出的Li_1.2Ni_0.2Mn_0.2-x/2Mn_0.6-x/2Cr_xO₂正极材料均具备层状固溶体结构。Cr掺杂不会改变材料的结构，而且能够有效抑制循环过程中材料由层状向尖晶石结构转变的过程。当Cr的掺杂量为8%（即x=0.08）时，得到的正极材料Li_1.2Ni_0.16Mn_0.56Cr_0.08O₂具有最好的电化学性能。0.1C的首次放电比容量由未掺杂的230.4 mA·h·g^-1增加到246.6 mA·h·g^-1，在0.2C电流下50次循环后的容量保持率由93.5%提高至95.36%，5C的放电比容量由91.5 mA·h·g^-1增加到104.2 mA·h·g^-1。而且x=0.08时制备的样品具有最小的电荷转移阻抗。

关键词: 锂离子电池, 正极材料, 富锂锰基, Li_1.2Ni_0.2Mn_0.6O₂, Cr掺杂

CLC Number:

TM912.9

ZHANG Zhiqiang, ZHENG Shengquan, WANG Qiliang, DOU Aichun, SU Mingru, LIU Yunjian. Effects of Cr-doping on structure and electrochemical performance of lithiumand manganese-rich cathode materials Li_1.2Ni_0.2Mn_0.6O₂[J]. CIESC Journal, 2017, 68(1): 398-407.

张志强, 征圣全, 王起亮, 窦爱春, 苏明如, 刘云建. Cr掺杂对富锂锰基正极材料Li_1.2Ni_0.2Mn_0.6O₂结构和电化学性能的影响[J]. 化工学报, 2017, 68(1): 398-407.

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Effects of Cr-doping on structure and electrochemical performance of lithiumand manganese-rich cathode materials Li_1.2Ni_0.2Mn_0.6O₂

Cr掺杂对富锂锰基正极材料Li_1.2Ni_0.2Mn_0.6O₂结构和电化学性能的影响

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