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

ZHANG Zhiqiang; ZHENG Shengquan; WANG Qiliang; DOU Aichun; SU Mingru; LIU Yunjian

doi:10.11949/j.issn.0438-1157.20160875

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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

更新时间：2025-11-26

- Effects of Cr-doping on structure and electrochemical performance of lithiumand manganese-rich cathode materials Li_1.2Ni_0.2Mn_0.6O₂
- CIESC Journal Issue 1, Pages: 398-407(2017)
- 作者机构：
  
  江苏大学材料科学与工程学院,江苏,镇江,212013
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160875
  CLC： M912.9
- Online First：05 January 2017，
  
  Published：05 January 2017
- 稿件说明：
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ZHANG Zhiqiang, ZHENG Shengquan, WANG Qiliang, et al. 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, (1): 398-407. DOI: 10.11949/j.issn.0438-1157.20160875.
DOI：

ZHANG Zhiqiang, ZHENG Shengquan, WANG Qiliang, et al. 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, (1): 398-407. DOI: 10.11949/j.issn.0438-1157.20160875. DOI：

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Li1.2Ni0.2Mn0.2-x/2Mn0.6-x/2CrxO2（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Li1.2Ni0.2Mn0.2-x/2Mn0.6-x/2CrxO2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Li1.2Ni0.16Mn0.56Cr0.08O2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。

Abstract

Lithium-ion battery cathode materials Li1.2Ni0.2Mn0.2-x/2Mn0.6-x/2CrxO2(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 Li1.2Ni0.2Mn0.2-x/2Mn0.6-x/2CrxO2 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.Li1.2Ni0.16Mn0.56Cr0.08O2 has the best electrochemical properties.The first discharge specific capacity of Li1.2Ni0.16Mn0.56Cr0.08O2 is 246.6 mA·h·g-1at 0.1C

while Li1.2Ni0.2Mn0.6O2 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 Li1.2Ni0.16Mn0.56Cr0.08O2 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 Li1.2Ni0.16Mn0.56Cr0.08O2 has the lowest charge transfer impedance.

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