化工学报2017，Vol.68Issue(1)：398-407,10.DOI:10.11949/j.issn.0438-1157.20160875
Cr掺杂对富锂锰基正极材料Li1.2Ni0.2Mn0.6O2结构和电化学性能的影响
Effects of Cr-doping on structure and electrochemical performance of lithium-and manganese-rich cathode materials Li1.2Ni0.2Mn0.6O2
摘要
Abstract
Lithium-ion battery cathode materials Li1.2Ni0.2−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 Li1.2Ni0.2−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.关键词
锂离子电池/正极材料/富锂锰基/Li1.2Ni0.2Mn0.6O2/Cr掺杂Key words
lithium-ion battery/cathode material/lithium-and manganese-rich/Li1.2Ni0.2Mn0.6O2/Cr-doping分类
信息技术与安全科学引用本文复制引用
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Li1.2Ni0.2Mn0.6O2结构和电化学性能的影响[J].化工学报,2017,68(1):398-407,10.基金项目
国家自然科学基金项目（51304081）；江苏省自然科学基金项目（BK20140581，BK20150506，BK20140558）。 （）
