化工学报Issue(8)：3177-3182,6.DOI:10.11949/j.issn.0438-1157.20150562
Li3PO4掺杂的Li（Ni0.5Co0.2Mn0.3）O2锂离子电池正极材料的流变相法合成及电化学性能表征
Synthesis of Li3PO4-doped Li(Ni0.5Co0.2Mn0.3)O2 by rheological phase method and its electrochemical performance as cathode material for Li-ion batteries
张睿 1吴元欣 1何云蔚 2艾常春1
作者信息
- 1. 武汉工程大学化工与制药学院，湖北 武汉430073
- 2. 武汉工程大学化学与环境工程学院，湖北 武汉430073
- 折叠
摘要
Abstract
LiNixCoyMnzO2 (0<x<1, 0<y<1, 0<z<1) has become prosperous materials for the next generation of rechargeable lithium ion battery due to the synergistic effect of the three elements and their higher discharge voltage platform and charge-discharge capacity, but the cycle stability still need to be improved. The Ni0.5Co0.2Mn0.3(OH)2precursor was synthesized by using the method of hydroxide co-precipitation and the lithium phosphate doped Li(Ni0.5Co0.2Mn0.3)O2powders prepared by rheological phase reaction. The crystal structure and electrochemical performance of Li3PO4 doped Li(Ni0.5Co0.2Mn0.3)O2powders were measured by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), galvanostatic charge-discharge, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The result indicated that Li(Ni0.5Co0.2Mn0.3)O2doped with Li3PO4powders maintained the laminated structure ofα-type-NaFeO2, and the spherical powders were agglomerated with primary particles around 1μm. The initial discharge capacity of Li(Ni0.5Co0.2Mn0.3)O2powders doped with 1% (mass) Li3PO4 was 188.6 mA·h·g−1 (2.2—4.6 Vvs Li+/Li), and maintained 92.9% after 30 cycles at 0.1C. Moreover, CV results showed that oxidation and reduction potential of Li(Ni0.5Co0.2Mn0.3)O2 powders doped with 1% Li3PO4 were 3.98 and 3.64 V, the polarization of the sample was 0.34 V. The EIS tests showed that the charge transfer resistance and Warburg resistance of Li(Ni0.5Co0.2Mn0.3)O2powders doped with 1% Li3PO4 were 36.7 and 0.08661Ω. So that, Li3PO4 components can reduce the charge transfer resistance and Li+ diffusion resistance between electrode and electrolyte, and decrease the effect of polarization, thus promote the electrochemical performance of Li(Ni0.5Co0.2Mn0.3)O2.关键词
流变相反应/合成/Li3PO4/掺杂/Li(Ni0.5Co0.2Mn0.3)O2/正极材料/电化学性能Key words
rheological phase reaction/synthesized/Li3PO4/dope/Li(Ni0.5Co0.2Mn0.3)O2/cathode materials/electrochemical performance分类
信息技术与安全科学引用本文复制引用
张睿,吴元欣,何云蔚,艾常春..Li3PO4掺杂的Li（Ni0.5Co0.2Mn0.3）O2锂离子电池正极材料的流变相法合成及电化学性能表征[J].化工学报,2015,(8):3177-3182,6.
