FePO4-coatedLi[Li0.2Ni0.13Co0.13Mn0.54]O2withimprovedcyclingperformanceascathodematerialforLi-ionbatteries

被引:2
作者
Zhong Wang [1 ,2 ]
HuaQuan Lu [1 ,2 ]
YanPing Yin [1 ,2 ]
XueYi Sun [1 ,2 ]
XiangTao Bai [1 ,2 ]
XueLing Shen [1 ,2 ]
WeiDong Zhuang [1 ,2 ]
ShiGang Lu [1 ,2 ]
机构
[1] R&D Center for Vehicle and Energy Storage, General Research Institute of Nonferrous Metals
[2] China Automotive Battery Research Institue CoLtd
关键词
Lithium-ion battery; Cathode material; Coating; Lithium-rich; Iron phosphate;
D O I
暂无
中图分类号
TM912 [蓄电池]; TQ131.11 [];
学科分类号
0808 ; 0817 ;
摘要
Li[Li0.2Ni0.13Co0.13Mn0.54]O2 cathode materials were synthesized by carbonate-based co-precipitation method, and then, its surface was coated by thin layers of FePO4. The prepared samples were characterized by X-ray diffraction(XRD), field emission scanning electron microscope(FESEM), energy-dispersive spectroscopy(EDS), and transmission electron microscopy(TEM). The XRD and TEM results suggest that both the pristine and the coated materials have a hexagonal layered structure, and the FePO4 coating layer does not make any major change in the crystal structure. The FePO4-coated sample exhibits both improved initial discharge capacity and columbic efficiency compared to the pristine one. More significantly, the FePO4 coating layer has a much positive influence on the cycling performance. The FePO4 -coated sample exhibits capacity retention of 82 % after 100 cycles at 0.5 ℃ between 2.0 and 4.8 V, while only 28 % for the pristine one at the same charge-discharge condition. The electrochemical impedance spectroscopy(EIS) results indicate that this improved cycling performance could be ascribed to the presence of FePO4 on the surface of Li[Li0.2Ni0.13Co0.13Mn0.54]O2 particle, which helps to protect the cathode from chemical attacks by HF and thus suppresses the large increase in charge transfer resistance.
引用
收藏
页码:899 / 904
页数:6
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