期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 34, 页码 9760-9767出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta11665d
关键词
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资金
- Key National Basic Research and Development Program of China [2009CB220100]
- National Natural Science Foundation of China [51102018, 21103011]
- National High-Tech Research and Development Program of China [2011AA11A235, SQ2010AA1123116001]
The promising layered lithium-rich cathode materials, Li1.2Mn0.6-xNi0.2YxO2 (0 <= x <= 0.05), have been synthesized by substituting Mn4+ in Li1.2Mn0.6Ni0.2O2 with unusually large Y3+ ions, in order to improve their cycling performance and rate capability. An oxalate co-precipitation method is adopted in the synthetic process. X-ray diffraction (XRD) patterns show that, other than as a dopant, the yttrium element is found to become Y2O3 or LiYO2 in excess Y3+-doped samples. The effects of yttrium content on the electrochemical properties of the lithium-rich materials are investigated by electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge tests as well. It demonstrates that the high capacity retention (240.7 mA h g(-1) after 40 cycles at 0.1 C rate) and superior rate capability (184.5 mA h g(-1) after 40 cycles at 1 C rate) have been achieved by the lithium-rich materials with a suitable amount of Y3+ doping. The super-large Y3+ can expand Li+-diffusing channels in the layered structure and stabilize the material structure.
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