Bifunctional effects of carbon coating on high-capacity Li1.2Ni0.13Co0.13Mn0.54O2 cathode for lithium-ion batteries
作者： JJ Chen , ZD Li , HF Xiang , WW Wu , X Guo
DOI: 10.1007/S10008-014-2707-5
关键词: Carbonization 、 Inorganic chemistry 、 Electrochemistry 、 Materials science 、 Cathode 、 Cyclic voltammetry 、 Lithium 、 Coating 、 Carbon 、 Electrolyte
摘要: Coating the Li-rich layered oxide cathode Li1.2Ni0.13Co0.13Mn0.54O2 with small amount of conductive carbon is realized by low-temperature sucrose carbonization in air. Carbon coating gives rise to a Mn3+ on surface Li1.2Ni0.13Co0.13Mn0.54O2. The 1.2 wt% carbon-coated shows obviously enhanced electrochemical performances, especially improving rate capability and suppressing voltage fading during long-term high-rate cycling. According analysis from cyclic voltammetry (CV) impedance spectra (EIS), improvements performances are mainly because coated layer can function not only increasing electronic conductivity at interface electrolyte but also bulk ionic amounts Mn3+. Therefore, promising approach improve stability oxides.
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