Nanoletters碳包覆纳米电极材料通用技术.pdf

Letter /NanoLett General Strategy for Designing Core−Shell Nanostructured Materials for High-Power Lithium Ion Batteries Laifa Shen,†,‡ Hongsen Li,† Evan Uchaker,‡ Xiaogang Zhang,*,† and Guozhong Cao*,‡ †College of Material Science Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China ‡Department of Materials Science and Engineering, University of Washington, Seattle, Washington, 98195, United States S *Supporting Information ABSTRACT: Because of its extreme safety and outstanding cycle life, Li Ti O 4 5 12 has been regarded as one of the most promising anode materials for next-generation high-power lithium-ion batteries. Nevertheless, Li Ti O suffers from poor 4 5 12 electronic conductivity. Here, we develop a novel strategy for the fabrication of Li Ti O /carbon core−shell electrodes using metal oxyacetyl acetonate as titania 4 5 12 and single-source carbon. Importantly, this novel approach is simple and general, with which we have successfully produce nanosized particles of an olivine-type LiMPO4 (M = Fe, Mn, and Co) core with a uniform carbon shell, one of the leading cathode materials for lithium-ion batteries. Metal acetylacetonates first decompose with carbon coating the particles, which is followed by a solid state reaction in the limited reaction area inside the car