title: Porous mesocarbon microbeads with graphitic shells: constructing a high-rate, high-capacity cathode for hybrid supercapacitor.
abstract: Li₄Ti₅O₁₂/activated carbon hybrid supercapacitor can combine the advantages of both lithium-ion battery and supercapacitor, which may meet the requirements for developing high-performance hybrid electric vehicles. Here we proposed a novel "core-shell" porous graphitic carbon (PGC) to replace conventional activated carbon for achieving excellent cell performance. In this PGC structure made from mesocarbon microbead (MCMB), the inner core is composed of porous amorphous carbon, while the outer shell is graphitic carbon. The abundant porosity and the high surface area not only offer sufficient reaction sites to store electrical charge physically, but also can accelerate the liquid electrolyte to penetrate the electrode and the ions to reach the reacting sites. Meanwhile, the outer graphitic shells of the porous carbon microbeads contribute to a conductive network which will remarkably facilitate the electron transportation, and thus can be used to construct a high-rate, high-capacity cathode for hybrid supercapacitor, especially at high current densities.
authors: Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors: Yu
authors: Y
authors: Lei
authors: Zheng-Hong
authors: ZH
authors: Huang
authors: Ying
authors: Y
authors: Yang
authors: Wanci
authors: W
authors: Shen
authors: Yongping
authors: Y
authors: Zheng
authors: Hongyu
authors: H
authors: Sun
authors: Feiyu
authors: F
authors: Kang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D025802:Electric Capacitance; D011211:Electric Power Supplies; D004566:Electrodes; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D008863:Microspheres; D016062:Porosity
chemical_list: D002244:Carbon; D006108:Graphite
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