Highly ordered and three-dimensionally interconnected nanoporous materials, constructed with a nanothick wall of LiMPO 4 (M = Fe, Mn) and a carbon (C) nanocomposite, were successfully synthesized by a colloidal crystal-template process. It was demonstrated for the first time that the ordered nanoporous composites show excellent rate capability not only for LiFePO 4 but also for LiMnPO 4 .The recent progress in chemical fabrication of nanomaterials has prompted increased interest in nanoscale optimization of photo-and electrochemical functional materials, catalysts, and so on. Synthesis of Li-host nanoparticles is actually one of the recent research trends for yielding high-power Li-ion batteries. 14The down-sizing of Li-host materials is expected to shorten the Li-diffusion length in the solid phase to reduce Li insertion extraction times. Olivine-type lithium metal phosphates have recently emerged as potential cathode materials for Li-ion batteries, because of their relatively high capacities and redox potentials, as well as their electrochemical stabilities. LiFePO 4 and LiMnPO 4 have particularly attracted a great deal of attention for their practical merits of low cost, natural abundance of Fe and Mn, and environmental benignity. However, these materials have inherently poor electronic conductivity and Li-ion diffusivity and hence poor rate-capability.5 Down-sizing of Li-host particles and their carbon coatings were effective in overcoming the latent problem for LiFePO 4 3,59 but not enough for LiMnPO 4 , having much lower conductivity than LiFePO 4 .1012 Since LiMnPO 4 theoretically has a higher energy density than LiFePO 4 because of its higher redox potential of 4.1 V vs. Li/Li + (3.5 V for LiFePO 4 ), recent studies have focused on improving the charge discharge properties of LiMnPO 4 by nanometer level structural control. 4,1317 It was reported that LiMnPO 4 nanocrystallites embedded in porous carbon show good rate capability as a result of an extension of the solid solution region in the LiMnPO 4 nanocrystallites, which lowers the kinetic barrier of the MnPO 4 LiMnPO 4 phase transition during Li insertionextraction.18 Therefore, precise control of the nanocomposite structure composed of LiMnPO 4 and carbon is expected to bring about a high capacity and rate for LiMnPO 4 -based materials.Herein, we have newly developed ordered nanoporous materials with a three-dimensionally continuous nanothick wall composed of LiMPO 4 (M = Fe, Mn) and carbon. Such nanoporous composites are expected to provide a high surface area interface of electrolyteactive material for increasing the chargetransfer rate and active material nanophases in the nanothick wall for reducing the Li-diffusion length, as well as electron and ion conducting paths by way of carbon phases in the wall and nanopores, respectively. 2,19,20 It is demonstrated for the first time that the ordered nanoporous composites show excellent ratecapability not only for LiFePO 4 but also for LiMnPO 4 . Nanoporous composites of LiMPO 4 (M = Fe, Mn) and carbon ...
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