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Porous carbon with large surface area derived from a metal–organic framework as a lithium-ion battery anode material

机译：具有金属-有机骨架的大表面积多孔碳，作为锂离子电池负极材料

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A new Cd-based metal–organic framework (Cd-MOF), namely [Cd3(TCPB)2(H2O)2(DMF)2]·7H2O, has been constructed from Cd(NO3)2 and 1,3,5-tri(4-carboxyphenoxy)benzene (H3TCPB) under solvothermal conditions. Single crystal X-ray diffraction analyses reveal that Cd-MOF displays a two-dimensional (3,6)-connected kgd net topology based on linear trinuclear Cd3(COO)6 secondary building units (SBUs) and exhibits one-dimensional opening channels. When treated as a precursor by calcining this Cd-MOF at 800 °C for 2 h, a porous carbon material was prepared. As an anode material for lithium-ion batteries (LIBs), the resulting porous carbon material exhibited an initial discharge of 2486 mA h g?1 and a charge of 1683 mA h g?1 at a current density of 300 mA g?1 with a high initial coulomb efficiency of 98%. After 300 cycles, a high reversible capacity as high as 1285 mA h g?1 could be still maintained, along with good rate capability and superior cyclic stability. The good electrochemical performance can be attributed to the unique pore structure and large surface area, which can largely offer more active sites for Li storage and cause an increase in the ability for the accumulation of charges.
机译：一种新的基于Cd的金属有机框架（Cd-MOF），即[Cd 3 （TCPB） 2 （H 2 O） 2 （DMF） 2 < / small>]·7H 2 O，是由Cd（NO 3 ） <溶剂热条件下的sub> 2 和1,3,5-三（4-羧苯氧基）苯（H 3 TCPB）。单晶X射线衍射分析表明Cd-MOF基于线性三核Cd 3 （COO）显示二维（3,6）连接的kgd网络拓扑 6 二级建筑单元（SBU），具有一维开放通道。将Cd-MOF在800°C下煅烧2 h作为前体处理后，制备了多孔碳材料。作为锂离子电池（LIB）的负极材料，所得多孔碳材料的初始放电为2486 mA hg ？1 ，电荷为1683 mA hg < small> ？1 ，电流密度为300 mA g ？1 ，初始库仑效率高达98％。 300次循环后，仍可保持高达1285 mA h g ？1 的高可逆容量，以及良好的速率能力和出色的循环稳定性。良好的电化学性能可归因于独特的孔结构和较大的表面积，可为锂存储提供更多的活性位点，并增加电荷积累的能力。

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