三维碳微米网膜电极的锂电化学特征

在无氧环境下热解具有一定图样的SU-8光刻胶,成功地制备高度有序的碳微米网薄膜(CMNFs)。TEM和SAED结构特性测试表明该CMNFs为晶态和无定形碳混合相。CMNFs薄膜首次放电容量可达到300 μAh·cm^-2,在随后的循环中可逆容量保持在70 μAh·cm^-2。通过比较CMNFs在充放电循环前后形貌的变化,可以发现CMNFs能够保持原有网状结构,但网格骨架发生膨胀。这种膨胀与CMNFs表面的固相电解质中间相(SEI)形成有关。CMNFs具有较好的循环稳定性显示了在将来三维锂电池中是一个非常有希望的负极材料。     

Controllable Synthesis of a Highly Ordered Polymeric Structure Assembled from Cobalt‐Cluster‐based Racemic Supramolecules

Metallosupramolecule‐based polymeric platforms with high degrees of hierarchy and tailorable functionalities are of great interests because of their unique morphologies and potential applications. Herein, the controllable synthesis of a highly‐ordered polymeric structure, {[M,P‐Co₈(PDA)₆(HIP)₃(DMF)₅(H₂O)]₃‐[Co(DMF)(H₂O)₂]} ( 1 ) (PDA=2,6‐pyridinedicarboxylate, HIP=5‐hydroxyisophthalate, DMF=dimethylformamide) with unique topology is reported. The solid‐state structure of 1 reveals that it is alternately and periodically assembled from racemic supramolecular monomers to form a zigzag‐shaped polymeric strand. Discrete racemic supramolecules ( 2 ) with topologies similar to those of monomeric species of 1 are also controllably synthesized in a separate reaction. Formation of intermolecular hydrogen bonds between supramolecules associated with hydroxyl groups of HIPs are critical for the unique solid‐state packing geometries of 1 and 2 .