Zhang Xiang, Zhou Jun, Zheng Yuying, Chen Dongyang
College of Materials Science and Engineering , Fuzhou University , Fuzhou 350116 , P. R. China.
Key Laboratory of New Rubber and Plastic Materials , Quanzhou 362211 , P. R. China.
ACS Appl Mater Interfaces. 2020 Feb 26;12(8):9236-9247. doi: 10.1021/acsami.9b20866. Epub 2020 Feb 17.
Coordination compound derivates (CCDs) have been widely applied in lithium-ion batteries (LIBs). However, the functionalization of CCDs with open structure and heteroatomic doping is still challenging. Herein, an effective functionalization strategy is presented to prepare a kind of CCD, where CoSe nanoparticles are encapsulated by nitrogen-enriched hierarchically porous carbon (CS/NPC) based on the heat treatment of a cobalt-complexed hexamethylolmelamine-polyvinylpyrrolidone resin (Co/HPR). The abundant free volume and enriched N species of the HPR are responsible for the hierarchically porous configuration and high N-doping of the composites. By controlling the content of cobalt salt and the heating rate, high specific surface area (440.7 m g), high N-doping (8.54 atom %), and suitable mass loading of CoSe (55.5%) were simultaneously achieved in CS-2/NPC-5, which delivers high reversible capacity (758.5 mAh g at 0.1 A g), outstanding rate capability (401.7 mAh g at 5 A g), and excellent cycling durability (638.4 mAh g at 1 A g after 200 cycles), suggesting a promising candidate for LIB anode materials.
配位化合物衍生物（CCDs）已在锂离子电池（LIBs）中得到广泛应用。然而，具有开放结构和杂原子掺杂的CCDs的功能化仍然具有挑战性。在此，提出了一种有效的功能化策略来制备一种CCDs，其中基于钴络合六羟甲基三聚氰胺-聚乙烯吡咯烷酮树脂（Co/HPR）的热处理，CoSe纳米颗粒被富氮分级多孔碳（CS/NPC）包裹。HPR丰富的自由体积和富集的N物种导致了复合材料的分级多孔结构和高N掺杂。通过控制钴盐含量和加热速率，在CS-2/NPC-5中同时实现了高比表面积（440.7 m g）、高N掺杂（8.54原子%）和合适的CoSe质量负载（55.5%），其具有高可逆容量（在0.1 A g时为758.5 mAh g）、出色的倍率性能（在5 A g时为401.7 mAh g）和优异的循环耐久性（在1 A g下循环200次后为638.4 mAh g），表明其是一种有前景的LIB负极材料候选物。
