Huang Gang, Yin Dongming, Zhang Feifei, Li Qian, Wang Limin
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China.
University of Chinese Academy of Sciences , Beijing 100049, P. R. China.
Inorg Chem. 2017 Aug 21;56(16):9794-9801. doi: 10.1021/acs.inorgchem.7b01296. Epub 2017 Jul 31.
Novel hybrid metal oxides with advanced architectures are extensively pursued to achieve synergetic properties with respect to improved lithium-ion storage properties. Here, rationally designed yolk@shell or concave NiO-CoO@C (YNCC or CNCC) nanocubes have been fabricated by the simple and versatile thermolysis-induced transformation of metal-organic frameworks (MOFs), aimed at simultaneously addressing the capacity fade and conductivity deficiency of metal oxides. The as-prepared nanocomposites with plentiful hierarchical pores integrate the distinct functionalities of the ternary components: NiO and CoO as the major active materials can guarantee high capacity, while carbon can improve the conductivity and accommodate volume changes. Benefitting from the intrinsic material and architecture features, the YNCC and CNCC nanocomposites deliver excellent electrochemical performances with high reversible specific capacity, superior cycling stability (803 and 870 mAh g at 100 mA g after 100 cycles), and good rate capability (339 and 398 mAh g at 2 A g) as anode materials for lithium-ion batteries.
具有先进结构的新型混合金属氧化物被广泛研究，以实现协同性能，从而改善锂离子存储性能。在此，通过简单且通用的热解诱导金属有机框架（MOF）转化，制备了合理设计的蛋黄@壳或凹面NiO-CoO@C（YNCC或CNCC）纳米立方体，旨在同时解决金属氧化物的容量衰减和导电性不足问题。所制备的具有丰富分级孔隙的纳米复合材料整合了三元组分的独特功能：NiO和CoO作为主要活性材料可确保高容量，而碳可提高导电性并适应体积变化。受益于其内在的材料和结构特性，YNCC和CNCC纳米复合材料作为锂离子电池的负极材料，具有出色的电化学性能，包括高可逆比容量、优异的循环稳定性（100次循环后在100 mA g下为803和870 mAh g）以及良好的倍率性能（在2 A g下为339和398 mAh g）。
