Li Jianbo, Li Zhenhua, Ning Fanyu, Zhou Lei, Zhang Ruikang, Shao Mingfei, Wei Min
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
ACS Omega. 2018 Feb 8;3(2):1675-1683. doi: 10.1021/acsomega.7b01832. eCollection 2018 Feb 28.
Transition metal oxides, such as CoO, have attracted great attention for lithium-ion batteries (LIBs) due to their high theoretical capacity and satisfactory chemical stability. However, the slow kinetics of Li-ion and electron transport as well as poor cycling stability still largely restrains their applications. Here, we report the rational design of well-defined mesoporous ultrathin CoO nanosheet arrays (NSAs) by topological transformation of layered double hydroxides nanosheet arrays (NSAs), which demonstrate significantly enhanced performance as anode for LIBs. The as-obtained CoO NSAs with suitable thickness and abundant mesopores show excellent electrochemistry performance for LIBs, giving a high specific charge capacity of 2019.6 mAh g at 0.1 A g, a good rate capability, and a remarkable cycling stability (1576.9 mAh g after the 80th cycle), which is much superior to that of CoO with thicker or thinner nanosheets as well as to that of the reported results. This facile strategy may be extended to the synthesis of other transition metal oxide NSAs, which can be potentially used in energy storage and conversion devices.
过渡金属氧化物，如氧化钴（CoO），因其高理论容量和良好的化学稳定性而在锂离子电池（LIBs）领域备受关注。然而，锂离子和电子传输的缓慢动力学以及较差的循环稳定性在很大程度上仍然限制了它们的应用。在此，我们报道了通过层状双氢氧化物纳米片阵列（NSAs）的拓扑转变合理设计出明确的介孔超薄氧化钴纳米片阵列（NSAs），其作为LIBs的负极表现出显著增强的性能。所获得的具有合适厚度和丰富介孔的氧化钴NSAs对LIBs显示出优异的电化学性能，在0.1 A g下具有2019.6 mAh g的高比充电容量、良好的倍率性能和出色的循环稳定性（第80次循环后为1576.9 mAh g），这远优于具有更厚或更薄纳米片的氧化钴以及已报道的结果。这种简便的策略可能会扩展到其他过渡金属氧化物NSAs的合成，其可潜在地用于能量存储和转换装置。
