Abstract
A facile and green freeze-drying-assisted method was proposed to synthesize CoMoO4 mesoporous nanosheets( MPNSs). The resulting product exhibits a high specific capacity and good rate performance when evaluated as an anode material for lithium-ion batteries(LIBs). The reversible specific capacity can be kept at 1105.2 mA·h·g–1 after 100 cycles at a current density of 0.2 A/g. Even at the current densities of 1 and 4 A/g, the CoMoO4 MPNSs electrode can still retain the reversible capacities of 1148.7 and 540 mA·h·g–1, respectively. Furthermore, the full cell(LiFePO4 cathode/CoMoO4 MPNSs anode) displays a stable discharge capacity of 146.7 mA·h·g–1 at 0.1 C (1 C=170 mA/g) together with an initial coulombic efficiency of 98.2%. In addition, the CoMoO4 crystal structure is destroyed and reduced into Co0 and Mo0 in the first discharge process. In the subsequent cycles, the attractive Li storage properties come from the reversible conversions between Co/Co2+ and Mo/Mo6+. The improved electrochemical performance of CoMoO4 MPNSs is mainly attributed to their unique porous structures, which not only possess a good ion diffusion and electronic conduction pathway, but also provide many cavities to alleviate the volume changes during repeated cycling. This work offers a new perspective to the design of other porous electrode materials with a good energy storage performance.
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Supported by the Natural Science Foundation of Zhejiang Province, China(No.LQ18B010001), the Scientific Research Fund of Zhejiang Provincial Education Department, China(Nos.Y201737041, Y201839092), the Scientific Research Fund o f Ningbo City, China(Nos.2018A610083, 2017A610299), the Scientific Research Fund of Ningbo University, China(Nos.XYL17007, 2018SRIP0041), the National College Students’ Innovation and Entrepreneurship Training Program, China(No.201813277003), the National Natural Science Foundation of China(No.21701095), the Natural Science Foundation of Shandong Province, China(No.ZR2017BEM007), the China Postdoctoral Science Foundation(No.2017M622131) and the Program of Science and Technology for Higher Education in Shandong Province, China(No.J17KA010).
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Wang, W., Wang, T., Fan, X. et al. Freeze-drying-assisted Synthesis of Mesoporous CoMoO4 Nanosheets as Anode Electrode Material for Enhanced Lithium Batteries. Chem. Res. Chin. Univ. 35, 261–270 (2019). https://doi.org/10.1007/s40242-019-8316-1
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DOI: https://doi.org/10.1007/s40242-019-8316-1