Authors: Yuhong Jin Li Wang Yuming Shang Jian Gao Jianjun Li Xiangming He
Publish Date: 2015/06/27
Volume: 21, Issue: 10, Pages: 2743-2754
Abstract
Highquality monodisperse multiporous hierarchical micro/nanostructured ZnCo2O4 microspheres have been fabricated by calcinating the Zn1/3Co2/3CO3 precursor prepared by ureaassisted solvothermal method The asprepared products are characterized by Xray diffraction XRD fieldemission scanning electron microscopy FESEM highresolution transmission electron microscopy HRTEM and BrunauerEmmettTeller BET measurement to study the crystal phase and morphology When tested as anode material for lithium ion batteries the multiporous ZnCo2O4 microspheres exhibit an initial discharge capacity of 1369 mAh g−1 32445 F cm−3 and retain stable capacity of 800 mAh g−1 1896 F cm−3 after 30 cycles It should be noted that the good electrochemical performances can be attributed to the porous structure composed of interconnected nanoscale particles which can promote electrolyte diffusion and reduce volume change during discharge/charge processes More importantly this ZnCo2O4 3D hierarchical structures provide a large number of active surface position for Li+ diffusion which may contribute to the improved electrochemical performance towards lithium storageThis work is supported by the MOST Grant Nos 2011CB935902 2013CB934000 2013AA050903 and 2010DFA72760 and the Tsinghua University Initiative Scientific Research Program Grant Nos 2010THZ08116 2011THZ08139 2011THZ01004 and 2012THZ08129 and State Key Laboratory of Automotive Safety and Energy Grant No ZZ2012011
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