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Inorg Chem. 2018 Jul 2;57(13):7993-8001. doi: 10.1021/acs.inorgchem.8b01156. Epub 2018 Jun 8.

Hierarchically Porous N,S-Codoped Carbon-Embedded Dual Phase MnO/MnS Nanoparticles for Efficient Lithium Ion Storage.

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Department of Advanced Energy Materials, College of Materials Science and Engineering , Sichuan University , Chengdu 610064 , P. R. China.
Research Institute of Natural Gas Technology , Petrochina Southwest Oil & Gas Field Company , Chengdu 610213 , P. R. China.
Department of Inorganic Materials Engineering, College of Materials Science and Engineering , Sichuan University , Chengdu 610064 , P. R. China.


An intriguingly nanostructured composite comprising of MnO/MnS nanoparticles embedded in an N,S-codoped carbon frame (MnO/MnS@C) is designed here and employed as a promising Li-ion storage electrode material to address the challenge of inferior conductivity and large volume change toward manganese chalcogenide-based anode. Combining with the merits of coherent MnO/MnS, elaborately hierarchical-porous architecture and N,S-codoped carbon frame, this composite exhibits high lithium-ion storage capacity (591 mAh g-1 at 0.1 A g-1) and remarkable cyclic performance (628 mAh g-1 at 1 A g-1 over 330 cycles). It is revealed via quantitative analysis that capacitive effect is also responsible for Li+ storage except ordinary diffusion-controlled mechanism, which consists of faradaic surface pseudocapacitance rooting from further oxidation of Mn2+ and nonfaradaic interfacial double-layer capacitance stemming from the charge separation at the MnO/MnS phase boundary. As a dynamic equilibrium for diffusion-controlled lithium storage, such capacitive contribution leads to ever-increasing Li-ion storage. The delicate construction endows an improved ion/electron transport kinetics, increased electrode/electrolyte contact area and plentifully heterogeneous interface, accounting for the high capacity and long-cycle stability.

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