Cauliflower-like MnO@C/N composites with multiscale, expanded hierarchical ordered structures as electrode materials for Lithium- and Sodium-ion batteries. (20th August 2017)

• Record Type: Journal Article
• Authors: Chen, Ting; Wu, Zhenguo; Xiang, Wei; Wang, Enhui; Chen, Tingru; Guo, Xiaodong; Chen, Yanxiao; Zhong, Benhe
• Is Part Of: Electrochimica acta. Volume 246(2017)
• Page Start: 931
• Page End: 940
• Publication Date: 2017-08-20
• Subjects: MnO@C/N -- Cauliflower-like structure -- pseudocapacitive energy -- lithium ion batteries -- sodium ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.06.041
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: MnO@C/N composite with expanded cauliflower-like morphology was prepared via one-pot L-tryptophan assisted hydrothermal method following by annealing in Ar atmosphere. The cauliflower structure was assembled by porous nanowires that composed of MnO nanoparticles wrapped by continuous N-doped amorphous carbon matrix. Superior electrochemical performances were obtained in both lithium/sodium ion batteries. And the reaction kinetics of MnO@C/N in lithium/sodium ion batteries were analyzed and compared. More than 837 mAh g −1 could be retained after 300 cycles at 500 mA g −1 . And a high reversible capacity of 336 mAh g −1 at 5000 mA g −1 also demonstrate the excellent rate performance of MnO@C/N for LIBs. As to SIBs, 123 mAh g −1 could be maintained after 200 cycles at 100 mA g −1 . The superior performances could be attributed to the peculiar porous micro-nano structure and N-doped amorphous carbon coating. The reaction kinetics results revealed that the capacitive-controlled capacity would dominate of the electrochemical performance in SIBs and the diffusion-controlled capacity could play a more important role in LIBs, due to the atom weight and size of Na + is larger than Li + .