Iron based dual-metal oxides on graphene for lithium-ion batteries anode: Effects of composition and morphology

JOURNAL OF ALLOYS AND COMPOUNDS

卷:684

Article

Wu, Yingsi¹  Zhan, Liang¹  Huang, Kuntao¹  Wang, Hongjuan¹  Yu, Hao¹  Wang, Suqing¹  Peng, Feng¹  Lai, Chunyan² 

[1] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China

[2] Shanghai Univ Elect Power, Coll Environm & Chem Engn, Shanghai 200090, Peoples R China

关键词: Dual-transition-metal oxide;    Graphene;    Lithium-ion battery anode;    Hollow nanostructure;   

DOI  :  10.1016/j.jallcom.2016.05.151

来源: Elsevier

【 摘 要 】

Dual-transition-metal oxide (DTMO) nanostructures are emerging materials for lithium-ion battery (LIB) anodes with improved structural stability, electronic conductivity and electrochemical performance compared to their single-metal counterpart. Herein, composites of graphene with DTMOs (MFeO, M = Co, Mn, Zn) were controllably prepared by harnessing the synthesis atmospheres and the nanoscale diffusion couple. Their composition and morphology were characterized by TEM, EDS mappings, XRD and XPS. The NH3 treatment resulted in the formation of hollow DTMO nanoparticles on nitrogen-doped graphene, while H-2 and Ar gave graphene-supported hollow and solid DTMO particles, respectively. Electrochemical tests were applied to compare the performance of these composites as LIB anodes. The superior anode performance DTMO electrodes was demonstrated to the corresponding iron oxide composite. CoFe2O/RGO composites exhibit excellent rate capability and high-rate cycling stability for lithium storage, due to its stable solid structure. However, the hollowing of DTMO particles cannot elevate the capacity and stability, due to the interfacial resistance and structural changes upon cycling. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free