Porous Co3O4 nanofibers surface-modified by reduced graphene oxide as a durable, high-rate anode for lithium ion battery

• Published in: Electrochimica acta Vol. 228; pp. 241 - 250
• Main Authors: Hu, Renzong, Zhang, Houpo, Bu, Yunfei, Zhang, Hanyin, Zhao, Bote, Yang, Chenghao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.02.2017
• Subjects: Cobalt oxides; conversion reaction; Full cell performance; Lithium ion batteries; Reduced graphene oxide; Lithium ion batteries; Full cell performance; Cobalt oxides; Reduced graphene oxide; conversion reaction
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2017.01.067

[Display omitted] Here we report our findings in synthesis and characterization of porous Co3O4 nanofibers coated with a surface-modification layer, reduced graphene oxide. The unique porous Co3O4@rGO architecture enables efficient stress relaxation and fast Li+ ions and electron transport during discharge/charge cycling. When tested in a half cell, the Co3O4@rGO electrodes display high Coulombic efficiency, enhanced cyclic stability, and high rate capability (∼900mAh/g at 1A/g, and ∼600mAh/g at 5A/g). The high capacity is contributed by a stable capacity yielded from reversible conversion reactions above 0.8V vs. Li/Li+, and a increasing capacity induced by the electrolyte decomposition and interfacial storage between 0.8 0.01V during discahrge. A full cell constructed from a Co3O4@rGO anode and a LiMn2O4 cathode delivers good capacity retention with operation voltage of ∼2.0V. These performances are better than those of other full cells using alloy or metal oxide anodes. Our work is a preliminary attempt for practicality of high capacity metal oxide anodes in Li-ion batteries used for the electronic devices.