Preparation of 3DGO/Co3O4 anode for lithium-ion batteries. (September 2021)

• Record Type: Journal Article
• Authors: Ren, Mingyuan; Yang, Xu; Ye, Han; Zhang, Yichi; Hou, Shan; Zheng, Guoxu
• Is Part Of: Materials today communications. Volume 28(2021)
• Publication Date: 2021-09
• Subjects: MOFs -- Co3O4 -- Lithium-ion battery -- Carbon-based -- Electrode materials; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2021.102734
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Carbon materials have the characteristics of stable structure, good mechanical properties, large specific surface area, and numerous reactive sites; however, they are characterized by low volumetric specific capacity, poor cycle stability, and poor electrochemical performance, which restricts their application in energy storage. In this study, three-dimensional graphene oxide (3DGO) as a carbon substrate material was combined with Co-MOF precursors to prepare carbon-based composite materials, and the influence of the microstructure of the composite on its electrochemical performance was investigated. The 3DGO/Co3 O4 nanosheet array composite material had a radial size of about 2 µm and a longitudinal size of about 20 nm. The arrays were staggered to form a porous structure, and the pore size was 0.2–2 µm. After 30 cycles, the Rct decreased to 50 Ω, from 140 Ω. The specific discharge capacity of the first cycle reached 800 mAh g −1, and the specific discharge capacity remained at 280 mAh g −1 at a high current density of 1000 mA g −1 . The 3D porous structure improved the lithium storage capacity and rate performance of the material. After the cycling experiment, a crosslinked structure appeared on the top of the electrode material nanosheets. Highlights: 3DGF/Co3 O4 array composite was prepared by low calcination process. Nanosheet on carbon matrix surface radial diameter is ~ 20 nm. Properties of composites were effectively enhanced by the effect of array crossing effect.