Heterojunction-structured MnCO3@NiO composites and their enhanced electrochemical performance

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 49; no. 41; pp. 14483 - 14489
• Main Authors: Zhang, Zexian, Tao Mei, Yang, Kai, Li, Jing, Tao, Zhi, Xiong, Yuting, Wang, Liangbiao
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 07.11.2020
• Subjects: Anode effect; Composite materials; Diameters; Electrochemical analysis; Epitaxial growth; Heterogeneous structure; Heterojunctions; Lithium; Lithium-ion batteries; Microspheres; Nickel oxides; Rechargeable batteries; Structural stability; Surface stability; Synergistic effect; Thickness
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d0dt02780d

The conductivity and stability of materials have always been the main problems hindering the development of lithium-ion battery applications. Here, we successfully construct MnCO3@NiO composites with unique heterogeneous structure via the epitaxial growth of porous NiO nanosheets (thickness: ∼125 nm) on MnCO3 microspheres (diameter: ∼3 μm) to be the anode of lithium-ion batteries. The synergistic effect provided by this special heterogeneous structure effectively improves the electrochemical kinetics, specific surface area as well as structural stability of the composites, finally resulting in predictable enhanced comprehensive electrochemical performance. The electrochemical results show that the MnCO3@NiO composites exhibit a reversible discharge capacity of 624 mA h g−1 at a current density of 1.0 A g−1 up to 300 cycles.