3D plum candy-like NiCoMnO4@graphene as anodes for high-performance lithium-ion batteries
| Autor: | Zhiya Lin, Jianming Tao, Zhigao Huang, Yingbin Lin, Chi Yubin, Chen Yuhan, Guozhen Liu, Hong Lixun |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Graphene General Chemical Engineering Diffusion Schottky diode chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences law.invention Anode chemistry Chemical engineering law Lithium Work function 0210 nano-technology Current density |
| Zdroj: | RSC Advances. 8:42438-42445 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c8ra08869a |
| Popis: | 3D plum candy-like NiCoMnO4 microspheres have been prepared via ultrasonic spraying and subsequently wrapped by graphene through electrostatic self-assembly. The as-prepared NiCoMnO4 powders show hollow structures and NiCoMnO4@graphene exhibits excellent electrochemical performances in terms of rate performance and cycling stability, achieving a high reversible capacity of 844.6 mA h g−1 at a current density of 2000 mA g−1. After 50 cycles at 1000 mA g−1, NiCoMnO4@graphene delivers a reversible capacity of 1045.1 mA h g−1 while the pristine NiCoMnO4 only has a capacity of 143.4 mA h g−1. The hierarchical porous structure helps to facilitate electron transfer and Li-ion kinetic diffusion by shortening the Li-ion diffusion length, accommodating the mechanical stress and volume change during the Li-ion insertion/extraction processes. Analysis from the electrochemical performances reveals that the enhanced performances could be also attributed to the reduced charge-transfer resistance and enhanced Li-ion diffusion kinetics because of the graphene-coating. Moreover, Schottky electric field, due to the difference in work function between graphene and NiCoMnO4, might be favorable for the redox activity of the NiCoMnO4. In light of the excellent electrochemical performance and simple preparation, we believe that 3D plum candy-like NiCoMnO4@graphene composites are expected to be applied as a promising anode materials for high-performance lithium ion batteries. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|