NDLI: MnO nanoparticles with cationic vacancies and discrepant crystallinity dispersed into porous carbon for Li-ion capacitors

Content Provider	Royal Society of Chemistry (RSC)
Author	Cao, Guozhong Liu, Chaofeng Nan, Xihui Zhang, Changkun Song, Huanqiao Fu, Haoyu
Copyright Year	2016
Abstract	MnO nanoparticles with cationic vacancies and discrepant crystallinity were prepared through a one-step hydrothermal synthesis followed by calcination at different temperatures. Glucose was used as both a reducing agent to introduce cationic vacancies with a content of ∼5.5% into MnO nanocrystals, and a carbon source to encapsulate MnO nanocrystals in a three dimensional porous framework. Cationic vacancies benefit phase transition in a conversion reaction, and together with a low degree of crystallinity, may also provide more void spaces for ion diffusion (3.37 × 10−13 cm2 s−1). Three dimensional porous carbon with a pore volume of 0.27 cm3 g−1 demonstrated a high electrical conductivity of 6.25 S cm−1 and offered fast pathways for charge transfer and penetration of the electrolyte. Such a synergistic structure endowed MnO with excellent electrochemical properties including a considerably enhanced capacity of 650 mA h g−1 at a current density of 1000 mA g−1. Li ion capacitors based on such a MnO anode and activated carbon cathode achieved the maximum energy density of 220 W h kg−1, and the capacitance retention was 95.3% after 3600 cycles at a rate of 5000 mA g−1.
Starting Page	3362
Ending Page	3370
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta10002j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Li Hydrothermal synthesis Calcination Glucose Redox Carbon Phase transition Ion Diffusion Electrical resistivity and conductivity Electrolyte Electrochemistry Current density Anode Activated carbon Cathode Energy density Capacitance
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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