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

Content Provider	Semantic Scholar
Author	Liu, Chaofeng Zhang, Changkun Song, Huanqiao Nan, Xihui Fu, Haoyu Cao, Guozhong
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	PDF HTM / HTML
DOI	10.1039/C5TA10002J
Volume Number	4
Alternate Webpage(s)	http://depts.washington.edu/solgel/documents/pub_docs/journal_docs/2016/C5TA10002J.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C5TA10002J
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article