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FeNi2S4 QDs @C composites as a high capacity and long life anode material for lithium ion battery and ex situ investigation of electrochemical mechanism.
- Source :
-
Electrochimica Acta . Dec2017, Vol. 258, p1173-1181. 9p. - Publication Year :
- 2017
-
Abstract
- Nowadays, exploiting electrode materials with high energy density and long cycling life is crucial for meeting the urgent requirement of ever-growing energy storage for EV/HEV. Herein, we introduced a simple synthetic route to prepare FeNi 2 S 4 QDs @C composites on a large scale. By means of suitable design, the ultra-small FeNi 2 S 4 quantum dots (QDs) were encapsulated in the carbon matrix, and the forming FeNi 2 S 4 QDs @C composites exhibit excellent electrochemical performances. When tested as anode materials for lithium ion battery, the high capacity of 920 mAhg −1 at 0.1 Ag -1 could be achieved. Except the high capacity, the FeNi 2 S 4 QDs @C composites present the enhancing cycling stability, which demonstrated more than 700 cycles with twice capacity of graphite and capacity retention of almost 100% could be achieved, compared to the capacity of second cycle. Detailed investigations of phase evolutions by XRD patterns and TEM indicate the phase segregation of FeS x and NiS y during the charge/discharge process. The conversion reactions between Fe/Ni and FeS x /NiS y took place in the carbon matrixes, which would hinder the aggregation and grow-up of nanoparticles, resulting in the structure stability. Hence, the ultra-small size, self-doping and stable structure led to the superior electrochemical properties. We believe that the FeNi 2 S 4 @C composites would be an alternative anode material for next generation lithium ion battery. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 258
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 126977982
- Full Text :
- https://doi.org/10.1016/j.electacta.2017.11.172