Abstract
A unique hierarchically nanostructured composite of iron oxide/carbon (Fe3O4/C) nanospheres-doped three-dimensional (3D) graphene aerogel has been fabricated by a one-pot hydrothermal strategy. In this novel nanostructured composite aerogel, uniform Fe3O4 nanocrystals (5-10nm) are individually embedded in carbon nanospheres (ca. 50nm) forming a pomegranate-like structure. The carbon matrix suppresses the aggregation of Fe3O4 nanocrystals, avoids direct exposure of the encapsulated Fe3O4 to the electrolyte, and buffers the volume expansion. Meanwhile, the interconnected 3D graphene aerogel further serves to reinforce the structure of the Fe3O4/C nanospheres and enhances the electrical conductivity of the overall electrode. Therefore, the carbon matrix and the interconnected graphene network entrap the Fe3O4 nanocrystals such that their electrochemical function is retained even after fracture. This novel hierarchical aerogel structure delivers a long-term stability of 634mAhg-1 over 1000 cycles at a high current density of 6Ag-1 (7C), and an excellent rate capability of 413mAhg-1 at 10Ag-1 (11C), thus exhibiting great potential as an anode composite structure for durable high-rate lithium-ion batteries.
| Original language | English |
|---|---|
| Journal | Chemistry - A European Journal |
| DOIs | |
| Publication status | Accepted/In press - 2016 |
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Keywords
- Carbon nanospheres
- Graphene
- Lithium ion batteries
- Magnetite nanocrystals
- Nanostructures
ASJC Scopus subject areas
- Chemistry(all)
Cite this
One-Pot Synthesis of Pomegranate-Structured Fe3O4/Carbon Nanospheres-Doped Graphene Aerogel for High-Rate Lithium Ion Batteries. / He, Dafang; Li, Lixian; Bai, Fengjuan; Zha, Chenyang; Shen, Liming; Kung, Harold H; Bao, Ningzhong.
In: Chemistry - A European Journal, 2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - One-Pot Synthesis of Pomegranate-Structured Fe3O4/Carbon Nanospheres-Doped Graphene Aerogel for High-Rate Lithium Ion Batteries
AU - He, Dafang
AU - Li, Lixian
AU - Bai, Fengjuan
AU - Zha, Chenyang
AU - Shen, Liming
AU - Kung, Harold H
AU - Bao, Ningzhong
PY - 2016
Y1 - 2016
N2 - A unique hierarchically nanostructured composite of iron oxide/carbon (Fe3O4/C) nanospheres-doped three-dimensional (3D) graphene aerogel has been fabricated by a one-pot hydrothermal strategy. In this novel nanostructured composite aerogel, uniform Fe3O4 nanocrystals (5-10nm) are individually embedded in carbon nanospheres (ca. 50nm) forming a pomegranate-like structure. The carbon matrix suppresses the aggregation of Fe3O4 nanocrystals, avoids direct exposure of the encapsulated Fe3O4 to the electrolyte, and buffers the volume expansion. Meanwhile, the interconnected 3D graphene aerogel further serves to reinforce the structure of the Fe3O4/C nanospheres and enhances the electrical conductivity of the overall electrode. Therefore, the carbon matrix and the interconnected graphene network entrap the Fe3O4 nanocrystals such that their electrochemical function is retained even after fracture. This novel hierarchical aerogel structure delivers a long-term stability of 634mAhg-1 over 1000 cycles at a high current density of 6Ag-1 (7C), and an excellent rate capability of 413mAhg-1 at 10Ag-1 (11C), thus exhibiting great potential as an anode composite structure for durable high-rate lithium-ion batteries.
AB - A unique hierarchically nanostructured composite of iron oxide/carbon (Fe3O4/C) nanospheres-doped three-dimensional (3D) graphene aerogel has been fabricated by a one-pot hydrothermal strategy. In this novel nanostructured composite aerogel, uniform Fe3O4 nanocrystals (5-10nm) are individually embedded in carbon nanospheres (ca. 50nm) forming a pomegranate-like structure. The carbon matrix suppresses the aggregation of Fe3O4 nanocrystals, avoids direct exposure of the encapsulated Fe3O4 to the electrolyte, and buffers the volume expansion. Meanwhile, the interconnected 3D graphene aerogel further serves to reinforce the structure of the Fe3O4/C nanospheres and enhances the electrical conductivity of the overall electrode. Therefore, the carbon matrix and the interconnected graphene network entrap the Fe3O4 nanocrystals such that their electrochemical function is retained even after fracture. This novel hierarchical aerogel structure delivers a long-term stability of 634mAhg-1 over 1000 cycles at a high current density of 6Ag-1 (7C), and an excellent rate capability of 413mAhg-1 at 10Ag-1 (11C), thus exhibiting great potential as an anode composite structure for durable high-rate lithium-ion batteries.
KW - Carbon nanospheres
KW - Graphene
KW - Lithium ion batteries
KW - Magnetite nanocrystals
KW - Nanostructures
UR - http://www.scopus.com/inward/record.url?scp=84976209204&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84976209204&partnerID=8YFLogxK
U2 - 10.1002/chem.201504429
DO - 10.1002/chem.201504429
M3 - Article
AN - SCOPUS:84976209204
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
ER -