期刊
CARBON
卷 76, 期 -, 页码 141-147出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.04.060
关键词
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资金
- NSF [DMR 1151028]
- Defense Advanced Research Project Agency (DARPA)
- State Scholarship Fund of the China Scholarship Council [2011608043]
- Fundamental Research Funds for the Central Universities [N100702001]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1151028] Funding Source: National Science Foundation
Porous iron oxide (Fe2O3) nanorods anchored on nitrogen-doped graphene sheets (NGr) were synthesized by a one-step hydrothermal route. After a simple microwave treatment, the iron oxide and graphene composite (NGr-I-M) exhibits excellent electrochemical performances as an anode for lithium ion battery (LIB). A high reversible capacity of 1016 mAh g(-1) can be reached at 0.1 A g(-1). When NGr-I-M electrode was further coated by 2 ALD cycles of ultrathin Al2O3 film, the first cycle Coulombic efficiency (CE), rate performance and cycling stability of the coated electrode can be greatly improved. A stable capacity of 508 mAh g(-1) can be achieved at 2 A g(-1) for 200 cycles, and an impressive capacity of 249 mAh g(-1) at 20 A g(-1) can be maintained without capacity fading for 2000 cycles. The excellent electrochemical performance can be attributed to the synergy of porous iron oxide structures, nitrogen-doped graphene framework, and ultrathin Al2O3 film coating. These results highlight the importance of a rational design of electrode materials improving ionic and electron transports, and potential of using ALD ultrathin coatings to mitigate capacity fading for ultrafast and long-life battery electrodes. (C) 2014 Elsevier Ltd. All rights reserved.
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