期刊
ACS NANO
卷 7, 期 7, 页码 5801-5807出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn4019625
关键词
hollow carbon nanofibers; flexible Li-ion battery; freestanding electrode; irreversible capacity; Li FCC crystal
类别
资金
- Basic Science Research Program [2010-0022633]
- Engineering Research Center of Excellence Program [R11-2005-065]
- Global Research Lab Program through the National Research Foundation of Korea (NRF) [2010-00351]
- Ministry of Education, Science and Technology (MEST)
- Fundamental R&D Program for Technology of World Premier Materials
- Ministry of Knowledge Economy, Republic of Korea [10037919]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037919] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-00351] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In the foreseeable future, there will be a sharp increase in the demand for flexible Li-ion batteries. One of the most important components of such batteries will be a freestanding electrode, because the traditional electrodes are easily damaged by repeated deformations. The mechanical sustainability of carbon-based freestanding electrodes subjected to repeated electrochemical reactions with Li ions is investigated via nanotensile tests of individual hollow carbon nanofibers (HCNFs). Surprisingly, the mechanical properties of such electrodes are improved by repeated electrochemical reactions with Li ions, which is contrary to the conventional wisdom that the mechanical sustainability of carbon-based electrodes should be degraded by repeated electrochemical reactions. Microscopic studies reveal a reinforcing mechanism behind this improvement, namely, that inserted Li ions form irreversible face-centered-cubic (FCC) crystals within HCNF cavities, which can reinforce the carbonaceous matrix as strong second-phase particles. These FCC Li crystals formed within the carbon matrix create tremendous potential for HCNFs as freestanding electrodes for flexible batteries, but they also contribute to the irreversible (and thus low) capacity of HCNFs.
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