期刊
NANO RESEARCH
卷 7, 期 4, 页码 491-501出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0415-1
关键词
titanium dioxide; carbon nanofibers; areal capacity; lithium ion batteries
类别
资金
- National Research Foundation of Korea (NRF) [K207040000037A050000310]
- Korean Ministry of Education, Science and Technology (MEST)
- International Cooperation program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [2011T100100369]
- Industrial Strategic Technology Development Program - Korea Ministry of Knowledge Economy [10041589]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10041589] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013K1A1A2032443] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The inherently low electrical conductivity of TiO2-based electrodes as well as the high electrical resistance between an electrode and a current collector represents a major obstacle to their use as an anode for lithium ion batteries. In this study, we report on high-density TiO2 nanotubes (NTs) branched onto a carbon nanofiber (CNF) tree that provide a low resistance current path between the current collector and the TiO2 NTs. Compared to a TiO2 NT array grown directly on the current collector, the branched TiO2 NTs tree, coupled with the CNF electrode, exhibited similar to 10 times higher areal energy density and excellent rate capability (discharge capacity of similar to 150 mA.h.g(-1) at a current density of 1,000 mA.g(-1)). Based on the detailed experimental results and associated theoretical analysis, we demonstrate that the introduction of CNFs with direct electric contact with the current collector enables a significant increase in areal capacity (mA.h.cm(-2)) as well as excellent rate capability.
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