4.8 Article

Black anatase titania enabling ultra high cycling rates for rechargeable lithium batteries

Journal

ENERGY & ENVIRONMENTAL SCIENCE
Volume 6, Issue 9, Pages 2609-2614

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee41960f

Keywords

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Funding

  1. National Research Foundation of Korea (NRF)
  2. Ministry of Education, Science and Technology [2011-0024683]
  3. National Research Foundation of Korea
  4. Korean government (MEST) [NRF-2009-C1AAA001-0093307]
  5. Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20124010203310]
  6. Korea government Ministry of Trade, Industry and Energy
  7. Korea Evaluation Institute of Industrial Technology (KEIT) [20124010203310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  8. National Research Foundation of Korea [2009-0093467, 2011-0024683] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this work we report the synthesis and the characterization of black anatase TiO2. We show that this material displays a nanostructured architecture, with an electro-conducting trivalent Ti. The presence of trivalent Ti in this structure narrows the inherent high band gap energy to a semiconductor level, reaching a value as low as 1.8 eV, resulting in the very high electrical conductivity of 8 x 10(-2) S cm(-1). These extraordinary electro-conducting physical properties ensure an ultra fast Li+ insertion into and extraction from the host structure of anatase TiO2 making it a unique, high rate electrode, delivering at a 100 C-rate (20 A g(-1)) a discharge capacity of 127 mA h (g-TiO2)(-1) with approximately 86% retention during 100 charge-discharge cycles at 25 degrees C and approximately 84% retention at -20 degrees C.

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