Li-ion batteries: news, progress, history and background

Angewandte Chemie International Edition Volume 49 Issue 12, Pages 2146 - 2149 Hyejung Kim, Minho Seo, Mi-Hee Park, Jaephil Cho, Prof. * School of Energy Engineering and Converging Research Center for Innovative Battery Technologies, Ulsan National Institute of Science & Technology, Ulsan, 689-798 (Korea) http://jpcho.com KEYWORDS batteries • carbon • electrochemistry • lithium • silicon ABSTRACT Well-dispersed Si nanocrystals with sizes of approximately 5, 10, and 20 nm were prepared in reverse micelles at high pressure and 380 °C and investigated as anode materials for lithium batteries. The 10 nm sized nanocrystals show a first charge capacity y of 3380 mAh g-1 and the highest capacity retention of 81 % after 40 cycles, which can be increased to 96 % by carbon coating (see picture). Received: 8 November 2009; Revised: 27 December 2009 (DOI) 10.1002/anie.200906287 source: http://www3.interscience.wiley.com/journal/123295109/abstract

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