Block Copolymer-Templated Nanocomposite Electrodes for Rechargeable Lithium Batteries

Department of Chemistry, Northeastern University, Boston, Massachusetts 02115-5000, USAA self-organizing, nanocomposite electrode~SONE! system was developed as a model lithium alloy-based anode for rechargeablelithium batteries. In situ X-ray adsorption spectroscopy, galvanostatic testing, cyclic voltammetry, X-ray diffraction, and trans-mission electron microscopy were used to analyze the electrode, which was fabricated from a polyethylene oxide-based blockcopolymer, single-walled carbon nanotubes, and gold salt. Processing involved a single mixing step without need of a reducingagent. It was found that thermodynamic self-assembly of the block copolymer could provide a template for incorporation of boththe gold salt and nanotubes. Electrochemical testing and subsequent analysis showed that owing to the small particle size and thesurrounding block copolymer matrix, the SONE system could cycle over 600 cycles with rates varying between C/1.8 and 8.8Cwith little evidence of decrepitation or coarsening.© 2002 The Electrochemical Society. @DOI: 10.1149/1.1518482# All rights reserved.Manuscript submitted February 6, 2002; revised manuscript received June 13, 2002. Available electronically October 31, 2002.

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