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Ionics (2011) 17:473–477 DOI 10.1007/s11581-011-0560-4
SHORT COMMUNICATION
Effect of slurry preparation and dispersion on electrochemical performances of LiFePO4 composite electrode
Wenjia Zhang & Xiangming He & Weihua Pu & Jianjun Li & Chunrong Wan
Received: 19 September 2010 / Revised: 27 February 2011 / Accepted: 5 April 2011 / Published online: 20 April 2011 # Springer-Verlag 2011
Abstract A study is attempted on how the dispersion of solid ingredients in solvent affects the electrochemical performance of LiFePO4 composite electrode. The slurries comprising LiFePO4 powder, carbon black and polymeric binder in solvent NMP (N-methyl-2-pyrrolidone) are prepared by two different processes, and results in different dispersion qualities. With better dispersion, the surfactant (Triton-100) is added into slurry as dispersing agent, whereas no dispersing agent in the other sample. The former process leads to more uniform dispersion of solid ingredients as compared to the latter. In the composite electrode prepared from the former process, the LiFePO4 and carbon black particles are homogeneously distributed without obviously reunion. Indebted to this favourable feature, this electrode exhibits a better high C-rate electrochemical performance for cycling and capacity than those without the surfactant. Keyword Lithium battery . Slurry . Dispersion agent . Homogeneously distribution . C-rate performance
Introduction Since first introduced by Goodenough in 1997, LiFePO4 is considered to be the most promising positive materials for lithium power batteries [1–4], for its advantage of low cost, innoxiously, environment-friendly and high safety. However, the development of LiFePO4 is greatly limited by the
W. Zhang : X. He (*) : W. Pu : J. Li : C. Wan Institution of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China e-mail: hexm@tsinghua.edu.cn
shortage in intrinsic conductivity. Up to now, the major research activities on LiFePO4 are mainly...