Porous olivine composites synthesized by sol–gel technique |
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| Affiliation: | 1. National Centre for Catalysis Research and Department of Chemistry, Indian Institute of Technology-Madras, Chennai 600 036, India;2. Materials Science Research Centre and Department of Chemistry, Indian Institute of Technology-Madras, Chennai 600 036, India;3. School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, United Kingdom;4. Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom |
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| Abstract: | Porous LiMPO4/C composites (where M stands for Fe and/or Mn) with micro-sized particles were synthesised by sol–gel technique. Particles porosity is discussed in terms of qualitative results obtained from SEM micrographs and in terms of quantitative results obtained from N2 adsorption isotherms. Porous particles could be described as an inverse picture of nanoparticulate arrangement, where the pores serve as channels for lithium supply and the distance between the pores determines the materials kinetics. Tests show that the electrochemical behaviour of porous LiMPO4/C composite is comparable with the results from the literature. The best electrochemical results were obtained with a LiFePO4/C composite (over 140 mAh g?1 at C/2 rate during continuous cycling). The capacity obtained with LiMnPO4/C composite is much lower (40 mAh g?1 at C/20 rate), although the textural properties are similar to those observed in the LiFePO4/C composite. |
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