ChemInform Abstract: Microwave-Solvothermal Synthesis of Nanostructured Li2MSiO4/C (M: Mn and Fe) Cathodes for Lithium-Ion Batteries.

✍ Scribed by T. Muraliganth; K. R. Stroukoff; A. Manthiram

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 24 KB
• Volume: 41
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.201052008

✦ Synopsis

Microwave-Solvothermal Synthesis of Nanostructured Li 2 MSiO 4 /C (M: Mn and Fe) Cathodes for Lithium-Ion Batteries. -The title materials are synthesized from mixtures of Si(OEt)4, LiOH, and Fe(OAc)2 or Mn(OAc)2 in tetraethyleneglycol (microwaves, 2.45 GHz, 600 W, 25 min). The obtained Li2MSiO4 nanocrystals are mixed with sucrose powder and carbonized in flowing Ar at 650 °C for 6 h. The samples are characterized by XRD, SEM, TEM, Raman spectroscopy, and electrochemical measurements. The Li2FeSiO4/C sample shows good rate capability and stable cycle life as a cathode for lithium ion batteries, with discharge capacities of 148 mAh/g at room temperature and 204 mAh/g at 55 °C. More than one Li can be extracted from the sample at 55 °C. Although Li2MnSiO4/C exhibits higher discharge capacities of 210 mAh/g at room temperature and 250 mAh/g at 55 °C, it suffers from poor rate capability and drastic capacity fade. -(MURALIGANTH, T.;