cheminform abstract: precursor-based synthesis and electrochemical performance of limnpo4
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ElectrodesF 3000 Precursor-Based Synthesis and Electrochemical Performance of LiMnPO4. —
NH4MnPO4·H2O is precipitated from aqueous solutions of MnCl2 and (NH4)2HPO4 or NH4H2PO4, and converted to olivine-like LiMnPO4 by solid state reaction with LiOH·H2O or Li2CO3 (400 °C, 2 h) or by ion exchange with an eutectic mixture LiCl/LiNO3 (270 °C, 6 h). The samples are characterized by powder XRD, SEM, and electrochemical measurements. NH4MnPO4·H2O crystallizes in the space group Pmn21 and LiMnPO4 in the space group Pnma. The morphology and size distribution of the precursor are preserved during ion-exchange, establishing a new preparation route for nanosized LiMnPO4 (flake-like crystallites up to 10 μm). After ball-milling with car-bon black the granular material delivers 30% of the theoretical capacity at C/5 as a rechargeable lithium battery cathode. — (BRAMNIK*, N. N.; EHRENBERG, H.; J. Alloys Compd. 464 (2008) 1-2, 259-264; Inst. Materialwiss., TU Darmstadt, D-64287 Darmstadt, Germany; Eng.) — W. Pewestorf
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ChemInform 2008, 39, issue 50 © 2008 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim