Abstract
Electrochemically active α-LiFeO 2 has been synthesized at low temperatures of less than 250°C via H +/Li + ionic exchange reaction in an alcoholic solution using iron oxyhydroxide (α-FeOOH) and a large excess lithium hydroxide as starting materials. It was found that the presence of water in the reaction bath plays a decisive role in generating the low temperature (LT) α-LiFeO 2 phase. The LT α-LiFeO 2 phase, as a cathode active material, was found to exhibit electrochemical rechargeability in a lithium cell with a cycling capacity of about 0.2Li/LiFeO 2 in the 1.5 V to 4.5 V range, in contrast to the non-rechargeable high temperature analog (HT α-LiFeO 2). A preliminary X-ray diffraction study on structural changes in the cathode during cycling showed minimal lattice parameter change.
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