PURPOSE: To obtain a lamellar LiMnO2 used as a positive pole material for lithium secondary battery fine and large in surface area and showing high output and high energy density, and capable of applying for various uses as a host compound without restricting the atmosphere by specifying particle diameter and BET specific surface area.
CONSTITUTION: The lamellar LiMnO2 is composed of particles having ≤5μm particle diameter and ≥10m2/g BET specific surface area. The acicular hydrated manganese oxide (γ-MnOOH) having the equivalent diameter to ≤1μm minor axis diameter, ≤5μm major axis diameter and ≤1μm thickness is used to synthesize the lamellar LiMnO2. The acicular hydrated manganese oxide is stirred in a Li containing alkaline aq. solution ≥1.0 in Li/Mn mol ratio and ≥1.0 in OH/Mn mol ratio, heated at ≤200°C in an atmosphere containing oxygen and heated at ≥200°C in an atmosphere containing no oxygen to remove water.
YOSHIDA SETSUO
SAWANO MASANORI
MORI TAKASHI
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