Journal
CHEMISTRY OF MATERIALS
Volume 22, Issue 3, Pages 1180-1185Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm902627w
Keywords
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Funding
- National Science Foundation [0705657]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0705657] Funding Source: National Science Foundation
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The layered oxide cathode material LiMO2, where M = Ni0.9-yMnyCo0.1 and 0.45 <= y <= 0.60, was synthesized by a coprecipitation method. X-ray diffraction analysis shows that the maximum manganese content in the stoichiometric material, i.e. with Li:M = 1, cannot exceed 50%; otherwise, a second phase is formed. Rietveld refinement reveals that Increasing manganese content Suppresses the disorder between the lithium and nickel ions. Magnetic measurements show that part of the Mn4+ ions in the manganese rich compounds is reduced to Mn3+; this results in a larger hysteresis loop due to the increased magnetic moment of the resulting ferrimagnetically ordered clusters. LiNi0.4Mn0.5Co0.1O2 and LiNi0.45Mn0.45Co0.1O2 show similar electrochemical capacities of around 180 mAh/g (between 2.5 and 4.6 V at 0.5 mA/cm(2)) for the first discharge. However, subsequent cycling of LiNi0.4Mn0.5Co0.1O2 results in faster capacity loss and poorer rate capability indicating that manganese rich compounds, with Li:M = 1:1, are probably not suitable candidates for lithiurn batteries.
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