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AIST TODAYNo.16 Spring 2005 [ PDF:17.6MB ]

Contents List Message:Toward the Second Research Phase Feature : Volcanic Eruptions and the Blessings from the Earth Research Hot Line In Brief

New Li-Mn-O Cathode Materials with High Voltage and Capacity

We have synthesized Li0.44MnO2 with a tunnel structure by ion exchange reaction in molten salt using Na0.44MnO2 as a precursor. ICP-AES analysis indicated the Na/Li ratio in the present Li0.44MnO2 sample was less than 0.003. The electrochemical tests using lithium metal anode showed the good charge-discharge cycles, and its initial discharge capacity of 166 mAh/g between 2.5 and 4.8 V. A plateau region above 4 V was first revealed in the present study. Partial replacement of manganese with titanium upgrades the performance further to initial discharge capacity of 177 mAh/g.
Fig.1
Fig. 1. Crystal structure of Li0.44MnO2.

Fig.2
Fig. 2. Initial discharge curves of newly developed lithium manganeseoxide cathode materials and its capacity upgraded by substitution withtitanium, using lithium metal anode after charging up to 4.8 V. Thephotograph is prototype coin-type cell.

Relational Information

AIST Today Vol.5,No3 (2005-No.16) 27

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