層状岩塩型NaFeO_2のナトリウム脱離による構造変化と電気化学特性

概要

論文の詳細を見る
NaxFeO2 was obtained by chemical oxidization method using NO2BF4 and Br2 which shows the redox potential of ca. 5.1 V and ca. 4.1 V vs Li/Li+, respectively. The oxidized products showed different X-ray diffraction patterns depending on the oxidizing species. In case of NO2BF4, as soaking time progressed, new phase increased with decreasing of NaFeO2 as stating material. The oxidized NaxFeO2 was possible to be inserted the Li ion electrochemically, and resulted in the crystal structure similar to the layered LiFeO2 synthesized by the Li-ion-exchange method from NaFeO2. Reversible discharge-charge reactions were progressed for NaxFeO2 // Li cell, and ac. 150-200 mAh/g of initial capacities were achieved although the capacities decreased with cycle numbers.
社団法人粉体粉末冶金協会の論文
2006-11-15