アルコラート法による層状LiNiO_2の合成とそのリチウム二次電池正極挙動

概要

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Preparation of layered stracture LiNiO_2 by the alcoholate method has been studied. The spinel type Li_xNiO_2 (x< 1) has been formed by pre heating powder samples obtained by pyrolysis of Ni alcoholate at 400℃ in both oxygen or air at 720℃. The final heating above 720℃ in oxygen is important to prepare the electroactive layered LiNiO_2. The LiNiO_2 prepared by the final heating at 740℃ showed excellent discharge capacity of 150 mAH/g after several cycles at c. d. 0.4 mA/cm^2 in lithium secondary batteries. The intercalation and deintercalation of Li^+ ion in Li^+NiO_2(0.4<x<1.0) have been studied by XRD analysis. The initial deintercalation of Li+ from originally prepared LiNiO_2 to Li_<0.41> NiO_2 proceeded in two phase reaction. Once Li_<0.41>NiO_2 is formed by the first charging process, intercalation and deintercalation reactions of Li^+ion in Li_<0.41>NiO_2 occur in one phase reaction.
社団法人日本セラミックス協会の論文
1994-03-01