4ボルト級リチウム二次電池用正極材料LiMeO_2(Me=Ni,Ni/Co,Co)の合成とキャラクタリゼーション

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LiNiO_2, LiNi_<1/2>Co_<1/2>O_2, and LiCoO_2 were prepared and characterized by XRD and FT-IR. XRD data for these three samples indicated that lithium ions were located at octahedral 3(b) sites and transition metal ions at 3(a) sites in a cubic close packed oxygen array (space group; R3^^-m). XRD and IR methods to estimate the degree of contamination of rock-salt domain in the solid matrix were described. Electrochemical examinations for the well-characterized samples were also carried out in lithium nonaqueous cells. These three samples exhibited 130-140 mAh・g^<-1> of rechargeable capacity in the working voltage above 3.5 V with charge/discharge coulombic efficiency of ca. 97%. The key technology to establish 4-volts secondary nonaqueous lithium cells was briefly described together with a concept on the active material design based on the lithium-transition metal-oxygen ternary phase for a secondary system therefrom.
社団法人日本セラミックス協会の論文
1992-03-01