609 遊星ボールミルを利用したリチウムイオン二次電池用正極材料の合成

概要

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High-energy planetary milling has been applied to prepare precursors for the two kinds of cathode materials, LiNiO_2 and LiMn_2O_4,for rechargeable Lithium-ion batteries. The LiNiO_2 precursors can be converted to well-crystallized powders at 700-750℃ where the vaporization of lithium species is limited. Fine grinding and mechanical activation of the starting materials, enhanced mixing, and the encapsulation of the staring materials into sub-micrometer agglomerates, enables the synthesis at the low temperatures without feeding and excess O_2 gas. The resultant LiNiO_2 provided and excellent rechargeability up to 140mAhg^<-1>. The peculiarities of this method can be efficiently applied to the synthesis of LiNiO_2. Fine and uniform particle size in addition to the crystallinity required for this material is attained by heating the precursors above 500℃. The particle size of the synthesized powders are 72nm at 500℃ and 127nm at 700℃.
一般社団法人日本機械学会の論文
2002-08-23