Synthesis and electrochemical properties of Li[Ni0.8Co0.1Mn0.1]O-2 and Li[Ni0.8Co0.2]O-2 via co-precipitation

초록

Spherical Li[Ni0.8Co0.2-xMnx]O-2 (x=0, 0.1) with phase-pure and well-ordered layered structure have been synthesized by heat-treatment of spherical [Ni0.8Co0.2-xMnx](OH)(2) and (LiOHH2O)-H-. precursors. The structure, morphology, electrochemical properties, and thermal stability of Li[Ni0.8Co0.2-xMnx]O-2 (x = 0, 0.1) were studied. The average particle size of the powders was about 10-15 mu m and the size distribution was narrow due to the homogeneity of the metal hydroxide [Ni0.8Co0.2-xMnx](OH)(2) (x = 0, 0. 1). The Li[Ni0.8Co0.2-xMnx]O-2 (x = 0, 0.1) delivered a discharge capacity of 197-202 mAh g(-1) and showed excellent cycling performance. Compared to Li[Ni0.8Co0.2]O-2, Li[Ni0.8Co0.1Mn0.1]O-2 exhibited greater thermal stability resulting from improved structural stability due to Mn substitution.

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