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|Title:||Synthesis and characterization of LiNi1-x-yCoxMnyO2 as the cathode materials of secondary lithium batteries|
Lithium nickelate-cobalt and manganese substituted
Secondary lithium cell
|Citation:||Liu, Z.,Yu, A.,Lee, J.Y. (1999-09). Synthesis and characterization of LiNi1-x-yCoxMnyO2 as the cathode materials of secondary lithium batteries. Journal of Power Sources 81-82 : 416-419. ScholarBank@NUS Repository.|
|Abstract:||LiNi1-x-yCoxMnyO2 (0 ≤ x ≤ 0.5, 0 ≤ y ≤ 0.3) were prepared by heating Ni1-x-yCoxMny(OH)2 and LiNO3 in flowing oxygen for 10 h at 550°C, followed by another heating at 750°C. The XRD patterns of LiNi1-x-yCoxMnyO2 (0 ≤ x ≤ 0.5, 0 ≤ y ≤ 0.3) samples with different x and y values show a pure phase of layered hexagonal structure. The lattice parameters a, c and the unit cell volume are found to decrease with increasing x in LiNi1-xCoxO2 The partial substitution of Ni by Co and Mn as in LiNi1-xCoxO2 and LiNi1-yCo0.2MnyO2 has a positive effect on lithium stoichiometry. However, lithium deficiency is still found after a prolonged thermal treatments (24 h). Among the doped materials synthesized, LiNi0.8Co0.2O2 and LiNi0.7Co0.2Mn0.1O2 have shown the best characteristics in terms of initial capacity and cycle life. © 1999 Elsevier Science S.A. All rights reserved.|
|Source Title:||Journal of Power Sources|
|Appears in Collections:||Staff Publications|
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