Thirunakaran, R. and Ravikumar, R. and Vanitha, S. and Gopukumar, S. and Sivashanmugam, A. (2011) Glutamic acid-assisted sol–gel synthesis of multi-doped spinel lithium manganate as cathode materials for lithium rechargeable batteries. Electrochimica Acta, 58 (01). pp. 348-358. ISSN 0013-4686

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LiMn2O4 and LiMgxSnyAlzMn2−x−y−zO4 (x, y, z = Mg, Sn, Al) (x = 0.01–0.09; y = 0.04–0.1; z = 0.35–0.20) powders have been synthesized via the sol–gel method for the first time using glutamic acid as the chelating agent. The synthesized samples have been subjected to physical and electrochemical characterization. SEM images of parent LiMn2O4 show that the majority of the grains are 1 micrometer in size. The LiMg0.01Sn0.04Al0.35Mn1.6O4 and LiMg0.04Sn0.06Al0.30Mn1.6O4 particles present a low degree of agglomeration and the primary particles are 1 micrometer in size. TEM images of the spinel LiMn2O4 and LiMgxSnyAlzMn2−x−y−zO4 ascertain that the synthesized particles are nano-sized with uniform surface morphology. The LiMn2O4 samples calcined at 850 ◦C deliver a discharge capacity of 122 mAh g−1 in the first cycle. Among the compositions investigated, LiMg0.01Sn0.06Al0.30Mn1.6O4 delivers 115 mAh g−1 in the first cycle and exhibits stable cycling performance with a low capacity fade of 1 mAh g−1 cycle−1 over the 10 cycles investigated

Item Type: Article
Uncontrolled Keywords: Triple doping; Sol–gel method; Glutamic acid; Differential capacity; Spinel cathode; Li-ion battery
Subjects: Lithium batteries
Electrochemical Power Sources
Depositing User: ttbdu cecri
Date Deposited: 19 Nov 2012 11:53
Last Modified: 19 Nov 2012 11:53

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