Development of composites based on lithium manganese nickel oxide and electroactive polymers

Author(s)

Canobre, Sheila C. ^[1] ; Montanhez, Livia ^[1] ; Fonseca, Carla Polo ^[1] ; Neves, Silmara ^[1]

Affiliation

^[1] Univ Sao Francisco, Programa Posgrad Engn & Ciencia Mat, LCAM, BR-13251900 Itatiba, SP - Brazil

• Document type: Journal article
• Source: Materials Chemistry and Physics; v. 114, n. 1, p. 350-355, MAR 15 2009.
• Web of Science Citations: 3

Abstract

A new composite cathode-active material based on lithium manganese nickel oxide (LiMn(2-x)Ni(x)O(4)), poly(2,5-dimercapto-1,3,4-thiadiazole) (PDMcT) and polyaniline (PAni) was synthesized. The formation of the uniform and well-connected polymer film on the surface of LiMn(2-x)Ni(x)O(4) particles was confirmed by Fourier-transform infrared spectra (FT-IR) and scanning electronic micrographs (SEM). The amounts of each constituent cannot be separately determined by thermogravimetric analysis (TGA). By galvanostatic charge-discharge tests, the PAni/PDMcT/LiMn(2-x)Ni(x)O(4) composite showed a better electrochemical performance than each single component (PAni, PDMcT and LiMn(2-x)Ni(x)O(4)) and binary composites (PAni/LiMn(2-x)Ni(x)O(4) and PDMcT/LiMn(2-x)Ni(x)O(4)). The electrical conductivity of the ternary composite reached 11.9 S cm(-1) and an initial discharge capacity of 305 mAh g(-1) was obtained. After 10 cycles, the coulombic efficiency and retention capacity was 99% and 90%, respectively. All results indicate a synergic effect among the materials in the composite. (c) 2008 Elsevier B.V. All rights reserved. (AU)