A new polypyrrole/maghemite hybrid as a lithium insertion electrode

Chai-Won Kwon (1) , Armel Poquet (1) , Stéphane Mornet (1) , Guy Campet (1) , Josik Portier (1) , Jin-Ho Choy (2)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 CINBM - Center for Intelligent Nano-Bio Materials

Anewpolypyrrole (PPY)/maghemite (γ-Fe2O3) hybrid was prepared by modification of the surface of maghemite nanoparticles using polymerization of pyrrole on the surface. Fourier Transform infrared (FTIR), X-ray diffraction and electron microscopy studies have proven that it was only a surface modification, keeping the core structure unchanged. Transmission electron micrographs have shown the presence of PPY on the intergrain surface between maghemite particles, leading to reduction of particle aggregation. The electrochemical lithium capacity has increased up to 270 mAh/g in the potential range between 1.3 and 4.3 V vs. Li at 8 mA/g. The modified samples showed an enhanced cyclability compared to the pristine one.

Mots clés: Maghemite; Lithium battery; Electrode material; Polypyrrole; Hybrid; Nanoparticle

Domaines: Matériaux

Chai-Won Kwon, Armel Poquet, Stéphane Mornet, Guy Campet, Josik Portier, et al.. A new polypyrrole/maghemite hybrid as a lithium insertion electrode. Electrochemistry Communications, 2002, 4 (2), pp.197-200. ⟨10.1016/S1388-2481(02)00250-3⟩. ⟨hal-00712912⟩