Improvements of the electrochemical features of graphite fluorides in primary lithium battery by electrodeposition of polypyrrole

Improvements of the electrochemical features of CFx cathode materials in primary lithium battery were obtained by the electrodeposition of polypyrrole (PPy) performed in acetonitrile with Py monomer. The electrodeposition does not affect the core of the CFx powder as revealed by XRD and TEM. The maximum discharge rate which is 1C for pristine CFx increases for PPy-CFx and reaches 4C in the case of PPy-CF0.80 1 M LiPF6-EC:DMC (1:1) electrolyte. A maximum power density of 5235 W/kg (4C-rate) has been achieved with PPy-CF0.80, a value around 3.8 times higher than for CF0.80 (1C-rate). (C) 2011 Elsevier B.V. All rights reserved.