Towards flexible secondary lithium batteries: polypyrrole-LiFePO4 thin electrodes with polymer electrolytes
Artikel i vetenskaplig tidskrift, 2012

A thin flexible polypyrrole-lithium iron phosphate (PPy-LiFePO4) based cathode has been fabricated. A slurry containing carbon black, a binder and the active material prepared by direct polymerization of pyrrole on the surface of LiFePO4 (LFP) was spread on an Al/carbon film substrate by the doctor blade method. Transmission electron micrographs reveal that PPy nanoparticles form a web like structure over the surface of LFP particles. After doping with lithium ions the PPy network becomes conducting. When evaluated as a cathode of 180 mu m thickness together with a gel polymer electrolyte and a lithium anode, the charge-discharge performance reveals that the electrochemical properties of LFP are influenced to a considerable extent by the PPy. The cells show high initial discharge capacities of 135 and 110 mA h g(-1) for 0.041 (C/10) and 0.21 (C/2) mA cm(-2), respectively, and high active material utilization. Furthermore the cells exhibit stable cycle properties even at 0.21 mA cm(-2) with a low capacity fade per cycle (similar to 0.3%).

carbon-coated lifepo4

electrochemical properties

cathode material

challenges

Författare

Jae-Kwang Kim

Chalmers, Teknisk fysik, Kondenserade materiens fysik

J. Manuel

Gyeongsang National University

M. H. Lee

Gyeongsang National University

Johan Scheers

Chalmers, Teknisk fysik, Kondenserade materiens fysik

D. H. Lim

Gyeongsang National University

Patrik Johansson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

J. H. Ahn

Gyeongsang National University

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Per Jacobsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Journal of Materials Chemistry

0959-9428 (ISSN) 1364-5501 (eISSN)

Vol. 22 30 15045-15049

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Materialvetenskap

Ämneskategorier

Kemi

DOI

10.1039/c2jm30965c