Towards flexible secondary lithium batteries: polypyrrole-LiFePO4 thin electrodes with polymer electrolytes

Kim, Jae-Kwang,1978Chalmers tekniska högskola,Chalmers University of Technology (author)

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%).

Manuel, J.Gyeongsang National University (author)
Lee, M. H.Gyeongsang National University (author)
Scheers, Johan,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kp01frjo (author)
Lim, D. H.Gyeongsang National University (author)
Johansson, Patrik,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jpatrik (author)
Ahn, J. H.Gyeongsang National University (author)
Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (author)
Jacobsson, Per,1958Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)pjacob (author)
Chalmers tekniska högskolaGyeongsang National University (creator_code:org_t)

In:Journal of Materials Chemistry: Royal Society of Chemistry (RSC)22:30, s. 15045-150491364-55010959-9428

By the author/editor: Kim, Jae-Kwang, ...; Manuel, J.; Lee, M. H.; Scheers, Johan, ...; Lim, D. H.; Johansson, Patri ...; show more...; Ahn, J. H.; Matic, Aleksanda ...; Jacobsson, Per, ...; show less...

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