Effects of Various Conductive Additive and Polymeric Binder Contents on the Performance of a Lithium-Ion Composite Cathode

Effects of Various Conductive Additive and Polymeric Binder Contents on the Performance of a Lithium-Ion Composite Cathode

TitleEffects of Various Conductive Additive and Polymeric Binder Contents on the Performance of a Lithium-Ion Composite Cathode
Publication TypeJournal Article
Year of Publication2008
AuthorsGao Liu, Honghe Zheng, S. Kim, Yonghong Deng, Andrew M Minor, Xiangyun Song, Vincent S Battaglia
JournalJournal of The Electrochemical Society
Volume155
A887
Issue12
PaginationA887-A892
Date Published10/2008
Keywordsadditives, composite materials, electrical conductivity, electrochemical electrodes, electron microscopy, nanostructured materials, polymers, secondary cells
Abstract

Fundamental electrochemical methods, cell performance tests, and physical characterization tests, such as electron microscopy, were used to study the effects of levels of the inert materials [acetylene black (AB), a nanoconductive additive, and polyvinylidene difluoride (PVDF), a polymer binder] on the power performance of lithium-ion composite cathodes. The electronic conductivity of the AB/PVDF composites at different compositions was measured with a four-point probe direct current method. The electronic conductivity was found to increase rapidly and plateau at an AB:PVDF ratio 0.2:1 (by weight), with 0.8:1 being the highest conductivity composition. AB:PVDF compositions along the plateau of 0.2:1, 0.4:1, 0.6:1, and 0.8:1 were investigated. Electrodes of each of those compositions were fabricated with different fractions of AB/PVDF to active material. It was found that at the 0.8:1 AB:PVDF, the rate performance improved with increases in the AB/PVDF loading, whereas at the 0.2:1 AB:PVDF, the rate performance improved with decreases in the AB/PVDF loading. The impedance of electrodes made with 0.6:1 AB:PVDF was low and relatively invariant

DOI10.1149/1.2976031