Abstract
Polyaniline (PANI), a conducting polymer, and carbon nanofibers (CNFs) were introduced as a combined additive to lithium ion battery cathodes. The PANI polymer is electrochemically active in the range of 2.0-3.8 V, which overlaps the operative redox couple of LiFePO4. The combined properties of PANI and CNF show that the composite material can act not only as a host material for improving Li+ ion intercalation but also as an agent for increasing overall battery conductivity. Electrochemical measurements showed that batteries fabricated with the combined LiFePO4/PANI/CNF cathode material had superior high-rate performance at >5C when compared against batteries made using either PANI or CNF as individual additives. The improvement can be attributed to an increase on the effect of, both, short-range and long-range conductivities.
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