Tris(pentafluorophenyl) Borane as an Additive to Improve the Power
Capabilities of Lithium-Ion Batteries
Zonghai Chen and K. Amine
Chemical Engineering Division, Argonne National Laboratory, Argonne,
Illinois 60439, USA
Tris(pentafluorophenyl) borane (TPFPB) was investigated as an electrolyte
additive to improve the power capabilities of lithium-ion batteries. As
discussed here, TPFPB is adopted as an anion receptor to dissolve the LiF in
passivation films, which create transport problems for both electrons and
lithium ions. We found that the power capabilities of lithium-ion batteries
could be dramatically improved by adding a controlled amount of TPFPB. Moreover,
the addition of TPFPB also improves the cycling performance of graphite/Li1.1[Ni1/3Co1/3Mn1/3]0.9O2
lithium-ion cells. Although the use of TPFPB as an anion receptor has been
reported to improve the ionic conductivity of the electrolyte, we demonstrate
that excessive TPFPB also significantly raises the interfacial impedance of
lithium-ion batteries. Therefore, high TPFPB concentrations are not recommended
for high-power lithium-ion batteries.
©2006 The Electrochemical Society
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