Effect of Electrode Adhesion Strength on Lithium-ion Battery Performance
Loading...
Date
2020-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The Ohio State University
Abstract
Lithium-ion batteries (LIBs) have applications ranging from small electronic devices to big
battery packs used in electric vehicles. Although commercial batteries have good performance,
they have low volumetric density and low active material utilization and high cost of production.
To address this, increasing the thickness of the electrode (>200 μm) beyond the conventional
thickness (~60 μm ) is a promising approach. Thick electrodes have more active materials packed
in a given volume thereby improving energy density and reducing the amount of inactive materials
to lower the cost of production. Good adhesion properties at the interface of electrode and substrate
are crucial for achieving the desired battery performance. Improper adhesion is caused due to
various reasons including generation of internal stress, mismatch of surface energies, etc.
Particularly in thick electrodes, which are desirable for high energy density, adhesion strength is a
critical factor for performance. Although a few groups have explored the adhesion properties of
LIB electrodes, their effect on the performance and the parameters affecting the adhesion have not
been studied. The conventional 180° mechanical peel test is a well-known technique to measure
adhesion strength by peeling away the electrode from the current collector. In this research, the
impact of various parameters such as the thickness of the electrode, binder material, viscosity of
the slurry, and different current collectors on the adhesion strength of the electrode are studied
through systematic experiments and the corresponding variation in battery performance is
reported.
Description
Keywords
Battery Performance, Adhesion Force, Lithium-ion Battery, LIB, Thick Electrode