Binder-Free Battery Electrodes
Karlheinz Strobl1, Rune Wendelbo2, Rahul Fotedar2, Riju Shinghal1, and Mathieu Monville1
1CVD Equipment Corporation, 355 S. Technology Drive, Central Islip, New York 11722, USA
2Graphene Batteries AS, Forskningsveien 1, 0314 Oslo, Norway
Battery and ultracapacitor electrodes are traditionally made with at least one polymeric binder material that mechanically holds the various, powder like, raw materials together. In addition to increasing the electrode resistance, the binder is assumed to be at least partially responsible for the performance degradation over time for rechargeable Lithium batteries.
We present here for the first time, by example of a lithium iron phosphate (LFP) based cathode, a novel lithium battery electrode design manufactured with CVD Equipment Corporation’s proprietary NanotoMacro™ platform technology that facilitates a binder-free approach. Preliminary tests, done by Graphene Batteries AS, show that between 0.2 and 5C rates this binder-free cathode has a similar specific capacity versus charge/discharge rate performance as the standard cathodes. Results of still ongoing more detailed studies will show if such a novel battery electrode manufacturing design can actually be used to delay the degradation of lithium batteries charging performance over increased numbers of charge/discharge cycles. In addition, we will present test results for 2-4 times thicker than normal (60 μm) thick cathode electrodes, which we expect will allow to significantly increase the volume and/or weight based energy density of lithium battery design.
Presented by Karlheinz Strobl at the MRS Fall 2013 Meeting in Boston, MA