A study of capacity fade in cylindrical and prismatic lithium-ion batteries

Identical electrodes wound in both a cylindrical and a prismatic configurat ion provided different capacity fade rates. At the completion of 300 cycles with a C/2 charge and 1C discharge, the prismatic cells faded 24% and the cylindrical cells faded 16%. In the cylindrical-type cell, the fade was pri marily caused by a reduction in the capacity of the cathode. The higher fad e rate in the prismatic cell was attributed to lower cell stack pressure wh ich resulted in more anode swelling during cycling. The increased porosity of the anode in this cell reduced the integrity of the electrical conductio n network causing many graphite particles to become isolated or less access ible. (C) 2001 The Electrochemical Society.