(777e) Sonic Enhancement of Battery Performance

Method
for Measuring Gas Evolution of Lithium-Ion Battery under Automotive Operation Conditions

Paul
T. Yu, Rohit Makharia

Electrochemical
Energy Research Laboratory, General Motors Company, Honeoye Falls, NY 14472,
USA

Abstract

Gas
evolution due to electrolyte-solvent/electrode interaction in lithium-ion
(Li-ion) battery is widely recognized.  It
is found that the gas generated during battery storage and cycling could result
in capacity fade. Furthermore, the gas generated abruptly under an abuse
condition and the time-dependent inflation of pouch-type battery cells strongly
impacts the design of battery packs and modules in automotive applications. Gas
evolution rate and its mechanism are not thoroughly understood due to the
complicated chemistry of electrolyte-solvent/electrode interactions under various
operation conditions. In this work, we focus on developing a test method to
evaluate gas evolution rate and gas composition in an operating Li-ion cell.
The test method includes an 8 cm² single cell connected with an
on-line modified gas chromatograph (GC) to quantify the amount of gas evolution
and to analyze the gas composition inside of a battery. Preliminary test
results show that this test method can quantify gas evolution rate and its
composition. Besides providing insight into solid-electrolyte interface (SEI) chemistry,
the proposed method could be used for screening electrolyte and its additives, and
optimization of operation window to minimize gas evolution while maximizing battery
life.

Key
words: Li-ion Battery, Gas Evolution, Solid-Electrolyte Interface, Gas
Chromatograph