Overcharge Protection for 4 V Lithium Batteries at High Rates and Low Temperatures

Overcharge Protection for 4 V Lithium Batteries at High Rates and Low Temperatures

TitleOvercharge Protection for 4 V Lithium Batteries at High Rates and Low Temperatures
Publication TypeJournal Article
Year of Publication2010
AuthorsGuoying Chen, Thomas J Richardson
JournalJournal of Electrochemical Society
Volume157
A735
Issue6
PaginationA735-A740
Keywordslithium, lithium compounds, manganese compounds, polymers, secondary cells
Abstract

Overcharge protection for 4 V Li1.05Mn1.95O4/lithium cells at charging rates in excess of 1 mA/cm2 (3C) and at temperatures of as low as −20°C was achieved using a bilayer separator coated with two electroactive polymers. High rate and low temperature overcharge protection and discharge performance were improved by employing a design in which the polymer-coated portion of the separator is in parallel with the cell rather than between the electrodes. The effects of different membrane supports for the electroactive polymers were also examined.

DOI10.1149/1.3392370