title: Stable and high-rate overcharge protection for rechargeable lithium batteries.
abstract: Rechargeable lithium or lithium-ion cells can be overcharge-protected by an electroactive polymer composite separator. The use of non-woven fibrous membranes instead of conventional microporous membranes as the composite substrates allowed better distribution of the electroactive polymer, which led to improved utilization and a 40-fold increase in sustainable current density. For the first time, stable overcharge protection for hundreds of cycles was demonstrated in several cell chemistries, including LiNi1/3Co1/3Mn1/3O2, LiFePO4, and spinel Li1.05Mn1.95O4 half-cells. Protection at a charging rate as high as 5 C was achieved at a steady state cell potential below 4.85 V.
authors.affiliation: Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Richardson
authors.forename: Guoying
authors.initials: G
authors.lastname: Chen