TY - JOUR
T1 - Dual−crosslinked polyionic liquid polymer electrolyte with optimal balance of ion conductivity and mechanical properties for solid−state lithium metal battery
AU - Liu, Qi
AU - Li, Lei
AU - Liu, Gang
AU - He, Xi
AU - Niu, Yanhua
AU - Li, Guangxian
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/2/1
Y1 - 2024/2/1
N2 - Polyionic liquids (PILs) are considered promising candidates for next−generation solid polymer electrolytes (SPEs) because they combine the electrochemical stability of ionic liquids with the processability/flexibility of polymers. However, the practical application of PILs−based SPEs are limited by their unsatisfactory mechanical properties in parallel with their insufficient ionic conductivity. Here, a double crosslinked PIL-based SPE with an optimal balance of ionic conductivity and mechanical properties is constructed by ultraviolet (UV) initiated polymerization. Among, the ionic liquid 1−(4−vinylbenzyl)−3−butylimidazolium bis(trifluoromethanesulfonyl)imide ([VBBIM][TFSI]) as a monomer, poly(ethylene glycol) diacrylate (PEGDA) and polyhedral oligomeric sesquisiloxane (POSS) as a functional crosslinker. As expected, the synthesized PIL−based SPE (POSS-PIL-PEGDA−1, 1 wt% POSS) shows a high ionic conductivity of 1.8 × 10−4 S cm−1 (at 30 °C), a satisfactory tensile strength of 0.64 MPa, an ultrahigh thermal degradation temperature around 320 °C and a wide electrochemical stability window about 5.0 V versus Li/Li+. As a concept proof, the POSS-PIL-PEGDA−1 SPE can effectively inhibit lithium dendrites growth, and the assembled Li||LiFePO4 solid−state lithium metal battery achieves a high discharge capacity and a good cycling performance. This strategy is attractive for studying the trade−off between mechanical properties and ionic conductivity of crosslinked PIL−based SPEs.
AB - Polyionic liquids (PILs) are considered promising candidates for next−generation solid polymer electrolytes (SPEs) because they combine the electrochemical stability of ionic liquids with the processability/flexibility of polymers. However, the practical application of PILs−based SPEs are limited by their unsatisfactory mechanical properties in parallel with their insufficient ionic conductivity. Here, a double crosslinked PIL-based SPE with an optimal balance of ionic conductivity and mechanical properties is constructed by ultraviolet (UV) initiated polymerization. Among, the ionic liquid 1−(4−vinylbenzyl)−3−butylimidazolium bis(trifluoromethanesulfonyl)imide ([VBBIM][TFSI]) as a monomer, poly(ethylene glycol) diacrylate (PEGDA) and polyhedral oligomeric sesquisiloxane (POSS) as a functional crosslinker. As expected, the synthesized PIL−based SPE (POSS-PIL-PEGDA−1, 1 wt% POSS) shows a high ionic conductivity of 1.8 × 10−4 S cm−1 (at 30 °C), a satisfactory tensile strength of 0.64 MPa, an ultrahigh thermal degradation temperature around 320 °C and a wide electrochemical stability window about 5.0 V versus Li/Li+. As a concept proof, the POSS-PIL-PEGDA−1 SPE can effectively inhibit lithium dendrites growth, and the assembled Li||LiFePO4 solid−state lithium metal battery achieves a high discharge capacity and a good cycling performance. This strategy is attractive for studying the trade−off between mechanical properties and ionic conductivity of crosslinked PIL−based SPEs.
KW - Crosslinking
KW - Ionic conductivity
KW - Mechanical properties
KW - Polyionic liquid
KW - solid−state lithium metal battery
UR - http://www.scopus.com/inward/record.url?scp=85179486588&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2023.233897
DO - 10.1016/j.jpowsour.2023.233897
M3 - Article
AN - SCOPUS:85179486588
SN - 0378-7753
VL - 592
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 233897
ER -