title: Composite Gel Polymer Electrolyte Based on Poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) with Modified Aluminum-Doped Lithium Lanthanum Titanate (A-LLTO) for High-Performance Lithium Rechargeable Batteries.
abstract: A composite gel polymer electrolyte (CGPE) based on poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) polymer that includes Al-doped Li0.33La0.56TiO3 (A-LLTO) particles covered with a modified SiO2 (m-SiO2) layer was fabricated through a simple solution-casting method followed by activation in a liquid electrolyte. The obtained CGPE possessed high ionic conductivity, a large electrochemical stability window, and interfacial stability-all superior to that of the pure gel polymer electrolyte (GPE). In addition, under a highly polarized condition, the CGPE effectively suppressed the growth of Li dendrites due to the improved hardness of the GPE by the addition of inorganic A-LLTO/m-SiO2 particles. Accordingly, the Li-ion polymer and Li-O2 cells employing the CGPE exhibited remarkably improved cyclability compared to cells without CGPE. In particular, the CGPE as a protection layer for the Li metal electrode in a Li-O2 cell was effective in blocking the contamination of the Li electrode by oxygen gas or impurities diffused from the cathode side while suppressing the Li dendrites.
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University , 77 Yongbongro, Bukgu, Gwangju 500-757, South Korea.
authors.forename: Hang T T
authors.initials: HT
authors.lastname: Le
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University , 77 Yongbongro, Bukgu, Gwangju 500-757, South Korea.
authors.forename: Duc Tung
authors.initials: DT
authors.lastname: Ngo
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University , 77 Yongbongro, Bukgu, Gwangju 500-757, South Korea.
authors.forename: Ramchandra S
authors.initials: RS
authors.lastname: Kalubarme
authors.affiliation: Department of Materials Science and Engineering, University of Washington , Seattle, Washington 98195-2120, United States.
authors.forename: Guozhong
authors.initials: G
authors.lastname: Cao
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University , 77 Yongbongro, Bukgu, Gwangju 500-757, South Korea.
authors.forename: Choong-Nyeon
authors.initials: CN
authors.lastname: Park
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University , 77 Yongbongro, Bukgu, Gwangju 500-757, South Korea.
authors.forename: Chan-Jin
authors.initials: CJ
authors.lastname: Park
keywords: Li dendrites; gel polymer electrolyte; ionic conductivity; solid electrolyte; stability