Fast-ionic conductor Li_2.64(Sc_0.9Ti_0.1)₂(PO₄)₃ doped PVDF-HFP hybrid gel-electrolyte for lithium ion batteries

Abstract

With increasing demand on energy density of lithium-ion battery, wide electrochemical window and safety performance are the crucial request for next generation electrolyte. Gel-electrolyte as a pioneer for electrolyte solidization development aims to solve the safety and electrochemical window problems. However, low ionic conductivity and poor physical performance prohibit its further application. Herein, a fast-ionic conductor (Li_2.64(Sc_0.9Ti_0.1)₂(PO₄)₃) (LSTP) was added into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) base gel-electrolyte to enhance mechanical properties and ionic conductivity. Evidences reveal that LSTP was able to weaken interforce between polymer chains, which increased the ionic conductibility and decreased interface resistance during the cycling significantly. The obtained LiFePO₄/hybrid gel-electrolyte/Li-metal coin cell exhibited excellent rate capacity (145 mA·h/g at 1C, 95 mA·h/g at 3C, 28 °C) which presented a potential that can be comparable with commercialized liquid electrolyte system.

Keywords

lithium ion battery / hybrid gel-electrolyte / fast-ionic conductor / inorganic filler / electrochemical performance

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