Abstract
Developing high-quality solid-state electrolytes is important for producing next-generation safe and stable solid-state lithium-ion batteries. Herein, a three-dimensional highly porous polymer electrolyte based on poly (vinylidenefluoride-hexafluoropropylene) (PVDF-HFP) with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticle fillers (PVDF-HFP-LLZTO) is prepared using the electrospinning technique. The PVDF-HFP-LLZTO gel polymer electrolyte possesses a high ionic conductivity of 9.44 × 10–4 S cm−1 and a Li-ion transference number of 0.66, which can be ascribed that the 3D hierarchical nanostructure with abundant porosity promotes the liquid electrolyte uptake and wetting, and LLZTO nanoparticles fillers decrease the crystallinity of PVDF-HFP. Thus, the solid-state lithium battery with LiFePO4 cathode, PVDF-HFP-LLZTO electrolyte, and Li metal anode exhibits enhanced electrochemical performance with improved cycling stability.
Highlights
Nowadays, there has been a strong demand for developing rechargeable lithium batteries with high energy density and high safety for many applications, such as portable electronic devices, electric vehicles, and grid storage of electricity (Thangadurai et al, 2014; Manthiram et al, 2017; Zhao et al, 2020)
Solid-state electrolytes (SSEs) can be categorized into two major types: inorganic solid electrolytes (ISEs) and polymer solid electrolytes (PSEs) (Gao et al, 2018; Tan et al, 2020; Yuan et al, 2021)
We prepare a three-dimensional highly porous polymer electrolyte based on PVDF-HFP with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticle fillers by the electrospinning technique
Summary
There has been a strong demand for developing rechargeable lithium batteries with high energy density and high safety for many applications, such as portable electronic devices, electric vehicles, and grid storage of electricity (Thangadurai et al, 2014; Manthiram et al, 2017; Zhao et al, 2020). Among these lithium ion conductors, garnet LLZO has attracted much attention due to its outstanding stability with lithium metal anode and superior ionic conductivity (Zhang X. et al, 2017; Zhou et al, 2020) Another way is to prepare porous GPE membranes to improve the absorbing ability of liquid electrolyte (Wang et al, 2017; Zhang D. et al, 2017). We prepare a three-dimensional highly porous polymer electrolyte based on PVDF-HFP with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticle fillers by the electrospinning technique This unique 3D hierarchical nanostructure possesses abundant porosity that promotes the liquid electrolyte uptake and wetting and favors the Li-ion transfer between the electrodes and electrolyte. Transference number and ensuring the cycling stability and high rate performance
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