2026-10-15T05:50:11Z https://www.scidb.cn/oai

10.57760/sciencedb.Partic.00031 2024-10-11T13:41:47Z

2024-10-11 Two-dimensional silica enhanced solid polymer electrolyte for lithium metal batteries doi:10.57760/sciencedb.partic.00031 en Solid polymer electrolytes (SPEs) are promising substitutes for current flammable liquid electrolytes to achieve high-safety and high-energy-density lithium metal batteries. Polyethylene oxide (PEO) based solid polymer electrolytes have attracted increasing attention because of their excellent flexibility, manufacturability, light weight, and low-cost processing, while they often suffer from low ionic conductivity at room temperature, low lithium transference number and unsatisfactory interfacial resistance, which largely restrain their practical application. Herein, two-dimensional holey silica nanosheets (2D-HSN) as the fillers, together with LiNO3 as the electrolyte additive, are introduced in a PEO/poly(vinylidene fiuoride-co-hexafluoropropylene) (PVDF-HFP) blended polymer matrix to obtain a SPE. The incorporation of HSN filler creates supplementary channels for lithium ion migration and lowers the crystallinity of the polymer, thereby facilitating the movement of lithium ions. The HSN-based SPE demonstrates higher ionic conductivity up to 3.7 × 10−4 S cm−1 at 30 °C, larger Li+ transference number close to 0.34, and more stable lithium plating/stripping than that without the fillers, and HSN can promote the formation of more stable solid electrolyte interphase (SEI) layer. The as-assembled LiFePO4||Li batteries deliver a high specific capacity of 159 mA h g−1 with the capacity retention of 95.5% after 200 cycles at 30 °C, as well as superior rate performance and cycling stability compared to that using the blank SPE. Vermiculite nanosheets; Two-dimensional silica; Solid polymer electrolytes; Fillers; Lithium metal batteries Zhihong Luo Weiyong Li Chong Guo Ya Song Mingxia Zhou Yan Shi Jing Xu Long Li Bin Shi Quansheng Ouyang Jiao-Jing Shao Guangmin Zhou PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/https://doi.org/10.1016/j.partic.2023.04.002 Science Data Bank