Recently,poly(ethylene oxide)(PEO)-based solid polymer electrolytes have been attracting great attention,and efforts are currently underway to develop PEO-based composite electrolytes for next generation high performa...Recently,poly(ethylene oxide)(PEO)-based solid polymer electrolytes have been attracting great attention,and efforts are currently underway to develop PEO-based composite electrolytes for next generation high performance all-solid-state lithium metal batteries.In this article,a novel sandwich structured solid-state PEO composite electrolyte is developed for high performance all-solid-state lithium metal batteries.The PEO-based composite electrolyte is fabricated by hot-pressing PEO,LiTFSI and Ti_(3)C_(2)T_(x) MXene nanosheets into glass fiber cloth(GFC).The as-prepared GFC@PEO-MXene electrolyte shows high mechanical properties,good electrochemical stability,and high lithium-ion migration number,which indicates an obvious synergistic effect from the microscale GFC and the nanoscale MXene.Such as,the GFC@PEO-1 wt%MXene electrolyte shows a high tensile strength of 43.43 MPa and an impressive Young's modulus of 496 MPa,which are increased by 1205%and 6048%over those of PEO.Meanwhile,the ionic conductivity of GFC@PEO-1 wt%MXene at 60℃ reaches 5.01×10^(-2) S m^(-1),which is increased by around 200%compared with that of GFC@PEO electrolyte.In addition,the Li/Li symmetric battery based on GFC@PEO-1 wt%MXene electrolyte shows an excellent cycling stability over 800 h(0.3 mA cm^(-2),0.3 mAh cm^(-2)),which is obviously longer than that based on PEO and GFC@PEO electrolytes due to the better compatibility of GFC@PEO-1 wt%MXene electrolyte with Li anode.Furthermore,the solid-state Li/LiFePO_(4) battery with GFC@PEO-1 wt%MXene as electrolyte demonstrates a high capacity of 110.2–166.1 mAh g^(-1) in a wide temperature range of 25–60C,and an excellent capacity retention rate.The developed sandwich structured GFC@PEO-1 wt%MXene electrolyte with the excellent overall performance is promising for next generation high performance all-solid-state lithium metal batteries.展开更多
分别采用中红外(MIR)光谱技术(包括:一维 MIR 光谱、二阶导数 MIR 光谱和四阶 MIR 光谱)开展了玻璃布纤维涂层(简称:涂层)的结构研究,实验发现:涂层的红外吸收模式主要包括: ν as CH2-涂层 、 ν s CH2-涂层 、 ν C=O-涂层 、 ν 酰胺...分别采用中红外(MIR)光谱技术(包括:一维 MIR 光谱、二阶导数 MIR 光谱和四阶 MIR 光谱)开展了玻璃布纤维涂层(简称:涂层)的结构研究,实验发现:涂层的红外吸收模式主要包括: ν as CH2-涂层 、 ν s CH2-涂层 、 ν C=O-涂层 、 ν 酰胺-Ⅰ-涂层 、 ν Si-Ar-涂层 和 ν Si-O-Ar-涂层 等;研究发现:涂层的主要化学结构包括:硅树脂、聚酰亚胺和聚氨酯。采用变温中红外(TD-MIR)光谱进一步开展了涂层的热稳定性研究,实验发现:随着测定温度的升高(303 K ~ 393 K),其热稳定性进一步降低,进一步进行了机理研究。研究进一步证明 MIR 光谱和 TD-MIR 光谱在重要的无机材料(玻璃布纤维)涂层结构研究中的重大作用。展开更多
基金support of the Fundamental Research Funds for the Central Universities(No.2022CDJQY-004)the Fund for Innovative Research Groups of Natural Science Foundation of Hebei Province(No.A2020202002).
文摘Recently,poly(ethylene oxide)(PEO)-based solid polymer electrolytes have been attracting great attention,and efforts are currently underway to develop PEO-based composite electrolytes for next generation high performance all-solid-state lithium metal batteries.In this article,a novel sandwich structured solid-state PEO composite electrolyte is developed for high performance all-solid-state lithium metal batteries.The PEO-based composite electrolyte is fabricated by hot-pressing PEO,LiTFSI and Ti_(3)C_(2)T_(x) MXene nanosheets into glass fiber cloth(GFC).The as-prepared GFC@PEO-MXene electrolyte shows high mechanical properties,good electrochemical stability,and high lithium-ion migration number,which indicates an obvious synergistic effect from the microscale GFC and the nanoscale MXene.Such as,the GFC@PEO-1 wt%MXene electrolyte shows a high tensile strength of 43.43 MPa and an impressive Young's modulus of 496 MPa,which are increased by 1205%and 6048%over those of PEO.Meanwhile,the ionic conductivity of GFC@PEO-1 wt%MXene at 60℃ reaches 5.01×10^(-2) S m^(-1),which is increased by around 200%compared with that of GFC@PEO electrolyte.In addition,the Li/Li symmetric battery based on GFC@PEO-1 wt%MXene electrolyte shows an excellent cycling stability over 800 h(0.3 mA cm^(-2),0.3 mAh cm^(-2)),which is obviously longer than that based on PEO and GFC@PEO electrolytes due to the better compatibility of GFC@PEO-1 wt%MXene electrolyte with Li anode.Furthermore,the solid-state Li/LiFePO_(4) battery with GFC@PEO-1 wt%MXene as electrolyte demonstrates a high capacity of 110.2–166.1 mAh g^(-1) in a wide temperature range of 25–60C,and an excellent capacity retention rate.The developed sandwich structured GFC@PEO-1 wt%MXene electrolyte with the excellent overall performance is promising for next generation high performance all-solid-state lithium metal batteries.
文摘分别采用中红外(MIR)光谱技术(包括:一维 MIR 光谱、二阶导数 MIR 光谱和四阶 MIR 光谱)开展了玻璃布纤维涂层(简称:涂层)的结构研究,实验发现:涂层的红外吸收模式主要包括: ν as CH2-涂层 、 ν s CH2-涂层 、 ν C=O-涂层 、 ν 酰胺-Ⅰ-涂层 、 ν Si-Ar-涂层 和 ν Si-O-Ar-涂层 等;研究发现:涂层的主要化学结构包括:硅树脂、聚酰亚胺和聚氨酯。采用变温中红外(TD-MIR)光谱进一步开展了涂层的热稳定性研究,实验发现:随着测定温度的升高(303 K ~ 393 K),其热稳定性进一步降低,进一步进行了机理研究。研究进一步证明 MIR 光谱和 TD-MIR 光谱在重要的无机材料(玻璃布纤维)涂层结构研究中的重大作用。
