Enabling Fast Ionic Conductivity and Stable Interfaces of Composite Polymer Electrolytes by Incorporating Borohydride‐Oxide Dual Fillers for Solid State Lithium Metal Batteries

IF 6.5 3区 材料科学 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Shunqin Zeng, Kaixiang Ren, Xiaoli Ding, Hai‐Wen Li, Yongtao Li, Qingan Zhang
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Abstract

Poly ethylene oxide (PEO) composite polymer electrolytes (CPEs) are one of the most promising candidates for all‐solid‐state batteries with high energy density, flexibility and safety. However, the applications of PEO with practicability have been refrained from its poor tensile strength, limited Li‐ion migration and ionic conductivity. In this work, the compact and stable flexible CPEs are prepared by PEO matrix with dual‐fillers of LiBH4 and Al2O3, where Al2O3 with Lewis acid sites can weaken the complexation of Li+ and PEO as well as enhance the dissociation of Li salts. Meanwhile LiBH4 acts as fast ion conductor to provide free Li+ at the interfaces between fillers and PEO. Benefiting from their synergistic effects, both ionic conductivity and interface stability between electrolyte and anode of CPEs are improved greatly while the lithium dendrites is also inhibited. As a result, the PEO/Lithium bis(trifluoromethanesulfonyl)imide(LiTFSI)/(4%LiBH4/4%γ‐Al2O3) CPEs exhibit a high ionic conductivity of 0.3 mS cm−1 and the Li‐Li symmetrical battery can cycle for 800 h at 60 °C. The LiFePO4.

Abstract Image

通过在固态金属锂电池中加入硼氢化氧化物双填料,实现复合聚合物电解质的快速离子传导性和稳定界面
聚环氧乙烷(PEO)复合聚合物电解质(CPE)是全固态电池最有前途的候选材料之一,具有高能量密度、灵活性和安全性。然而,由于 PEO 的拉伸强度差、锂离子迁移和离子导电性能有限,其实际应用一直受到限制。Al2O3 具有路易斯酸位点,可减弱 Li+ 与 PEO 的络合,并增强锂盐的解离。同时,LiBH4 可作为快速离子导体,在填料和 PEO 之间的界面上提供自由 Li+。得益于它们的协同作用,CPE 的离子导电性和电解质与阳极之间的界面稳定性都得到了极大改善,同时锂枝晶也受到了抑制。因此,PEO/双(三氟甲烷磺酰)亚胺锂(LiTFSI)/(4%LiBH4/4%γ-Al2O3)CPE 的离子电导率高达 0.3 mS cm-1,锂-锂对称电池在 60 °C 下可循环使用 800 小时。LiFePO4.
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来源期刊
Advanced Sustainable Systems
Advanced Sustainable Systems Environmental Science-General Environmental Science
CiteScore
10.80
自引率
4.20%
发文量
186
期刊介绍: Advanced Sustainable Systems, a part of the esteemed Advanced portfolio, serves as an interdisciplinary sustainability science journal. It focuses on impactful research in the advancement of sustainable, efficient, and less wasteful systems and technologies. Aligned with the UN's Sustainable Development Goals, the journal bridges knowledge gaps between fundamental research, implementation, and policy-making. Covering diverse topics such as climate change, food sustainability, environmental science, renewable energy, water, urban development, and socio-economic challenges, it contributes to the understanding and promotion of sustainable systems.
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