A Self-Limited Free-Standing Sulfide Electrolyte Thin Film for All-Solid-State Lithium Metal Batteries
A Self-Limited Free-Standing Sulfide Electrolyte Thin Film for All-Solid-State Lithium Metal Batteries
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用于全固态锂金属电池的自限独立硫化物电解质薄膜
DOI：
10.1002/adfm.202101985
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发表时间：
2021
影响因子：
19
通讯作者：
Zhang Qiang
中科院分区：
文献类型：
--
作者：
Zhu Gao-Long;Zhao Chen-Zi;Peng Hong-Jie;Yuan Hong;Hu Jiang-Kui;Nan Hao-Xiong;Lu Yang;Liu Xin-Yan;Huang Jia-Qi;He Chuanxin;Zhang Jian;Zhang Qiang
全固态（ASS）锂金属电池（LMB）因其上级安全性和高能量密度而被认为是最有前途的下一代电池。为了获得ASS LMB实际所需的高能量密度，具有快速离子传输能力的固态电解质（SSE）薄膜是降低ASS电池中非活性材料比例的不可替代的组件。在这篇文章中，通过自限策略设计了一种可弯曲（60µm），柔性和独立的argyrodite（Li6PS5Cl）SSE薄膜。采用化学相容的纤维素膜作为自限性骨架，不仅限定了硫化物SSE膜的厚度，还增强了其机械性能。SSE薄膜的离子电导率在室温下高达6.3×10−3S cm− 1，可实现快速锂离子传输。自限性SSE薄膜在具有不同类型的阴极（硫和钛酸锂）和阳极材料（锂和锂铟合金）的各种ASS LMB中在模制电池和袋状电池水平上进行了评估，证明了稳定的性能和高倍率能力。该研究为高能量密度ASS电池的SSE薄膜的合理设计提供了一般策略。
All‐solid‐state (ASS) lithium metal batteries (LMBs) are considered the most promising next‐generation batteries due to their superior safety and high projected energy density. To access the practically desired high energy density of ASS LMBs, an ultrathin solid‐state electrolyte (SSE) film with fast ion‐transport capability presents as an irreplaceable component to reduce the proportion of inactive materials in ASS batteries. In this contribution, an ultrathin (60µm), flexible, and free‐standing argyrodite (Li6PS5Cl) SSE film is designed through a self‐limited strategy. A chemically compatible cellulose membrane is employed as the self‐limiting skeleton that not only defined the thinness of the sulfide SSE film but also strengthened its mechanical properties. The ionic conductivity of the SSE film reaches up to 6.3×10−3S cm−1at room temperature, enabling rapid lithium‐ion transportation. The self‐limited SSE thin films are evaluated in various ASS LMBs with different types of cathode (sulfur and lithium titanate) and anode materials (lithium and lithium‐indium alloy) at both mold‐cell and pouch‐cell levels, demonstrating a stable performance and high‐rate capability. This study provides a general strategy for the rational design of an SSE thin film towards high‐energy‐density ASS batteries.