电解质
聚偏氟乙烯
材料科学
锂(药物)
阳极
氟化锂
化学工程
电极
枝晶(数学)
快离子导体
无机化学
准固态
化学
复合材料
聚合物
色素敏化染料
物理化学
内分泌学
工程类
医学
数学
几何学
作者
Boyu Li,Huan Wang,Weitao Zhou,Fan Liu,Jianxin He,Gaohui Du,Qingmei Su
标识
DOI:10.1016/j.jallcom.2023.172352
摘要
Solid-state lithium (Li) metal batteries (LMBs) are promising owing to enhanced safety and high energy density. However, the issues of Li dendrite growth and large electrolyte-electrode interfacial resistance still hinder their practical applications in LMBs. Here, a Li anode-electrolyte structure integration has been developed using in-situ chemical reactions between the polyvinylidene fluoride/Li3xLa2/3−xTiO3/N-methyl pyrrolidone (PVDF/LLTO/NMP) solution and the Li metal interphase. After gradually coating the PVDF/LLTO/NMP solution onto Li metal, NMP as catalyst, inducing PVDF reacted with Li spontaneously to form lithium fluorine (LiF), and the accompanying Ti4+ ions (in LLTO) are reduced to Ti3+ ions to form a LLTO ionic/electronic conductor (LixLLTO). After NMP evaporation, an ionic/electronic conductor protective layer of LiF/LixLLTO is created between the PVDF/LLTO electrolytes and Li metal. When applying the integrated solid-state Li batteries (ISSLBs), the protective layer can reduce interfacial resistance and the formation of Li dendrites by regulating the even Li deposition redistributing the Li-ion transport. As a result, the as-assembled LiNi0.8Co0.1Mn0.1O2/ISSLBs achieves an initial capacity of 181 mA h g−1 and retains 83% capacity after 200 cycles at 0.5 C. This design can be an effective strategy to tailor the properties of Li-metal anodes for achieving dendrite-free LMBs with high performance and high safety.
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