Solid-state lithium metal batteries attract much attention for their high theoretical specific capacity and safety. However, the poor interfacial combination between the solid electrolyte (SE) and Li anode usually results in unavoidable growth of Li dendrites and interfacial side reactions. In this work, we propose a simple and effective strategy to modify the interface of the electrolyte/Li anode by scraping a graphite layer on the electrolyte surface facing the anode. The graphite-modified solid electrolyte (G-SE) has a high electrochemical potential window exceeding 4.6 V and high ion conductivity of 3.08 × 10^–4 S·cm^–2 at ambient temperature. This G-SE membrane is suitable for high-voltage solid-state lithium metal batteries, the assembled NCM622/G-SE/Li cell shows an initial capacity of 160 mAh/g at 0.5 C and a retention capacity of 100 mAh/g after 200 cycles. The good electrochemical performance is attributed to the graphite interfacial modification; the graphite coating and Li can spontaneously react to form a LiC₆ layer, which improves the SE/Li interfacial combination and suppresses the growth of lithium dendrites and interfacial side reactions.

中文翻译：

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高效石墨涂层在聚碳酸亚丙酯固体电解质与锂阳极之间的高效界面改性

固态锂金属电池具有较高的理论比容量和安全性，因此备受关注。但是，固体电解质（SE）和Li阳极之间不良的界面结合通常会导致不可避免的Li树枝状晶体的生长和界面副反应。在这项工作中，我们提出了一种简单有效的策略，通过在面对阳极的电解质表面上刮擦石墨层来修改电解质/ Li阳极的界面。石墨改性的固体电解质（G-SE）具有超过4.6 V的高电化学电势窗口和3.08×10 ^–4 S·cm ^–2的高离子电导率在环境温度下。该G-SE膜适用于高压固态锂金属电池，组装后的NCM622 / G-SE / Li电池在0.5 C时的初始容量为160 mAh / g，在放电后的保留容量为100 mAh / g 200个周期。良好的电化学性能归因于石墨的界面改性。石墨涂层和Li可以自发反应形成LiC ₆层，从而改善SE / Li界面结合并抑制锂树枝状晶体的生长和界面副反应。