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Shaping the Contact between Li Metal Anode and Solid- State Electrolytes

机译：改善锂金属阳极与固态电解质之间的接触

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摘要

Scientific and technological interest in solid-state Li metal batteries (SSLMBs) arises from their excellent safety and promising high energy density. However, the practical application of SSLMBs is hindered by poor contact between the Li metal anode (LMA) and solid-state electrolytes (SSEs). To circumvent this limitation, a pattern-guided approach that shapes the LMA/SSE contact is disclosed to offer fast Li ion conduction in the interface. A thermally-treated copper foam is used as the lithophilic pattern to confine and guide Li for forming a tight contact with garnet-type SSE. The contact can be easily manipulated according to the shape of lithiophilic pattern, facilitating cell assembly. The resulting Li|patterned garnet|Li symmetric cell exhibits an interfacial resistance of 9.8 omega cm(2), which is dramatically lower than that of 998 omega cm(2) for Li|pristine garnet|Li symmetric cell. Being used in Li-sulfur batteries, the patterned garnet effectively eliminates the polysulfide shuttle and enables stable cycling performance, showing a low capacity decay of 0.035% per cycle over 1000 cycles. The fundamental contact process of metallic anodes/SSEs is carefully investigated. This contact strategy provides a new design concept to improve the interface wettability via a lithiophilic pattern for a variety of SSEs that cannot wet with metallic anodes.
机译：固态锂金属电池（SSLMBs）的科学技术发展源于其出色的安全性和有希望的高能量密度。但是，锂金属阳极（LMA）与固态电解质（SSE）之间的接触不良会阻碍SSLMB的实际应用。为了避免这种限制，公开了一种使LMA / SSE接触成形的图形引导方法，以在界面中提供快速的Li离子传导。热处理的铜泡沫用作亲石图案，以限制和引导Li与石榴石型SSE形成紧密接触。根据亲硫性图案的形状，可以容易地操纵接触，从而促进细胞组装。所得的石榴石锂对称电池的界面电阻为9.8Ω·cm（2），远低于锂石榴石锂对称电池的998Ω·cm（2）。图案化的石榴石可用于锂硫电池，有效消除多硫化物穿梭，并实现稳定的循环性能，在1000次循环中显示出每循环0.035％的低容量衰减。仔细研究了金属阳极/ SSE的基本接触过程。这种接触策略提供了一种新的设计概念，可通过亲硫性图案改善无法用金属阳极润湿的各种SSE的界面润湿性。

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