The ultrathin insulating LiF coating with controllable thickness is proposed as an interfacial layer for garnet electrolytes to inhibit the formation of Li dendrites, and promote uniform Li plating/stripping.

A novel gold-catalyzed tandem alkyne amination/intramolecular O–H insertion has been developed. A variety of [1,4]oxazino[3,2-c]isoquinolines are readily accessed under mild reaction conditions by utilizing this strategy, thereby providing an efficient and practical route for the construction of synthetically useful fused isoquinolines.

All-solid-state Li metal batteries (ASSLBs) are currently regarded as one of the most promising next-generation energy storage technologies because of their great potential in realizing both high energy density and safety. However, the development of high performance ASSLBs is still restricted by the large interfacial resistance and Li dendrite propagation within solid electrolytes. Herein, a simple and efficient interfacial modification strategy is proposed to improve the interfacial contact between Li and Li6.4La3Zr1.4Ta0.6O12 (LLZTO) by introducing a uniform and thin Li2Se buffer layer. The Li2Se buffer layer formed by an in situ conversion reaction can not only enhance the wettability of lithium metal toward LLZTO electrolyte but also facilitate uniform lithium plating/stripping. As a result, the interfacial resistance of Li/LLZTO decreased from 270.5 to 5.1 Ω cm2, and the lithium symmetric cell can cycle stably for 350 h at a current density of 0.5 mA cm–2. Meanwhile, the Li|LLZTO-Li2Se|LiNi0.8Co0.1Mn0.1O2 full cells exhibit a high initial capacity of 162.3 mAh g–1 and good cycling stability with a capacity retention of 84.3% after 100 cycles at 0.2 C. These results prove the effectiveness of this modification method and provide new design strategies for the development of high performance ASSLBs.

A series of oxazinoisoquinolines is prepared by a tandem alkyne amination/intramolecular O—H insertion.