Solid-state lithium batteries (SSLBs) exhibit numerous advantages including high safety, high energy density and power density, etc., and therefore become the most promising candidate for next-generation batteries. However, constructing an intimate contact within the composite electrode and the electrode/electrolyte interface via simple mixing and cold-pressing processes is still challenging. Herein, a novel fabrication process for homogeneous composite electrodes used in SSLBs is successfully demonstrated. An in-situ liquid-phase approach employing the [Li(triglyme)]⁺[TFSI]^- (LiG3) solvent-salt complex with excellent stability to modify the sulfide-based solid-state electrolyte interfaces, is introduced into the SSLBs system, which enables SSLBs to work efficiently at lower external pressures. The quasi-solid-state prototype cells with Li₄Ti₅O₁₂ (LTO) active material deliver excellent room-temperature performance, generating a super high capacity of 160 mA h g^-1 and high capacity retention of 91.4% for 1500 cycles under 0.25 C. This work gives new insight into the interface engineering, processing and more positive impact on the industrial production of SSLBs.

固态锂电池（SSLB）具有许多优点，包括高安全性，高能量密度和功率密度等，因此成为下一代电池的最有希望的候选者。然而，通过简单的混合和冷压过程在复合电极和电极/电解质界面之间建立紧密接触仍然是挑战。在本文中，成功证明了用于SSLB的均质复合电极的新型制造工艺。采用[Li（triglyme）] ⁺ [TFSI]的原位液相方法^-SSLBs系统中引入了具有优异稳定性的（LiG3）溶剂-盐配合物，可修饰基于硫化物的固态电解质界面，这使SSLBs可以在较低的外部压力下高效工作。具有Li ₄ Ti ₅ O ₁₂（LTO）活性材料的准固态原型电池具有出色的室温性能，在0.25的1500次循环下可产生160 mA hg ^-1的超高容量和91.4％的高容量保持率C.这项工作为接口工程，处理提供了新的见解，并对SSLB的工业生产产生了更积极的影响。