摘要：SummaryGarnet-based bulk-type all-ceramic lithium battery (ACLB) is considered to be highly safe, but its electrochemical performance is severely hindered by the huge cathode/electrolyte interfacial resistance. Here, we demonstrate anin situcoated Li2.985B0.005OCl as sintering solder, which is uniformly coated on both LiCoO2and Li7La3Zr2O12. With the low melting point (267°C) and high ionic conductivity (6.8 × 10−5S cm−1), the Li2.985B0.005OCl solder not only restricts La/Co interdiffusion, but also provides fast Li+transportation in the cathode. A low cathode/electrolyte interfacial resistance (386 Ω cm2) is realized owing to the densification of the ACLB by hot-press sintering. The strain/stress of the LiCoO2is also released by the small elasticity modulus of Li2.985B0.005OCl, leading to a superior cycling stability. The study sheds light on the design of advanced garnet-based bulk-type ACLB by exploring proper solders with higher ionic conductivity, lower melting point, and smaller elasticity modulus.Graphical AbstractDisplay OmittedHighlights•Hot-press sintering is developed in densifying the all-ceramic lithium battery•Li2.985B0.005OCl displays a high ionic conductivity and a low melting point•Li2.985B0.005OCl layer isin situcoated on both garnet and LiCoO2uniformly•The strain/stress effects of the LiCoO2is released during charge/dischargeEnergy Materials; Energy Storage; Mechanical Property
