Garnet-Based All-Ceramic Lithium Battery Enabled by Li2.985B0.005OCl Solder

摘要

Garnet-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 an coated Li B OCl as sintering solder, which is uniformly coated on both LiCoO and Li La Zr O . With the low melting point (267°C) and high ionic conductivity (6.8 × 10 S cm ), the Li B OCl solder not only restricts La/Co interdiffusion, but also provides fast Li transportation in the cathode. A low cathode/electrolyte interfacial resistance (386 Ω cm ) is realized owing to the densification of the ACLB by hot-press sintering. The strain/stress of the LiCoO is also released by the small elasticity modulus of Li B OCl, 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.