Garnet-Based All-Ceramic Lithium Battery Enabled by Li_2.985B_0.005OCl Solder.

ABSTRACT: 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 in situ coated Li_2.985B_0.005OCl as sintering solder, which is uniformly coated on both LiCoO₂ and Li₇La₃Zr₂O₁₂. With the low melting point (267°C) and high ionic conductivity (6.8 × 10^-5 S cm^-1), the Li_2.985B_0.005OCl solder not only restricts La/Co interdiffusion, but also provides fast Li⁺ transportation in the cathode. A low cathode/electrolyte interfacial resistance (386 ? cm²) is realized owing to the densification of the ACLB by hot-press sintering. The strain/stress of the LiCoO₂ is also released by the small elasticity modulus of Li_2.985B_0.005OCl, 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.

SUBMITTER: Feng W 

PROVIDER: S-EPMC7195548 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature