A Low Temperature Soldered All Ceramic Lithium Battery

The oxide-based all ceramic lithium battery (ACLB) is regarded as one of the safest secondary batteries because it is incombustible and free of toxic gas release. However, high temperature sintering is a necessary step to fabricate the solid-state electrolytes (SSEs) membranes and improve the cathode/SSEs interfacial contact, which bring in high energy consumption as well as the formation of Li-ion resistive interdiffusion phases. Here, we report an in situ coating of lithium-rich antiperovskites (LiRAPs) as sintering aids to solder LiCoO2 (LCO) active material and Li1.3Al0.3Ti1.7(PO4)(3) (LATP) solid electrolyte. Due to the low melting point of LiRAPs (273.2 degrees C), all particles were compactly soldered to simultaneously densify the electrolyte membrane and reinforce the cathode/electrolyte contact, thus lowing the sintering temperature of ACLB from over 600 degrees C to only 290 degrees C. The interfacial resistance of cathode/electrolyte was reduced from 15 288 to 817 Omega/cm(2) due to the high ionic conductivity of LiRAPs and the interdiffusion phases prohibition. Moreover, the outstanding ductility of LiRAPs also mitigated the strain/stress of the LCO/LATP interface, which lead to improved cycling stability. These results not only provide a rational design to the cathode/SSEs interface but also deliver a practical stacking process to speeding up the industrialization of ACLB.