Interface modification between Ta, Al-doped Li.sub.7La.sub.3Zr.sub.2O.sub.12 solid electrolyte and LiNi.sub.1/3Co.sub.1/3Mn.sub.1/3O.sub.2 cathode in all-solid-state batteries

The critical issue of high resistance at the interface between cathode and solid electrolyte for creating all-solid-state power sources can be addressed by introducing a low-melting additive (Li.sub.3BO.sub.3) and lithium-conducting solid electrolyte (Li.sub.7La.sub.3Zr.sub.2O.sub.12) in the LiNi.sub.1/3Co.sub.1/3Mn.sub.1/3O.sub.2 cathode mass. The chemical and thermal stability of the solid electrolyte in contact with LiNi.sub.1/3Co.sub.1/3Mn.sub.1/3O.sub.2 and Li.sub.3BO.sub.3 was studied using XRD and DSC analysis. It was found that the introduction of 5 wt% Li.sub.3BO.sub.3 in LiNi.sub.1/3Co.sub.1/3Mn.sub.1/3O.sub.2 leads to a close contact between the solid electrolyte and cathode and a decrease in the interfacial resistance from 45000 to 85 [Omega] cm.sup.2 at 300 °C compared to pure LiNi.sub.1/3Co.sub.1/3Mn.sub.1/3O.sub.2. The addition of 5 wt% lithium-conductive electrolyte to the cathode mass does not lead to significant changes in interface resistance. No degradation processes in the components of the experimental cell with composite cathode and Li anode were found during electrochemical experiments.