Scientists reduce all-solid-state battery resistance by heating

Science Daily  January 7, 2022
The interface between the positive electrode and solid electrolyte in an all-solid state battery shows a large electrical resistance, and the resistance increases when the electrode surface is exposed to air, degrading the battery capacity and performance. Researchers in Japan demonstrated that drastic reduction of the resistance is achievable by annealing the entire battery cell. Exposing the LiCoO2 positive electrode surface to H2O vapor increases the resistance by more than 10 times (to greater than 136 Ω cm2). The magnitude can be reduced to the initial value (10.3 Ω cm2) by annealing the sample in a battery form. First-principles calculations revealed that the protons incorporated into the LiCoO2 structure are spontaneously deintercalated during annealing to restore the low-resistance interface. The findings provide fundamental insights into the fabrication of high-performance all-solid-state Li batteries…read more. Open Access TECHNICAL ARTICLE 

Graphical abstract. Credit: ACS Appl. Mater. Interfaces 2022, XXXX, XXX, XXX-XXX, January 6, 2022