(2,3) In the proposed mechanisms of the increased interface resistance, one of the most plausible origins of the increased interface resistance is the chemical side reaction at the interface.
(1) However, the large resistance at the interface between the solid electrolyte and positive electrode (electrolyte–electrode interface resistance) considerably deteriorates their performance. These results provide fundamental insights into the fabrication of high-performance all-solid-state Li batteries.Īll-solid-state Li batteries have become promising next-generation batteries owing to their high energy density and charge–discharge cyclability. First-principles calculations reveal that the protons incorporated into the LiCoO 2 structure are spontaneously deintercalated during annealing to restore the low-resistance interface. The magnitude can be reduced to the initial value (10.3 Ω cm 2) by annealing the sample in a battery form. Exposing the LiCoO 2 positive electrode surface to H 2O vapor increases the resistance by more than 10 times (to greater than 136 Ω cm 2). This report demonstrates that drastic reduction of the resistance is achievable by annealing the entire battery cell. However, an effective method of reducing this resistance has not been developed. It is well known that the interface resistance increases when the electrode surface is exposed to air. The origin of electrical resistance at the interface between the positive electrode and solid electrolyte of an all-solid-state Li battery has not been fully determined.
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