Secondary battery, battery pack, vehicle, and stationary power supply
摘要
說明書
The thickness of the solid electrolyte layer is, for example, 3 μm or more, preferably 5 μm or more. When the thickness of the solid electrolyte layer is thick, the solid electrolyte layer hardly passes an aqueous solvent, and the life of the secondary battery can be increased. The thickness of the solid electrolyte layer can be measured by, for example, scanning electron microscope (SEM) observation.
The thickness of the solid electrolyte layer is, for example, 90 μm or less, preferably 70 μm or less. When the thickness of the solid electrolyte layer is thin, the internal resistance of the secondary battery tends to decrease, and the volumetric energy density of the secondary battery tends to increase.
The solid electrolyte particles have ionic conductivity of alkali metal ions. The solid electrolyte particles are preferably excellent in lithium ion conductivity. The solid electrolyte particles preferably have high waterproofness.
The solid electrolyte particles are preferably the main component of the solid electrolyte layer. From the viewpoint of increasing the denseness of the solid electrolyte layer, the ratio of the solid electrolyte particles in the solid electrolyte layer is preferably 60 mass % or more, more preferably 70 mass % or more, and much more preferably 75 mass % or more.
From the viewpoint of increasing the flexibility of the solid electrolyte layer, the ratio of the solid electrolyte particles in the solid electrolyte layer is preferably 95 mass % or less, more preferably 94 mass % or less, and much more preferably 93 mass % or less. The ratio of the solid electrolyte particles in the solid electrolyte layer can be calculated by thermogravimetry (TG) analysis.
