Secondary battery, battery pack, vehicle, and stationary power supply
摘要
說明書
If the ratio of the portion formed from the first monomer unit in the polymeric material is lower than 70 mol %, the solid electrolyte layer may readily pass water, and as a result, the charge-and-discharge efficiency of the battery may lower. The ratio of the portion formed from the first monomer unit in the polymeric material is preferably 90 mol % or more. More preferably, the ratio of the portion formed from the first monomer unit in the polymeric material is preferably 100 mol %, that is, the polymeric material is a polymer formed from only the first monomer unit.
The first monomer unit may be a compound whose side chain has a functional group including one type or two or more types of elements selected from the group consisting of oxygen (O), sulfur (S), nitrogen (N), and fluorine (F) and whose main chain is formed from a carbon-to-carbon bond. The hydrocarbon may have one type or two or more types of functional groups each including one type or two or more types of elements selected from the group consisting of oxygen (O), sulfur (S), nitrogen (N), and fluorine (F). The functional group in the first monomer unit raises the conductivity of the alkali metal ions that pass through the solid electrolyte layer.
The hydrocarbon that forms the first monomer unit preferably has a functional group including at least one element selected from the group consisting of oxygen (O), sulfur (S), and nitrogen (N). When the first monomer unit has such a functional group, the conductivity of the alkali metal ions in the solid electrolyte layer tends to further rise so as to lower the internal resistance.
