| abstract |
The present invention relates to a battery separator, a lithium battery, and a method for producing the same. Provided are a battery separator with few voids, a lithium battery including the battery separator, and a method for producing the same. A battery separator is a battery separator comprising an oxide electrolyte sintered body and a resin, wherein the oxide electrolyte sintered body has grain boundaries between crystal grains of a garnet-type ion conductive oxide, and the crystal grains The number-average grain size is 3 μm or less, the ion conduction resistance inside the crystal grains, that is, the intragranular resistance value is R b , and the ion conduction resistance at the grain boundary between the crystal grains, that is, the grain boundary resistance value is R In the case of gb , the following formula 1 is satisfied. Formula 1: R gb /(R b +R gb )≦0.6. |