LDH SEPARATOR AND ZINC SECONDARY BATTERY

To provide an LDH separator capable of further improving the yield of a battery while having excellent cycle durability performance.SOLUTION: An LDH separator includes a porous substrate, and a surface layer provided on at least one surface of a porous substrate and containing a hydroxide ion-conducting layered compound that is a layered double hydroxide (LDH) and/or a layered double hydroxide (LDH)-like compound. This LDH separator includes a surface layer residual portion where the surface layer exists, and a surface layer peeling portion where the surface layer does not exist when the surface on the surface layer side is observed with a scanning electron microscope (SEM), and the surface layer residual ratio, which is the ratio of the area of the surface layer residual portion to the total area of the surface layer residual portion and the surface layer peeled portion, is 80 to 99%.SELECTED DRAWING: Figure 1 【課題】サイクル耐久性能に優れながらも、電池の歩留まりをより一層向上可能なＬＤＨセパレータを提供する。【解決手段】多孔質基材と、多孔質基材の少なくとも一方の表面に設けられ、層状複水酸化物（ＬＤＨ）及び／又は層状複水酸化物（ＬＤＨ）様化合物である水酸化物イオン伝導層状化合物を含む、表層とを備えたＬＤＨセパレータ。このＬＤＨセパレータは、表層側の表面を走査型電子顕微鏡（ＳＥＭ）で観察した場合に、表層が存在する表層残存部と、表層が存在しない表層剥離部とを有し、表層残存部及び表層剥離部の合計面積に対する、表層残存部の面積の割合である表層残存率が８０～９９％である。【選択図】図１