SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND USE THEREOF

• Main Author: YONEYAMA MASASHI
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a separator for a nonaqueous electrolyte secondary battery, which is superior in voltage endurance characteristic.SOLUTION: A separator for a nonaqueous electrolyte secondary battery has a film thickness of 20 μm or less, of which the peel strength measured in a blocking test is 0.2 N or more, and the rate of change of a thrusting strength before and after the blocking test is 15% or less. The blocking test is a test including the steps of: fastening a pair of 80-mm square separators by 100-mm square parts of a jig; subsequently leaving the pair of separators at rest with a 3.5-kg load applied thereto under an atmosphere of 133±1°C for 30 minutes; after that, removing the load therefrom, followed by cooling to a room temperature; cutting down test pieces of 27×80 mmfrom the pair of separators; and measuring the peel strength of the test pieces under the condition of 100 mm/min.SELECTED DRAWING: None 【課題】耐電圧特性に優れた非水電解液二次電池用セパレータを提供する。【解決手段】非水電解液二次電池用セパレータは、膜厚が２０μｍ以下であり、ブロッキング試験で測定される剥離強度が０．２Ｎ以上であり、ブロッキング試験前後の突刺強度の変化率が１５％以下である。ブロッキング試験は、８０ｍｍ×８０ｍｍの２枚のセパレータを、１００ｍｍ×１００ｍｍの治具で挟み込み、３．５ｋｇの荷重をかけながら１３３℃±１℃の雰囲気下で３０分静置した後、前記荷重を取り除き、室温まで冷却した後に、２７ｍｍ×８０ｍｍの試験片に切り出し、当該試験片に対して１００ｍｍ／ｍｉｎの条件で剥離強度を測定する試験である。【選択図】なし