SEPARATOR FOR NONAQUEOUS ELECTROLYTE SOLUTION SECONDARY BATTERY
To prevent deterioration in battery characteristic and/or safety, caused by deformation of a separator due to stress that occurs with volume expansion of a negative electrode at charging and discharging.SOLUTION: In a separator for a nonaqueous electrolyte solution secondary battery, when X of a str...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To prevent deterioration in battery characteristic and/or safety, caused by deformation of a separator due to stress that occurs with volume expansion of a negative electrode at charging and discharging.SOLUTION: In a separator for a nonaqueous electrolyte solution secondary battery, when X of a stress distortion curve resulting from a tensile test is in the range of 0 to 7.0 mm, the maximum value of a secondary differential value calculated based on a primary differential value obtained for each elongation quantity of 0.5 mm is 0.15 or more.SELECTED DRAWING: Figure 1
【課題】充放電時の負極の容積膨張に伴う応力によるセパレータの変形に起因する、電池特性および／または安全性の低下を防止すること。【解決手段】引張試験の結果得られる応力ひずみ曲線のＸが０～７．０ｍｍの範囲において、０．５ｍｍ間隔の伸び量毎に求めた一次微分値に基づいて算出した二次微分値の最大値が、０．１５以上である、非水電解液二次電池用セパレータ。【選択図】図１ |
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