NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY LAMINATED SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MEMBER, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR PRODUCING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR

NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY LAMINATED SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MEMBER, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR PRODUCING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR

Provided is a nonaqueous electrolyte secondary battery including a porous film containing polyolefin as a main component, the nonaqueous electrolyte secondary battery separator having a parameter X of not more than 20, the parameter X being calculated based on the following equation: X=100×|MD tan δ...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HASHIWAKI Hiroki, MURAKAMI Chikara
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:Provided is a nonaqueous electrolyte secondary battery including a porous film containing polyolefin as a main component, the nonaqueous electrolyte secondary battery separator having a parameter X of not more than 20, the parameter X being calculated based on the following equation: X=100×|MD tan δ−TD tan δ|/{(MD tan δ+TD tan δ)/2}, where MD tan δ is tan δ in a machine direction of the porous film and TD tan δ is tan δ in a transverse direction of the porous film, MD tan δ and TD tan δ each being obtained by viscoelasticity measurement carried out with respect to the porous film at a frequency of 10 Hz and a temperature of 90° C., the nonaqueous electrolyte secondary battery separator making it possible to reduce an increase in internal resistance which increase is caused by repeated charge and discharge.