NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

A negative electrode comprises a negative electrode collector, a first negative electrode mixture layer, and a second negative electrode mixture layer the ratio of the void fraction (S2) among the graphite particles in the second negative electrode mixture layer to the void fraction (S1) among the g...

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Bibliographische Detailangaben
Hauptverfasser:	Sunano, Taizou, Yokoi, Mai, Sugii, Noriko, Shinomiya, Takuya
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	A negative electrode comprises a negative electrode collector, a first negative electrode mixture layer, and a second negative electrode mixture layer the ratio of the void fraction (S2) among the graphite particles in the second negative electrode mixture layer to the void fraction (S1) among the graphite particles in the first negative electrode mixture layer, namely S2/S1 is from 1.1 to 2.0: and the ratio of the packing density (D2) of the second negative electrode mixture layer to the packing density (D1) of the first negative electrode mixture layer, namely D2/D1 is from 0.9 to 1.1. A separator has a first surface that is in contact with a positive electrode and a second surface that is in contact with the negative electrode; and the contact angle of the first surface with ethylene carbonate is smaller than the contact angle of the second surface with ethylene carbonate.