POWER STORAGE DEVICE

To provide a power storage device which enables the enhancement of the voltage endurance of an electrolyte solution and the suppression of the decrease in negative electrode capacity.SOLUTION: A power storage device comprises: a positive electrode including a positive electrode material; a negative...

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Bibliographische Detailangaben
Hauptverfasser:	MIZUMA KOTARO, LI KUI, SHA TAKESHI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BASIC ELECTRIC ELEMENTS CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Beschreibung
Zusammenfassung:	To provide a power storage device which enables the enhancement of the voltage endurance of an electrolyte solution and the suppression of the decrease in negative electrode capacity.SOLUTION: A power storage device comprises: a positive electrode including a positive electrode material; a negative electrode including a negative electrode material; and an electrolyte solution containing a nonaqueous solvent and an electrolyte salt dissolved in the nonaqueous solvent. The negative electrode material includes a carbon material capable of occluding and desorbing lithium ions. The activation energy of a negative electrode reaction of the electrolyte solution is 66 kJ/mol or more and 73 kJ/mol or less.SELECTED DRAWING: Figure 1 【課題】電解液の耐電圧性を向上できると共に、負極容量の低下を抑制することができる蓄電デバイスを提供する。【解決手段】蓄電デバイスは、正極材料を含む正極と、負極材料を含む負極と、非水溶媒及び該非水溶媒に溶解した電解質塩を含む電解液とを備える。負極材料は、リチウムイオンを吸脱着可能な炭素材料を含む。電解液の負極反応の活性化エネルギーは、６６ｋＪ／ｍｏｌ以上７３ｋＪ／ｍｏｌ以下である。【選択図】図１