LITHIUM ION SECONDARY BATTERY PRODUCTION METHOD AND LITHIUM ION SECONDARY BATTERY

[Problem] To provide a lithium ion secondary battery production method capable of preventing lithium metal from being deposited on a negative electrode surface in an initial charging step of charging the lithium ion secondary battery to a fully-charged state to increase battery capacity. [Solution]...

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Bibliographische Detailangaben
Hauptverfasser:	SASAKI, Yusuke, UWAI, Kenta, MATSUZAKI, Ikuma, SATO, Masanobu, MIYATAKE, Kazuki
Format:	Patent
Sprache:	eng ; fre ; ger
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:	[Problem] To provide a lithium ion secondary battery production method capable of preventing lithium metal from being deposited on a negative electrode surface in an initial charging step of charging the lithium ion secondary battery to a fully-charged state to increase battery capacity. [Solution] The invention is a production method for a lithium ion secondary battery having, sealed inside an external casing, an electrolytic solution along with a power generating element comprising a positive electrode and a negative electrode layered through a separator, the production method comprising: Step (S14) of charging the lithium ion secondary battery at a lithium ion secondary battery cell voltage range of 4.0 V or lower; Step (S16) of opening the external casing of the lithium ion secondary battery that has been charged at a range of 4.0 V or lower to discharge the gas inside the lithium ion secondary battery to the exterior, and then re-sealing the external casing; and Step (S18) of charging, until the cell voltage is greater than 4.0 V, the lithium ion secondary battery from which the gas has been discharged.