LITHIUM ION SECONDARY BATTERY

To provide a novel lithium ion secondary battery with excellent performance.SOLUTION: A lithium ion secondary battery comprising a Si-containing negative electrode active material, and an electrolyte containing a lithium salt and a potassium salt and a fluorine-containing cyclic carbonate is provide...

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Bibliographic Details
Main Authors KIMIJIMA TAKEYUKI, EGUCHI TATSUYA, SUGIYAMA YUSUKE, MASE KOHEI, SUGIOKA TAKAHIRO
Format Patent
LanguageEnglish
Japanese
Published 20.02.2020
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Summary:To provide a novel lithium ion secondary battery with excellent performance.SOLUTION: A lithium ion secondary battery comprising a Si-containing negative electrode active material, and an electrolyte containing a lithium salt and a potassium salt and a fluorine-containing cyclic carbonate is provided. The concentration of the lithium salt in the electrolyte is 1.5 to 3.5 mol/L, and the molar ratio of the potassium salt to the lithium salt is 0.01 to 0.05.SELECTED DRAWING: None 【課題】性能に優れる新たなリチウムイオン二次電池を提供する。【解決手段】Ｓｉ含有負極活物質と、リチウム塩及びカリウム塩並びにフッ素含有環状カーボネートを含む電解液とを具備するリチウムイオン二次電池であって、電解液におけるリチウム塩の濃度が１．５〜３．５ｍｏｌ／Ｌであり、リチウム塩に対するカリウム塩のモル比が、０．０１〜０．０５である。【選択図】なし
Bibliography:Application Number: JP20180151741