The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2025
Filed:
Nov. 28, 2018
Vehicle Energy Japan Inc., Hitachinaka, JP;
VEHICLE ENERGY JAPAN INC., Ibaraki, JP;
Abstract
An electrolyte solution for lithium ion secondary cell capable of suppressing a decomposition reaction of a graphite negative electrode by optimizing an amount of a cyclic carbonate, and capable of improving a cell performance in a low temperature range. The electrolyte solution for lithium ion secondary cell of the present invention includes; 10 volume % to 20 volume % of ethylene carbonate (EC) and/or propylene carbonate (PC) as a cyclic carbonate; 0.38 mol/L to 0.75 mol/L of at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), or lithium bis(oxalate) borate (LiBOB) as a first lithium salt; and a lithium imide salt. A sum of the lithium imide salt and the first lithium salt is in a range of 0.5 mol/L to 1.5 mol/L, and a mole ratio of the cyclic carbonate/the first lithium salt is in a range of 3 to 5.