Non-aqueous electrolytic solution secondary battery and method for producing non-aqueous electrolytic solution secondary battery
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Solution Overview
Problem
The addition of nitrile compounds to non-aqueous electrolyte secondary batteries suppresses metal component elution but increases initial resistance due to the formation of a coating film that acts as a resistance component.
Innovation Solution
A non-aqueous electrolyte secondary battery design where a dinitrile group-containing compound is applied to the outermost circumferential surface and inner wall of the battery case, ensuring a higher concentration of the compound on the surface compared to the inner region, thereby minimizing the formation of a resistance-inducing coating film and reducing metal elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nitrile compound is added to the non-aqueous electrolyte, then metal component elution is suppressed, but initial resistance increases
Solution Approach 1:
The patent applies dinitrile group-containing compound specifically to the outermost circumferential surface of the wound electrode assembly and the inner wall of the battery case, creating a localized protective layer only where metal elution occurs. This localized application suppresses metal elution at the boundaries while avoiding formation of resistance-inducing coating films in the bulk electrolyte, thereby resolving the contradiction between metal elution suppression and initial resistance control.
2Reliability
If dinitrile group-containing compound is applied to suppress metal elution, then a coating film is formed, but this coating film acts as a resistance component
Solution Approach 1:
The patent creates a localized protective coating only on the outermost circumferential surface and battery case inner wall where metal elution is most severe, rather than allowing uniform coating throughout the electrolyte. This localized approach suppresses metal elution at critical interfaces while minimizing the formation of resistance-inducing coating films in the bulk electrolyte, resolving the contradiction between protective coating formation and resistance control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses metal elution into the electrolyte and prevents an increase in initial battery resistance by controlling the nitrogen element concentration ratios, maintaining battery performance.
Implementation Method 1
a dinitrile group-containing compound is applied to an outermost circumferential surface of a wound electrode assembly... applying a dinitrile group-containing compound to an inner wall of a battery case
Implementation Method 2
A1 is a nitrogen element concentration derived from a dinitrile group-containing compound in an outermost circumferential surface... B is a nitrogen element concentration derived from a dinitrile group-containing compound in an inner region inside the outermost circumferential surface... a relationship of A1>B is satisfied
Data Source
AI summary
This non-aqueous electrolytic solution secondary battery has a wound electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a non-aqueous electrolytic solution, and a battery case for accommodating the wound electrode body and the non-aqueous electrolytic solution. The relationship between the elemental nitrogen concentration A1 derived from a dinitrile-group-containing compound in an outermost circumferential surface of the wound electrode body, and the elemental nitrogen concentration B derived from a dinitrile-group-containing compound in an inner region located further inward than the outermost circumferential surface of the wound electrode body, satisfies A1>B.