Non-aqueous electrolytic solution for lithium secondary battery, lithium secondary battery precursor, method for manufacturing lithium secondary battery, and lithium secondary battery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The rate of increase in normal-temperature resistance during high-temperature storage of lithium secondary batteries is high and needs to be reduced.
Innovation Solution
A non-aqueous electrolytic solution for lithium secondary batteries containing specific compounds, including a compound (I) and additives such as monofluorophosphate, difluorophosphate, or other specific compounds, which form coating films on electrodes to suppress side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium secondary batteries, then the battery can operate normally, but the rate of increase in normal-temperature resistance during high-temperature storage becomes excessively high
Solution Approach 1:
The patent applies preliminary action by introducing compounds (I) and (II) that proactively form protective coating films on electrode surfaces before high-temperature storage conditions cause excessive resistance increase. These compounds react in advance to create stable interface layers that prevent subsequent degradation, thereby reducing the rate of resistance increase during storage while maintaining normal battery operation.
2Temperature
If high-temperature storage is performed, then the battery undergoes aging and resistance increases, but the rate of resistance increase needs to be reduced
Solution Approach 1:
The patent uses compounds (I) and (II) as intermediary substances that mediate between the high-temperature storage environment and the electrode interfaces. These compounds form intermediate coating films that act as buffer layers, reducing the direct harmful impact of high temperature on the electrode-electrolyte interface, thereby suppressing the rate of resistance increase during storage.
3Duration of action of stationary object
If electrolyte decomposition occurs during storage, then battery performance degrades, but this decomposition needs to be minimized
Solution Approach 1:
The patent applies preliminary anti-action by using compounds (I) and (II) to pre-form stable protective films on electrode surfaces before electrolyte decomposition can occur during high-temperature storage. These pre-formed films act as barriers that prevent or reduce electrolyte decomposition reactions, thereby minimizing substance loss and maintaining battery performance over extended storage periods.
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
The solution effectively reduces the rate of increase in normal-temperature resistance during high-temperature storage by forming protective films on electrodes, thereby minimizing electrolyte decomposition.
Implementation Method 1
additives such as monofluorophosphate, difluorophosphate, or other specific compounds, which form coating films on electrodes to suppress side reactions
Implementation Method 2
form coating films on electrodes to suppress side reactions
Data Source
AI summary
One embodiment of the present invention provides a non-aqueous electrolytic solution for a lithium secondary battery, which can allow the rate of increase in normal-temperature resistance during high-temperature storage of a lithium secondary battery to be reduced. A non-aqueous electrolytic solution for a lithium secondary battery, the solution containing a compound (I), and an additive X being at least one selected from the group consisting of a compound (II) being at least one of a monofluorophosphate or a difluorophosphate, a compound (III), a compound (IV), and a compound (V). Each R11 independently represents a fluoro group (—F), a chloro group (—Cl), a bromo group (—Br), or an iodo group (—I), and h represents an integer from 1 to 6.