Lithium Battery Electrolyte Reducing Initial Resistance
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Solution Overview
Problem
Lithium secondary batteries using non-aqueous electrolytic solutions with specific organosilicon compounds often exhibit limited reduction in initial battery resistance, as the generated fluorinated organosilicon compounds impair battery performance.
Innovation Solution
A non-aqueous electrolytic solution comprising an organosilicon compound with a metal, phosphorus, or boron atom, and a fluorine-containing alkali metal salt, where the content of fluorinated organosilicon compounds is limited to 0.2% by mass or less, is used to reduce initial battery resistance, along with a method for producing lithium secondary batteries incorporating this solution and a mixed-type non-aqueous electrolytic solution for controlled reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organosilicon compound is added to reduce initial battery resistance, then battery resistance decreases, but fluorinated organosilicon compounds are generated which impair battery performance
Solution Approach 1:
The patent extracts and removes the harmful fluorinated organosilicon compounds from the electrolytic solution through purification processes, specifically distillation methods that separate these compounds from the useful organosilicon compound and electrolyte components
Solution Approach 2:
The patent changes the concentration parameters by controlling the organosilicon compound content within specific ranges (0.01-5% by mass) and maintaining fluorinated compound levels below 0.2% by mass, optimizing the balance between resistance reduction and performance preservation
2Duration of action of stationary object
If the content of fluorinated organosilicon compounds is controlled to maintain battery performance, then battery life and efficiency are enhanced, but the complexity of electrolytic solution preparation increases
Solution Approach 1:
The patent applies preliminary purification actions during electrolytic solution preparation, incorporating distillation steps before battery assembly to prevent fluorinated compound accumulation that would otherwise occur during battery operation
Solution Approach 2:
The patent uses distillation as an intermediary purification process that separates harmful fluorinated compounds from the electrolytic solution, allowing the useful components to pass through while removing the harmful byproducts
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 approach effectively reduces the initial resistance of lithium secondary batteries while maintaining battery performance by controlling the content of fluorinated organosilicon compounds, thereby enhancing battery life and charging/discharging efficiency.
Implementation Method 1
the content of a fluorinated organosilicon compound generated by reaction of the organosilicon compound and the fluorine-containing alkali metal salt
Data Source
Figure 1
AI summary
The present invention provides a non-aqueous electrolytic solution including an organosilicon compound having a metal atom, a phosphorus atom or a boron atom, and a fluorine-containing alkali metal salt, wherein the content of a fluorinated organosilicon compound generated by reaction of the organosilicon compound and the fluorine-containing alkali metal salt in the non-aqueous electrolytic solution is 0.2% by mass or less.