Non-Aqueous Electrolyte Composition for Low-Resistance Li-Ion Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrolyte solutions for batteries, particularly lithium ion batteries, suffer from high resistance, especially at low temperatures, and stability issues due to the use of specific fluorine-containing sulfonylimide lithium salts, which can lead to pH decrease and solvent decomposition over time.
Innovation Solution
Combining a sulfonylimide compound represented by the general formula LiN(X1SO2)(X2SO2) with an amidosulfuric acid component to form an electrolyte composition that includes a specific fluorine-containing sulfonylimide lithium salt and an amidosulfuric acid component, along with a non-aqueous solvent, to reduce resistance and improve stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-containing sulfonylimide lithium salt is used as electrolyte, then battery resistance is reduced, but pH decreases and solvent decomposition occurs over time
Solution Approach 1:
The patent introduces an amidosulfuric acid component as an intermediary substance that mediates between the fluorine-containing sulfonylimide lithium salt and the solvent. This intermediary prevents direct harmful interactions while maintaining the beneficial low-resistance properties, thereby resolving the contradiction between improved electrical performance and chemical stability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorine-containing sulfonylimide lithium salt with amidosulfuric acid component. This composite approach allows the system to simultaneously exhibit the low resistance characteristics of the sulfonylimide salt and the stability provided by the amidosulfuric acid component, resolving the contradiction through material composition.
2Productivity
If fluorine-containing sulfonylimide lithium salt is used, then charge and discharge characteristics are improved, but storage stability deteriorates
Solution Approach 1:
The amidosulfuric acid component serves as a protective intermediary during storage conditions, preventing degradation reactions while not interfering with the charge-discharge performance. This allows the electrolyte to maintain both high productivity during operation and stability during storage.
Solution Approach 2:
The patent modifies the chemical environment parameters by introducing amidosulfuric acid, which changes the pH and chemical composition parameters to values that simultaneously support fast charge-discharge rates and long-term storage stability, resolving the contradiction through parameter optimization.
3Ease of manufacture
If conventional electrolyte composition is used, then manufacturing is simple, but resistance is high especially at low temperatures
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating fluorine-containing sulfonylimide lithium salt and amidosulfuric acid component, which fundamentally alters the electrical properties to achieve low resistance at low temperatures while maintaining manufacturing feasibility through straightforward mixing processes.
Solution Approach 2:
The patent creates a composite electrolyte formulation that combines multiple components with complementary properties. This composite approach achieves superior low-temperature performance while keeping the manufacturing process relatively simple, as it involves mixing predetermined ratios of stable chemical components.
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 combination significantly reduces resistance in batteries, enhances charge and discharge characteristics, and improves stability, including storage stability, even at low temperatures, while minimizing corrosion and solvent decomposition.
Implementation Method 1
combining an amidosulfuric acid component as a specific component with a specific fluorine-containing sulfonylimide lithium salt as an electrolyte salt can unexpectedly, for example, reduce the resistance (e.g., resistance derived from a positive electrode) in a battery
Implementation Method 2
the present invention can provide a composition and the like that improve or reduce problems specific to the use of the specific fluorine-containing sulfonylimide lithium salt, such as a decrease in the pH over time and decomposition of the solvent
Data Source
AI summary
An electrolyte composition includes: a sulfonylimide compound represented by the following general formula (1) as an electrolyte salt; and an amidosulfuric acid component.LiN(X1SO2)(X2SO2) (1)(where X1 and X2 are identical to or different from each other, and each represent a fluorine atom, an alkyl group with a carbon number of 1 to 6, or a fluoroalkyl group with a carbon number of 1 to 6).