Composite Electrolyte Salt for Wide-Temperature Battery Performance
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Solution Overview
Problem
Existing electrolyte solutions for lithium and sodium batteries struggle to simultaneously achieve good high-temperature and low-temperature performance, often requiring multiple additives that can interfere with each other's performance, and the development of new metal salts with both properties is needed.
Innovation Solution
The use of a pyrosulfate-boron trifluoride composite metal salt, such as LiBF4 or NaBF4, in the electrolyte solution, which improves both cycle and high-temperature storage performance while enhancing ionic conductivity and reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electrolyte solution additives are added to simultaneously improve high-temperature and low-temperature performance, then both high-temperature performance and low-temperature performance are improved, but the device complexity and additive interactions increase
Solution Approach 1:
The patent combines high-temperature additive functionality and low-temperature additive functionality into a single dual-functional additive compound. This merging approach eliminates the need for multiple separate additives, reducing composition complexity while maintaining both high-temperature and low-temperature performance improvements.
Solution Approach 2:
The patent develops a universal electrolyte solution additive that performs multiple functions simultaneously: it improves both high-temperature performance and low-temperature performance, and provides antioxidant protection. This single additive replaces what would traditionally require multiple different additives, simplifying the overall composition.
2Quantity of substance
If high-voltage electrolyte solutions are developed to improve volumetric energy density, then volumetric energy density is improved, but electrochemical properties degradation occurs
Solution Approach 1:
The patent applies preliminary protective action by introducing antioxidant functionality into the electrolyte solution additive before high-voltage operation causes degradation. The additive proactively prevents electrochemical property degradation by forming protective interfaces and scavenging radicals, allowing high-voltage operation to proceed without the harmful degradation effects.
Solution Approach 2:
The patent modifies the chemical structure and properties of the electrolyte solution additive to enable it to function effectively at high voltages. By changing the additive's molecular characteristics and reactivity parameters, it can stabilize the electrode interface and prevent degradation even under high-voltage conditions that would normally cause electrochemical property deterioration.
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 pyrosulfate-boron trifluoride composite metal salt enhances both high-temperature and low-temperature performance of batteries by forming a cross-linked interface membrane that improves Li+ or Na+ transfer, reducing inorganic salt content, and maintaining antioxidant performance.
Implementation Method 1
forming a cross-linked interface membrane that improves Li+ or Na+ transfer
Implementation Method 2
building a stable electrode/electrolyte solution interfacial membrane
Implementation Method 3
achieve the goal of electronic insulation and lithium-ion/sodium ion transmission
Data Source
AI summary
Use of a pyrosulfate-boron trifluoride composite metal salt in an electrolyte solution. The use of the pyrosulfate-boron trifluoride composite metal salt having at least one structure is added to an electrolyte solution at an addition amount of 0.1 wt % to 15.0 wt %. The pyrosulfate-boron trifluoride composite metal salt is obtained by means of the reaction of a pyrosulfate and boron trifluoride gas or a boron trifluoride complex. A pyrosulfate-boron trifluoride composite lithium salt is further applied to a lithium-ion secondary battery including a negative electrode containing an active material with a specific surface area of 0.1 m2/g to 20 m2/g.