Multivalent Battery Electrolyte Additives for Film Suppression
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Solution Overview
Problem
Multivalent metal secondary batteries face challenges in charge and discharge efficiency and stability due to film formation on the electrode surface caused by side reactions between the multivalent metal and the electrolyte, leading to insufficient capacity and reliability.
Innovation Solution
Incorporating a compound with an N—Si-based or O—Si-based bond as an additive in the electrolyte, which suppresses film formation and enhances charge and discharge efficiency by preventing side reactions and removing moisture, thereby improving the performance of multivalent metal secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte compositions are used for multivalent metal secondary batteries, then the battery can operate with multivalent metal cations, but film formation on the electrode surface occurs due to side reactions, leading to suppressed electrochemical deposition/dissolution reactions and insufficient charge and discharge efficiency
Solution Approach 1:
The patent introduces a specific additive compound as an intermediary substance in the electrolyte that mediates between the multivalent metal cations and the electrode surface. This additive prevents direct harmful interactions that cause film formation, allowing the battery to operate efficiently without the harmful side effects of conventional electrolytes.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by incorporating a specific additive compound with particular molecular structure and properties. This parameter change transforms the electrolyte's interaction with the electrode surface, preventing film formation while maintaining ion conductivity and enabling efficient electrochemical reactions.
2Quantity of substance
If multivalent metals such as magnesium, calcium, aluminum, or yttrium are used as negative electrode materials to increase energy density and capacity, then the battery can store more energy, but the multivalent metal cations are difficult to disperse into most lithium electrolyte compositions, and organic solvents form high-resistance films on the metal surface
Solution Approach 1:
The patent modifies the electrolyte's chemical parameters by adding a specific compound that changes the solvation environment for multivalent metal cations. This parameter change enables better dispersion and mobility of multivalent ions while preventing the formation of high-resistance films, thus maintaining both high energy density and efficient electrochemical reactions.
Solution Approach 2:
The patent creates a composite electrolyte system by combining conventional electrolyte components with a specifically designed additive compound. This composite electrolyte leverages the advantages of both the base electrolyte (ion conductivity) and the additive (film prevention and improved metal cation dispersion), enabling multivalent metal batteries to achieve both high capacity and reliable electrochemical performance.
3Reliability
If sulfone-based solvents are used in the electrolyte to improve battery properties, then the electrolyte can provide stable performance, but the electrolyte exhibits high viscosity and low ion conductivity at room temperature due to high boiling point, causing deterioration during battery operation
Solution Approach 1:
The patent merges the advantages of sulfone-based solvents (stability) with other electrolyte components and a specific additive compound. This combination creates a balanced electrolyte system that maintains the stability benefits of sulfone solvents while mitigating their drawbacks of high viscosity and low ion conductivity through synergistic interactions with the additive.
Solution Approach 2:
The patent adjusts the physical and chemical parameters of the electrolyte by incorporating the additive compound, which modifies the viscosity and ion conductivity characteristics. This parameter change allows the electrolyte to maintain stability while improving ion transport efficiency, preventing deterioration during battery operation.
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 use of N—Si-based or O—Si-based additives in the electrolyte significantly enhances the charge and discharge efficiency and stability of multivalent metal secondary batteries by preventing film formation on the electrode surface, leading to improved battery performance and extended lifetime.
Implementation Method 1
when including a compound including a specific chemical bond as an additive in an electrolyte liquid for a secondary battery, charge and discharge efficiency and lifetime of a secondary battery operated by a multivalent metal cation are enhanced by suppressing a film formation caused by side reactions between the multivalent metal and the electrolyte
Implementation Method 2
In addition, the additive for a secondary battery operates to remove moisture in an electrolyte
Data Source
AI summary
Disclosed is an electrolyte for a secondary battery, and a secondary battery comprising the same, and in particular, to an electrolyte for a secondary battery including an electrolyte salt, an organic solvent and an additive, wherein the additive includes at least one compound selected from the group consisting of a compound having an N—Si-based bond and a compound having an O—Si-based bond.