Sulfone Sulfonylimide Electrolytes for Battery Interface Stability
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Solution Overview
Problem
Conventional electrolyte formulations fail to stabilize highly reactive interfaces in advanced battery chemistries, particularly those operating at high potentials or experiencing dynamic phase changes, leading to irreversible losses and poor Coulombic efficiency.
Innovation Solution
An electrochemical cell utilizing an electrolyte solution comprising an aliphatic or cyclic sulfone and a metal perfluoroalkylsulfonylimide salt with a total molar mass greater than 200 g/mol, which forms protective interphasial layers on both anode and cathode surfaces, enhancing stability and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte formulations are used, then the battery can operate with basic stability, but the electrolyte fails to stabilize highly reactive interfaces in advanced battery chemistries operating at high potentials or experiencing dynamic phase changes, leading to irreversible losses and poor Coulombic efficiency
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte by introducing sulfone solvents (cyclic or aliphatic) combined with specific metal salts, replacing conventional electrolyte formulations. This parameter change enables the electrolyte to stabilize highly reactive interfaces in advanced battery chemistries operating at high potentials (>4.5V) or experiencing dynamic phase changes, thereby reducing irreversible losses and improving Coulombic efficiency
Solution Approach 2:
The patent creates a composite electrolyte system by combining sulfone solvents with metal salts to form a new electrolyte composition. This composite material approach allows the electrolyte to simultaneously provide stability at high potentials and suppress parasitic reactions, resolving the contradiction between interface stability and energy loss
2Reliability
If conventional electrolyte formulations are used, then the battery structure remains simple, but the electrolyte cannot form robust protective interphasial layers on both anode and cathode surfaces over a wide temperature range
Solution Approach 1:
The patent modifies the electrolyte composition parameters by using sulfone solvents with specific molecular structures and combining them with metal salts at optimized concentrations. This enables the formation of robust protective interphasial layers on both anode and cathode surfaces across a wide temperature range, while maintaining a relatively simple binary electrolyte system that does not significantly increase device complexity
3Productivity
If conventional electrolyte formulations are used, then the electrolyte composition is simple, but the electrolyte cannot provide sufficient conductivity and fast kinetics for advanced battery chemistries with high voltage or capacity demands
Solution Approach 1:
The patent optimizes the electrolyte parameters by selecting sulfone solvents with appropriate dielectric constants and combining them with metal salts at specific concentrations. This parameter optimization simultaneously achieves high ionic conductivity for fast battery kinetics and sufficient stability at high potentials (>4.5V), resolving the contradiction between productivity and reliability
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 significantly reduces irreversible losses, limits interphasial impedance growth, and enables high-efficiency, long-cycle life in challenging battery chemistries with high voltage or capacity demands.
Implementation Method 1
the passivation is realized by the initial decompositions of the solvent and salt in trace amount and the subsequent deposition of these decomposition products which deactivate the catalytic decomposition sites of the electrode surfaces
Implementation Method 2
non-aqueous electrolyte and its related aqueous hybrid electrolytes that improve the performance of advanced battery chemistries
Data Source
AI summary
Disclosed is an electrochemical cell, which may be used for advanced rechargeable batteries. The electrochemical cell comprises two or more electrodes within an electrolyte solution, where the electrolyte solution containing (i) an aliphatic or cyclic sulfone and (ii) a metal perfluoroalkylsulfonylimide salt.