Sulfonate Ester Electrolyte for High-Temperature Lithium Battery Stability
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Solution Overview
Problem
Lithium batteries face challenges with the stability of the solid electrolyte interface (SEI) layer and protection layer formed by general organic electrolyte solutions, which degrade at high temperatures, affecting battery lifespan and high-temperature characteristics.
Innovation Solution
An organic electrolyte solution incorporating a sulfonate ester-based compound with a cyclic sulfone group is used, which forms a durable SEI layer on the anode and protection layer on the cathode, enhancing stability and preventing direct contact between the organic solvent and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general organic electrolyte solutions are used, then the battery can operate, but the SEI layer and protection layer degrade at high temperatures, reducing battery lifespan and high-temperature characteristics
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing a sulfonate ester-based compound with specific molecular structure (Formula 1), where R1 and R2 represent various hydrocarbon groups. This compositional parameter change enables the formation of thermally stable SEI and protection layers that resist degradation at high temperatures, thereby improving both reliability and lifespan simultaneously
Solution Approach 2:
The electrolyte solution employs a composite formulation combining the sulfonate ester-based compound (Formula 1) with conventional electrolyte components. This composite material approach creates synergistic effects where the sulfonate ester compound forms stable interfacial layers that protect the electrodes, while the overall electrolyte maintains its ionic conductivity, thus resolving the contradiction between layer stability and battery performance
2Reliability
If the SEI layer and protection layer are formed by general organic electrolyte solutions, then the layers provide initial protection, but they degrade at high temperatures, allowing solvent intrusion into electrodes
Solution Approach 1:
By changing the chemical parameters of the electrolyte composition to include the sulfonate ester-based compound with specific structural features (Formula 1), the patent modifies the properties of the formed SEI and protection layers. These layers exhibit enhanced thermal stability and resistance to solvent intrusion, preventing the harmful effects that occur with conventional electrolyte-derived layers at elevated temperatures
3Productivity
If conventional electrolyte compositions are used, then the battery shows basic performance, but discharge capacity and high-temperature stability are insufficient
Solution Approach 1:
The patent optimizes the electrolyte composition by incorporating the sulfonate ester-based compound (Formula 1) at specific concentrations, where the molecular structure parameters (R1 and R2 groups) are carefully selected. This parameter optimization enables the formation of stable interfacial layers that maintain their integrity at high temperatures, thereby preserving discharge capacity and improving high-temperature stability simultaneously
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 sulfonate ester-based compound improves high-temperature stability and lifespan characteristics of lithium batteries by forming stable layers that maintain durability during charging and discharging processes, increasing discharge capacity and preventing solvent intrusion.
Implementation Method 1
the sulfonate ester-based compound may easily accept electrons from an anode compared to the polar solvent. Thus, the sulfonate ester-based compound may be reduced at a voltage lower than that at which the polar solvent reduces, and thus the sulfonate ester-based compound may be reduced before the polar solvent reduces
Implementation Method 2
the sulfonate ester-based compound has a structure in which a cyclic sulfone group linked to a sulfonate group. Without being bound by theory, it is believed that the cyclic sulfone group included in the sulfonate ester-based compound may accept electrons from an anode surface during a charging process and reduce itself
Implementation Method 3
the sulfonate ester-based compound may form a protection layer on a cathode, thereby preventing direct contact between the organic solvent and the cathode
Data Source
AI summary
Provided is an organic electrolyte solution that includes a lithium salt, an organic solvent, and a sulfonate ester-based compound represented by Formula 1:R2—O—S(═O)2—R1 <Formula 1>wherein, in Formula 1, R1 may be a C1-C20 alkyl group that is unsubstituted or substituted with halogen, a C5-C20 cycloalkyl group that is unsubstituted or substituted with halogen, a C6-C40 aryl group that is unsubstituted or substituted with halogen, or a C2-C40 heteroaryl group that is unsubstituted or substituted with halogen, and R2 may be a substituted or unsubstituted cyclic sulfone group.