Cyclic Sulfone Electrolyte Additive for High-Temperature Capacity Retention
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Solution Overview
Problem
There is a demand for improving the high-temperature characteristics of power storage devices, specifically to maintain high capacity and minimize gas generation even in high-temperature environments.
Innovation Solution
The use of a cyclic sulfone compound represented by Formula (1) as an additive in non-aqueous electrolytic solutions, which forms a strong Solid Electrolyte Interphase (SEI) on the electrode surface, enhancing stability and reducing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional additives are used to form SEI coating, then battery capacity deterioration is minimized, but high-temperature characteristics and gas generation control are insufficient
Solution Approach 1:
The patent introduces a novel cyclic sulfone compound with specific molecular structure parameters (Formula 1 with R1, R2, R3, R4 being specific groups) that changes the properties of the SEI coating formed on electrodes. This parameter change in the additive structure leads to improved high-temperature stability and reduced gas generation while maintaining capacity retention
Solution Approach 2:
The patent combines the cyclic sulfone compound with specific non-aqueous solvents (cyclic carbonates, chain carbonates, cyclic carboxylic acid esters) to create a composite electrolyte system. This composite approach synergistically improves both the SEI coating quality and high-temperature characteristics, addressing both capacity retention and gas generation control
2Productivity
If existing electrolyte formulations are used, then basic battery function is maintained, but capacity and gas generation are not controlled under high-temperature conditions
Solution Approach 1:
The cyclic sulfone compound performs preliminary action by forming a stable SEI coating on the electrode surface during initial charging cycles. This pre-formed protective layer prevents subsequent solvent decomposition and gas generation even when the battery is exposed to high-temperature conditions during normal operation
Solution Approach 2:
The patent uses a small amount of the cyclic sulfone compound (0.01-5 wt% of electrolyte mass) that sacrificially decomposes during initial cycles to form the protective SEI layer. This disposable-like behavior of the additive protects the main electrolyte system from degradation at high temperatures
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
This approach effectively maintains high capacity and minimizes gas generation in power storage devices when exposed to high temperatures, while also improving stability and handling performance.
Implementation Method 1
the cyclic sulfone compound undergoes electrochemical reduction during initial charging and discharging, the terminal carbon-carbon unsaturated bonds are polymerized on the electrode, thereby multiplying to form a strong SEI
Implementation Method 2
the terminal carbon-carbon unsaturated bonds are polymerized on the electrode, thereby multiplying to form a strong SEI
Implementation Method 3
The SEI is considered to minimize the decomposition of solvent molecules on the electrode surface, thereby minimizing the consumption of electricity associated with the decomposition of solvent molecules
Data Source
Figure 1
AI summary
An additive for a non-aqueous electrolytic solution includes a cyclic sulfone compound represented by Formula (1). X1 represents a sulfonyl group or carbonyl group and Z represents a monovalent group represented by Formula (21), (22), (23), or (24):