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Di(methylsulfonyl) Ethane: New Electrolyte Additive for Enhancing LiCoO2/Electrolyte Interface Stability under High
ACS Applied Materials & Interfaces
|September 7, 2019
Summary
Di(methylsulfonyl) ethane (DMSE) enhances lithium cobalt oxide (LiCoO2) battery performance by forming a protective layer. This electrolyte additive improves high-voltage stability and capacity retention in LiCoO2/graphite cells.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- High-voltage performance of lithium cobalt oxide (LiCoO2) is crucial for advanced energy storage.
- Interfacial instability between LiCoO2 and electrolytes limits battery cycle life.
- Novel electrolyte additives are needed to enhance electrochemical stability.
Purpose of the Study:
- To investigate di(methylsulfonyl) ethane (DMSE) as an S-related electrolyte additive.
- To improve the interfacial stability of LiCoO2 at high voltages (3.0-4.5 V).
- To enhance the cycling performance and capacity retention of LiCoO2/graphite cells.
Main Methods:
- Electrochemical testing of LiCoO2/graphite cells with DMSE additive.
- Density Functional Theory (DFT) calculations to assess molecular orbital energies.
- Electrochemical impedance spectroscopy (EIS) for interfacial impedance analysis.
- Surface characterization using FTIR, XRD, SEM, TEM, and XPS.
Main Results:
- DMSE addition significantly improved high-voltage performance and capacity retention (20.8% to 66.5% after 100 cycles).
- DFT calculations showed DMSE has higher HOMO energy than common carbonate solvents.
- DMSE preferentially decomposes, forming a thinner protective film on LiCoO2.
- The protective film reduced interfacial impedance and suppressed electrolyte decomposition.
Conclusions:
- DMSE is an effective electrolyte additive for enhancing LiCoO2 stability and performance.
- The protective film formed by DMSE is key to improved cycling and high-voltage operation.
- DMSE offers a promising strategy for developing next-generation high-performance lithium-ion batteries.
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