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Saccharin Sodium Coupling Fluorinated Solvent Enabled Stable Interface for High-Voltage Li-Metal Batteries
Fujie Yang1,2, Pipi Wang3, Qizhang Huang1
1College Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, 510275, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|March 10, 2024
Summary
Saccharin sodium additive optimizes high-voltage lithium-metal batteries by creating stable interfaces on both the anode and cathode, enhancing cycling performance and capacity retention.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- High-voltage lithium-metal batteries (LMBs) require optimized electrode/electrolyte interfaces for stable operation.
- Controlling interface structures is crucial for preventing dendrite growth and material degradation.
Purpose of the Study:
- To develop a functional electrolyte additive for synergistic interface regulation in high-voltage LMBs.
- To investigate the impact of saccharin sodium (NaSH) on solid electrolyte interface (SEI) and cathode-electrolyte interface (CEI) layers.
Main Methods:
- Utilized ex-situ techniques and in-situ electrochemical dissipative quartz crystal microbalance (EQCM-D) for interface analysis.
- Employed theoretical calculations to understand ion transport kinetics.
- Fabricated and tested LiCoO2ǁLi full cells with the functional electrolyte.
Main Results:
- NaSH additive formed a robust SEI on the Li-metal anode, inhibiting lithium dendrites and improving anode stability.
- NaSH-induced CEI protected LiCoO2 cathode materials from structural damage during high-voltage cycling.
- Addition of NaSH improved Li+ desolvation and transport kinetics at the electrode/electrolyte interface.
Conclusions:
- Saccharin sodium (NaSH) is an effective multifunctional additive for constructing stable electrode/electrolyte interfaces in high-voltage LMBs.
- The NaSH-modified electrolyte significantly enhances the electrochemical performance and cycling stability of LiCoO2ǁLi full cells.
