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Updated: Jul 1, 2025
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Solvation-Tailored PVDF-Based Solid-State Electrolyte for High-Voltage Lithium Metal Batteries.
Wujie Yang1, Yiwen Liu1, Xinyi Sun1
1Department Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
Zeolite molecular sieves were added to poly(vinylidene fluoride) polymer electrolytes to trap residual solvents. This strategy enhances the stability of solid-state lithium metal batteries, improving cycle life and suppressing side reactions.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Poly(vinylidene fluoride) (PVDF)-based polymer electrolytes are crucial for high-voltage solid-state lithium metal batteries due to their conductivity, mechanical strength, and thermal stability.
- Residual solvents like N,N-dimethylformamide (DMF) in PVDF electrolytes negatively impact long-term cycling stability by participating in detrimental solvation processes.
Purpose of the Study:
- To develop a solvation-tailoring strategy to mitigate the negative effects of residual solvents in PVDF-based solid-state electrolytes.
- To improve the cycling stability and safety of high-voltage solid-state lithium metal batteries.
Main Methods:
- Incorporation of 3 Å zeolite molecular sieves as fillers into PVDF polymer electrolytes.
- Investigating the interaction between DMF and zeolite molecular sieves to alter Li+ solvation structure.
- Evaluating the electrochemical performance of modified electrolytes in Li||Li symmetrical cells and Li||NCM811 full cells.
Main Results:
- Zeolite molecular sieves effectively confined residual DMF molecules, weakening their participation in Li+ solvation and promoting anion involvement.
- The tailored anion-rich solvation environment suppressed interfacial side reactions at the lithium anode and NCM811 cathode.
- Li||Li symmetrical cells exhibited ultra-stable cycling over 5100 hours at 0.1 mA cm⁻², and Li||NCM811 full cells achieved excellent cycling stability over 1130 and 250 cycles at 4.3 V and 4.5 V, respectively.
Conclusions:
- The solvation-tailoring strategy using zeolite molecular sieves is an effective approach to address residual solvent issues in PVDF-based solid-state electrolytes.
- Modulating solvation structures is critical for enhancing the performance and long-term stability of solid-state polymer electrolytes for advanced battery applications.
