High-entropy PVDF-based electrolyte

Ultra-long cycling solid-state lithium metal batteries

Synergistic regulation by TEGDME and LiNO3 simultaneously improves bulk ion transport kinetics and interfacial stability, enabling ultra-long cycling of room-temperature solid-state lithium metal batteries.

Kaibo, Fan · Jie, Chen · Biao, Wang · Kao, Cao · Chenyang, Zhang · Jun, Chen · Zhao, Yong · Yuan, Jiren · Hu, Zhengguang · Wang, Li

Nano Energy 2026

Specifications

Ionic conductivity

{'zh': '0.65', 'en': '0.65'} mS cm⁻¹

Critical current density

{'zh': '1.8', 'en': '1.8'} mA cm⁻²

Cycle life at 0.5 C

{'zh': '1200', 'en': '1200'} 次

Cycle life at 1 C

{'zh': '1000', 'en': '1000'} 次

Cycle life at 2 C

{'zh': '800', 'en': '800'} 次

Cycle life at 10 C

{'zh': '520', 'en': '520'} 次

Cycle life at −10 °C

{'zh': '800', 'en': '800'} 次

Advantages

DMF evicted

Strong nucleophilicity of TEGDME and NO3⁻ weakens Li⁺···DMF interactions, peeling 45.96% of DMF from the inner solvation sheath and reducing interfacial side reactions.

PVDF released

Same mechanism peels 46% of PVDF from the inner solvation sheath, reducing chain anchoring on Li⁺ and accelerating desolvation.

High-entropy disruption

Diverse solvation ligands increase chaos, disrupting the initial Li⁺ solvation dominated by DMF/PVDF and broadening the coordination environment.

Interphase upgraded

Li⁺ solvation governed by NO3⁻ and TEGDME exhibits high HOMO/LUMO levels, constructing an inorganic-rich bilayer interphase for improved stability.

Applications

• Solid-state lithium metal batteries：Replace liquid electrolyte, eliminating leakage and flammability while enabling Li metal anode.
• High-energy-density lithium batteries：Pair with Li metal anode to push energy density beyond 400 Wh kg⁻¹, surpassing commercial cells.
• Electrochemical energy storage devices：Provide safe and long-life solid-state battery core for grid storage and electric vehicles.
• Battery testing and characterization：Serve as benchmark with high conductivity and long cycle life for calibrating solid-state battery testing.