LiF-Organic Composite SEI

Ultra-stable Li anode

Organic-inorganic hybrid SEI significantly enhances interfacial stability of Li metal anode in SOCl2 electrolyte.

Liu, Zihui · Feng, Wenting · Jianhang, Yang · Xinru, Wei · Zhang, Yunbo · Chenyu, Ma · Yiming, Sun · Han, Wang · 80253750 · Kong, Debin · Mao, Changming

Advanced Functional Materials 2026

Specifications

Structural stability time

{'zh': '48', 'en': '48'} h

Cycle life

{'zh': '400', 'en': '400'} cycles

Advantages

24-fold longer corrosion resistance

The protective layer extends the structural stability of Li metal in corrosive electrolyte from under 2 hours to over 48 hours, enabling long-term anode operation in harsh environment.

Over 400 cycles

Li-Cl2 batteries with the protective layer can cycle over 400 times at 1000 mA g⁻¹, far exceeding unprotected counterparts.

Suppressed parasitic reactions

The protective layer isolates the Li anode from corrosive SOCl2 electrolyte, suppressing parasitic reactions and enhancing interfacial stability.

Ionic conduction with flexibility

The Li3Sb/LiF phase ensures high ionic conductivity and guides uniform Li deposition, while the flexible PVDF matrix accommodates volume changes during cycling, preventing cracking.

Applications

• Li metal batteries：Provides corrosion-resistant and stable Li metal anode, extending battery life.
• Solid-state batteries：The protective layer strategy can be applied to stabilize Li metal interfaces in solid-state batteries.
• Battery management：Improves anode tolerance in harsh electrolytes, simplifying battery management strategies.
• Electrochemical energy storage：Offers a feasible interfacial engineering approach for high-energy-density Li metal batteries.