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A Scalable BaTiO3 Nanocoating Strategy for Cost-Effective and Stable Sulfide-Based All-Solid-State Batteries
Wenjin Li1, Qingmei Xiao1, Shiming Huang1
1Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, College of Materials Science and Engineering, Shenzhen University, Shenzhen, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 5, 2026
Summary
A novel BaTiO3 nanocoating enhances sulfide solid-state batteries by improving air stability and reducing costs. This breakthrough enables long-lasting, high-performance batteries for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sulfide-based all-solid-state batteries (ASSBs) offer high energy density and safety but face challenges like cost, air instability, and cathode degradation.
- Nickel-rich cathodes are crucial for high energy density but are prone to side reactions with sulfide electrolytes.
Purpose of the Study:
- To develop a scalable and cost-effective nanocoating strategy for sulfide electrolytes to overcome their limitations.
- To improve the air stability, electrochemical performance, and cycling life of ASSBs.
Main Methods:
- A rapid 10-minute ball-milling process was used to apply a uniform ~100 nm BaTiO3 (BTO) nanocoating onto Li5.5PS4.5Cl1.5 (LPSC1.5) electrolytes.
- Experimental characterization and finite element analysis were employed to investigate the coating's effects.
- The coated electrolytes were paired with PCNCM83 cathodes to fabricate and test ASSBs.
Main Results:
- The BTO nanocoating reduced electrolyte cost by ~8.1% while maintaining high ionic conductivity (8.81 mS cm-1).
- The coating significantly improved air stability by suppressing H2S evolution and preserving conductivity.
- The modified electrolytes enabled ASSBs with exceptional rate capability and over 10,000 cycles at 7 C.
Conclusions:
- The BTO nanocoating strategy is a universal approach compatible with various sulfide electrolytes and cathode chemistries.
- This method offers a viable pathway for the scalable commercialization of high-performance solid-state batteries.
- The nanocoating homogenizes charge distribution, inhibits space-charge layers, and mitigates interfacial side reactions, enhancing battery robustness.
