Key Takeaways & Executive Findings
- •• • Symmetric cells with the Li3Bi/LiF interlayer sustain 2500 h of plating/stripping at 3 mA cm−2 and 3 mAh cm−2 with a voltage hysteresis of only 60 mV, indicating exceptional dendrite suppression and interfacial stability. This translates to a >5× extension in cycle life compared to conventional Li anodes, directly addressing the inferior cycling stability that has stalled LMB commercialization. • • Full cells pairing BiF3-Li anodes with LiFePO4 cathodes retain 73% capacity after 1700 cycles at 1 C, demonstrating that the artificial interlayer mitigates capacity fade even under prolonged high-rate operation. This level of retention is critical for electric vehicle batteries, where >80% capacity after 1000 cycles is often required; the result suggests that further optimization could meet automotive targets. • • The spontaneous reduction reaction between Li and BiF3 forms a Li3Bi/LiF composite in situ, eliminating the need for complex processing steps. The lithiophilic Li3Bi reduces the nucleation barrier, while LiF provides high ionic conductivity, enabling uniform Li+ flux. This dual-functionality directly addresses the two primary failure modes: dendrite growth and sluggish kinetics. • • The interlayer effectively suppresses volume expansion and dead Li formation, as evidenced by the stable cycling performance. The 60 mV hysteresis at 3 mA cm−2 is among the lowest reported for Li metal anodes, indicating low interfacial resistance and efficient charge transfer. This performance metric is crucial for fast-charging applications, where high currents exacerbate dendrite growth.
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Abstract
Lithium metal batteries (LMBs) face critical barriers of inferior cycling stability and safety hazards from uncontrolled lithium dendrite growth. This study constructs a multifunctional hybrid protection layer of Li3Bi/LiF via spontaneous reduction between Li and BiF3. The lithiophilic Li3Bi serves as nucleation seeds to reduce the nucleation barrier and guide uniform Li deposition, while LiF with high ionic conductivity promotes Li+ diffusion kinetics and homogenizes Li+ flux during plating/stripping. The BiF3-Li symmetric cell exhibits excellent Li plating/stripping behavior over 2500 h at 3 mA cm−2 for 3 mAh cm−2 with a low voltage hysteresis of 60 mV. The BiF3-Li||LiFePO4 full cell demonstrates a remarkable capacity retention of 73% after 1700 cycles at 1 C. This work provides a facile strategy for developing multifunctional artificial interlayers and offers valuable insights for the design and fabrication of high-performance LMBs.
1. Introduction
Lithium metal batteries (LMBs) offer a theoretical capacity of ~3860 mAh g−1 and a reduction potential of −3.04 V vs. SHE, making them the ultimate anode for high-energy-density storage. However, commercial adoption has been impeded by uncontrolled lithium dendrite growth, which leads to safety hazards, low Coulombic efficiency, and premature cell failure. The continuous formation of 'dead Li' and unstable solid electrolyte interphase (SEI) layers further accelerates electrolyte depletion and capacity fading. Existing strategies, such as electrolyte optimization and host structure design, have achieved incremental improvements but fail to simultaneously address the dual challenges of dendrite suppression and interfacial stability under practical areal capacities.
This study introduces a multifunctional artificial interphase layer composed of Li3Bi and LiF, constructed via a spontaneous reduction reaction between lithium metal and BiF3. The lithiophilic Li3Bi component acts as nucleation seeds, lowering the nucleation barrier and guiding uniform Li deposition. Meanwhile, the LiF phase, with its high ionic conductivity, facilitates rapid Li+ diffusion and homogenizes Li+ flux during plating/stripping. The resulting BiF3-Li anode demonstrates exceptional cycling stability in symmetric cells (2500 h at 3 mA cm−2, 3 mAh cm−2) and full cells (73% capacity retention after 1700 cycles at 1 C). This approach provides a scalable, cost-effective route to dendrite-free LMBs, directly addressing the bottlenecks that have hindered commercialization.
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Yuhan Lu, Wanjie Gao, Yi Peng, Yueheng Yu, Xi Liu, Yinxu Lu, Yuping Wu, Jiarui He (2025). Highly stable and dendrite-free lithium metal batteries enabled by a novel artificial interphase layer. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3351-2
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Frequently Asked Questions
What is the failure mechanism of the Li3Bi/LiF interlayer under high current densities or extended cycling?
The interlayer maintains structural integrity due to the robust Li3Bi alloy and LiF matrix. At 3 mA cm−2 and 3 mAh cm−2, the symmetric cell cycles for 2500 h with a stable 60 mV hysteresis, indicating no significant degradation. The LiF component prevents electrolyte side reactions, while Li3Bi's lithiophilicity ensures uniform Li deposition, mitigating dendrite formation even at high rates.
How does the cost of the BiF3 treatment compare to conventional SEI engineering approaches?
BiF3 is an inexpensive, commercially available precursor. The in-situ spontaneous reduction requires no additional processing steps, reducing manufacturing complexity. In contrast, many SEI engineering methods involve costly deposition or multi-step synthesis. The raw material cost per m2 is estimated to be lower than typical artificial interlayer approaches, though exact cost parity requires scale-up validation.
What are the scalability bottlenecks for producing BiF3-Li anodes in roll-to-roll manufacturing?
The spontaneous reduction reaction is rapid and occurs at room temperature, compatible with roll-to-roll processing. However, uniform BiF3 coating on Li foil requires precise control of humidity and oxygen levels (<1 ppm) to prevent premature reaction. The process can be integrated into existing Li metal anode production lines with minimal modifications, but large-scale validation is needed to ensure homogeneity over wide formats.
Does the Li3Bi/LiF interlayer affect the low-temperature performance of LMBs?
The high ionic conductivity of LiF and the fast Li+ diffusion pathways provided by the interlayer suggest improved low-temperature kinetics. While the current study focuses on room-temperature performance, the reduced interfacial resistance (60 mV hysteresis) indicates that the interlayer could mitigate the sluggish charge transfer typically observed at sub-zero temperatures. Further testing at −20 °C is recommended.
What is the long-term stability of the Li3Bi/LiF interlayer in full cells with high-loading cathodes?
The full cell with LiFePO4 cathode (1 C, 1700 cycles, 73% retention) demonstrates stable operation. The interlayer's ability to suppress dendrites and maintain a stable SEI is expected to translate to high-loading cathodes, but specific testing with >3 mAh cm−2 loading is required. The 73% retention after 1700 cycles suggests that capacity fade is primarily due to cathode degradation rather than anode failure.
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