Research Digest — 2026-05-01¶
Interface Stability & Dendrite Mechanics¶
1. Interfacial Breathing as a Dynamic Failure Law in All-Solid-State Batteries¶
Source: arXiv:2604.24075 () · 📅 2026-04-27 · ↗ Open paper
Introduces the concept of "interfacial breathing" — cycle-scale oscillation of lithium contact at the electrode–electrolyte interface — as a governing degradation mechanism in all-solid-state batteries. The authors show degradation is governed by two coupled processes: breathing (reversible contact oscillation) and reactive memory (irreversible electrolyte decomposition accumulation). A phase-field model of a sulfide-based cell demonstrates that higher stack pressure suppresses breathing but leaves reactive memory unchanged, producing a regime map with void-growth-dominant, healing-dominant, and interphase-memory-dominant regions. The work also predicts energy-density rank inversion with C rate.
Relevance to DENG.Group
Directly relevant to Shoutong Jin's phase-field dendrite modeling. The breathing/memory framework provides a new physical basis for constructing coupled electrochemical-mechanical phase-field models. The finding that pressure controls breathing but not memory has direct implications for cell design and operating conditions. The regime map concept could be adopted for the group's own modeling of dendrite suppression strategies.
2. Mechanically Driven Li Dendrite Penetration in Garnet Solid Electrolyte¶
Source: Nature (s41586-026-10415-9) · 📅 2026-04-22 · ↗ Open paper
Using cryogenic electron microscopy and micromechanical fracture modelling, this study resolves the long-standing debate on the "soft-penetrates-hard" phenomenon in LLZTO garnet electrolytes. Both intergranular and transgranular fracture events are observed, with lithium fully filling nanoscale cracks at the dendrite tip. No isolated lithium nuclei are detected ahead of the dendrite tip, ruling out the electron-leakage nucleation mechanism. Crystal lattice rotations near the Li/LLZTO interface indicate a nearly hydrostatic stress state within the dendrite, supporting a mechanically driven fracture propagation model. The authors propose a mechanics-informed strategy using geometrically engineered voids in LLZTO to redirect dendrite propagation.
Relevance to DENG.Group
A landmark paper for Shoutong Jin's phase-field work. The definitive cryo-EM evidence that dendrite penetration is mechanically driven (not electron-leakage nucleation) provides critical validation targets for phase-field models. The proposed void-engineering strategy for redirecting dendrites is a novel design concept that could be explored computationally. This complements the Chiang group's electrochemical corrosion paper from the April 19 digest.
Halide Solid Electrolytes¶
3. Unraveling the Foreign-Cation Effect in UCl₃-Type Halide Solid Electrolytes for Low-Temperature All-Solid-State Batteries¶
Source: Nature Communications (s41467-026-70621-x) · 📅 2026-04 · ↗ Open paper
Investigates the role of foreign cations in UCl₃-type halide solid electrolytes, demonstrating that amorphous phase engineering dramatically enhances ionic conductivity and electrochemical performance. The study reveals that the critical role of amorphous phases in halide electrolytes has been underappreciated, and that UCl₃-type systems are promising for low-temperature all-solid-state batteries. The work provides systematic structure–property relationships across a range of cation substitutions.
Relevance to DENG.Group
Highly relevant to Yan Li and Mengke Li's halide electrolyte research. The UCl₃-type structure represents a relatively underexplored halide framework compared to Li₃YCl₆-type systems. The amorphous phase engineering strategy complements the group's computational approaches and could inform compositional screening. Low-temperature operation is increasingly important for practical SSB deployment.
4. High-Entropy Tailored UCl₃-Type Halide Electrolytes for Solid-State Sodium-Ion Batteries¶
Source: Angewandte Chemie (10.1002/anie.3315764) · 📅 2026-04 · ↗ Open paper
Extends the high-entropy concept to UCl₃-type halide electrolytes for sodium-ion solid-state batteries. High-entropy compositional disorder is used to stabilize the UCl₃ structure while optimizing the Na⁺ transport pathway. The resulting high-entropy halide serves as a stable cathode–solid electrolyte composite for high-voltage, long-cycle-life solid-state sodium-ion batteries, demonstrating 4 V-class performance.
Relevance to DENG.Group
Relevant to the group's interest in both halide electrolytes and Na-ion systems. The convergence of high-entropy design with UCl₃-type halides for Na⁺ conduction is a novel direction that could be explored computationally. The 4 V-class performance in Na systems is notable and suggests these materials deserve systematic screening.
5. From Powder to Product: A Perspective on Halide Electrolytes for Commercial Lithium Solid-State Batteries¶
Source: Tungsten (Springer, 10.1007/s42864-026-00378-9) · 📅 2026-05 · ↗ Open paper
A comprehensive perspective examining halide solid electrolytes through the lens of commercialization readiness. Covers structure–property relationships across trigonal, spinel, and emerging oxyhalide frameworks, with emphasis on aliovalent doping, mixed-anion strategies, and Earth-abundant chemistries. Evaluates scalable synthesis pathways (mechanochemical milling, melt processing) and their trade-offs in cost and phase purity. Discusses integration strategies for composite electrodes and full-cell architectures with manufacturability and performance metrics. Provides a roadmap for halide-based SSB development.
Relevance to DENG.Group
Valuable reference for the entire group working on halide electrolytes. The commercialization perspective — from synthesis scalability to cell integration — complements the group's fundamental computational work. The roadmap and comparative analysis with sulfide/oxide systems are useful for positioning future research proposals and identifying high-impact directions.
ML Interatomic Potentials¶
6. Experimental Validation of Universal Machine Learning Interatomic Potentials for Lithium-Ion Dynamics in Solid Electrolytes via ⁷Li NMR¶
Source: ChemRxiv (10.26434/chemrxiv.15002480) · 📅 2026-04-29 · ↗ Open paper
Provides the first systematic experimental validation of universal machine learning interatomic potentials (MLIPs) against ⁷Li NMR spectroscopy measurements for lithium-ion dynamics in solid electrolytes. The work tests whether state-of-the-art universal MLIPs can accurately predict Li hop rates, activation energies, and diffusion pathways that match experimental NMR observables across multiple solid electrolyte systems. The results benchmark the reliability of universal potentials for transport property predictions.
Relevance to DENG.Group
Directly relevant to Yanhao Deng's MLIP research. Experimental validation of MLIP predictions against NMR is the gold standard for assessing potential accuracy. This paper provides a critical benchmark for how well universal (non-system-specific) potentials perform for Li transport — directly informing the group's choice of training strategies and potential architectures. If universal potentials are validated, it could significantly reduce the computational cost of the group's screening workflows.
Self-Discharge & Electronic Conductivity¶
7. Quantifying the Self-Discharge Rate of Solid-State Batteries¶
Source: Nature Energy (s41560-026-02038-1) · 📅 2026-04-22 · ↗ Open paper
Presents a rigorous methodology for quantifying internal self-discharge (ISD) in solid-state batteries arising from parasitic electronic conductivity through the solid electrolyte separator. Demonstrates that electronic partial conductivity must be sufficiently suppressed for SSBs to compete with the <2%/month self-discharge rates of conventional LIBs. The work distinguishes ISD from irreversible degradation and provides a framework for benchmarking different solid electrolyte families. Discusses how grain boundaries and interfaces contribute to electronic leakage.
Relevance to DENG.Group
Relevant to the group's interface stability work and provides an important practical metric for evaluating solid electrolyte candidates. The electronic conductivity aspect is often overlooked in computational screening but is critical for commercial viability. The grain boundary contribution to electronic leakage connects to the group's interest in grain boundary effects on ionic conductivity.