Research Digest — 2026-05-11¶
Halide Solid Electrolytes¶
1. Strain-Dependent Ionic Transport in Li3YCl6 Solid Electrolytes¶
Source: arXiv:2605.05603 · 📅 2026-05-07 · ↗ Open paper
Uses an Atomic Cluster Expansion (ACE) machine learning interatomic potential trained on DFT data to study strain effects on Li+ transport in Li3YCl6 via large-scale molecular dynamics. The authors discover a two-regime Arrhenius behavior: 1D hopping at low temperature crossing over to 3D cooperative diffusion above a critical temperature Tc. Tensile strain enhances diffusivity while compressive strain suppresses it, but Tc remains invariant, indicating strain tunes diffusion efficiency without reshaping the underlying transport mechanism. In the low-T regime, strain modifies activation barriers; in the high-T regime, it alters pre-exponential factors.
Relevance to DENG.Group
Directly relevant to Mengke Li and Yan Li's halide electrolyte work. The ACE MLIP methodology for Li3YCl6 could be adopted by the group for computational screening. The finding that strain modifies transport without changing the mechanism has practical implications for pressed-pellet cell assembly. Relevant to Yanhao Deng's MLIP development as another demonstration of ACE potentials for halide systems.
2. Reduction Resistible Halide Solid Electrolytes Enabled by Orbital Gap Modulation¶
Source: Advanced Functional Materials (10.1002/adfm.202506144) · 📅 2026-01-29 · ↗ Open paper
Proposes a strategy to improve the reduction stability of Li-M-Cl halide electrolytes by incorporating lanthanide elements (Ho and Lu) at the metal sites, which increase the orbital gap of metal-centered polyhedra and thus resist reduction. As proof of concept, a series of new Li-Ho/Lu-Cl superionic conductors are synthesized that exhibit excellent compatibility with lithium metal anodes. All-solid-state batteries using these electrolytes as a single layer retain 80.1% capacity after 500 cycles at 1C.
Relevance to DENG.Group
Highly relevant to Mengke Li and Yan Li's halide electrolyte research. The orbital gap modulation concept provides a new design principle for computationally screening halide compositions with improved anode stability. The Ho/Lu-based chemistries are underexplored and could be interesting targets for DFT calculations of stability and conductivity.
3. Unveiling the High-Voltage Reactivity and Gas Evolution With Aluminum-Based Chloride and Oxychloride Catholytes in Solid-State Sodium Batteries¶
Source: Advanced Energy Materials (10.1002/aenm.71011) · 📅 2026-04-30 · ↗ Open paper
Investigates high-voltage interfacial reactions between NaAlCl4 and amorphous Na-Al-oxychloride (NACO) catholytes with NaNi0.5Mn0.5O2 layered oxide cathodes using operando electrochemical mass spectrometry (OEMS) and ToF-SIMS. Counterintuitively, crystalline NaAlCl4 shows better high-voltage cycling stability than the higher-conductivity NACO, because oxygen incorporation promotes O2 gas evolution at high voltage. ToF-SIMS reveals redox-driven Cl/O anion exchange between cathode and electrolyte, with Cl-deficient NACO causing heterogeneous phase separation in the cathode.
Relevance to DENG.Group
Relevant to the group's interest in halide electrolytes, particularly for sodium systems. The finding that oxygen incorporation — while beneficial for conductivity — can compromise high-voltage stability is an important design consideration. The OEMS methodology and the redox-driven anion exchange mechanism provide new characterization approaches the group could apply to their own halide electrolyte studies.
ML Interatomic Potentials¶
4. Polarizable Atomic Multipoles for Learning Long-Range Electrostatics¶
Source: arXiv:2605.05746 · 📅 2026-05-07 · ↗ Open paper
Introduces a semi-local framework for learning electrostatics from energies and forces using polarizable atomic multipoles (monopoles, dipoles, quadrupoles) predicted by local equivariant descriptors. Residual non-local charge transfer and polarization are captured by non-self-consistent linear response in induced charges and dipoles. Across four benchmarks and four short-range MLIP architectures, the multipole hierarchy systematically improves accuracy, especially for systems where long-range effects are essential. The learned latent variables recover physically meaningful electrical responses including Born effective charges, polarizabilities, and IR/Raman spectra.
Relevance to DENG.Group
Highly relevant to Yanhao Deng's MLIP development. The framework directly addresses the long-range electrostatics challenge for ionic conductors and interfaces — the group's core application. The ability to predict Born effective charges and dielectric response from standard energy/force training data is particularly valuable for solid electrolyte modeling. Compatible with multiple MLIP architectures including MACE.
Solid-State Battery Fundamentals¶
5. An analytical model to describe self-discharge rates in solid-state batteries¶
Source: Nature Energy (s41560-026-02047-0) · 📅 2026-05-01 · ↗ Open paper
Develops an analytical model showing that internal self-discharge in solid-state batteries is not solely determined by the electronic conductivity of the solid separator but also by its electrochemical stability. Physico-chemical analysis of charge loss reveals that both electronic leakage and thermodynamic driving forces for electrolyte decomposition contribute to capacity fade during storage. The model provides a framework for predicting shelf life and guiding separator and cell design.
Relevance to DENG.Group
Relevant to the entire Deng group working on solid-state batteries. The model provides a quantitative framework for understanding a critical practical issue — self-discharge and calendar aging — that directly impacts commercial viability. The coupling of electronic conductivity with electrochemical stability in determining self-discharge rates could inform computational screening criteria for solid electrolytes.