Research Digest — 2026-10-21¶
Halide Solid Electrolytes¶
1. Hard-Acid High-Entropy Stabilized Chloride Octahedra for Halide Solid Electrolytes at High-Voltage of 4.8 V¶
Source: Advanced Functional Materials (10.1002/adfm.79022) · 📅 2026-10-13 · ↗ Open paper
Guided by hard acid-hard base interactions, the authors design a high-entropy chloride electrolyte Li2.5In0.5Y0.1Al0.1Zr0.1Ta0.2Cl6 in which multi-cation incorporation strengthens the metal-chloride octahedra. The reinforced M-Cl bonds suppress structural degradation and Cl- oxidation, enabling stable cycling of all-solid-state lithium batteries at 4.8 V.
Relevance to DENG.Group
Directly relevant to Yan Li and Mengke Li's halide electrolyte work: the high-entropy/hard-acid stabilization strategy is a concrete mechanism to test in their degradation and electronic-structure simulations, and the claim that weak elongated M-Cl bonds trigger Cl oxidation is verifiable with DFT on their existing Li3InCl6 models.
2. Synergistic In-N bonding boosts ionic conductivity in Li3InCl6 for all-solid-state batteries¶
Source: Journal of Power Sources (10.1016/j.jpowsour.2026.241735) · 📅 2026-10-13 · ↗ Open paper
Nitrogen is incorporated into the Li3InCl6 lattice, forming In-N bonds that modify the local Li coordination environment and increase the charge carrier concentration. The attractive-boosting synergy of these bonds accelerates Li+ migration, pushing conductivity beyond the ~1 mS/cm baseline of undoped Li3InCl6.
Relevance to DENG.Group
Mengke Li's ion transport mechanism simulations of halide electrolytes can directly probe how anion-site N doping reshapes Li migration pathways and vacancy chemistry in Li3InCl6 - a benchmarkable prediction of a dopant-driven transport change that MD or NEB calculations could confirm or challenge.
Interfaces & Degradation¶
3. Interfacial Instability of Halide Solid Electrolytes and Oxide Cathodes Under Low-Humidity Dry-Room Conditions¶
Source: Advanced Functional Materials (10.1002/adfm.78894) · 📅 2026-10-09 · ↗ Open paper
Contrary to the usual glovebox-based assessment, the authors show that Li3InCl6/LiNi0.83Co0.12Mn0.05O2 composite cathodes degrade severely even in a practical -40 C dew-point dry room. The study maps the humidity-driven interfacial degradation pathways that inert-atmosphere testing misses, with implications for realistic manufacturing protocols.
Relevance to DENG.Group
Highly relevant to Yan Li's halide degradation simulations: it defines a realistic (trace-moisture) chemical environment for catholyte/cathode interphase formation that her DFT or reactive MD models should reproduce, and it explains why simulated glovebox-condition stability can overpredict real-cell lifetime.
Grain Boundaries & Interfacial Transport¶
4. Empirical Understanding of Li-Ion Transport Through Hetero-Grain Boundaries Within Li-Electrolyte Interface for Stable Li Metal Anodes¶
Source: Advanced Materials (10.1002/adma.75383) · 📅 2026-10-13 · ↗ Open paper
The authors provide experimental evidence that hetero-grain boundaries (e.g. Li2O/LiF or Li2CO3/LiF analogues) inside inorganic SEI layers are favorable Li-ion pathways, using a tailored MgO/MgF2 heterostructure rich in hetero-GBs. Multifaceted analysis shows these heterointerfaces create a fast transport environment that stabilizes Li metal anodes.
Relevance to DENG.Group
Directly connects Cheng Peng's grain-boundary transport work and Umang Agarwal's heterogeneous-interface project: it is experimental confirmation that GBs between distinct ionic compounds accelerate Li transport, a hypothesis their GB-segregation and interface models can quantify at the atomistic level.
ML Interatomic Potentials & AI-Driven Discovery¶
5. Understanding compression-extension error asymmetry in universal machine-learning interatomic potentials¶
Source: arXiv:2610.24514 · 📅 2026-10-17 · ↗ Open paper
Benchmarking eleven pretrained universal MLIPs on ~3,200 parent structures under isotropic, uniaxial and biaxial DFT-referenced loading, the authors show every model has systematically larger force errors under compression than extension (ratios of 2.1-3.3 at +/-10% strain). They decompose the asymmetry into DFT force-scale growth versus relative-error evolution.
Relevance to DENG.Group
Important caveat for Yanhao Deng's MLIP work on electrolytes and electrodes: universal-predictor errors are not symmetric under deformation, so stress/strain-based predictions (elastic constants, chemo-mechanics at interfaces) need compression-side validation. The paired-path benchmark protocol is directly reusable for his potential evaluations.
6. NEP-kappa 2.0: A unified framework for phonon transport and nonequilibrium thermalization with machine-learning interatomic potentials¶
Source: arXiv:2610.25477 · 📅 2026-10-18 · ↗ Open paper
NEP-kappa 2.0 integrates DFT, material-specific MLIPs and pretrained force models in one workflow covering harmonic lattice dynamics, quasi-harmonic and self-consistent phonons, three- and four-phonon transport, Wigner coherence transport, and time-dependent phonon dynamics. Demonstrations on 3C-SiC, BAs and the halide Cs2AgInCl6 cover finite-temperature renormalization and higher-order scattering.
Relevance to DENG.Group
A ready-made thermal-transport pipeline for Mengke Li's thermal-property simulations of halide electrolytes and for Yanhao Deng's MLIP infrastructure; the Cs2AgInCl6 demo shows halide frameworks are already supported, enabling thermal conductivity predictions for the group's electrolyte candidates.
7. A GRACE Interatomic Potential for W-Ta Systems: Application to Ta Segregation and Pinning of Shear-Coupled Grain-Boundary Migration¶
Source: arXiv:2610.24432 · 📅 2026-10-17 · ↗ Open paper
A transferable W-Ta potential is built within the GRACE (graph atomic cluster expansion) framework, with the training set generated automatically by maximizing information entropy in a feature space rather than manually enumerating application-specific structures. Validation spans phase stability, defects, dislocations and melting; the potential is applied to Ta segregation and pinning of shear-coupled grain-boundary migration.
Relevance to DENG.Group
Two hooks for the group: the entropy-maximized active-learning data strategy is a template Yanhao Deng can use to build electrolyte/electrode potentials without hand-picked training sets, and the grain-boundary segregation plus shear-coupled GB migration application parallels Cheng Peng's GB studies in solid electrolytes.
Polymer Electrolytes¶
8. Developing an interaction model for solid polymer electrolyte/Li metal interfaces: LiTFSI-PEO as a case study¶
Source: Electrochimica Acta (10.1016/j.electacta.2026.150036) · 📅 2026-10-08 · ↗ Open paper
The authors reparameterize a classical MD force field for the LiTFSI-PEO solid polymer electrolyte in contact with an explicit Li metal surface, fixing a key flaw of standard Lennard-Jones combination rules that overestimated short-range interfacial ordering and slowed ionic dynamics. The result is an accurate, transferable interaction model for SPE/Li interfaces.
Relevance to DENG.Group
Methodologically a near-exact match for Naibing Wu's solid polymer electrolyte simulation work: the corrected Li-PEO/LiTFSI cross-interaction scheme and its documented failure modes should inform the force-field choices in his polymer-electrolyte and composite interface simulations.
9. Effect of Confinement on Ion Transport in Polymer Electrolytes¶
Source: Journal of Physical Chemistry B (10.1021/acs.jpcb.6c04811) · 📅 2026-10-06 · ↗ Open paper
All-atom MD shows that cylindrical nanoconfinement drives chain segregation in PEO-based electrolytes and reorganizes coordinating oxygen sites. The structural rearrangement suppresses ion-segment codiffusion along short chain segments and inhibits interchain hopping, clarifying how nanostructured confinement alters ion transport.
Relevance to DENG.Group
Speaks directly to Naibing Wu's composite polymer electrolyte simulations: confinement physics at polymer/filler or polymer/electrode interfaces is central to composites, and the identified mechanisms (suppressed interchain hopping under confinement) give him concrete observables to compute for his composite systems.