Research Digest — 2026-05-13¶
Phase-Field & Degradation Modeling¶
1. Saddle-node bifurcation in interfacial morphology selects battery degradation phase¶
Source: arXiv:2605.10252 · 📅 2026-05-11 · ↗ Open paper
Proposes a minimal nonlinear ODE for the dynamic active-area factor of a battery interface that exhibits a saddle-node bifurcation when the smoothing rate saturates with surface roughness. The bifurcation separates a smooth passivating phase from a morphologically unstable phase. The authors map four canonical anode configurations — graphite, silicon composite, lithium metal, and anode-free Li/Cu — onto the closure via end-of-cycling steady-state data, finding that the anode-free configuration sits within 5% of the saddle-node threshold, predicting a vanishingly small operational stability window. Three falsifiable predictions — critical current density, critical temperature shift, and mean-field critical-slowing-down exponent — are tested against publicly available data.
Relevance to DENG.Group
Highly relevant to the Deng group's phase-field simulation work. The bifurcation framework provides a parsimonious alternative to full phase-field models for predicting degradation regime transitions. The quantitative mapping of anode configurations to stability margins could guide the group's computational screening of interface architectures for solid-state batteries.
Interface Engineering & Stack Pressure¶
2. Perspective on Material Design and Interface Engineering toward Low-Stack-Pressure All-Solid-State Lithium Batteries¶
Source: Advanced Materials (10.1002/adma.73342) · 📅 2026-05-11 · ↗ Open paper
A comprehensive perspective from the Guo group at ICCAS presenting a fundamental understanding of the roles of stack pressure in all-solid-state lithium batteries and analyzing intrinsic challenges to achieve optimal battery performance under low-stack-pressure conditions. The work summarizes recent advances for reducing high-stack-pressure demands from the viewpoints of solid electrolyte design, active electrode material design, and interface engineering, including compliant interlayers, 3D-architected current collectors, and polymer-ceramic hybrid approaches.
Relevance to DENG.Group
Essential reading for the entire Deng group. The stack pressure problem is a central practical challenge for commercializing solid-state batteries. The review's analysis of the coupling between pressure, contact mechanics, and electrochemistry directly connects to the group's work on interface stability and could inform computational models of contact resistance evolution. The material design strategies for pressure reduction are particularly relevant for halide and polymer electrolyte development.
Halide Solid Electrolytes¶
3. Effect of Zr-Site Substitution on the Phase Stability and Ionic Conductivity of Halide Solid Electrolytes¶
Source: Ceramics International (10.1016/j.ceramint.2026.05.031) · 📅 2026-05-06 · ↗ Open paper
Systematically investigates the effect of Zr-site substitution on the phase stability and ionic conductivity of Li2ZrCl6-based halide solid electrolytes. The substitution-induced responses varied depending on the ionic radius and valence state of the substituents, with some substituents stabilizing the high-conductivity cubic phase while others induced phase transitions. The work identifies optimal dopant combinations that enhance ionic conductivity while maintaining structural stability.
Relevance to DENG.Group
Directly relevant to Mengke Li and Yan Li's halide electrolyte research. The systematic substitution study on Li2ZrCl6 provides experimental benchmarks for the group's DFT calculations of phase stability and ionic conductivity. The Zr-site doping strategy could be computationally extended to explore the full compositional space of doped halide electrolytes using the group's high-throughput screening infrastructure.
4. Interfacial problems and optimization strategies at the oxide solid-state electrolyte-electrode interface¶
Source: Ionics (10.1007/s11581-026-07167-x) · 📅 2026-05-11 · ↗ Open paper
A comprehensive review covering interfacial problems and optimization strategies at oxide solid-state electrolyte-electrode interfaces, including LLZO, LATP, and NASICON-type electrolytes. Discusses space charge layer formation, chemical incompatibility, poor wettability, and volume change mismatch. Reviews optimization strategies including buffer layer design, surface modification, composite electrode engineering, and advanced characterization techniques for interface analysis.
Relevance to DENG.Group
Relevant to Cheng Peng's grain boundary research and the broader group's interest in interface stability. The review provides a systematic catalog of oxide electrolyte interface failure modes and mitigation strategies that can inform computational models. The space charge layer and chemical incompatibility discussions are particularly applicable to the group's thermodynamic stability calculations.
Electrolyte Design Fundamentals¶
5. A molecular perspective on coordination, screening, and emergent length scales in lithium electrolytes¶
Source: arXiv:2605.10089 · 📅 2026-05-11 · ↗ Open paper
Develops a unified multiscale framework linking local coordination motifs, mesoscopic ionic organization, and macroscopic transport within a single physical picture for lithium electrolytes. Shows that increasing concentration drives a systematic evolution from solvent-dominated Li+ coordination to ion pairing, clustering, and correlated domains. In this regime, screening and transport are not independent phenomena but arise from the same underlying correlated structures, implying that rational electrolyte design must simultaneously control short-range coordination, mesoscale organization, and collective electrostatic response.
Relevance to DENG.Group
Relevant to the group's work on solid and polymer electrolyte design. The multiscale framework connecting coordination chemistry to macroscopic transport provides theoretical underpinnings for designing electrolytes where ion pairing and clustering effects matter — particularly relevant for concentrated polymer electrolytes and composite systems. The insight that screening and transport are coupled through the same mesoscale structures could guide the group's computational design of new electrolyte compositions.