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arxiv: 2604.10630 · v1 · submitted 2026-04-12 · ❄️ cond-mat.mtrl-sci

Electrochemical stability and lithium insertion at the Li|Li3OCl solid electrolyte interface

Deobrat Singh , Li-Yun Tian , Moyses Araujo , Raquel Lizarraga This is my paper

Pith reviewed 2026-05-10 16:13 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords Li3OClsolid electrolytelithium metal interfaceelectrochemical stabilitylithium insertiondensity functional theorysolid-state battery
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The pith

The Li|Li3OCl interface stays structurally stable while extra lithium atoms raise the energy in most electrolyte layers.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper models the boundary between lithium metal and the Li3OCl solid electrolyte with quantum mechanical simulations. It compares several possible alignments of the two materials to identify the lowest-energy arrangement. Charge shifts are found to stay confined near the contact plane rather than spreading through the electrolyte. Adding one more lithium atom costs energy in most positions inside the Li3OCl, which would prevent unwanted reactions or growth that could damage the interface. These outcomes indicate that the electrolyte can hold its integrity against the lithium anode.

Core claim

The Li|Li3OCl interface exhibits stable structural and electronic characteristics, with localized charge redistribution occurring near the interface region. The electrochemical stability against the insertion of an additional Li atom is also evaluated, showing that Li incorporation is energetically unfavorable in most layers of the electrolyte. These results suggest that the Li3OCl electrolyte maintains good electrochemical stability in contact with Li metal.

What carries the argument

Quantum mechanical simulations of multiple possible alignments between the lithium metal surface and the Li3OCl crystal, together with direct calculation of the energy required to place an extra lithium atom in each successive layer of the electrolyte.

If this is right

  • Only certain alignments of the lithium metal and Li3OCl surfaces are energetically preferred.
  • Electronic changes remain limited to the immediate contact zone.
  • Placing an extra lithium atom inside the electrolyte raises the total energy in most layers.
  • The electrolyte therefore shows resistance to the kinds of changes that would degrade battery performance.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the calculated stability persists during repeated charging and discharging, the material could be used without extra protective layers at the anode.
  • The same approach could be applied to rank other candidate solid electrolytes by their resistance to lithium insertion.
  • Mechanical mismatch or defects at the real interface might still create pathways for lithium that the ideal models miss.
  • These energy costs could be checked by comparing predicted and observed decomposition voltages in thin-film test cells.

Load-bearing premise

The chosen models of the interface and the standard setup of the calculations are assumed to capture the real behavior at the lithium-electrolyte boundary without major errors from the approximations used.

What would settle it

Direct measurement of the voltage or energy change when lithium is forced across the Li|Li3OCl contact in an operating cell; if the measured value is negative or near zero while the calculations predict positive energy, the stability claim would be contradicted.

Figures

Figures reproduced from arXiv: 2604.10630 by Deobrat Singh, Li-Yun Tian, Moyses Araujo, Raquel Lizarraga.

Figure 1
Figure 1. Figure 1: Fully optimized atomic structure of (a) anti￾perovskite material Li3OCl and (b) BCC Li system. The light green, dark green and red spheres are Li, Cl and O atoms, respectively. (c,d) k-resolved band structure calculations for the total density of states along the high-symmetry directions for Li3OCl and Li, respectively. (e,f) Corresponding projected density of states of Li3OCl and Li, respectively [PITH_F… view at source ↗
Figure 2
Figure 2. Figure 2: Fully optimized structural configurations of Li|LiOC interface system. The light green, dark green and red spheres are Li, Cl and O atoms respectively. First Author et al.: Preprint submitted to Elsevier Page 7 of 7 [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The relaxed structure of configuration A of Li|Li3OCl interface. The light violet color area is the interface. LOC(1), LOC(2), ... etc. present the first layer in the Li3OCl side, the second layer in the Li3OCl side, ....etc. Li(1), Li(2), ...etc present the first layer in the Li metal side, the second layer in the Li metal side, and so on. The inserted figure on the right side shows a zoomed-in atomic str… view at source ↗
Figure 4
Figure 4. Figure 4: Partical and projected density of states of Li|LOC interface for Li battery at few layers of Li side as shown by Li (1), Li (2), Li (3) as well as few layers of LOC side LOC (1), LOC (2), LOC (3), LOC (4) including interfacial region which includes one LOC layer and one Li-layer. First Author et al.: Preprint submitted to Elsevier Page 9 of 7 [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Interfacial electronic structure of the Li|Li3OCl system. (a) Charge density difference profile at the Li|Li3OCl interface, where yellow and cyan isosurfaces represent electron accumulation and depletion, respectively, revealing localized charge redistribution near the interface. (b) Planar-averaged electrostatic potential profile along the interface normal direction (𝑥-axis), showing the Li metal region, … view at source ↗
Figure 6
Figure 6. Figure 6: Electrochemical insertion energy of an additional Li atom at different atomic layers (𝑁) on the Li3OCl side of the Li|Li3OCl interface. Positive energies indicate energetically unfavorable Li insertion and thus electrochemical stability, whereas negative energies suggest favorable Li incorporation near the interface. In some layers two energy values appear due to two possible Li insertion configurations ar… view at source ↗
Figure 7
Figure 7. Figure 7: Minimum energy pathway for Li migration across the Li|Li3OCl interface calculated using the nudged elastic band (NEB) method. The dots represent the discrete NEB images, while the solid curve is a spline interpolation to guide the eye. The calculated migration barrier is approximately 0.89 eV. First Author et al.: Preprint submitted to Elsevier Page 12 of 7 [PITH_FULL_IMAGE:figures/full_fig_p012_7.png] view at source ↗
read the original abstract

Solid-state lithium batteries have attracted considerable attention due to their potential to provide improved safety and higher energy density compared with conventional liquid electrolyte batteries. However, the stability of the interface between Li metal anodes and solid electrolytes remains a critical issue that strongly influences battery performance. In this work, first-principles density functional theory calculations are performed to investigate the interfacial properties of a solid-state battery system composed of Li metal anode and Li3OCl solid electrolyte. The structural stability, electronic structure, and electrochemical behavior of the Li|Li3OCl interface are systematically analyzed. Several interface orientations are constructed and compared in order to identify the most energetically favorable configuration. The electronic properties and interfacial charge redistribution are further examined to understand the nature of the interaction between Li metal and the Li3OCl electrolyte. Our results indicate that the Li|Li3OCl interface exhibits stable structural and electronic characteristics, with localized charge redistribution occurring near the interface region. The electrochemical stability against the insertion of an additional Li atom is also evaluated, showing that Li incorporation is energetically unfavorable in most layers of the electrolyte. These results suggest that the Li3OCl electrolyte maintains good electrochemical stability in contact with Li metal. The present study provides atomic-scale insight into the interfacial behavior of Li|Li3OCl and highlights the potential of Li3OCl as a promising solid electrolyte for solid-state lithium batteries.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript reports first-principles DFT calculations on the Li|Li3OCl interface for solid-state lithium batteries. Several interface orientations are constructed and screened for energetic favorability; structural stability, electronic structure, and interfacial charge redistribution are analyzed; and Li insertion energies are evaluated layer-by-layer within the electrolyte. The central claims are that the interface exhibits stable structural and electronic characteristics with localized charge redistribution and that additional Li incorporation is energetically unfavorable in most layers, implying good electrochemical stability of Li3OCl against Li metal.

Significance. If the DFT parameters are properly documented and converged, the work supplies atomic-scale data on interface energetics and charge transfer that are directly relevant to solid-state battery design. The layer-resolved insertion-energy analysis is a concrete, falsifiable output that can be compared with future experiments or higher-level calculations.

minor comments (2)
  1. [Abstract] The abstract states conclusions from DFT but omits the exchange-correlation functional, plane-wave cutoff, k-point mesh, supercell dimensions, and any convergence or error estimates. These details are required to judge whether the reported energy differences and stability conclusions are robust against common DFT limitations such as self-interaction error or finite-size effects.
  2. [Interface models] The description of interface construction (orientations screened, termination choices, and relaxation protocol) should be expanded with explicit criteria for selecting the lowest-energy configuration and with quantitative measures of lattice mismatch or strain.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the detailed summary of our DFT study on the Li|Li3OCl interface and for the positive assessment of its significance for solid-state battery design. We are pleased with the recommendation for minor revision. No specific major comments were provided in the report.

Circularity Check

0 steps flagged

No circularity: standard DFT interface modeling

full rationale

The paper performs conventional first-principles DFT calculations to screen interface orientations by energy, map charge redistribution, and compute layer-resolved Li insertion energies. These are direct outputs of the simulations with no fitted parameters renamed as predictions, no self-definitional loops in any equations, and no load-bearing self-citations or imported uniqueness theorems. The modest claims of structural stability and unfavorable insertion follow immediately from the computed quantities without reduction to the inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work rests on standard DFT approximations whose accuracy for this interface is not independently verified in the provided text. No free parameters, new axioms, or invented entities are explicitly introduced in the abstract.

axioms (1)
  • domain assumption Standard DFT approximations (unspecified functional and settings) are sufficient to describe Li|Li3OCl interfacial stability and Li insertion energetics.
    Invoked implicitly by performing and interpreting the calculations without further justification.

pith-pipeline@v0.9.0 · 5560 in / 1271 out tokens · 28309 ms · 2026-05-10T16:13:39.263098+00:00 · methodology

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