No SEI, No Loss: Beam Damage in Solid Sodium Electrolytes and the ARBOK-SODIQ Anode Platform

A recent peer-reviewed study showed that the electron beam used to image a sodium solid-state electrolyte does not damage it by radiolysis, the mechanism that governs most battery materials, but by electrostatic charging. Cryogenic cooling, the standard first response to beam damage in battery microscopy, therefore gave no benefit. Under controlled conditions the charged beam also drove highly mobile sodium ions out of the ionically conductive framework and nucleated sodium metal crystals on the opposite side of the sample, producing a fresh electrolyte-sodium interface equivalent to the first deposition in an anode-free sodium cell. The interface showed no reacted solid electrolyte interphase (SEI). Because SEI formation is the dominant source of irreversible capacity loss in liquid-electrolyte cells, its absence in this system explains how a sodium solid-state cell can operate for long periods without losing capacity. This note summarises the finding, places it in the context of sodium-ion storage, and describes how the ARBOK-SODIQ platform, a sodium-ion cell built on a TEGA anode, connects to it. The ARBOK-SODIQ anode offers a surface area of 2,400 m2/g, an interlayer spacing of 0.43-0.60 nm that admits Na+ reversibly, and a self-conducting matrix that needs no carbon black or metal additives. We outline an anode-free development direction in which a TEGA layer on the current collector provides the nucleation surface for sodium.