A microscope destroys what it looks at. The electron beam that shows you the atoms of a battery also rewrites them — and for years that has quietly bent the conclusions of battery science.
The beam damage is electrostatic, not radiolytic
American researchers have now shown how it happens in a solid sodium electrolyte. Not radiolysis — electrostatic charging. That is why the cryogenic cooling every lab reaches for first gave no benefit here. The safe window is the first 10–50 electrons per square angstrom, before the material starts to change. Think of dose as water pressure in a hose: a pretty picture needs a lot of it, but too much and you are studying a different material.
A useful accident grew a fresh interface
Sodium ions in this electrolyte are so mobile that the charged beam chased them out of the framework and grew sodium metal crystals on the opposite side — a fresh interface, the same as the first deposition in the anode-free sodium cell the same group built in 2024. Next they can study the crystallography of sodium growing straight out of that interface — the design data a better cell is built on.
No SEI means no loss
What they saw: no SEI. That film of side reactions is what eats a lithium-ion cell’s capacity from the first cycle. Phone, laptop, car — the charge you lose is mostly SEI. Every cycle a little more is locked into that film, and it never comes back. Here it never forms. No SEI — no loss.
Sodium comes from salt
Sodium comes from salt — it is everywhere salt is, with no mine in a handful of countries to depend on. Lithium is scarce, and a lithium cell leans on copper and cobalt. The sodium-ion market is heading for $8–13 bln by 2035. Its natural ground is stationary grid storage and renewables integration, where sodium’s cost and resources outweigh lithium’s energy density, and cold-climate systems.
ARBOK-SODIQ puts a TEGA anode in place of hard carbon
ARBOK-SODIQ is a sodium-ion battery with a TEGA anode in place of hard carbon. The anode surface is 2,400 m²/g — 4–8 times that of hard carbon. The spacing between layers is 0.43–0.60 nm: sodium goes in, where ordinary graphite (0.335 nm) lets none through. The anode is self-conducting, with no carbon black, no additives and no metals. The cell delivers 3.1 V and 150–175 Wh/kg, charges fully in under 10 minutes, works from −40 to +70 °C and reaches up to 500,000 cycles in surface mode.
The cathode is a layered Na-Fe-Mn oxide made from soda — from the same brine that gives desalinated water. TEGA itself comes off a mobile unit at the customer’s site: up to 1 t/h at about $20/kg.
The next step is to take the anode out altogether
The solid-electrolyte result says sodium plates cleanly on a bare metal collector with no SEI. A TEGA layer on that collector gives sodium a surface to nucleate on — graphene-grade area at battery volumes, which nobody else can make. Others proved the interface is clean. We make the material to build on it.