Grams versus Cycles: A Nine-Criterion Comparison of the Anode-Free Quasi-Solid Lithium-Metal Cell and the LiGra-BATTERY Concept

A research team at the Hong Kong University of Science and Technology (HKUST) has published, in Nature Communications, an anode-free lithium-metal cell with a quasi-solid gel electrolyte, produced by what the authors call dynamic integrated interface engineering. A silver-ion additive bound to anions modifies the bare copper current collector, builds a solid electrolyte interphase with an organic-rich inner and an inorganic-rich outer layer, and releases anions that polymerize the electrolyte into a gel. A pouch cell built on this strategy reaches 467 Wh/kg; a full coin cell retains 90% of its capacity after 200 cycles. This preprint compares that cell with LiGra-BATTERY, an ARBOK development in which the liquid electrolyte of a lithium cell is replaced by a non-liquid electrolyte based on TEGA, ARBOK's thermally expanded graphite (specific surface area 2,400 m²/g, thermal conductivity 100–470 W/(m·K), thermal stability to 3,400 °C, purity 30–50 ppm), with a measured +10% gain in cell efficiency and design targets above 300 Wh/kg and 3,000 cycles. Nine identical criteria are applied to both: what is changed, measured performance, cycle life, additive and electrolyte, anode and safety, cell format, end-of-life, cost per delivered kilowatt-hour, and material supply. The Hong Kong cell leads on specific energy per kilogram. An indicative model built on the 2025 average lithium-ion pack price of USD 108/kWh shows that the non-liquid electrolyte leads on every cost-bearing criterion: USD 0.036 per delivered kilowatt-hour against USD 0.54 for the anode-free cell at its demonstrated 200 cycles, zero liquid fraction at end of life, and manufacturability on existing lithium-ion lines. The comparison concludes that watt-hours per kilogram is a laboratory metric, and that the metric relevant to deployment is the cost of a delivered kilowatt-hour over the service life of the cell.