Solid-state battery steers lithium into carbon pores at low pressure
A laboratory battery design combines a modified solid electrolyte with porous carbon to manage stress as lithium accumulates. At room temperature and low operating pressure, one full cell retained 73.4 per cent of its capacity after 150 cycles. The peer-reviewed experiments distinguish pressure during operation from the substantially higher pressure used to make the cells.
Science··Morning
Carbon pores provide room for lithium
A porous carbon current collector gives accumulating lithium space to expand in a laboratory solid-state battery. The peer-reviewed Nature Communications study combines that structure with a modified sulfide electrolyte, the solid material through which ions move. Polymer connections between electrolyte particles improve resistance to crack propagation, while the carbon voids relax deposition stress. The design aims to redirect growth away from cracks that can become short-circuit pathways.[1]
Low-pressure cells completed repeated cycles
A full cell retained 73.4 per cent of its starting capacity over 150 cycles, operating at room temperature under approximately 0.3 megapascals. Its areal capacity was 2.4 milliamp-hours for each square centimetre. Changing the loading and cycling rate, another experiment recorded 78.8 per cent retention over 300 cycles. Tomography, pressure monitoring and simulations helped examine where lithium moved as the cells operated.[1]
Fabrication still required higher pressure
The low pressure refers to operation: fabrication used substantially higher pressure. A separate symmetric-cell experiment lasting more than 8,000 hours operated at 13 megapascals. For each key configuration, the team tested more than five independent cells; the published curves represent average or slightly above-average cells. These laboratory experiments leave cell scaling, manufacturing and prolonged practical use beyond their tested scope.[1]
