CATL’s Qilin condensed-state battery targets solid-state gains without solid electrolyte
CATL says its condensed-state Qilin battery delivers solid-state-like gains without a solid electrolyte. The cell uses a condensed electrolyte that behaves like a high-viscosity polymer gel, rather than a conventional liquid electrolyte or a brittle ceramic solid.
The company claims the cell reaches 350 Wh/kg and 760 Wh/litre, figures that would put it well above many current commercial lithium-ion cells. Higher gravimetric density can extend vehicle range without adding pack weight. Higher volumetric density can cut pack size, improve cabin packaging and give automakers more freedom in sedans, SUVs, pickups and commercial vehicles.
The central change is the electrolyte. Today’s lithium-ion batteries use a lithium salt dissolved in flammable organic solvents to carry ions between the cathode and anode. CATL’s condensed electrolyte is introduced as a liquid during manufacturing, then forms a polymer network after the cell is sealed, limiting flow, leakage and migration across the separator if the cell is punctured.
CATL pairs the electrolyte with a high-nickel cathode and a low-expansion silicon-carbon anode. The cathode uses stabilisation methods including high-entropy doping, a protective zero-contact-angle coating and nano-scale mechanical reinforcement to resist fatigue and side reactions during repeated charging. The anode uses silicon to store more lithium ions, while engineering at the particle and electrode level is intended to contain the swelling that normally damages silicon-rich designs.
The battery also uses a composite current collector designed to interrupt abnormal current flow, plus an aerospace-grade titanium alloy enclosure that reduces thickness and weight compared with a conventional aluminium housing. CATL says related aerospace battery work has already completed maiden-flight validation on a four-ton aircraft, and it is also advancing Naxtra sodium-ion cells for lower-cost electric vehicles and extreme cold-weather use. If scaled as claimed, the condensed-state design could give automakers a faster route to safer, longer-range EVs while solid-state batteries remain difficult to manufacture at volume.