Image: AI Generated
Range anxiety, the creeping fear that your electric vehicle will run out of charge before you reach your destination, remains one of the biggest psychological barriers to EV adoption worldwide. Current electric vehicles can travel around 700 kilometres on a single charge, a number that engineers and battery scientists have been trying to push past for years. Now, a team of researchers at South Korea’s Pohang University of Science and Technology has identified what they are calling a breakthrough: a gel-based solution that could allow EVs to approach 1,000 kilometres on a single charge, using materials that are cheaper and more practical than anything the industry has tried before.
Why silicon has always been EV batteries’ biggest promise and biggest problem
Silicon has long been the tantalising answer to the EV battery problem. It has a storage capacity far exceeding that of the graphite anodes used in most lithium-ion batteries today, making it an obvious candidate for next-generation battery design. The problem is what happens when you actually use it. During charging, silicon expands by more than three times its original size, then contracts back during discharge. Repeatedly done, this mechanical stress fractures the material, degrading the battery rapidly and making it unstable over time.The industry’s response has been to use nano-sized silicon particles, small enough that the expansion causes less structural damage. It works, up to a point. But nano-silicon production is technically complex and prohibitively expensive at scale, making it difficult to move from the laboratory into mass manufacturing without enormous cost implications.
How a gel polymer electrolyte solves the silicon expansion problem
The POSTECH team, led by Professor Soojin Park, PhD candidate Minjun Je, and Dr Hye Bin Son, took a different approach. Instead of shrinking the silicon down to a nanoscale, they kept it at the microscale particles, a hundred times larger than those used in conventional nano-silicon anodes and paired it with a gel polymer electrolyte rather than the liquid electrolyte found in standard batteries.The gel acts as a stabilising medium. Because it is neither fully liquid nor fully solid, it can accommodate the expansion and contraction of the larger silicon particles during charging cycles without the structural fracturing that makes standard micro-silicon unstable. The result, published in the journal Advanced Science, was a battery that remained stable even with micro-silicon particles five micrometres in size, a scale that had previously been considered too large to work reliably.
The numbers behind the breakthrough: 40% more energy density
The performance figures attached to the new system are significant. The silicon-gel electrolyte combination delivered ion conductivity comparable to conventional batteries using liquid electrolytes, meaning it does not sacrifice the speed at which charge moves through the battery. At the same time, it achieved approximately a 40% improvement in energy density over current battery designs. That improvement, applied to existing EV battery packs, is what puts the 1,000 km range figure within reach.”We used a micro-silicon anode, yet we have a stable battery,” said Professor Park. “This research brings us closer to a real high-energy-density lithium-ion battery system.”Critically, the manufacturing process behind the new system does not require exotic or expensive equipment. The team was explicit that the process is straightforward and ready for immediate application, an important distinction in battery research, where breakthroughs that cannot survive the transition to industrial manufacturing rarely reach consumers.
Why this battery discovery matters beyond the lab
The POSTECH breakthrough arrives at a moment when the global EV battery race is accelerating rapidly. China’s CATL recently unveiled its Qilin Compressed battery at the 2026 Beijing Motor Show, claiming a range of up to 1,500 kilometres using semi-solid-state chemistry. Meanwhile, Geely, Toyota, and a clutch of Western startups are all pursuing solid-state battery technologies with similar long-range ambitions, though most are not expected to reach mass production before the late 2020s or early 2030s.What distinguishes the POSTECH gel approach is its relative simplicity. Solid-state batteries, for all their promise, face serious manufacturing and durability challenges that have kept them out of production vehicles for years. A gel polymer electrolyte system that works with existing lithium-ion manufacturing infrastructure and delivers a 40% energy density gain without the expense of nano-silicon represents a more near-term pathway to meaningful range improvement.
What comes next for silicon gel EV batteries
The study was supported by the Independent Researcher Program of the National Research Foundation of Korea, and the team’s immediate next steps involve refining the system for durability over long charging cycles, the real-world test that all battery chemistries must eventually pass.For EV drivers, the significance is straightforward. A vehicle that can travel 1,000 kilometres on a single charge is no longer a car that requires careful route planning, deliberate charging stops, or constant attention to the battery indicator. It is simply a car that happens to run on electricity. Getting there has always been a chemistry problem. A team in South Korea may just have found a workable answer inside a jar of gel. Go to Source
