New anode boosts battery energy density by 50%
LeydenJar unveiled a silicon anode that can boost battery energy density by 50%, paving the way for more compact, longer-lasting batteries.
Published on August 28, 2025
© LeydenJar
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LeydenJar, a Dutch battery innovator, unveiled a silicon anode called Silyte™ that can boost energy density by 50% compared to conventional graphite anodes. The innovative, porous, and flexible structure of Silyte™ enables it to expand and contract without damage, thereby resolving the longstanding issue of silicon anode instability. This breakthrough enables lighter, more compact, and longer-lasting batteries for consumer electronics and electric vehicles, while reducing the carbon footprint of production by up to 85%.
The anode is a critical component of a battery. It's the electrode through which conventional current flows into a polarized electrical device. In lithium-ion batteries, the anode material has a significant impact on the battery's energy density and overall performance. LeydenJar's Silyte™ anode is designed to replace traditional graphite anodes, which typically constitute about 50% of a lithium-ion battery's volume and limit potential energy density increases.
“Silicon anodes have long been the holy grail of battery design,” said Christian Rood, CEO of LeydenJar. “Silyte™ is the battery breakthrough that wearable AI has been waiting for. It’s the first pure silicon product that cell makers can use directly in existing production lines. We, and the wearable industry at large, believe silicon anodes will become the industry standard, unlocking new form factors and capabilities across all types of devices.”
LeydenJar's innovative technology
LeydenJar's silicon anode addresses the challenges associated with silicon's expansion and contraction during charging and discharging. Their innovative design allows the silicon to expand and contract without compromising the battery's structural integrity, which has been a major hurdle for silicon anodes until now. The Silyte™ anode boasts a 50% higher energy density compared to traditional anodes and can reach an energy density of up to 1350 Wh/L at the stack level. This increase in energy density means devices can be lighter, more compact, and have a longer battery life.
Beyond performance enhancements, LeydenJar emphasizes sustainability. The production of Silyte™ anodes results in an 85% reduction in CO2 emissions compared to conventional graphite anodes. This reduction is due to silicon's availability and LeydenJar's green production processes. The company's anodes are manufactured in a single step using a roll-to-roll PECVD machine in Eindhoven.
The facility has an annual production capacity of 70 MWh of pure silicon anode foil, sufficient for approximately four million smartphone batteries. LeydenJar has already shipped significant quantities of Silyte™ to customers globally and has been testing its performance in various battery formats in its R&D facilities. Moreover, thousands of cells incorporating Silyte™ have been produced on automated lithium-ion manufacturing lines at a leading cell manufacturer, using existing equipment as part of ongoing commercial validation projects.
