The intention was to develop new thin-film solar cell technology, but the manufacturing method proved more suitable for use in batteries. Thus, a 'failed' project became a promising start-up in a relatively short period of time.

From phone to car: 50% higher battery performance

For more information go to the website of LeydenJar



LeydenJar has developed a prototype that increases the energy density of batteries by fifty percent. Major suppliers of consumer electronics and car manufacturers are now knocking on the door. The manufacturing method was invented a few years ago by TNO scientist Dr Wim Soppe. Once it became clear that the method was much more suitable for batteries, the idea was patented and a spin-out plan was developed. An entrepreneurial duo took on the challenge, worked out a plan, sought financiers and within a year the company LeydenJar was a fact.


What makes the technology unique worldwide is the use of pure silicon rather than the traditional graphite for the anode part of the battery. Silicon offers a much higher capacity. The difficulty is to process silicon anodes in Li-ion batteries in a mechanically stable way. LeydenJar has succeeded in applying silicon anodes in a porous structure to a copper substrate using a special deposition process. Tests in the lab have shown that the battery's energy density can increase by as much as half.


These batteries will soon be found in a variety of products: smartphones and other consumer electronics, electrically-powered cars and, in time, even storage systems for renewable energy. Decentralised storage systems are an important part of the energy transition and are therefore a potential future market for LeydenJar. In the first instance, the company is focusing on improving battery life in smartphones and electric cars.


The coming period will be devoted to further improving the performance of the anodes in the battery. The battery size needs to grow, with more and more energy storage per litre and an increase in the number of cycles of charging and discharging to optimise the desired lifetime. Once that is achieved, production of silicon anodes can start and the industry players will have at their disposal a battery that can store 50% more energy for application in their products. The High Tech Campus in Eindhoven will accommodate the anode production plant.

In addition to TNO, LeydenJar works closely with the ZSW knowledge institute in Baden-Württemberg, the Universität Münster and TU Delft. In addition to TNO, UNIIQ, the Brabant Development Company and an informal investor are shareholders on the basis of convertible loans.

In 2019 TNO won second prize in the Impact Delivered category of the EARTO Innovation Awards in Brussels for a prototype that increases the energy density of batteries by 50%. This prototype is being brought to market by LeydenJar. The photo shows Dr Wim Soppe being presented with the award.

LeydenJar team photo. LeydenJar is a Tech Transfer spin-out

Breakthrough in battery industry: LeydenJar boosts battery energy by 70%

21 July 2020
LeydenJar Technologies, a Dutch spin-out of TNO, has developed a new anode that will drastically change the battery industry. For the first time, anodes in lithium-ion batteries can be made from 100%... Read more