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Breakthrough in Battery Industry: LeydenJar Boosts Battery Energy by 70%

Originally published by LeydenJar Technologies

LeydenJar Technologies, a Dutch spin-out of the applied research institute 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% silicon. This breakthrough offers two key benefits: batteries with a 70% higher energy density (1350 Wh/L) and 62% less CO2 emissions. The anode is ready for production and LeydenJar is preparing to massively scale-up its production capacity in the coming years.

Impact on innovations
Battery performance determines the pace of innovations in many tech sectors. This hugely significant innovation, focused on the silicon anode, can accelerate this process in the short term. Two important details are that the new technology does not push up production costs and is a ‘plug-in’ solution to existing battery gigafactory’s. A 70% higher energy density will have an impact on various sectors: consumer electronics, electric vehicles and the storage of renewable energy. 

Pure silicon replaces carbon
So far, it has only been possible to produce anodes with a small amount of silicon, because they were mainly carbon based.  As an anode material, silicon has ten times the capacity of carbon. Until now, the use of silicon was hampered by the mechanical limitations of the material. LeydenJar’s technology is derived from solar cell production technology (plasma-enhanced chemical vapour deposition, or PECVD).

70% more energy: 1350 Wh/L for more than 100 cycles
Tested pouch cells were built using commercially available battery materials, such as NMC 622 cathodes, and LeydenJar’s silicon anodes. An energy density of 1350 Wh/L at start of battery life was reached, with these cells demonstrating a cycle life of more than 100 cycles at a C/2 rate. DNV GL has confirmed these results. Looking forward, LeydenJar’s CTO, Yiseop Ahn, expects to be able to significantly improve the cycle life performance.

Founder and managing director Christian Rood:

The significance of battery capacity is huge. Electric driving, more intelligent smartphones, electric flying… everything and everyone is waiting for better batteries. Our solution is smart and easily incorporated. And there’s no additional cost. We cordially invite everyone to use and experience the advantages of LeydenJar’s silicon anodes.’

Porous silicon anodes
Our pure silicon anode is porous, allowing it to absorb the swelling of the silicon during lithation, and thus uses the maximum capacity of silicon, while remaining mechanically stable. The silicon is grown directly on the copper substrate with plasma vapour deposition (PECVD), a method used in the PV and semiconductor industry to grow thin films. We have altered this process to grow silicon columns that lead to high anode area loading, enabling energy density up to 1.350 Wh/l at lithiated stack level.

Images courtesy of LeydenJar Technologies

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