Nanostructured pure silicon anodes:
The battery industry is well aware of the theoretical tenfold capacity of silicon compared with graphite anode material. Because the capacity of existing graphite anodes is the main bottleneck for a Li-ion battery cell, to reach a higher energy density, scientists all around the world are focusing on creating silicon anodes.
However, the problem with silicon as anode material, is that it expands with 300% in the lithiation process, leading to a brittled and useless anode material. A number of high tech ventures and some corporations have developed methods to include incremental silicon nanoparticles in composite structures, which can be included in a similar coating process as for graphite anodes.
LeydenJar Technologies is unique to use 100% silicon anodes, leading to superior anode capacity, created via depositioning directly on copper foil in one machine.
Originally from solar panel technology, LeydenJar’ anode development is fueled by a multidisciplinary team of applied scientists from ECN, TU Delft, and ZSW.
The proprietary (patents pending) and adjusted PECVD technology enables LeydenJar Technologies to create a very specific and mechanically stable material of nanostructured silicon pillars directly on top of copper foil, which is used in the battery industry as current collector. We can very precisely manage the porosity of the structure, leading to an anode material that can both achieve the highest capacity, and remain stable over many cycles. We have achieved an area capacity of our anode material of 2,6 mAh per cm2, and are targeting an area capacity of 3 mAh/cm2 or higher.
LeydenJar Technologies’ pure silicon anode needs to fit with the electrolyte and cathode material in the battery cell. We are currently testing various combinations of electrolyte additives to manage the SEI layer between our anode and the electrolyte, and to optimize the first cycle losses and Coulombic Efficiency. In Q1 2017, we will test our optimized anode and electrolyte with NMC cathode material in pouch cells, tested by the battery technology institute ZSW in Germany. We will demonstrate our high and stable capacity over a minimum of 100 cycles.