Nexeon technology overview

Nexeon has patented a unique way of structuring silicon so that it delivers extended cycle life and significantly increases battery capacity.

In contrast to carbon, Nexeon’s silicon anode materials have a much higher capacity for lithium and as a result are capable of almost ten times the gravimetre capacity per gram (mAh/g).

At the carbon anode: 6C + Li+ + e ↔ LiC6 ⇒ 372 mAh/g

At the silicon anode: 4Si + 15Li+ + 15e ↔ Li15Si4 ⇒ 3580 mAh/g

Nexeon’s patented silicon structures overcome the previous problems of poor cycle life encountered when using silicon by mitigating the volume expansion issue. These uniquely structured silicon anode materials deliver extended cycle life without degradation of capacity:

Nexeon technology overview

Nexeon is developing a range of materials with differing morphologies and capacities.

The first commercially available material is a low cost silicon capable of capacities up to 1000mAh/g.

A commercial 2600 mAh 18650 Li-ion cell today uses around 10g of graphite anode material. Just 2.6g of Nexeon’s unique first generation structured silicon can replace graphite.

First generation silicon material

Second generation material has a different morphology and has been optimised for even higher capacities, i.e up to 3600 mAh/g.

Second generation silicon material

Nexeon has designed its technology for easy adoption in existing Li-ion battery production lines. The graphite currently used can simply be replaced with Nexeon materials and used in combination with conventional polymer binders and current collectors as part of the standard battery manufacturing process. In this way, Nexeon technology truly offers a ‘drop-in’ approach.

Nanostructured materials

An interesting extract from a paper co-authored by Nexeon’s Bill Macklin may be read here.