Technology

Battery systems

Batteries are systems. Getting the highest performance from rechargeable batteries requires a sound understanding of each of the component parts of cells and the way they interact. Anode materials must be optimised to work in conjunction with conductive additives, electrolytes and binders.

Real world operating conditions are as important as theoretical parameters in delivering user benefits across challenging applications.

 

‘At Nexeon, we are fortunate to be working with some of the best carbon, electrolyte and binder companies in the industry.”
Dr Scott Brown, CEO

Lithium Ion: The Battery Technology of Choice

Lithium ion (Li-ion) rechargeable batteries will remain the technology of choice for the foreseeable future. Compared with other mature technologies, Li-ion offers the best combination of:

  • Energy density (light weight, small volume)
  • Low self-discharge (retains its charge when not in use)
  • Established and low cost manufacturing
  • Wide range of formats

Other battery technologies are in development, but none is yet ready to challenge the performance of lithium ion.

Today’s applications demand ever greater battery performance so lithium ion batteries need to work even harder … the future lies in better lithium ion cells.

Lithium Ion: The Anode and the Cathode

The lithium ions in a Li-ion cell move from the cathode to the anode as the cell is charged, and back again on discharge.

To achieve ever improving energy density, we need a cathode which contains more lithium and anodes which can absorb more lithium.

Nexeon is developing improved anode materials.

Next Generation Lithium Ion: Silicon Anodes

Traditional lithium ion batteries use graphite in the anode: each gram of graphite stores enough energy to watch movies on a smartphone for about two hours.

Replace the graphite with silicon (and add some more cathode), and nearly ten hours of viewing are possible.

As the silicon expands it takes up more space, nonetheless, a silicon anode has the capability of storing more than twice as much energy on a volume basis as graphite.

So, why don’t all lithium ion batteries already use silicon anodes instead of graphite? Current forms of silicon expand on charging – and an expanding battery would break the phone!

Nexeon has been working to overcome this expansion issue and is developing silicon anodes that:

  • provide the high energy density benefits of silicon
  • are engineered so that that expansion is not a problem
  • can be used in conventional battery manufacturing plants: same equipment, similar battery chemistry
  • perform as well as graphite anodes in all other respects (high power rates, tolerant to temperature extremes etc)
Nexeon technology overview

Nexeon is a world leader in engineered silicon materials for battery applications. Nexeon has identified a class of material that the company believes will be one of the “best-in-class” in terms of energy density while maintaining physical anode dimensions for long cycle life.

Nexeon’s Li-ion battery anode technology uses silicon in several forms either to enhance or replace the traditional graphite anode. This has the potential to improve the performance of the current Li-ion batteries used in electric vehicles and a wide range of consumer electronics.

Nexeon’s development of silicon materials enables the production of batteries with higher energy density. Nexeon has designed its technology for easy adoption in existing Li-ion battery production lines. Nexeon’s silicon materials can be 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.

Nexeon materials

Nexeon is developing two types of silicon material solution:

NSP-1 

  • Silicon based composite powder designed for use in hybrid or low loading anode electrodes (recommended use up to 10wt.% loading)
  • Can be used to enhance existing graphite anode electrode active materials and is designed to provide improved cell capacity
  • Typical initial anode capacity 400 – 450mAh/g

NSP-2 

  • Silicon based material designed for use in high loading anode electrode formulations (up to 80 wt.%)
  • Significant increase in anode energy capacity and capacity density
  • Mitigates expansion through the use of engineered porosity at the particle level in combination with optimised anode design

Contact us to discuss your requirements.

Patents

Nexeon has a strong and deep patent portfolio. This covers silicon materials as well as electrolytes, binders etc., and the processes and equipment required for producing the silicon material and its incorporation into battery electrodes. Licensing opportunities are available.

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