Our Cell and Battery Technology Advantages

Developing and testing the value of  Ultra Light Li-S battery technology.  Huw Hampson-Jones, CEO of OXIS Energy describes the benefits of OXIS cells and battery technology.

The key components

  • A Lithium Metal anode
  • A Sulfur-based cathode
  • A safe electrolyte protecting the lithium metal
  • A state of the art separator

The key strengths

  • Lightweight
  • Safe
  • Full discharge
  • Cycle life
  • Cost effectiveness
  • Pressure tolerance
  • Maintenance free

Lightweight

Battery systems using metallic Lithium are known to offer the highest specific energy.

Sulfur represents a natural cathode partner for metallic Li and, in contrast with conventional lithium-ion cells, the chemicals processes include dissolution from the anode surface during discharge and reverse lithium plating to the anode while charging. As a consequence, Li-S allows for a theoretical specific energy in excess of 2700Wh/kg, which is nearly 5 times higher than that of Li-ion. OXIS’s next generation lithium technology platform offers the highest energy density among lithium chemistry:

  • 400 Wh/kg already achieved at cell level

Safety

OXIS patented chemistry provides  safety allowing it to meet certain international standards  criteria in terms of abuse testing.

Thanks to its two key mechanisms, a ceramic lithium sulfide passivation layer and a non-flammable electrolyte, our cells can withstand extreme abuse situations such as bullet and nail penetrations with no adverse reaction.

The Li-S battery of OXIS Energy can withstand the following tests with no adverse reaction.

Nail penetration

When punctured by an iron nail, OXIS Li-S cell continued to operate (voltage at 98%) with a temporary temperature variation of only +1.4⁰C.

Bullet penetration

A 5.56mm bullet was shot at a 10 meter range on a fully charged cell. The cell continued to operate at a reduced capacity and no fire or any noticeable temperature variation was observed.

Cycle life

OXIS Li-S scientists are constantly improving our Ultra Light cell. Within the next two years we aim to double the current cycle life to achieve upwards of 500 cycles.

Cost Effectiveness

Li-S production cost projections are significantly lower than Li-Ion due to lower raw material cost (i.e. Sulfur) and high energy density (less material required for same energy). This cost advantage is expected to be a key driver for widespread adoption of Li-S technology.

Pressure tolerance

In the Marine Autonomous Systems (MAS) project with the National Oceanography Centre (NOC), OXIS Li-S cells have been tested up to 660 bar (6600 m equivalent water depth). The performance of the cells remained unchanged.

Full discharge

OXIS cells have a 100% available Depth-of-Discharge. This compares with Li-ion batteries which are only used across 80% (or less) of their available discharge range. OXIS cells use all their stored energy – full discharge.

Maintenance free

OXIS cells have an indefinite shelf-life, with no charging required when left for extended period. Li-ion batteries require a recharge every 3-6 months to prevent failure and often causes significant warranty issues.

Eco friendly

The OXIS Li-S chemistry is considered to have less environmental impact when compared to other technologies such as Li-ion. The Li-S cell utilises sulfur in place of heavy metals such as cobalt, which have a significant environmental impact, whereas the sulfur used in OXIS manufacture is a recycled material, a by-product of the oil industry.