OXIS Energy Reports In Lithium-Sulfur Cell Advancements – Achieves Over 300Wh/kg

NOV 25 2014 BY MARK KANE 13

OXIS Energy lab

OXIS Energy lab

OXIS Lithium Sulfur pouch cell (5 Ah / 10 Ah)

OXIS Lithium Sulfur pouch cell (5 Ah / 10 Ah)

OXIS Energy, who earlier this year exceeded the energy density mark of 300Wh/kg for Lithium Sulfur cells, now announced that it’s the first to develop larger 25 Ah cells.

Even larger 33 Ah capacity cells are in the works (should be ready in mid-2015) and according to OXIS Energy, vehicle manufacturers are already reviewing and evaluating the cell technology.

400 & 500 Wh/kg is still on the horizon:

“The OXIS scientific team is moving on apace and expects to achieve a goal of an energy density in excess of 400Wh/kg by the end of 2016 and in excess of 500Wh/kg by the end of 2018.

The cells continue to display the enhanced safety features that characterise Li-S with superior safety performance attained in a barrage of industry-standard tests.”

OXIS’ CEO, Huw Hampson-Jones stated:

“OXIS Energy is set to remain at the forefront of the world’s leading battery technology with these significant improvement gains. They are being made in partnerships with British and European academic and research institutions such as LEITAT of Spain, TNO of the Netherlands and the Foundation for Research and Technology in Greece. OXIS is on schedule to release commercial cells for use in applications in the USA and Europe in 2015.”

Categories: Battery Tech

Tags: ,

Leave a Reply

13 Comments on "OXIS Energy Reports In Lithium-Sulfur Cell Advancements – Achieves Over 300Wh/kg"

newest oldest most voted

Great energy density, but they are still working hard on improving cycle life – For those wanting more hard data (along with a lot of “future projects”) – I did the google for you – See:



Hm, they are already at 1000 cycles with 80% dod at 30°C. Ok, with only 0.2 C discharge and just 0.1 C charge rate. But for a dual design battery, why not.

Lets say we have a car with a 20 kwh standard battery and a 40 kwh LiS. At 0.2 C it would be able to deliver 8 kw constantly from the LiS. I can manage to hold 50 mph with 8 kw usage. With 12 kw usage (think 60 to 65 mph), you can drain both batteries equally in 5 hours. Regen would go 100% in the standard battery, so you even had some tolerance there.

And a 40 kw LiS can be charged at 3.7 kw with 0.1 C, no problme there (besides it takes 10 hours).

At the right price, it’s a buy.

+1. Dual battery technology solves a lot of issues.
Not only the wear and tear and price ones (with a cheaper batt pack for everyday use), but also it can also help the big batt to cool down quicker, getting ready for fast charging…


The 1000 cycle battery is very low density. The target for 2017 is 165 Wh/kg, and even worse, 153 Wh/L. The latter is 1/4 of what Tesla gets.

The high density battery – 400 Wh/kg in 2017 – is still only 400 Wh/L, so Tesla’s pack would need 50% more room. Its life is pegged at 330 cycles at the same low C-rate.

I think LiS will have some success with aircraft (esp RC), but that’s it. Low weight without low volume isn’t much use for EVs.

I think every EV maker would be happy with 180-200 at a fair and mass-scale price. We don’t “need” much more than that. We want it. Tesla’s battery is already too big for most users’ needs. Yet people want bigger ones. It is the classic “size means success” factor. The couple who live in a 5,000 sq foot house scenario. Their right-to, sure. But not sustainable and scalable as a community and culture.

What’s the voltage and physical size of these 25-33 Ah cells?

If cell specs are in the 1.7-2.5V of other lithium-sulfur-cell chemistries; this implies a 42-82 Wh per cell. At 300-500 Wh/kg this implies ~100g per cell (more an order of magnitude as ranges for specs are wide ranging).

you know what would be really cool (@Jay) is a page on insidevs that is kept up to date on battery statistics… Wh/kg for different technologies, including those under development (i.e., claimed but not proven), as well as cost/kWh, etc. A “quick glance” for those of us that can’t keep it all in our head when we hear these numbers.

Cool graphics and charts, or course.

Kinda like one of those “progress to goals” charts from a fundraiser. Or more of a “state of the charge” chart.



+3 🙂

+ 4

Operating temp???

It is technically correct to refer to ‘energy density’ as energy per unit volume. Energy per unit mass is ‘specific energy’.