Li-S Technical, page-7

No. Based on the specific capacity at <250mAh/g compared to 550mAh/g for Li-S Energy battery you can do the maths.

It'snot just a matter of cycles that is critical to the commercial success of thebattery, it's a combination of factors as I have tried to expand on in the following. I'm just trying to interpret theavailable material and am by no means a battery expert.

The following are some slides taken from a presentation (https://www.slideshare.net/KTNUK/faraday-battery-challenge-webinar-series-lithiumsulfur-batteries-a-game-changer-for-aerospace-defense-and-automotive?from_action=save) onthe 2020 roadmap from the Faraday Battery Challenge (https://iopscience.iop.org/article/10.1088/2515-7655/abdb9a) Ireferred to previously. These provide some reference parameters that might put the Li-S Energy battery in context (if we ever get the information to compare).

The first (below) shows in teal the target of 400Wh/kg, 500 cycles,a temperature range and a 1C/1D charge/discharge rate. The Li-S battery meets 2 (if not 3) of the target parameters but from what we have seen it is only a smallpouch cell (30mAh) and does not yet have the capacity (from what we know) to do 1C/1D, that is,charge and discharge at the rate of 1 Amp for 1 hour (1Ah) where it wouldbecome viable for EVs etc.

The second one I like is the following which shows some measures to achieve a high energy Li-S cell. These are referred to as the five 5's as schematically shown below and explained in the paper at this link: https://www.sciencedirect.com/science/article/pii/S2542435120300015



The Five 5s for High-Energy Li-S Cells (from the paper linked above):
The history of Li-ion batteries demonstrates that concerted efforts in recognizing and tackling the key technical challenges form the bedrock for their commercial success. Li-S technology can undergo a similar transformation, provided the research community is in unison on maximizing the system-level specific energy. This target can be simplified as the achievement of the following five metrics, which we title the “five 5s” as shown above:

1. Sulfur loading >5 mg cm−2,
2. Carbon content <5% (Carbon is dead weight)
3. E/S ratio <5 μL mg−1,
4. E/C ratio <5 μL (mA h)−1, and
5. N/P ratio <5 in pouch-type cells.

This would enable the transition from a heavy, voluminous low-energy to a light-weight and compact high-energy system... It is important to note that the attainment of these metrics does not necessarily signal the culmination of the development path for Li-S batteries. Rather, it points to the minimum metrics that the community must strive to achieve in putting our best foot forward toward making Li-S batteries a reality.

One of the primary issue with Li-S batteries is their relatively low volumetric energy density as shown in the figure below and is an area (size) in which Li-ion has an advantage eg the Panasonic battery as in the Tesla EV. The Li-S Energy battery is around 600 Wh/kg but it's probably not been a focus to optimise Wh/L as yet. OXIS has gone but it's target region is shown.



Some reference material that might be relevant in the future if and when we find out more about the Li-S Energy battery.