Lotus Omnivore Engine Shows Up To 10% Better Fuel Economy Than Spray-Guided GDI Engines; Achieves HCCI At Extremely Light Loads
THINK Restarts Production of EVs in Finland

Ricardo and QinetiQ Demonstrate New Iron-Sulphide Li-ion Pack for HEVs

Redlion
The Ricardo-designed pack incorporating QinetiQ iron sulphide cells for the RED-LION project. Click to enlarge.

The Reduced cost Li-Ion (RED-LION) project—a two-year collaboration between Ricardo and QinetiQ with part-funding from the Department for Transport under the UK Energy Saving Trust Low Carbon R & D program (earlier post)— has demonstrated the potential of a new low-cost lithium-ion cell chemistry and associated flexible battery management system for hybrid electric vehicles (HEVs).

The aim of the project was to develop an alternative Li-ion cell chemistry that could be integrated within an HEV using a bespoke battery management system. Following completion of the project, the partners have announced that a battery pack using QinetiQ’s iron sulphide-based cell chemistry and Ricardo’s latest battery management system (BMS) has demonstrated significant cost and weight reductions compared with the reference Efficient-C full hybrid vehicle (earlier post).

Iron offers a number of advantages for use in a lithium-ion cathode material, including cost and safety and iron sulphide cathodes have been of interest for decades—a 1975 study by engineers from Rockwell International projected energy densities of 77 Wh/lb (169 Wh/kg) for lithium-iron sulfide batteries. QinetiQ has also been working on lithium-ion/iron sulphide cells for a number of years. For use as a cathode material, the iron sulphide must be lithiated. QinetiQ has developed new synthesis methods for lithiated iron sulphide that are quicker and easier than other methods.

To prove the potential of the alternative cell chemistry, the RED-LION project replaced the battery pack used in the Efficient-C prototype HEV with one using new cells capable of demonstrating suitable material cycle life, capacity, specific energy, rate capability and safety.

Custom cells were manufactured and packaged within a bespoke battery pack incorporating a number of novel features. Ricardo designed the overall battery pack to directly replace the existing unit, developing a new battery management system to manage the iron sulphide chemistry.

The prototype cells, designed and manufactured wholly by QinetiQ, have been shown to deliver a cycle life of more than 1,000 cycles at a limited depth of discharge. The high charge/discharge rate capability shown by the particular cell design would make it suited to both HEVs and low-range Plug-in Hybrid Electric Vehicles (PHEVs). Comparing the performance of the prototype high rate cells with the cells originally used in the Efficient-C HEV, a 20% reduction in weight, on a Wh/kg basis, was achieved.

Furthermore, QinetiQ estimates that significant cost savings are possible in comparison with current commercial production Li-Ion chemistries through cheaper raw materials and a more energy-efficient patented manufacturing process.

The new battery management system, developed by Ricardo based on a bespoke architecture, is fully adaptable to a range of cell chemistries and battery architectures. Ricardo has fully integrated its system into a battery pack containing the QinetiQ cells. The pack includes a number of innovations to improve performance and reduce cost, which are the subject of three Ricardo patent applications.

The project has demonstrated the potential of the cell chemistry within an HEV environment. While the current cell is most suited to HEVs and low-range PHEVs due to its high charge/discharge rate capability, the inherently high energy density exhibited by the chemistry combined with other anticipated improvements, would make it a strong candidate for all-electric vehicles, not least due to its highly attractive cost versus energy-density benefit, according to the partners.

Resources

  • A. G. Ritchie, P. G. Bowles and D. P. Scattergood (2004) Lithium-ion/iron sulphide rechargeable batteries. Journal of Power Sources Volume 136, Issue 2, 1 Pages 276-280 doi: doi:10.1016/j.jpowsour.2004.03.043

  • Herédy, Laszlo A. et al. (1975) Metal Sulfide Electrodes for Secondary Lithium Batteries. New Uses of Sulfur, Chapter 13, pp 203–215 doi: 10.1021/ba-1975-0140.ch013

Comments

HarveyD

Any idea of the actual (measured in numbers) performance reached during the above tests?

Any idea of the cost in Kwh?

Sirkulat

This battery technology may have a potential use in all-electric vehicles and that's fine, but I still favor PHEVs for the limitations they present to driving range. We frickin drive too much, too far, for too many purposes and we have to admit it. Producing electric cars designed to maintain the status quo of traffic jam-O-rama is a mistake for those who don't profit from car-addiction.

Henry Gibson

The full electric car has ruined the market for itself and plug in hybrids. The high prices and constant comments about limited range and fast charging and special charging stations and lack of low price engineering has made the introduction of an affordable automobile suitable to a large population impossible.

Lead acid batteries with a range extender have proven the ability to have adequate plug-in-hybrid vehicles that are suitable and cost effective for the average trips.

Very cheap batteries and cars are important for the market. Long range batteries are bad engineering.

Range extender engine generators do not need to be full power just as spare tires are sometimes not full tires. ..HG..

Treehugger

Mrs Gibson, where and when lead acid batteries have proven the ability to be adequate range extender ? never heard of such a thing before. Your reference are appreciated

Simodul

@Treehugger

HG can't stop talking of his ZEBRA and EFFPOWER batteries. They are all over his posts.

A little reference about ZEBRAs:
http://www.greencarcongress.com/2007/06/the-absolute-hy.html

And HE (Mrs? Henry is a male first name, isn't it?) didn't say the lead-acid batteries could be used as range extenders, he wants to use them as energy storage WITH a range extender.

This precision made, I have doubts about using a lead-acid battery that needs to be heated all the time...

Ole Grampa

bespoke bespoke bespoke.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)