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Saft team develops first metal hydride - sulfur Li-ion battery

5 May 2017

Researchers at France-based battery major Saft, along with colleagues at Université Paris Est, have, for the first time, used a nanocomposite metal hydride as the anode in a complete solid-state battery with a sulfur cathode and LiBH4 electrolyte.

The cell shows a high reversible capacity of 910 mAh g−1 with discharge plateaus at 1.8 V and 1.4 V. Capacity remains at 85% of the initial value over the 25 first charge/discharge cycles. A paper on their development is published in the Journal of Power Sources.

Lithium-sulfur (Li-S) batteries are one of the most attractive candidates for the next generation of high-energy rechargeable Li batteries because of their high specific energy at a working voltage of ca. 2.2 V. For the assembly of Li-S batteries, metallic Li as negative electrode is commonly paired with S as positive active material due to their high theoretical capacities (Li, 3860 mAh g-1; S, 1672 mAh g-1). However, the use of metallic Li deals with serious safety hazards as fire or explosion of the battery, thus considering its substitution by high capacity anodes as an interesting approach.

In the recent years, metal hydrides (MH) have been proposed as breakthrough negative electrode materials for lithium ion batteries (LiBs) owing to their high theoretical Li storage capacities, and suitable working potentials of 0.1-1.0 V vs. Li+/Li. MgH2 and TiH2 exhibit high theoretical capacities of 2038 mAh g-1 and 1074 mAh g-1 with average potentials of 0.5 and 0.16 V vs. Li+/Li, respectively. These hydrides exhibit excellent performance in half all-solid-state (ASS) cells with LiBH4 as solid electrolyte (SE) and metallic Li as anode. However, their implementation as negative active materials in complete cells has not been yet accomplished.

It is necessary to find suitable lithium-based positive materials with similar theoretical capacities and chemical compatibility with the electrolyte to pair them. In this context, the Sulphur/Lithium sulfide (S/Li2S) redox couple appears to be an ideal candidate. Indeed, it has been shown to offer an excellent compatibility and performance in ASS batteries using LiBH4 as solid electrolyte (~800 mAh g-1 after 50 cycles). From this inspiring background, we decided to evaluate the performance of MH anodes with the S/Li2S couple integrated in an ASS battery.

—López-Aranguren et al.

The team used a a hydride-based nanocomposite 0.8MgH2-0.2TiH2 as the anode material and a Li2S composite as the cathode. LiBH4 was used as the solid electrolyte due to its high Li+ conductivity of 10-3 S cm-1 at 120 ˚C.

Saft
Charge/discharge profiles at different C rates (C/50, C/20 and C/50, five cycles each) of the complete ASS battery and schematic representation of the discharge redox reaction. López-Aranguren et al. Click to enlarge.

The redox reaction for this cell can be written as:

Li2S + MgH2/TiH2 ↔ S + 2LiH + Mg/Ti    1.7/2.0 V vs Li=Li+

This is, to the best of our knowledge, the first high capacity all-solid-state battery using metal hydrides as anode. The compatibility of other solid electrolytes with high Li+ conductivity at lower temperatures such as Lim(BH4)nX (X = Cl, Br, I) is envisaged for this redox system. Further studies on the cathode and anode composites will be investigated in order to improve the overall performance of the battery.

—López-Aranguren et al.

The research was funded from the European Union’s Seventh Framework Programme for research technological development and demonstration under grant agreement Nº 607040 through the Marie Curie ITN ECOSTORE project.

Resources

  • Pedro López-Aranguren, Nicola Berti, Anh Ha Dao, Junxian Zhang, Fermín Cuevas, Michel Latroche, Christian Jordy (2017) “An all-solid-state metal hydride – Sulfur lithium-ion battery” Journal of Power Sources, Volume 357, Pages 56–60 doi: 10.1016/j.jpowsour.2017.04.088

May 5, 2017 in Batteries, Li-Sulfur | Permalink | Comments (9)

Comments

Sulfur and electrolytes are the barrier now, the anode is less important IMO.

Others have been looking at sulfur for some time now; but,nothing to take out of the lab yet.

Sion and Oxys have had lithium sulfur for years.
The Sion were used in a solar powered airplane.

It is worst that actual li-ion batteries, LOL, LOL.

Potentially lithium sulfur and be more than twice the energy density of the best lithium ion batteries. They have to keep the sulfur from bonding with the electrolyte.

¿Donde esta la novedad?. ¿25 ciclos?....Soy yo o es que no veo absolutamente nada. Para no variar claro.

Wh/kg may be important for airplanes but Wh/litre is more important for most practical applications. Cars, cell phones, laptops etc. are all volumetrically limited concerning battery capacity. For BEV's a bit of extra weight is not welcome, per se, but most of the energy required to accelerate it is recovered during braking and thus not a deal breaker. But try finding more space for it, and you will struggle.

TESLA already packed 100+ kWh (under the floor) leaving more space for passengers and luggage than large ICEVs.

TESLA could do 120 to 140+ kWh within 24 months.

All other manufacturers could do the same. It could be done with updated battery technology, without extra weight nor extra volume.

Energy density is estimated to increase about 5% per year. If solid state and or sulfur make it the energy density could double in just a few years.

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