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Sodium-Zinc molten salt batteries for low-cost stationary storage

Objective

SOLSTICE answers the quest for stationary energy storage with two Na-Zn molten salt batteries, which operate at elevated temperature. The first concept benefits from the existing and successful ZEBRA® technology. Replacing their Ni-electrode by cheap and abundant Zn will only minimally affect other system parts thereby ensuring fast commercialisation. The second approach, an all-liquid cell, will apply the same chemistry, but does not require a ceramic electrolyte thus reducing cost further. Both battery concepts shall be brought to TRL5, and validated by four demonstrators, operating in a realistic environment at the end of the 4-year project. The demonstrators will be equipped with a self-learning battery management system and will be accompanied by upscaling, system integration and public acceptance studies. Na-Zn technology is exceptionally performant as it promises similar efficiency and depth of discharge as Li-ion cells, but extreme current densities. Featuring molten electrodes, Na-Zn cells actually work better when being cycled, as operation keeps them warm; several cycles per day and a lifetime exceeding 10,000 cycles can be legitimately expected. Na-Zn storage is perfectly sustainable: the raw materials, table salt and Zn, are abundant in the EU, cheap and not harmful. The environmental impact of Zn-mining and battery production is expected to be minimal. Finally, recycling is greatly simplified due to the large, molten electrodes. The most valuable element, Zn, can simply be recovered as pure metal and reused after dismantling the cells. Based on the existing knowledge on ZEBRA® battery production, the storage price of Na-Zn batteries is expected to approach 1 cent/kWh/cycle by 2030 - including balance-of-plant and recycling cost. Summing up, the Na-Zn technology is the cheapest molten-salt battery, is fully sustainable, fulfils all criteria of the call - and is even realistic to be commercialised by 2030.

Call for proposal

H2020-LC-BAT-2020
See other projects for this call

Funding Scheme

RIA - Research and Innovation action

Coordinator

HELMHOLTZ-ZENTRUM DRESDEN-ROSSENDORF EV
Address
Bautzner Landstrasse 400
01328 Dresden
Germany
Activity type
Research Organisations
EU contribution
€ 1 468 250

Participants (11)

SINTEF AS
Norway
EU contribution
€ 1 556 625
Address
Strindvegen 4
7034 Trondheim
Activity type
Research Organisations
EIDGENOSSISCHE MATERIALPRUFUNGS- UND FORSCHUNGSANSTALT
Switzerland
EU contribution
€ 809 300
Address
Ueberlandstrasse 129
8600 Dubendorf
Activity type
Higher or Secondary Education Establishments
CENTRO DE INVESTIGACIONES ENERGETICAS, MEDIOAMBIENTALES Y TECNOLOGICAS-CIEMAT
Spain
EU contribution
€ 405 500
Address
Avenida Complutense 40
28040 Madrid
Activity type
Research Organisations
DEUTSCHES ZENTRUM FUR LUFT - UND RAUMFAHRT EV
Germany
EU contribution
€ 749 336,25
Address
Linder Hohe
51147 Koln
Activity type
Research Organisations
POLITECNICO DI TORINO
Italy
EU contribution
€ 555 125
Address
Corso Duca Degli Abruzzi 24
10129 Torino
Activity type
Higher or Secondary Education Establishments
NORGES TEKNISK-NATURVITENSKAPELIGE UNIVERSITET NTNU
Norway
EU contribution
€ 317 648,75
Address
Hogskoleringen 1
7491 Trondheim
Activity type
Higher or Secondary Education Establishments
UNINOVA-INSTITUTO DE DESENVOLVIMENTO DE NOVAS TECNOLOGIAS-ASSOCIACAO
Portugal
EU contribution
€ 403 125
Address
Campus Da Caparica Quinta Da Torre
2829-516 Caparica
Activity type
Research Organisations
QUANTIS
Switzerland
EU contribution
€ 346 250
Address
Parc Scientifique Epfl Pse D
1024 Ecublens Vd
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
SENSICHIPS SRL
Italy
EU contribution
€ 352 781,25
Address
Via Delle Valli 46
04011 Aprilia
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
FZSONICK SA
Switzerland
EU contribution
€ 496 942,50
Address
Via Laveggio 15
6855 Stabio
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE
United Kingdom
EU contribution
€ 259 915
Address
South Kensington Campus Exhibition Road
SW7 2AZ London
Activity type
Higher or Secondary Education Establishments