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Copos de grafito como material catódico en baterías recargables de aluminio y cloruro-grafito para almacenamiento de energía estacionaria a nivel de red

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOCH20170614001
Publicado:
30/06/2017
Caducidad:
30/06/2018
Resumen:
Una universidad suiza ofrece un nuevo proceso de fabricación de baterías de aluminio y cloruro-grafito. La densidad de energía se duplica mejorando el rendimiento del cátodo de grafito y el coste de fabricación se reduce gracias al uso de materias primas abundantes y económicas. El proceso se emplea para el almacenamiento de energía doméstica estacionaria y almacenamiento de energía a nivel de red. La universidad busca socios industriales que dispongan de departamento de I+D con el fin de establecer acuerdos de licencia y lanzar la tecnología al mercado.

Details

Tittle:
Graphite flakes as cathode material in rechargeable aluminium chloride-graphite batteries for grid-level stationary energy storage.
Summary:
A Swiss university of technology offers a new manufacturing process for aluminium chloride-graphite batteries.
The energy density is doubled by improving the performance of the graphite cathode. The manufacturing cost is reduced by using cheap and abundant raw materials. The cycling life is long without capacity loss.
One field of application is household stationary storage and another one is grid-level storage.
License agreement partners for the introduction to the market are sought.
Description:
Background
The future success of renewable but intermittent energy sources such as solar and wind will largely depend on the availability of low-cost, TWh (terawatt-hour)-level stationary storage systems. Furthermore, there is a pressing need to locally and globally stabilize and diversify the electric grid. Large stationary installed batteries are expected to play a major role in this regard, in addition to conventional storage means such as pumped hydro. For ensuring their long-term sustainability, electrochemical storage technologies shall exclusively comprise highly abundant chemical elements.
Towards these goals, rechargeable aluminium chloride-graphite batteries make for an appealing option. Aluminium is an abundant element in the earth crust, it is non-toxic and has compared to other metals (apart from lithium) one of the highest energy densities. Combined with AlCl3 (aluminium chloride)-based ionic liquid, aluminium makes for a safe and easy to fabricate anode. On the cathodic side, synthetic graphite has been shown as the most promising candidate so far. However, the overall competiveness of this battery technology is hampered by the costly manufacturing of synthetic graphite, such as by chemical vapour deposition. The presented invention offers a cost-effective solution.

Invention
The cathode was designed from natural graphite flakes of ca. 50 -Y-micro;m (micrometre) in lateral size. These flakes can be easily manufactured from typical natural graphite ore rocks, by means of crushing, floatation and chemical purification (standard industrial processes), combined with secondary processing for reducing the flake size (sonication, ball-milling etc.). The retention of flaky morphology upon fragmentation without folding of the edges has been identified as a minimal and sufficient criterion for high electrochemical performance.
The major performance metrics are: energy density up to 62 Wh kg-1 (watt-hour per kilogram), power density 500-1000 W kg-1, energy efficiency 90% and long cycling life with >5000 cycles without capacity loss.

Fig. 1 SEM (scanning electron microscope) image of natural large graphite flakes after ball milling.
Fig. 2 Testing assembly for the new batteries.

The difference to vanadium flow batteries and other battery technologies is the earth-abundance of its components and the low manufacturing cost, which ultimately will lead to a low capital cost for stored energy (¢ / kWh-cycle). All stationary battery technologies based on vanadium, lithium etc. are eventually questioned due to the limited and uneven natural abundance of these elements in the earth crust.

Application:
One field of application is utility scale stationary storage e.g. household stationary storage, where the battery stores the surplus of solar power during the day. Another field of application is grid-level storage, where the battery equilibrates sudden drops and peaks in electricity demand.

Describe the desired cooperation:
An industrial partner is sought, who has an R-Y-D facility and is interested in licensing the technology. It is the task of the industrial partner to develop a market-ready product.
Advantages and Innovations:
- Cost-effective production of cathodes from natural graphite
- Two-fold higher energy density as compared to previously reported values for synthetic graphitic foams. Energy density up to 62 Wh kg-1, power density 500-1000 W kg-1
- energy efficiency 90%
- Long cycling life with >5000 cycles without capacity loss.
- Non-toxic, high safety (absence of any flammable component)
- Abundant raw materials (and not using critical raw materials - Circular Economy related): The difference to vanadium flow batteries and other battery technologies is the earth-abundance of its components and the low manufacturing cost, which ultimately will lead to a low capital cost for stored energy (¢ / kWh-cycle).
Stage of Development:
Prototype available for demonstration
IPs:
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
EP

Partner sought

Type and Role of Partner Sought:
The specific area of activity of the partner:
Companies in the field of battery production, more specifically for large stationary storage units.
One field of application is utility scale stationary and another field of application is grid-level storage.

The tasks to be performed by the partner sought:
The industrial partner will license the technology, develop a market-ready product and introduce the product to the market.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English
German

Keywords

Technology Keywords:
04002013 Redes inteligentes
04001003 Storage of electricity, batteries