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Aditivos de electrolitos para mejorar baterías de ion de litio

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TODE20170110002
Publicado:
24/01/2017
Caducidad:
24/01/2018
Resumen:
Una universidad alemana ha desarrollado aditivos de electrolitos (complejos de alquilsilil) para mejorar el rendimiento de baterías de ion de litio. El uso de estos aditivos se traduce en una menor impedancia de carga y un mejor comportamiento de los ciclos a largo plazo, además de reducir la resistencia interfacial. Otro aspecto novedoso es la reducción de la presencia de productos de descomposición en el electrolito, principalmente LiF (fluoruro de litio). La universidad busca socios con el fin de establecer acuerdos de licencia y cooperación técnica.

Details

Tittle:
Electrolyte additives to enhance lithium ion batteries
Summary:
A German university developed anti-fading electrolyte additives that enhance the performance of lithium ion batteries. The use of the additives results in a lower charge-transfer impedance and an improved long-term cycling behaviour. The university offers a license agreement as well as a technical cooperation agreement.
Description:
A German university developed a set of alkylsilyl complexes (MOSi) as electrolyte additives, which enhance the performance of lithium ion batteries.

Previous studies have shown that electrolyte additives based on metals and semimetals (LiBOB, Mg(TFSI)2, Al(TFSI)3) as well as additives containing trimethylsiloxyl (TMS) groups, such as ligands, can have positive impact on the cycling performance of lithium ion battery cells. This is due to solid electrolyte interphase (SEI) and/or cathode electrolyte interphase (CEI) film forming properties and/or scavenging properties towards acidic impurities.

The technology offered by the German university combines these active functionalities (metal core and trialkylsiloxy based ligands) into one using aluminium, titanium and boron as metal cores combined with TMS ligands (M(TMS)x). The formed CEI was studied by means of electrochemical impedance spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The obtained results indicate that the investigated additives are either actively incorporated into the formed CEI layer (in case of aluminium, titanium as metal core) or interacting with decomposition products (in case of boron as metal core). This results in lower charge-transfer impedance and hence improved long-term cycling behaviour.

The university offers a license agreement as well as technical cooperation agreements to companies that are interested to further develop and enhance MOSi as a lithium electrolyte additive for lithium ion batteries. This technology offer addresses companies that produce battery cells.
Advantages and Innovations:
In comparison to the standard electrolytes the hereby described additives result in a twofold cycle life. The addition of the M(TMS)x based additives lowers the charge transfer impedance during prolonged cycling. MOSi leads to lithium ion batteries with enhanced anti fading performance. Furthermore all additives can help to decrease the interfacial resistance.

Further technical innovations are:
- All M(TMS)x additives were able to improve the cycling performance regarding Coulombic efficiency, energy efficiency and capacity retention of LiNi1/3Co1/3Mn1/3O2(NCM111)/Li half-cells and NCM111/graphite full-cells at high potentials (>4.3 V vs. Li/Li+).
- TMS complex for titanium, aluminium or boron for high voltage cells.
- Suppress the capacity fade at potential of up to 4.6 V vs. Li/Li+.
- Increase the energy efficiency of LiNi1/3Co1/3Mn1/3O2.
- Reduce the presence of electrolyte decomposition products in the electrolyte, mainly LiF.
- Titanium and aluminium complexes are actively incorporated into the formed CEI layer.
Stage of Development:
Prototype available for demonstration
IPs:
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
A German patent application was filed, international applications are still possible.

Partner sought

Type and Role of Partner Sought:
The university offers a license agreement as well as technical cooperation agreements to companies that are interested to further develop and enhance MOSi as a lithium electrolyte additive for lithium ion batteries. This technology offer addresses companies that produce battery cells.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
Si
Languages Spoken:
English
German

Keywords

Technology Keywords:
04001003 Storage of electricity, batteries