The life of lithium ion batteries is strongly conditioned by the degradation of the “Solid Electrolyte Interphase” or SEI, a passive layer that covers the surface of the negative electrode and is formed by degradation of the electrolyte, the decomposition products of which are deposited on the electrode. Over time or after many charge and discharge cycles, SEI tends to detach from the electrode. When this happens, the electrolyte is exposed to the negative electrode and breaks down again, progressively decreasing the amount of Lithium available in the electrolyte and therefore reducing the life of the battery. To ensure that batteries have a good quality SEI, specific measures are required to assess the quality of the SEI newly formed in the manufacturing process or after a certain period of storage or use. The invention consists on a new practical methodology to diagnose the presence of failures or micro cracks on the SEI surface.
Description
The life of lithium ion batteries is strongly conditioned by the degradation of the “Solid Electrolyte Interphase” or SEI. SEI is a passive layer that covers the surface of the negative electrode and is formed by degradation of the electrolyte, the decomposition products of which are deposited on the electrode. Over time or after many charge and discharge cycles, SEI tends to detach from the electrode. When this happens, the electrolyte is exposed to the negative electrode and breaks down again, progressively decreasing the amount of Lithium available in the electrolyte and therefore reducing the life of the battery.
To ensure that batteries have a good quality SEI, specific measures are required to assess the quality of the SEI newly formed in the manufacturing process or after a certain period of storage or use.
The invention consists on a new practical methodology to diagnose the presence of failures or micro cracks on the SEI surface.
The new technology developed by IMDEA Energy is aimed at quality control of Lithium – ion batteries and develops a test method faster than existing ones. It can be applied to:
Advantages and innovations
Unlike typical and well stablished quality control procedures in Lithium – ion batteries fabrication lines, which usually takes several weeks and are based on voltage evolution measurements over cell just after the fabrication, this concept is a methodology that provides quick information about the Solid Electrolyte Interface (SEI) layer conformation in newly manufactured batteries. It can also be used to assess the SEI layer ageing in a quick manner.
Market applications
Li-ion cells manufacturers with the necessity of a fast quality control procedure that will significantly shorten the stock of freshly produced cells before packaging and shipping to clients.
Li-ion cells integrators with the necessity of a fast quality control procedure to inspect the shipments of cells from their suppliers. Client companies can be:
IMDEA Energy Institute was created in 2006 as non-profit Foundation to promote and carry out R&D&i activities to contribute to the development of a sustainable and decarbonised energy system.
IMDEA Energy is strongly committed to the transfer of R&D outcomes to the productive sector and to seek joint eff orts with other technology research centers and universities, promoting excellence in research on energy issues and complementarity among different entities. IMDEA Energy gathers cutting edge skills and significant experience in R&D, testing and assessment of energy technologies and offers these services to private companies, universities and research and technological centers.
Research lines:
- Production of sustainable fuels: hydrogen, biofuels and valorized wastes
- Solar power
- Energy storage: electrochemical, thermal and thermochemical systems
- Energy systems with enhanced efficiency
- Power systems and Demand Management
- Valorization of CO2 emissions
- Analysis and assessment of energy systems
In 2020, it obtained the accreditation of ‘María de Maeztu’ Unit of Excellence, granted by the State Research Agency to identify and promote excellence in high-impact scientific research.
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