Thin film calorimetry - Device development and application to lithium ion battery materials

Hendrik Wulfmeier, Daniel Albrecht, Svetlozar Ivanov, Julian Fischer, Rolf Grieseler, Peter Schaaf, Sven Ulrich, Andreas Bund, Holger Fritze

Producción científica: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

3 Citas (Scopus)


The work takes advantage of a newly developed measurement system which enables to investigate the thermodynamic properties of thin films including battery layer sequences. This technique, Thin-Film Calorimetry (TFC), is based on the detection of resonance frequency shifts of bulk acoustic wave resonators. Thin films with a thickness of several micrometers of the material of interest are deposited on the resonators. By measuring the temperature dependent shift of the resonance frequency, the device is working as a precise temperature sensor. The production or consumption of latent heat by the active layer(s) results in temperature fluctuations with respect to the furnace where the sensor is placed. Those information enable to extract the temperature and time dependence of phase transformations as well as the associated enthalpies. To cover a temperature range from -20 to 900 °C high-temperature stable piezoelectric resonators made of langasite crystals (La3Ga5SiO 14) are applied. Initially, metallic layers of tin and aluminum are used to test and verify this approach. The temperatures and enthalpies of solid-liquid as well as of solid-solid phase transformation are observed in the correct manner. Further, the thermodynamic data of the battery materials Li(Ni0.8Co0.15Al0.05)O 2- δ(NCA) and LiMn2O4-δ(LMO) obtained by TFC are determined and discussed. Both cathode materials are amorphous after deposition and show crystallization during heating at 460 °C (NCA) and 600 °C (LMO). The associated enthalpies are 5.3 kJ/mol (55 J/g) and 17.3 kJ/mol (96 J/g), respectively.

Idioma originalInglés
Título de la publicación alojadaMaterials Aspects of Advanced Lithium Batteries
EditorialMaterials Research Society
Número de páginas6
ISBN (versión impresa)9781632660909
EstadoPublicada - 2013
Publicado de forma externa
Evento2012 MRS Fall Meeting - Boston, MA, Estados Unidos
Duración: 25 nov. 201230 nov. 2012

Serie de la publicación

NombreMaterials Research Society Symposium Proceedings
ISSN (versión impresa)0272-9172


Conferencia2012 MRS Fall Meeting
País/TerritorioEstados Unidos
CiudadBoston, MA


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