Thermomechanical Polymer Binder Reactivity with Positive Active Materials for Li Metal Polymer and Li-Ion Batteries: An XPS and XPS Imaging Study

Rabeb Grissa (1) , Alla Abramova (1) , Sacris-Jeru Tambio (1) , Margaud Lecuyer (2) , Marc Deschamps (2) , Vincent Fernandez (1) , Jean-Marc Greneche (3) , Dominique Guyomard (1) , Bernard Lestriez (1) , Philippe Moreau (1)

1 IMN - Institut des Matériaux de Nantes Jean Rouxel
2 Blue Solutions
3 IMMM - Institut des Molécules et Matériaux du Mans

The lithium and lithium-ion battery electrode chemical stability in the pristine state has rarely been considered as a function of the binder choice and the electrode processing. In this work, X-ray photoelectron spectroscopy (XPS) and XPS imaging analyses associated with complementary Mössbauer spectroscopy are used in order to study the chemical stability of two pristine positive electrodes: (i) an extruded LiFePO4-based electrode formulated with different polymer matrices [polyethylene oxide and a polyvinylidene difluoride (PVdF)] and processed at different temperatures (90 and 130 °C, respectively) and (ii) a Li[Ni0.5Mn0.3Co0.2]O2 (NMC)-based electrode processed by tape-casting, followed by a mild or heavy calendering treatment. These analyses have allowed the identification of reactivity mechanisms at the interface of the active material and the polymer in the case of PVdF-based electrodes.

Mots clés: PVdF; PEO; XPS; XPS imaging; LFP; NMC

Domaines: Matière Condensée [cond-mat]; Physique [physics]

Rabeb Grissa, Alla Abramova, Sacris-Jeru Tambio, Margaud Lecuyer, Marc Deschamps, et al.. Thermomechanical Polymer Binder Reactivity with Positive Active Materials for Li Metal Polymer and Li-Ion Batteries: An XPS and XPS Imaging Study. ACS Applied Materials & Interfaces, 2019, 11 (20), pp.18368-18376. ⟨10.1021/acsami.9b01761⟩. ⟨hal-02268937⟩