Assessing the Thermal Safety of a Li Metal Solid-State Battery Material Set Using Differential Scanning Calorimetry

• DOI: 10.1021/acsami.3c13344
• Publication Date: 2023-11-22T20:14:41Z
• Authors: Nathan B. Johnson; Bhuvsmita Bhargava; Jonathan Chang; Samaa Zaman; William Schubert; Paul Albertus
• Keywords: Thermochemistry; Heat Generation

At the earliest stage of battery development, differential scanning calorimetry (DSC) a sample with all cell stack materials can provide quantitative data on reaction thermochemistry. The resulting thermochemical map expected reactions upon heating then guide chemistry and component development toward improved safety. In this work, we construct Li0.43CoO2 + C PVDF|Li6.4La3Zr1.4Ta0.6O12|Li microcell DSC samples capacity-matched electrodes test to 500 °C. Notable observations are: (1) ∼74% O2 released from cathode reacts form CO2 rather than molten Li produce Li2O, (2) PVDF pyrolysis (>400 °C) releases HF gas that exothermically LiF, (3) involving oxygen (e.g., Li2O formation) account for ∼60% total heat released, LiF ∼36% released.