Johnson Nathan B, Bhargava Bhuvsmita, Chang Jonathan, Zaman Samaa, Schubert William, Albertus Paul
Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States.
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States.
ACS Appl Mater Interfaces. 2023 Dec 13;15(49):57134-57143. doi: 10.1021/acsami.3c13344. Epub 2023 Nov 22.
At the earliest stage of battery development, differential scanning calorimetry (DSC) of a sample with all battery cell stack materials can provide quantitative data on the reaction thermochemistry. The resulting quantitative thermochemical map of expected reactions upon heating can then guide chemistry and component development toward improved cell safety. In this work, we construct LiCoO + C + PVDF|LiLaZrTaO|Li microcell DSC samples with capacity-matched electrodes and test to 500 °C. Notable observations are: (1) ∼74% of the O released from the LiCoO cathode reacts with C to form CO rather than with molten Li to produce LiO, (2) PVDF pyrolysis (>400 °C) releases HF gas that exothermically reacts with Li to form LiF, and (3) reactions involving oxygen (e.g., CO and LiO formation) account for ∼60% of the total heat released, and reactions involving HF (e.g., LiF formation) account for ∼36% of the total heat released.
在电池开发的最初阶段，对包含所有电池组堆叠材料的样品进行差示扫描量热法（DSC），可以提供有关反应热化学的定量数据。由此产生的加热时预期反应的定量热化学图谱，随后可指导化学和组件开发，以提高电池安全性。在这项工作中，我们构建了具有容量匹配电极的LiCoO + C + PVDF|LiLaZrTaO|Li微型电池DSC样品，并测试至500°C。值得注意的观察结果是：（1）从LiCoO阴极释放的约74%的O与C反应形成CO，而不是与熔融Li反应生成LiO；（2）PVDF热解（>400°C）释放出HF气体，该气体与Li发生放热反应形成LiF；（3）涉及氧气的反应（例如CO和LiO的形成）占总释放热量的约60%，涉及HF的反应（例如LiF的形成）占总释放热量的约36%。
