Mele Claudio, Ravasio Filippo, Casalegno Andrea, Emanuele Elisa, Rabissi Claudio, Bozzini Benedetto
Dipartimento di Ingegneria dell'Innovazione, Università del Salento, via Monteroni, 73100 Lecce, Italy.
Dipartimento di Energia, Politecnico di Milano, via Lambruschini 4, 20156 Milano, Italy.
Molecules. 2025 Aug 21;30(16):3448. doi: 10.3390/molecules30163448.
Exposure of LIB materials to ambient conditions with some level of humidity, either accidentally owing to imperfect fabrication or cell damage, or deliberately due to battery opening operations for analytical or recycling purposes, is a rather common event. As far as humidity-induced damage is concerned, on the one hand the general chemistry is well known, but on the other hand, concrete structural details of these processes have received limited explicit attention. The present study contributes to this field with an investigation centered on the use of Raman spectroscopy for the assessment of structural modifications using common lithium iron phosphate (LFP) and nickel-cobalt-manganese/lithium-manganese oxide (NCM-LMO) cathodes. The impact of humidity has been followed through the observation of differences in Raman bands of pristine and humidity-exposed cathode materials. Vibrational spectroscopy has been complemented with morphological (SEM), chemical (EDS), and electrochemical analyses. We have thus pinpointed the characteristic morphological and compositional changes corresponding to corrosion and active material dissolution. Electrochemical tests with cathodes reassembled in coin cells allowed for the association of specific capacity losses with humidity damaging.
由于制造工艺不完善或电池损坏而意外地，或者出于分析或回收目的通过电池开启操作而故意地，将锂离子电池材料暴露于一定湿度的环境条件下是相当常见的情况。就湿度引起的损害而言，一方面其一般化学原理是众所周知的，但另一方面，这些过程的具体结构细节受到的明确关注有限。本研究以拉曼光谱法评估常见的磷酸铁锂（LFP）和镍钴锰/锂锰氧化物（NCM-LMO）阴极结构变化为核心展开调查，为该领域做出了贡献。通过观察原始阴极材料和经湿度处理后的阴极材料拉曼谱带的差异，跟踪了湿度的影响。振动光谱分析辅以形态学（SEM）、化学（EDS）和电化学分析。因此，我们确定了与腐蚀和活性材料溶解相对应的特征形态和成分变化。对重新组装在硬币电池中的阴极进行的电化学测试，将比容量损失与湿度损害联系起来。
