Dataset of "Thermal Stability of Valuable Metals in Lithium-Ion Battery Cathode Materials: Temperature Range 500-800 °C"

Examination of the cathode part of a lithium-ion battery, which is composed of NMC spinel 622 (LiNi0.6Mn0.2Co0.2O2), and investigation of its stability during annealing at temperatures ranging from 500-800 °C. Determination of valuable metals (Li, Ni, Mn and Co) after exposure to temperatures from 500 to 800 °C using ICP-OES analysis. The correlation between element stability and the temperature of PVDF release, a binder in cathodes, was demonstrated by DTA. SEM-EDS performed local chemical analysis. XRD characterised the crystalline structures of the original material and changes after annealing at 800 °C. This work builds on Part I, which focusses on the thermal stability of the material in lower temperature ranges. This research aimed to gain a deeper understanding of the pyrometallurgical aspect of the recycling process and identify the ideal annealing temperature for maximising the recovery of valuable metals.

本研究针对由镍锰钴尖晶石622（NMC spinel 622，化学式为LiNi₀.₆Mn₀.₂Co₀.₂O₂）制成的锂离子电池正极片开展检测，并探究其在500~800℃温度区间退火过程中的稳定性。采用电感耦合等离子体发射光谱法（ICP-OES）对经500~800℃高温处理后的有价金属（锂、镍、锰、钴）含量进行测定。通过差热分析（DTA）揭示了正极粘结剂聚偏氟乙烯（PVDF）的析出温度与元素稳定性之间的关联。借助扫描电子显微镜-能谱仪（SEM-EDS）开展局部化学组分分析。利用X射线衍射（XRD）表征了原始材料的晶体结构，以及经800℃退火后的结构变化。本研究基于聚焦于低温区间材料热稳定性的第一部分研究展开。本研究旨在深化对回收工艺中火法冶金环节的认知，并确定可实现有价金属最大化回收的最优退火温度。