Red non-toxic and environmentally friendly γ -phase cerium sulfide powders have promising applications in the fields of coatings, outdoor displays and smart buildings. However, the development of an environmentally friendly preparation process and the improvement of production efficiency of cerium sulfide powders remain major challenges. In this study, eco-friendly γ -Ce 2 S 3 powders with excellent color properties have been produced by adding ammonium thiocyanate to the precursor of cerium without H 2 S or CS 2 . The effect of impurities (mainly Ce 2 O 2 S) with different amounts on spectral properties of cerium sulfide powders has been studied through chemical and physical methods. In addition, the significance of impurity doping on the reaction synthesis was studied by combining detailed experimental characteristics with density functional theory calculations. The results show that the reduction of impurity content can greatly improve the chromaticity value of γ -Ce 2 S 3 and change color from dark red to bright red.
The increasing retirement of LiFePO 4 (LFP) batteries provides a unique chance for advancing the direct regeneration of spent lithium-ion batteries (LIBs). However, the existence of Al impurities from current collectors during the pretreatment of recycling poses a challenge. In this study, we enhance the direct regeneration process of spent LFP material by utilizing Al impurities to replace some cationic sites in the olivine structure. This approach achieves simultaneous elemental compensation and valence restoration, promoting the regeneration of LFP with stable structure and enhanced Li + diffusion rate. The regenerated LFP with Al doping exhibits an initial discharge capacity of 153.9 mAh g -1 , good rate performance with capacity of 112.1 mAh g -1 at 5 C (1 C = 170 mAh g -1 ), and excellent cycling stability (96.4 % capacity retention after 200 cycles). This strategy introduces a threshold for Al impurities and offers a chance to guide the future direct regeneration of LFP materials.
危险品化学品经营许可证（带存储）