The recovery of spent lithium iron phosphate batteries (LFPBs) has significant meaning in resource recycling and environmental protection. In order to investigate the effect of thermal treatment on the spent LFPBs cathode plate, in this paper, the thermogravimetric-differential scanning calorimetry (TG-DSC) of spent LFPBs cathode plate is researched. TG-DSC results indicate that two stages of weight losses and a stage of weight gain appear during the heating process with a weight change of −3.7, +1.0, and −2.4%. DSC curve showed two endothermic peaks at 165.6, 657.5 °C and two exothermic peaks at 475.6, 532.2 °C. XRD results indicate that LiFePO4 is oxidized to Li3Fe2(PO4)3 and Fe2O3 during the heating process and the electrode material could be easily separated from aluminum foil due to the pyrolysis of the binder. SEM-EDS results indicate that the agglomeration degree of cathode powders decreased after the TG-DSC test, the mole fraction of C and F decreased from 23.98 and 7.03% to 1.06 and 0.32%, which was due to the pyrolysis of binders and conductive additive.
Spent LFPBs Cathode sheets TG-DSC test XRD SEM-ED
This is a preview of subscription content, log in to check access.
This work was funded by the Research Fund Program of State Key Laboratory of Rare Metals Separation and Comprehensive Utilization (No. GK-201806) and Anhui Province Research and Development Innovation Project for Automotive Power Battery Efficient Recycling System for which the authors are grateful.
Tu X, Zhou Y, Tian X et al (2016) Monodisperse LiFePO4 microspheres embedded with well-dispersed nitrogen-doped carbon nanotubes as high-performance positive electrode material for lithium-ion batteries. Electrochim Acta 222:64–73CrossRefGoogle Scholar
Aifantis KE, Hackney SA, Dempsey JP (2007) Design criteria for nanostructured Li-ion batteries. J Power Sources 165(2):874–879CrossRefGoogle Scholar
Yang Y et al (2017) A closed-loop process for selective metal recovery from spent lithium iron phosphate batteries through mechanochemical activation. ACS Sustain Chem Eng 5(11):9972–9980CrossRefGoogle Scholar
Bian D, Sun Y, Li S et al (2016) A novel process to recycle spent LiFePO4 for synthesizing LiFePO4/C hierarchical microflowers. Electrochim Acta 190:134–140CrossRefGoogle Scholar
Shin EJ, Kim S, Noh JK et al (2015) A green recycling process designed for LiFePO 4 cathode materials for Li-ion batteries. J Mater Chem A 3(21):11493–11502CrossRefGoogle Scholar
Wang W, Wu Y (2017) An overview of recycling and treatment of spent LiFePO4 batteries in China. Resour Conserv Recycl 127:233–243CrossRefGoogle Scholar
Chen J, Li Q, Song J et al (2016) Environmentally friendly recycling and effective repairing of cathode powders from spent LiFePO 4 batteries. Green Chem 18(8):2500–2506CrossRefGoogle Scholar
Liu YL, Wu JY, Li H (2014) Fundamental scientific aspects of lithium ion batteries (IX)—Nonaqueous electrolyte materials. Energy Storage Sci Technol 3(3):262–275Google Scholar
Zheng R, Zhao L, Wang W et al (2016) Optimized Li and Fe recovery from spent lithium-ion batteries via a solution-precipitation method. RSC Adv 6(49):43613–43625CrossRefGoogle Scholar
Huang C, Yang H, Li Y et al (2015) Characterization of aluminum/poly (vinylidene fluoride) by thermogravimetric analysis, differential scanning calorimetry, and mass spectrometry. Anal Lett 48(13):2011–2021CrossRefGoogle Scholar