Preparation of FePO 4 and LiH 2 PO 4 from cathode mixture materials of scrapped LiFePO 4 batteries
- PDF / 4,250,597 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 104 Downloads / 320 Views
Preparation of FePO4 and LiH2PO4 from cathode mixture materials of scrapped LiFePO4 batteries Yongzhi Chen2 · Lihua Wang1 · Hao He3 · Jian Li4 · Yimin Li2,3 · Rutie Liu2 · Dongyang Li2 · Zheyu He2 Received: 6 September 2019 / Accepted: 20 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Typically, LiFePO4 batteries (LFPBs) contain a shell, cathode mixture materials, anode mixture materials, current collector, electrolyte, separator, and other components. Cathode mixture materials are composed of a binder, conductive additive, and LiFePO4/C. After LFPBs are scrapped, their appropriate disposal is necessary to avoid pollution. This study investigated the recovery of Li, Fe, and P by hydrometallurgy from scrapped LFPBs. To remove the binder, conductive additive, and 3PO4 as carbon coating layer, recycled cathode mixture materials are oxidized to L i3Fe2(PO4)3 and Fe2O3 at 600 °C. Using H a leaching agent, the optimal leaching efficiencies, i.e., 99.2% and 97.68% for Li and Fe, respectively, can be achieved when the reaction time, temperature, Li in the Li3Fe2(PO4)3 and Fe2O3 mixture materials to the H3PO4 molar ratio (L/P ratio), and H3PO4 concentration are 12 h, 95 °C, 1:5, and 0.5 mol/L, respectively. Moreover, Li can be leached into a solution efficiently and recovered as L iH2PO4, while Fe and P can be selectively precipitated as FePO4·xH2O. FePO4 is prepared by a heat treatment. Furthermore, LiFePO4/C is re-synthesized by FePO4, LiH2PO4, Fe2O3, LiOH, and sucrose.
1 Introduction Over time, the incongruity between the environment and economic development is becoming increasingly prominent. Environmental issues have become the focus of social concern. Established green and low-carbon energy sources have become the primary focus for new energy devices and renewable energy development [1–3]. Some countries are accelerating the development of electric vehicles (EVs) and hybrid electric vehicles (HEVs) to protect the environment. * Lihua Wang [email protected] * Hao He [email protected] * Jian Li [email protected] 1
School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China
2
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China
3
Research Centre for Materials Science and Engineering, Guangxi University of Science and Technology, Liuzhou 545006, People’s Republic of China
4
School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China
Lithium-ion batteries (LIBs) play an important role as a primary energy source and a back-up supply system in EVs [4–8]. Since their first commercial introduction by SONY in 1991, LIBs have developed rapidly [9]. In China alone, the sales of LIBs have rapidly increased from 0.6 GWh in 2011 to 30.5 Gwh in 2016, indicating a more than 50-fold increase. The compounds LiFePO4, LiNiCoMnO2, LiNiCoAlO2, and LiMn2O4 are commonly used as the cathode active materia
Data Loading...
