Rheological phase synthesis of Fe2P2O7/C composites as the precursor to fabricate high performance LiFePO4/C composites for lithium-ion batteries

• Published in: Ceramics international 2019-06, Vol.45 (9), p.12331-12336
• Main Authors: Xie, Xiaoming, Hu, Guorong, Cao, Yanbing, Du, Ke, Gan, Zhanggen, Xu, Lian, Wang, Yongzhi, Peng, Zhongdong
• Format: Article
• Language: English
• Subjects: Dynamic calcination; Electrochemical performance; Fe2P2O7; LiFePO4; Rheological phase method
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2019.03.149

In this paper, the micro-sized Fe2P2O7/C composites have been successfully prepared by rheological phase method using Fe2O3, H3PO4 and glucose as raw materials. Then, the prepared Fe2P2O7/C is used as a precursor to synthesize LiFePO4/C. The synthesis process of Fe2P2O7/C-dynamic composites is assisted by dynamic calcination. The corresponding LiFePO4/C-dynamic composites exhibit excellent physicochemical performance confirmed by XRD, SEM, TEM, CV, EIS, Elements detection and cyclic tests. The results indicate that the LiFePO4/C-dynamic sample is well-distributed in element level and possesses uniform monodisperse morphology. In addition, it delivers a discharge capacity of 157.1, 146.6, 138.0 and 130.2 mAh g−1 at the rate of 0.2, 1, 2 and 3 C, respectively. Meanwhile, it can retain 99.52% of the initial capacity after 300 cycles at 1 C, exhibiting an excellent cycling stability. The study reveals that the assisting method of dynamic calcination is highly efficient to synthesize Fe2P2O7/C materials with better performance, and eventually, fabricate high performance LiFePO4/C composites for lithium-ion batteries.