Co-coating effect of GdPO4 and carbon on LiFePO4 cathode surface for lithium ion batteries

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Vol. 30; no. 8; pp. 1442 - 1449
• Main Authors: Li, Yong, Wang, Juan, Huang, HuiXing, Wang, Jia, Zhang, Mi, Liang, MMeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2019
• Subjects: GdPO4 and carbon; Ionic and electronic conductivity; Lithium iron phosphate; Particle size and dispersibility; Lithium iron phosphate; Ionic and electronic conductivity; Particle size and dispersibility; GdPO4 and carbon
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2019.04.017

Schematic diagram for preparation procedure of LiFePO4/C&xGdPO4 products. [Display omitted] •LiFePO4 is co-coated with novel GdPO4 and carbon.•Enhancing simultaneously the ion and electronic conductivity of LiFePO4.•The co-coating improved the particle dispersibility and controlled particle size.•The LiFePO4/C&0.03GdPO4 performed best. The electronic conductivity enhanced has been extensively studied and reported in lithium iron phosph-ate (LiFePO4). However, only few existing literatures are available for researchers to enhance simultaneously the ion and electronic conductivity of LiFePO4. Herein, we disclose that the LiFePO4 is co-coated with novel GdPO4 and Carbon via a hydrothermal-assisted solid-phase method, contributing to particle size and dispersibility. What surprising is that the ionic and electronic conductivity of the material is significantly enhanced, and the interfacial side reaction is effectively inhibited between the materials and the electrolytes. The diverse proportions of the mixed coating (LiFePO4/C&xGdPO4 (x = 0, 1 wt%, 2 wt%, 3 wt%, 4 wt%)) are synthesized compared with bare LiFePO4. The experimental results suggest that LiFePO4/C&0.03GdPO4 exhibits the most excellent electrochemical performance. There is discharge capacity of 158, 148.8, 141.6, 134.9, 121.8, 104.9, and 86.7mAh/g at 0.1, 0.2, 0.5, 1, 2, 5, and 10 C rates, respectively.