Nano-sized LiFePO4/C composite with core-shell structure as cathode material for lithium ion battery. (10th September 2015)

• Record Type: Journal Article
• Authors: Liu, Yang; Zhang, Min; Li, Ying; Hu, Yemin; Zhu, Mingyuan; Jin, Hongming; Li, Wenxian
• Is Part Of: Electrochimica acta. Volume 176(2015)
• Page Start: 689
• Page End: 693
• Publication Date: 2015-09-10
• Subjects: LiFePO4 -- Core-shell microstructure -- Large surface area -- Perfect capacity -- Lithium ion battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.07.064
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Nano-sized LiFePO4/C composite with core-shell structure was fabricated via a well-designed approach as cathode material forlithium ion battery. The nano-sized LiFePO4/C composite with whole carbon shell coating layer showed an excellent electrical performance. Abstract: Nano-sized composite with LiFePO4 -core and carbon-shell was synthesized via a facile route followed by heat treatment at 650 °C. X-ray diffraction (XRD) shows that the core is well crystallized LiFePO4 . The electron microscopy (SEM and TEM) observations show that the core-shell structured LiFePO4 /C composite coating with whole carbon shell layer of ∼2.8 nm, possesses a specific surface area of 51 m 2 g −1 . As cathode material for lithium ion battery, the core-shell LiFePO4 /C composite exhibits high initial capacity of 161 mAh g −1 at 0.1 C, excellent high-rate discharge capacity of 135 mAh g −1 at 5 C and perfect cycling retention of 99.6% at 100 th cycle. All these promising results should be contributed to the core-shell nanostructure which prevents collapse of the particle structure in the long-term charge and discharge cycles, as well as the large surface area of the nano-sized LiFePO4 /C composite which enhances the electronic conductivity and shortens the distance of lithium ion diffusion.