Carbon-coated LiFePO4–porous carbon composites as cathode materials for lithium ion batteries

Abstract

This work introduces a facile strategy for the synthesis of carbon-coated LiFePO(4)-porous carbon (C-LiFePO(4)-PC) composites as a cathode material for lithium ion batteries. The LiFePO(4) particles obtained are about 200 nm in size and homogeneously dispersed in porous carbon matrix. These particles are further coated with the carbon layers pyrolyzed from sucrose. The C-LiFePO(4)-PC composites display a high initial discharge capacity of 152.3 mA h g(-1) at 0.1 C, good cycling stability, as well as excellent rate capability (112 mA h g(-1) at 5 C). The likely contributing factors to the excellent electrochemical performance of the C-LiFePO(4)-PC composites could be related to the combined effects of enhancement of conductivity by the porous carbon matrix and the carbon coating layers. It is believed that further carbon coating is a facile and effective way to improve the electrochemical performance of LiFePO(4)-PC.

Preparation and electrochemical performance of LiFePO4/C microspheres by a facile and novel co-precipitation

“…83-2092). There is no evidence of diffraction peaks from carbon, which indicates that the carbon pyrolyzed from PVA is amorphous and has no effect on the crystal structure of LiFePO 4 [30]. TG measurement was carried out to estimate the carbon content in the LiFePO 4 /C microspheres.…”

Triple carbon coated LiFePO4 composite with hierarchical conductive architecture as high-performance cathode for Li-ion batteries

“…Fortunately, carbon coating substantially promotes electrochemical properties of LiFePO 4 material by controlling crystallite size and forming thin, tightly attached, and uniform carbon layers [10,13,14]. The conductive carbon layer well coated on particle surfaces can improve the electronic conductivity of LiFePO 4 , and the particle size minimization is an effective way to decrease the diffusion distance for charge transfer, which can overcome the low Li-ion diffusion rate [15].…”

LiFePO4/carbon nanowires with 3D nano-network structure as potential high performance cathode for lithium ion batteries

“…83-2092). There is no evidence of diffraction peaks from carbon, which indicates that the carbon pyrolyzed from amyloses is amorphous and has no effect on the crystal structure of LiFePO4 [20]. TG measurement was carried out to estimate the carbon content in the LiFePO4/C nanowires.…”