1. Morphology-controlled synthesis of self-assembled LiFePO4/C/RGO for high-performance Li-ion batteries
- Author
-
Mei Lin, Jikang Yuan, Yuming Chen, Wei Lu, Kifung Kam, Bolei Chen, Helen Lai Wa Chan, and Xiao Wu
- Subjects
Materials science ,Graphene ,Oxide ,chemistry.chemical_element ,Nanotechnology ,Polyethylene glycol ,engineering.material ,Electrochemistry ,Hydrothermal circulation ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Coating ,law ,PEG ratio ,engineering ,General Materials Science ,Carbon - Abstract
Novel architectured LiFePO4 (LFP) that consisted of ordered LFP nanocubes was prepared through a facile hydrothermal method using polyethylene glycol (PEG) as a surfactant. The micro/nanostructured LFP with various morphologies ranging from cube cluster to rugby-like structure was synthesized via controlling the pH values of the precursor. A reasonable assembly process elucidating the formation of the hierarchical structure is also provided based on the experimental results. After a combination of carbon (C) coating and reduced graphene oxide (RGO) wrapping, the obtained LFP/C/RGO composites exhibit enhanced electrochemical performance compared to that of blank LFP synthesized under the same condition. Among as-synthesized cube-cluster-like, dumbbell-like, rod-like, and rugby-like composites, the rugby-like LFP/C/RGO reveal the best electrochemical properties with the discharge specific capacity of ∼150 mA h g(-1) after 100 cycles and a high reversible specific capacity of 152 mA h g(-1) at 0.1 C. The prepared LFP/C/RGO composite can be a promising cathode material for high energy, low cost, and environmentally friendly lithium-ion batteries.
- Published
- 2014