Morphology-Controlled Synthesis of Self-Assembled LiFePO4/C/RGO for High-Performance Li-Ion Batteries
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- 作者：Mei Lin ; Yuming Chen ; Bolei Chen ; Xiao Wu ; Kifung Kam ; Wei Lu ; Helen Lai Wa Chan ; Jikang Yuan
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：October 22, 2014
- 年：2014
- 卷：6
- 期：20
- 页码：17556-17563
- 全文大小：554K
- ISSN：1944-8252
文摘
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 鈭?50 mA h g鈥? after 100 cycles and a high reversible specific capacity of 152 mA h g鈥? 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.