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Yanshuang Meng,Zhong Zhang,Wangqing Han,Yue Zhang,Fuliang Zhu,Da-jian Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.1
A one-step microwave-assisted pyrolysis of ionic liquid process is developed to synthesize carbon-coated LiFePO4 by using the ionic liquid [BMIm]N(CN)2 as a carbon source. A thin layer of uniform and nanoscaled carbon film is formed on the LiFePO4 particles surface with a strong interface. The electrochemical properties of LiFePO4 are improved due to the carbon coating which increases the electronic conductivity of LiFePO4. The results indicate that the microwaveassisted pyrolysis of ionic liquid process is a rapid and efficient method to prepare carbon-coated LiFePO4 material and other carbon-coated electrode materials.
Meng, Yanshuang,Cheng, Yulong,Ke, Xinyou,Ren, Guofeng,Zhu, Fuliang The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
The inverse spinel Cobalt ferrite (CoFe<sub>2</sub>O<sub>4</sub>, CFO) is considered to be a promising alternative to commercial graphite anodes for lithium ion batteries (LIBs). However, the further development of CFO is limited by its unstable structure during battery cycling and low electrical conductivity. In an effort to address the challenge, we construct three-dimensional hierarchical flower-like CFO nanoclusters (CFO NCs)-decorated carbonized cotton carbon fiber (CFO NCs/CCF) composite. This structure is consisted of microfibers and nanoflower cluster composited of CFO nanoparticle, in which CCF can be used as a long-range conductive matrix, while flower-like CFO NCs can provide abundant active sites, large electrode/electrolyte interface, short lithium ion diffusion path, and alleviated structural stress. As anode materials in LIBs, the flower-like CFO NCs/CCF exhibits excellent electrochemical performance. After 100 cycles at a current density of 0.3 A g<sup>-1</sup>, the CFO NCs/CCF delivers a discharge/charge capacity of 1008/990 mAh g<sup>-1</sup>. Even at a high current density of 15 A g<sup>-1</sup>, it still maintains a charge/discharge capacity of 362/361 mAh g<sup>-1</sup>.