磷酸铁锂
煅烧
材料科学
复合数
化学工程
结晶度
锂(药物)
纳米颗粒
磷酸铁
碳纤维
降水
微晶
磷酸盐
纳米技术
电极
电化学
复合材料
化学
冶金
催化作用
有机化学
医学
物理
物理化学
气象学
工程类
内分泌学
作者
Chien‐Te Hsieh,I‐Ling Chen,Wei-Yu Chen,Jung-Pin Wang
标识
DOI:10.1016/j.electacta.2012.07.108
摘要
Carbon-coated lithium iron phosphate (C/LFP) composite has been synthesized at 650 °C in an N2 atmosphere by calcination/pyrolysis method using amorphous FePO4·xH2O nanopowders as the precursor. The key factor for preparing the C/LFP composites is to start with the co-precipitation synthesis of FePO4·xH2O spheres at pH 3. The C/LFP composite exhibits good crystallinity, well-dispersed particles of 250 nm, and in situ carbon coating (thickness: 3–4 nm) over the surface of LFP crystallites. The as-prepared C/LFP composite delivers a high discharge capacity of 162.1 and 119.7 mAh g−1 at rates of 0.1 and 5 C, respectively. This enhanced rate capability is ascribed to the synergetic effect on the C/LFP cathode that combines (i) quasi-spherical nanoparticles and (ii) a thin carbon layer. Additionally, the C/LFP composite presents a high tap density (1.34 g cm−3), inducing high performance without sacrificing the volume energy density. Accordingly, the result reveals an efficient approach for synthesizing the C/LFP materials with excellent performance, which is beneficial for large-scale applications such as hybrid electric vehicles.
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