Ma Zhipeng, Fan Yuqian, Shao Guangjie, Wang Guiling, Song Jianjun, Liu Tingting
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.
ACS Appl Mater Interfaces. 2015 Feb 4;7(4):2937-43. doi: 10.1021/am5084368. Epub 2015 Jan 22.
The low electronic conductivity and one-dimensional diffusion channel along the b axis for Li ions are two major obstacles to achieving high power density of LiFePO4 material. Coating carbon with excellent conductivity on the tailored LiFePO4 nanoparticles therefore plays an important role for efficient charge and mass transport within this material. We report here the in situ catalytic synthesis of high-graphitized carbon-coated LiFePO4 nanoplates with highly oriented (010) facets by introducing ferrocene as a catalyst during thermal treatment. The as-obtained material exhibits superior performances for Li-ion batteries at high rate (100 C) and low temperature (-20 °C), mainly because of fast electron transport through the graphitic carbon layer and efficient Li(+)-ion diffusion through the thin nanoplates.
锂离子在LiFePO₄材料中低电子电导率以及沿b轴的一维扩散通道是实现其高功率密度的两个主要障碍。因此，在定制的LiFePO₄纳米颗粒上包覆具有优异导电性的碳，对于该材料内部高效的电荷和质量传输起着重要作用。我们在此报告，通过在热处理过程中引入二茂铁作为催化剂，原位催化合成具有高度取向（010）晶面的高石墨化碳包覆LiFePO₄纳米片。所获得的材料在高倍率（100 C）和低温（-20 °C）下对锂离子电池表现出优异性能，这主要归因于通过石墨碳层的快速电子传输以及通过薄纳米片的高效Li⁺离子扩散。
