Nitrogen-doped-carbon coated lithium iron phosphate cathode material with high performance for lithium-ion batteries
Nitrogen-doped-carbon coated lithium iron phosphate cathode material with high performance for lithium-ion batteries
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氮掺杂碳包覆高性能锂离子电池磷酸铁锂正极材料
DOI：
10.1016/j.jallcom.2014.12.015
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发表时间：
2015
影响因子：
6.2
通讯作者：
Jun-chao Zheng
中科院分区：
文献类型：
--
作者：
Bao Zhang;Xin-bo Yuan;Hui Li;Xiao-wei Wang;Jia-feng Zhang;He-zhang Chen;Jun-chao Zheng
以含氮离子液体（IL）为氮源，采用简单高效的固态法制备了氮掺杂碳包覆lifepo4 （NC-LiFePO4）。采用透射电子显微镜（TEM）、x射线光电子能谱（XPS）和能谱仪（EDS）对颗粒表面均匀涂覆的n掺杂碳层进行了检测。颗粒表面的氮掺杂碳层可以提高LiFePO4的电子导电性，与未掺杂碳层（C-LiFePO4）相比，具有更高的容量和更优越的倍率性能。nc - lifepo4的比放电容量分别为160.1 mA h g−1at 0.1 C和124.5 mA h g−1at 10 C，而C- lifepo4的比放电容量分别为149.1 mA h g−1at 0.1 C和95.7 mA h g−1at 10 C。本文所报道的方法对提高lifepo4的电导率非常有效，并且可以很容易地应用于其他正极材料的合成。
LiFePO4coated with nitrogen-doped carbon (NC-LiFePO4) is successfully synthesized via a simple and efficient solid state method by using nitrogen-containing ionic liquid (IL) as nitrogen source. The uniformly coated N-doped carbon layers on the particles are examined by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDS). The nitrogen-doped carbon layers on the particle surface can increase the electronic conductivity of LiFePO4, resulting in higher capacity and more superior rate capability compared with the one coated with undoped carbon (C-LiFePO4). The specific discharge capacities of NC-LiFePO4are 160.1 mA h g−1at 0.1 C and as high as 124.5 mA h g−1at 10 C, while they are 149.1 mA h g−1at 0.1 C and 95.7 mA h g−1at 10 C for C-LiFePO4. The method reported in this paper is very effective in electronic conductivity improvement of LiFePO4and can be easily applied to the synthesis of other cathode materials.