【摘要】 在预炭化硬炭前驱体酚醛环氧树脂中掺入硼酸制备含硼原子的锂离子电池硬炭基负极材料.通过X射线衍射仪分析、扫描电子显微镜等对材料的微观结构进行表征,采用氮气吸脱附法测定材料的孔特性和比表面积,利用循环伏安、交流阻抗以及恒电流充放电实验研究材料的电化学性能.结果表明:随着硼酸掺入量的增加,硬炭的层间距、比表面积、孔体积和首次不可逆比容量变小,首次库伦效率提高,硼酸掺入质量分数为10%时,硬炭可逆比容量从332.2mAh·g^-1增长到461.1mAh·g^-1,对应的固体电解质中间相膜的电阻从33.86Ω减少为24.53Ω.更多还原

【Abstract】 Hard carbon anode containing boron atoms for lithium ion batteries was synthesized by adding boric acid in the pre-carbonized precursor of phenolic epocy resin.The micro-structures of materials were characterized by X-ray diffraction,scanning electron microscope and other technical means.The pore characteristics and specific surface areas were determined in nitrogen absorption method.The electrochemical performance of anode was analyzed by cyclic voltammetry,electrochemical impedance spectra and galvanostatic charge and discharge experiments.The results show that the layer distances,specific surface area,pore volume and initial irreversible specific capacities decrease and the initial coulombic efficiency increases with the increase of the content of boric acid.The reversible capacity increases from 332.2mAh·g^-1 to 461.1mAh·g^-1 and the corresponding resistance of solid inter-phase film decreases from 33.86Ωto 24.53Ω when the doping content of boric acid reaches 10%.更多还原