磷修饰炭黑的制备及其储锂性能

Study on preparation and Li storage property of organophosphorus-modified carbon black

鉴于碳材料容量低、循环稳定差,提出了利用有机-无机杂化的概念来制备碳基复合材料,并将其用做锂离子电池负极材料。首先以亚磷酸三乙酯为原料制备磷酰氯,然后借助炭黑表面的羟基与羧基进行接枝反应,制备出有机磷修饰炭黑原料,并利用红外光谱、氮气吸脱附测试对材料进行了表面官能团及结构表征,利用恒流充放电与循环伏安测试对其储锂性能和动力学特性进行了表征。结果表明:有机磷官能团修饰到炭黑表面,与原料炭黑相比,磷修饰炭黑的首圈可逆容量由301mAh/g提升至950mAh/g,首圈库仑效率由54%提升至80%,动力学分析表明,有机磷官能团的引入明显增强了电极材料储锂过程中的电容特性。

In view of the low capacity and poor cyclic stability of carbon materials,the strategy of organicinorganic hybridization is developed to produce carbon-based composite materials for the anode of Li-ion batteries(LIBs).The organophosphorus modifications on the surface of carbon black were successfully performed.The structures of organophosphorus groups on the surface were verified by FT-IR measurements.The Li storage capacity and kinetic properties were characterized by the galvanostaic charge/discharge and cyclic voltammetry tests.Compared with raw carbon black(CB),the initial capacity was enhanced from 301mAh/g to 950mAh/g,and the coulombic efficiency was increased from 54%to 80%.Kinetics analysis revealed that the Li+storage was capacitive dominating process via introducing organophosphorus functional groups on the surface of CB.