摘要
Carbon layers with microporous structures fine-modulated by naphthalene(NAP) were prepared to coat on LiFePO_4, aiming to enhance the Li+diffusion coefficient for Li-ion batteries. Characterized by BET, XRD, TEM, EIS, etc., it is indicated that in the presence of NAP, the carbon-coated LiFePO_4/C-NAP composites have the enlarged micropore size of 1.66 nm and the enhanced Li^+ diffusion coefficient of2.83 × 10^(-12)cm^2s^(-1), which is about five times higher than that of LiFePO4/C prepared in the absence of NAP. At a high rate of 20 C, the discharge capacity of the LiFePO_4/C-NAP is up to 120.1 mA h g^(-1) and maintains a good retention rate of 93.2% after 400 cycles. It is suggested that the NAP-modulated carbon coating is a promising route to accelerate the Li-ion diffusion rate and enhance the electrochemical performance for lithium ion batteries.
Carbon layers with microporous structures fine-modulated by naphthalene(NAP) were prepared to coat on LiFePO_4, aiming to enhance the Li+diffusion coefficient for Li-ion batteries. Characterized by BET, XRD, TEM, EIS, etc., it is indicated that in the presence of NAP, the carbon-coated LiFePO_4/C-NAP composites have the enlarged micropore size of 1.66 nm and the enhanced Li^+ diffusion coefficient of2.83 × 10^(-12)cm^2s^(-1), which is about five times higher than that of LiFePO4/C prepared in the absence of NAP. At a high rate of 20 C, the discharge capacity of the LiFePO_4/C-NAP is up to 120.1 mA h g^(-1) and maintains a good retention rate of 93.2% after 400 cycles. It is suggested that the NAP-modulated carbon coating is a promising route to accelerate the Li-ion diffusion rate and enhance the electrochemical performance for lithium ion batteries.
基金
financially supported by the National Natural Science Foundation of China(Nos.21476158,21621004)
Program for Changjiang Scholars and Innovative Research Team in University(No.IRT_15R46)
