Liu Yi-Hung, Lin Heng-Han, Tsai Tsung-Yu, Hsu Chun-Han
Department of Chemical and Materials Engineering, National Central University No. 300, Zhongda Road, Zhongli District Taoyuan 32001 Taiwan
General Education Center, National Tainan Junior College of Nursing 78, Sec. 2, Minzu Rd. Tainan 700 Taiwan
RSC Adv. 2019 Oct 16;9(57):33117-33123. doi: 10.1039/c9ra05876a. eCollection 2019 Oct 15.
A binder-free self-standing carbon nanotube (CNT)/carbon fiber (CF) composite electrode, which has been developed using an electrophoretic deposition approach, was utilized as a lithium-ion battery anode. The morphology of the CNT/CF composite has been examined using scanning electron microscopy, and the results indicated that a CNT layer uniformly deposited on the CFs. The thickness and density of the CNT layer increased as the electrodeposition time increased, while overdeposition caused the CNT layer to exfoliate. Electrochemical evaluation revealed that the specific capacity, cycling stability, and rate capability of the CNT/CF anode were superior to those of the CF anode. The electrochemical impedance analysis results further revealed that the solid/electrolyte interface resistance and interface resistance induced by the oxygen-containing surface functional groups of CFs dominated the impedance of the anode. However, these resistance values could be potentially reduced CNT surface modification, which could lead to the enhanced electrochemical performance of the CNT/CF anode. Our findings should open new avenues for the potential use of the CNT/CF composite as a self-standing anode for lithium-ion battery applications.
一种采用电泳沉积法制备的无粘结剂自支撑碳纳米管（CNT）/碳纤维（CF）复合电极被用作锂离子电池阳极。利用扫描电子显微镜对CNT/CF复合材料的形貌进行了研究，结果表明CNT层均匀地沉积在CFs上。随着电沉积时间的增加，CNT层的厚度和密度增加，而过度沉积会导致CNT层剥落。电化学评估表明，CNT/CF阳极的比容量、循环稳定性和倍率性能优于CF阳极。电化学阻抗分析结果进一步表明，CFs含氧化合物表面官能团引起的固体/电解质界面电阻和界面电阻主导了阳极的阻抗。然而，通过CNT表面改性可能会降低这些电阻值，这可能会导致CNT/CF阳极的电化学性能增强。我们的研究结果应为CNT/CF复合材料作为锂离子电池应用的自支撑阳极的潜在应用开辟新途径。
