Citation: HUANG Jia-Jun, DONG Zhi-Jun, ZHANG Xu, YUAN Guan-Ming, CONG Ye, CUI Zheng-Wei, LI Xuan-Ke. Effects of Structure on Electrochemical Performances of Ribbon-Shaped Mesophase Pitch-Based Graphite Fibers[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1699-1707. doi: 10.3866/PKU.WHXB201604011
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Ribbon-shaped mesophase pitch-based graphite fibers (MPGFs) were prepared by melt-spinning, preoxidation, carbonization, and graphitization. The effects of the size of the spinneret and spinning rate on the orientation of the carbon layers and crystal structure of the ribbon-shaped graphite fibers transverse section were investigated. The electrochemical performances of the ribbon-shaped MPGFs as anode materials for lithium-ion batteries were tested. The results show that the size of the spinneret and spinning rate significantly affect the orientation of the carbon layers. The carbon layers of graphite fibers that were prepared at a low spinning rate using a spinneret with a low length/width ratio were arranged along the radial direction. These fibers had good rate capability. Their discharge specific capacities at 0.1C and 1C rates were 336 and 300 mAh·g-1, respectively. However, the fibers showed poor cyclic performance. After 100 cycles at 0.1C rate, the capacity retention was only 89.1%. The carbon layers of the graphite fibers that were prepared at a low spinning rate using a spinneret with a high length/width ratio had a wavy, wrinkled texture and were arranged along the direction parallel to the principal plane of the fibers. These fibers had poor rate capability and excellent cyclic performance. After 100 cycles at 0.1C rate, the capacity retention was 98.8%. Meanwhile, an increase in the spinning rate causes an overall decrease in the order degree of the carbon layers of the graphite fibers, and results in a decrease of the carbon layers being arranged along the direction parallel to the principal plane of the fibers. Both these factors decrease the reversible specific capacity.
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