Effect of Li on electrochemical properties of Ti1.4V0.6Ni quasicrystal alloy produced by rapid quenching |
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| Affiliation: | 1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China;2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun 130022, China;1. Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, Henan Province, PR China;2. Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng 475004, Henan Province, PR China;1. Foundry Technology Division, Vikram Sarabhai Space Centre, Trivandrum 695022, India;2. Department of Materials, Indian Institute of Science, Bangalore 560012, India;3. Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia;1. Institute of Energy Conversion, University of Delaware, 451 Wyoming Rd, Newark, DE, 19716, USA;2. Department of Materials Science and Engineering, University of Delaware, 201 Dupont Hall, Newark, DE, 19716, USA;1. Department of Mechatronics Engineering, National Changhua University of Education, Changhua, Taiwan;2. Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan |
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| Abstract: | The effect of Li on the electrochemical performance of electrodes consisting of Ti1.4V0.6Ni quasicrystal was investigated at room temperature in three-electrode cell set-up. The quasicrystal sample was initially synthesized by arc melting, followed by melt-spinning, and then infiltrated with Li atoms by electroosmosis. According to X-ray diffraction, all ribbon samples were determined to be icosahedral quasicrystal phase (I-phase), V-based solid solution phase with BCC structure and face centered cubic (FCC) phase with Ti2Ni-type structure. After infiltrating some Li atoms into the Ti1.4V0.6Ni quasicrystal lattice under the condition of an electroosmosis current of 0.6 A, we could observe the appearance of Li diffraction peaks. Importantly, the slight shift to the left observed in the diffraction peaks indicated that lattice expansion was caused by the infiltration of Li. The discharge capacity of Ti1.4V0.6Ni–Li material was higher than that of Ti1.4V0.6Ni.The maximum discharge capacity of 307.1 mAh/g was recorded for Ti1.4V0.6Ni–Li at a current density of 30 mAh/g. Both high-rate dischargeability and cycling stability were enhanced as a result of infiltrating Li. The lithium could get into the lattice, which resulted in the formation of microspores on surface of alloy, thus improving electrochemical activity of the alloy electrode. At the same time, the electrochemical reaction kinetics of alloy electrodes was also researched. |
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| Keywords: | B Electrochemistry B Hydrogen storage C Rapid solidification F Electrochemical characterization |
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