Ti-Fe-Si/C composites as anode materials for high energy li-ion batteries. Issue 2 (15th June 2022)

• Record Type: Journal Article
• Authors: Nuhu, Bage Alhamdu; Adun, Humphrey; Bamisile, Olusola; Mukhtar, Mustapha
• Is Part Of: Energy sources. Volume 44:Issue 2(2022)
• Page Start: 5154
• Page End: 5171
• Publication Date: 2022-06-15
• Subjects: Ti-Fe-Si/C -- Li-ion batteries -- ball milling -- anode -- capacity -- discharge -- charge; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2022.2081742
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: In this study, Ti-Fe-Si composites were prepared by one step ball-milling method as anode materials for Li-ion batteries. The effects of ball-milling speed and time were studied by X-ray diffraction, electron microscopy, and 57 Fe Mössbauer spectroscopy. Changes in the composition and microstructure of the composites were observed and related to the electrochemical performance. Increasing ball-milling speed led to the formation of FeSix alloys that reduced the specific capacity while increasing the ball-milling time improved the particle size morphology and homogeneity. Discharge/charge profiles for the first two cycles were carried out at 0.05C current rate (1C = 1260 mAh.g −1 for Li3.75 Si). The first discharge for Ti-Fe-Si showed a Lix Si reaction plateau of 1100 mAh.g −1, which were reversible and yielded columbic efficiency (CE) 77% and 90% in the first and second cycles, respectively. This capacity plateau indicated the insertion of about 3.25 Li into silicon. For the composite containing an additional 10% carbon SP, the theoretical capacity was about 1130 mAh.g −1, the discharge curve showed that the first discharge plateau reaches 1030 mAh.g −1 corresponding to 3.5 Li with the first CE was about 85%, and 98% for the second cycle. The addition of carbon to Ti-Fe-Si-C played a key role in capacity retention. The best results were obtained for the composite Fe/Ti/Si (1:1:2) with 10 wt% of carbon, ball-milled at 500 rpm for 48 hours. The specific capacities were about 900 mAh.g −1 at C/5 and 700 mAh.g −1 at 1C (C = 1200 mAg −1 ) with a capacity retention of about 90% for 100 cycles.