Coaxial silicon/multi-walled carbon nanotube nanocomposite anodes for long cycle life lithium-ion batteries

Tocoglu, U.; Cevher, O.; Guler, Mehmet Oguz; Akbulut, Hatem

doi:10.1016/j.apsusc.2014.03.101

Cited by 21 publications

(6 citation statements)

References 35 publications

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“…The weights of the buckypaper before and after heat treatment were measured using an analytical balance. The buckypaper lost approximately 13% of its total weight after heat treatment because of a 5% loss associated with the evaporation of water absorbed from the walls of the CNT at temperatures of 180 °C, whereas the remaining weight loss corresponded to the elimination of hydroxyl groups and the oxidation of amorphous carbon and impurities at 400–500 °C [ 18 , 19 ]. The electrical conductivities of UBP and HBP were measured using the four-probe technique.…”

Section: Resultsmentioning

confidence: 99%

“…For the HSi_HBP electrodes, the capacity was maintained for 100 cycles, which delivered high capacities of 193/192 μAh at the 100th cycle, and superior cycling stability, with 99.5% capacity retention after 100 cycles. The wide electrode expansion of Si was relieved, and the two electrodes showed excellent electrochemical performance, indicating that the unique surface properties of the MWCNTs can easily buffer the stress arising from volume increment [ 19 ]. The two electrodes demonstrated extremely high capacity, indicating that the heat treatment of buckypaper can triple the capacity ( Figure 7 ).…”

Section: Resultsmentioning

confidence: 99%

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High Electrochemical Performance Silicon Thin-Film Free-Standing Electrodes Based on Buckypaper for Flexible Lithium-Ion Batteries

et al. 2021

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Recently, applications for lithium-ion batteries (LIBs) have expanded to include electric vehicles and electric energy storage systems, extending beyond power sources for portable electronic devices. The power sources of these flexible electronic devices require the creation of thin, light, and flexible power supply devices such as flexile electrolytes/insulators, electrode materials, current collectors, and batteries that play an important role in packaging. Demand will require the progress of modern electrode materials with high capacity, rate capability, cycle stability, electrical conductivity, and mechanical flexibility for the time to come. The integration of high electrical conductivity and flexible buckypaper (oxidized Multi-walled carbon nanotubes (MWCNTs) film) and high theoretical capacity silicon materials are effective for obtaining superior high-energy-density and flexible electrode materials. Therefore, this study focuses on improving the high-capacity, capability-cycling stability of the thin-film Si buckypaper free-standing electrodes for lightweight and flexible energy-supply devices. First, buckypaper (oxidized MWCNTs) was prepared by assembling a free stand-alone electrode, and electrical conductivity tests confirmed that the buckypaper has sufficient electrical conductivity (10−4(S m−1) in LIBs) to operate simultaneously with a current collector. Subsequently, silicon was deposited on the buckypaper via magnetron sputtering. Next, the thin-film Si buckypaper freestanding electrodes were heat-treated at 600 °C in a vacuum, which improved their electrochemical performance significantly. Electrochemical results demonstrated that the electrode capacity can be increased by 27/26 and 95/93 μAh in unheated and heated buckypaper current collectors, respectively. The measured discharge/charge capacities of the USi_HBP electrode were 108/106 μAh after 100 cycles, corresponding to a Coulombic efficiency of 98.1%, whereas the HSi_HBP electrode indicated a discharge/charge capacity of 193/192 μAh at the 100th cycle, corresponding to a capacity retention of 99.5%. In particular, the HSi_HBP electrode can decrease the capacity by less than 1.5% compared with the value of the first cycle after 100 cycles, demonstrating excellent electrochemical stability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High Electrochemical Performance Silicon Thin-Film Free-Standing Electrodes Based on Buckypaper for Flexible Lithium-Ion Batteries

et al. 2021

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“…Bunun yanı sıra, partikül hasarları ve tozlaşmaları yeni elektrot/elektrolit ara yüzeylerinin oluşmasına neden olarak yeni pasivasyon tabakalarının oluşmasına ve buna bağlı olarak ise Rct değerinin artışına neden olmaktadır [23]. Oluşan pasivasyon tabakalarının kararlı olması halinde pasivasyon tabakasının daha da büyümesi ya da elektrolitin sürekli olarak bozulmasının da önüne geçilebilir [24]. Bu çalışmada SnO ve SnO/C anot elektrotlarının şarj transfer dirençleri (Rct) sırasıyla 887 ohm ve 306 ohm olarak bulunmuştur.…”

Section: Sonuçlar Ve Tartişma (Results and Discussion)unclassified

Lityum iyon piller için kalay (II) oksit kompozit anot elektrotlarının üretimi ve karakterizasyonu

Guler¹

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

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ÖZBu çalışmada Li-iyon piller için uyumlu çekirdek olarak kalay (II) oksit anotlar kimyasal indirgeme yöntemi ile sentezlenmiştir. Karbon esaslı kabuk sentezi için mikrodalga destekli karbürizasyon yöntemi kullanılmış ve SnO tozlarının yüzeylerinde ince amorf bir karbon tabakası elde edilmiştir. Üretilen kalay (II) oksit/karbon kompozit elektrotların yüzey morfolojileri Taramalı Elektron Mikroskobu (SEM) ile analiz edilmiş ve yapıların faz bileşenleri X-Işınları Difraktometresi (XRD) ile karakterize edilmiştir. Üretilen kalay (II) oksit/karbon kompozit tozları kullanılarak hazırlanan elektrotlar ile CR2016 test hücreleri hazırlanmış ve elektrotların elektrokimyasal performansı MTI BST8-MA 8 kanallı pil test ünitesinde, oda sıcaklığında 10 mV ve 2,5 V arasında sabit 1C şarj/deşarj şartlarında akım verilerek test edilmiştir. Sonuç olarak, kalay (II) oksit/karbon kompozit elektrot malzemeleri ile 100 çevrim sonrasında 396 mAh g -1 deşarj kapasitesi elde edilmiştir.Anahtar Kelimeler: Kalay (II) oksit, çekirdek/kabuk, kimyasal indirgeme, mikrodalga destekli karbürizasyon, Li iyon pil. The Production and characterization of tin (II) oxide composite anode electrodes for lithium ion batteries ABSTRACTIn this study, the core component of the composite, tin (II) oxide powders synthesized through a facile chemical reduction methods for Li-ion batteries. As the shell structure, surfaces of the as-synthesized tin (II) oxide particles were coated with carbon through microwave assisted carburization process. The surface morphologies and phase components of the as-synthesized tin (II) oxide/carbon composites were investigated via scanning electron microscopy and X-ray diffraction methods, respectively. CR2016 type coin cells were prepared by using tin (II) oxide/carbon composite powders and electrochemical tests were performed at room temperature via 8-channel MTI BST8-MA electrochemical test station between 10 mV and 2.5 V potential range by applying fixed 1 C state of charge conditions. The results have shown that tin (II) oxide/carbon composite structure have significantly improved the specific capacities to 396 mAh g-1 after 100 cycles. sea takimata sanctus est Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam * nonumy eirmod tempor invidunt ut lab ore sit et dolore magna

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“…The band observed around 630 cm À1 corresponds to the 2LA (longitudinal acoustic) second order phonon Raman scattering and TO (transverse optic) + TA (transverse acoustic) overtone of amorphous Si vibration modes. 23,40,41 The Raman spectrum of TiO 2 @Si NRs (Fig. 3b) shows the characteristic peaks of TiO 2 that centered at 236, 448 and 609 cm À1 .…”

Section: Resultsmentioning

confidence: 99%

Stabilized titanium nitride nanowire supported silicon core–shell nanorods as high capacity lithium-ion anodes

et al. 2015

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Coaxial silicon/multi-walled carbon nanotube nanocomposite anodes for long cycle life lithium-ion batteries

Cited by 21 publications

References 35 publications

High Electrochemical Performance Silicon Thin-Film Free-Standing Electrodes Based on Buckypaper for Flexible Lithium-Ion Batteries

High Electrochemical Performance Silicon Thin-Film Free-Standing Electrodes Based on Buckypaper for Flexible Lithium-Ion Batteries

Lityum iyon piller için kalay (II) oksit kompozit anot elektrotlarının üretimi ve karakterizasyonu

Stabilized titanium nitride nanowire supported silicon core–shell nanorods as high capacity lithium-ion anodes

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