The influence of different Si : C ratios on the electrochemical performance of silicon/carbon layered film anodes for lithium-ion batteries

Wang, Jun; Li, Shengli; Zhao, Yi; Shi, Juan; Lv, Lili; Wang, Huazhi; Zhang, Zhiya; Feng, Wangjun

doi:10.1039/c7ra12027c

Cited by 45 publications

(40 citation statements)

References 59 publications

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“…However, the discharge capacity degrades rapidly down to 70.2 mA h cm À2 aer 150 cycles, indicating only 53.5% ) and optimal capacity retention of 80% aer 150 cycles compared to other electrodes. Among all the materials, a-Si/Ag as the anode material shows the worst cycling performance, which indicates that the silver thin lm deposited on the copper foil cannot increase the adhesion of silicon to the substrates such as Ti 22,23,42 and Cr. [43][44][45] The CE values aer 150 cycles are 98.3%, 95.2%, 99.5% and 99.1% for the electrodes of a-Si, Ag/a-Si, a-Si/Ag/a-Si, and a-Si/Ag, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…), or using modied collectors. [17][18][19][20] Silicon-based multilayer electrodes, such as Si-C, [21][22][23] Si-Ge, 24 Si-Cr, 25 Si-Co, 26 or Si-Al 27 , can effectively relieve stress caused by volume changes as well as provide a short pathway for Li + diffusion and electron transportation. 28 In addition, they also display increased electronic conductivity compared to pure silicon.…”

Section: Introductionmentioning

confidence: 99%

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Improved performances of lithium-ion batteries using intercalated a-Si–Ag thin film layers as electrodes

et al. 2018

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved performances of lithium-ion batteries using intercalated a-Si–Ag thin film layers as electrodes

et al. 2018

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“…The thickness of the deposited Si was 0.369 µm, while the deposition time of the sputtering process was 15 min. The amount of the deposited Si was calculated using the formula m = ρsd, where s and d represent the thickness and area of the electrode, respectively, and ρ is the density of the active material, which was assumed to be the theoretical density (of 2.26 ± 0.1 g cm −3 ) for amorphous silicon [16,17]. The weights of the buckypaper before and after heat treatment were measured using an analytical balance.…”

Section: Characterization Of Electrodesmentioning

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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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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“…Silicon has the large storage capacity compared to other material, 4200 mAh/g [13], [14]. Silicon is relatively unaffordable, safe, and has a relatively low disposal potential (≈0.37 V vs Li + / Li); [15].…”

Section: Introductionmentioning

confidence: 99%

Silicon preparation derived from geothermal silica by reduction using magnesium

Silviana¹

2020

IJETER

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Geothermal silica denotes as a potential source of silica due to high content of silica. Silica can be converted to be silicon through magnesiothermal reduction. The objectives of paper are to obtain the optimum ratio of Mg to SiO 2 , and to obtain acetic acid concentration in the second leaching of the silicon. At beginning, purification of geothermal silica was carried out through acid leaching by 20% of hydrosulfuric acid (H 2 SO 4 ) with silica content of 96.3 wt%. Silicon conversion had been performed used magnesiothermic reduction at 650 oC for 7 hours. The mole ratio of Mg to SiO 2 used 1.6:1, 2:1, and 2.5:1. The acid leaching process used HCl (3 N) at 60 o C for 1 hour and utilized HFof (5 N) with varied acetic acid concentration for 1 hour at 70 o C (25, 35, 45, 50, and 60 % ww). Afterward, the results were confirmed by characterization of the silicon with XRF analsys. Silicon yield was achieved at 77.1 wt% with 91.4 wt% of purity at first acid leaching. This results have been generated by use of Mg to SiO 2 ratio at 2:1 and leached out by HCl 3 N. However, at second acid leaching with HF-acetic acid mixture released the purity of silicon at 93.9 wt%. Silicon from geothermal silica can replace the use of graphite as anodes of lithium ion batteries.

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The influence of different Si : C ratios on the electrochemical performance of silicon/carbon layered film anodes for lithium-ion batteries

Abstract: With a high specific capacity (4200 mA h g−1), silicon based materials have become the most promising anode materials in lithium-ions batteries.

Cited by 45 publications

References 59 publications

Improved performances of lithium-ion batteries using intercalated a-Si–Ag thin film layers as electrodes

Improved performances of lithium-ion batteries using intercalated a-Si–Ag thin film layers as electrodes

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

Silicon preparation derived from geothermal silica by reduction using magnesium

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