A low temperature MgH2-AlCl3-SiO2 system to synthesize nano-silicon for high-performance Li-ion batteries

Yu, Jiage; Wang, Kun; Song, Wenlong; Huang, Hui; Liang, Chao; Xia, Yang; Zhang, Jun; Gan, Yongping; Wang, Feng; Zhang, Wenkui

doi:10.1016/j.cej.2020.126805

Cited by 20 publications

(10 citation statements)

References 33 publications

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“…This deleterious volume change stimulated the development of Si nanomaterials, because Si at the nano scale can withstand swelling without fracture during LiB cycling. This has been demonstrated for a variety of morphologies including Si nanoparticles (SiNP) [ 6 , 7 , 8 , 9 , 10 , 11 ], Si nanowires (SiNW) [ 3 , 12 , 13 , 14 ], Si nanotubes [ 15 , 16 ], and Si porous nanomaterials [ 17 , 18 , 19 ]. However, nanostructuration can be a costly process that needs to be carefully optimized for a dedicated application.…”

Section: Introductionmentioning

confidence: 99%

“…A critical diameter was also predicted by a mechanical numerical model [ 23 ] at 90 nm for SiNPs and 70 nm for SiNWs. By contrast, several electrochemical studies in LiB investigated the impact of particle size on Si-based anode cycling for small [ 6 , 8 ] and large [ 7 , 8 , 9 ] SiNPs, with the best results at diameters of 20–50 nm. As for SiNWs, some studies have suggested the optimal diameter as being around 30 nm [ 10 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

et al. 2021

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Silicon is a promising material for high-energy anode materials for the next generation of lithium-ion batteries. The gain in specific capacity depends highly on the quality of the Si dispersion and on the size and shape of the nano-silicon. The aim of this study is to investigate the impact of the size/shape of Si on the electrochemical performance of conventional Li-ion batteries. The scalable synthesis processes of both nanoparticles and nanowires in the 10–100 nm size range are discussed. In cycling lithium batteries, the initial specific capacity is significantly higher for nanoparticles than for nanowires. We demonstrate a linear correlation of the first Coulombic efficiency with the specific area of the Si materials. In long-term cycling tests, the electrochemical performance of the nanoparticles fades faster due to an increased internal resistance, whereas the smallest nanowires show an impressive cycling stability. Finally, the reversibility of the electrochemical processes is found to be highly dependent on the size/shape of the Si particles and its impact on lithiation depth, formation of crystalline Li15Si4 in cycling, and Li transport pathways.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

et al. 2021

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“…Silicon oxycarbide (SiOC, SiOn C4-n (0 ≤ n ≤ 4)) has been developed for anode material through the introduction of PSS-Octakis (dimethylsilyloxy) silsesquioxane (POSS) into A MgH 2 -AlCl 3 -SiO 2 melt system was developed to synthesize nano-Si through the reduction of SiO 2 by MgH 2 into molten AlCl 3 . The obtained nano-Si product shows an average particle size of 22.4 nm and exhibits a superior electrochemical storage capacity of 1185 mAh•g −1 over 300 cycles at 0.2 A•g −1 and a low thickness variation of 14.5% at 2 A•g −1 over 500 cycles, as shown in Figure 4b-d [81].…”

Section: Silicon-based Anode Materialsmentioning

confidence: 93%

“…A MgH2-AlCl3-SiO2 melt system was developed to synthesize nano-Si through the reduction of SiO2 by MgH2 into molten AlCl3. The obtained nano-Si product shows an average particle size of 22.4 nm and exhibits a superior electrochemical storage capacity of 1185 mAh•g −1 over 300 cycles at 0.2 A•g −1 and a low thickness variation of 14.5% at 2 A•g −1 over 500 cycles, as shown in Figure 4b-d [81]; and (e) Rate capability of the different silicon oxycarbide (SiOC) samples measured at various C-rates from 180 to 3600 mA•g −1 [82].…”

Section: Silicon-based Anode Materialsmentioning

confidence: 95%

“…Figure 4. (a) Schematic illustration of the preparation process of amorphous carbon-coated silicon [74], (b) CV curves of Si-200 at a scan rate of 0.1 mV•s −1 ; (c) Galvanostatic discharge/charge profiles of Si-200 at 0.2 A•g −1 ; (d) Cycling performance of various nano-Si at 0.2 A•g −1[81]; and (e) Rate capability of the different silicon oxycarbide (SiOC) samples measured at various C-rates from 180 to 3600 mA•g −1[82].…”

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confidence: 99%

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Recent Advances on Materials for Lithium-Ion Batteries

et al. 2021

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Environmental issues related to energy consumption are mainly associated with the strong dependence on fossil fuels. To solve these issues, renewable energy sources systems have been developed as well as advanced energy storage systems. Batteries are the main storage system related to mobility, and they are applied in devices such as laptops, cell phones, and electric vehicles. Lithium-ion batteries (LIBs) are the most used battery system based on their high specific capacity, long cycle life, and no memory effects. This rapidly evolving field urges for a systematic comparative compilation of the most recent developments on battery technology in order to keep up with the growing number of materials, strategies, and battery performance data, allowing the design of future developments in the field. Thus, this review focuses on the different materials recently developed for the different battery components—anode, cathode, and separator/electrolyte—in order to further improve LIB systems. Moreover, solid polymer electrolytes (SPE) for LIBs are also highlighted. Together with the study of new advanced materials, materials modification by doping or synthesis, the combination of different materials, fillers addition, size manipulation, or the use of high ionic conductor materials are also presented as effective methods to enhance the electrochemical properties of LIBs. Finally, it is also shown that the development of advanced materials is not only focused on improving efficiency but also on the application of more environmentally friendly materials.

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Preparation of polyethylene/Siloxene nanocomposites through siloxene‐MgCl supported Ziegler‐Natta catalyst

Yan,

Fang,

Zhang

et al. 2024

Polymer Composites

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The two‐dimensional (2D) inorganic fillers could significantly improve the properties of polyolefin, thereby satisfying a wider range of applications. Herein, in this research, high‐performance polyethylene (PE)/siloxene nanocomposites were prepared through an in‐situ polymerization with layered siloxene‐supported Ti‐based catalyst. The catalytic ethylene polymerization activity of the siloxene‐supported Ziegler‐Natta catalyst was almost twice that of the MgCl2/TiCl4 catalyst when equal weights of catalysts were used. During the in‐situ polymerization, the layered siloxene fillers exhibited uniform dispersion within the PE matrix. The incorporation of a minimal amount of siloxene filler resulted in a notable enhancement in the thermal stability and mechanical properties of PE. The breaking strength, modulus, elongation at break, and Td5% of PE/siloxene nanocomposites with only 0.71 wt% siloxene were increased by 115.7%, 45.6%, 50.6%, and 58.2°C, respectively. Therefore, this research presents a straightforward method for manufacturing PE with outstanding performance.Highlights PE/siloxene nanocomposites were prepared through in‐situ polymerization. Siloxene is uniformly scattered in the PE matrix. The siloxene and matrix exhibit excellent interfacial adhesion. PE/siloxene nanocomposites with excellent properties were obtained.

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A low temperature MgH2-AlCl3-SiO2 system to synthesize nano-silicon for high-performance Li-ion batteries

Cited by 20 publications

References 33 publications

Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

Recent Advances on Materials for Lithium-Ion Batteries

Preparation of polyethylene/Siloxene nanocomposites through siloxene‐MgCl supported Ziegler‐Natta catalyst

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