Si-SiOx-Al2O3 nanocomposites as high-capacity anode materials for Li-ion batteries

Kim, Kyungbae; Kim, Moon‐Soo; Choi, Hyerang; Min, Kyeong‐Sik; Kim, Ki-Doo; Kim, Jae‐Hun

doi:10.1007/s13391-017-6406-0

Cited by 17 publications

(6 citation statements)

References 35 publications

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“…As for the components, the Si NPs as active materials are of the crystalline phase, and the average particle size accounts for ≈50 nm (Figure S1a,b, Supporting Information). From the X‐ray photoelectron spectroscopy (XPS) spectra of Si NPs (Figure S1c, Supporting Information), the peaks at 99.4 and 100.6 ev correspond to the binding energy of Si 2p 3/2 and Si 2p 1/2 , respectively, and the peak at 103.3 eV originates from native SiO 2 layer (SiOSi) on the surface . The Si NPs are generally terminated with the hydroxyl group (OH) on their native oxide layer, resulting in a good dispersion in the aqueous solution, whereas the pristine carbon black (CB) particles are reluctant to be mixed with water due to its hydrophobicity.…”

Section: Resultsmentioning

confidence: 99%

3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode

Woo

Park

Kim

et al. 2019

Adv Materials Inter

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Silicon has been considered as a promising anode material due to its high theoretical capacity (3579 mAh g−1), however, it suffers from capacity degradation owing to the series of multiscale fractures in the electrode caused by the volume variation (≈300%) during phase transitions. The molecular/structural design of polymeric binders has been pivotal in overcoming the challenges to improve the integrity of Si anode via strong interactions between active materials and binders. In this respect, the covalently crosslinked polyacrylamide (PAM) network, which effectively maintains its mechanical strength and shape, is introduced as a novel binder system for Si active materials. Unlike the thermal crosslinking, the abundant polar‐functional groups, related to the strong interactions between Si and polymer, are not sacrificed in their network by virtue of the in situ polymerization. Through the PAM gel, the Si‐based electrode exhibits a superior capacity of ≈1526 mAh g−1 at an optimized crosslinker concentration after 500 cycles. In addition, the effect of the chemical/mechanical properties of PAM gel on the electrochemical properties of Si is adequately elucidated. The results will provide meaningful insight regarding the design of novel binders, especially in the application of the covalently crosslinked structure to Si‐based electrodes.

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Section: Resultsmentioning

confidence: 99%

3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode

Woo

Park

Kim

et al. 2019

Adv Materials Inter

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“…More detailed research into the electrochemical reaction process is still needed. [46][47][48] The Si/SiO x @NC-650 anode exhibits a large capacity of 586.6 mAh g À1 after 180 cycles, with ah igh coulombic efficiency of 99.2 %a fter 400 cycles. Thes amples synthesized at 670 8Ca nd 700 8Cw ere also tested as anode materials in LIBs.…”

Section: Resultsmentioning

confidence: 99%

“…This general phenomenon has been widely observed in Si/SiO x ‐based anode materials in LIBs, where the capacity drops to a certain extent and then gradually increases. More detailed research into the electrochemical reaction process is still needed . The Si/SiO x @NC‐650 anode exhibits a large capacity of 586.6 mAh g −1 after 180 cycles, with a high coulombic efficiency of 99.2 % after 400 cycles.…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Frameworks‐Derived Mesoporous Si/SiO_x@NC Nanospheres as a Long‐Lifespan Anode Material for Lithium‐Ion Batteries

Majeed

Cao

et al. 2019

Chemistry A European J

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Silicon (Si)‐based anode materials with suitable engineered nanostructures generally have improved lithium storage capabilities, which provide great promise for the electrochemical performance in lithium‐ion batteries (LIBs). Herein, a metal–organic framework (MOF)‐derived unique core–shell Si/SiOx@NC structure has been synthesized by a facile magnesio‐thermic reduction, in which the Si and SiOx matrix were encapsulated by nitrogen (N)‐doped carbon. Importantly, the well‐designed nanostructure has enough space to accommodate the volume change during the lithiation/delithiation process. The conductive porous N‐doped carbon was optimized through direct carbonization and reduction of SiO2 into Si/SiOx simultaneously. Benefiting from the core–shell structure, the synthesized product exhibited enhanced electrochemical performance as an anode material in LIBs. Particularly, the Si/SiOx@NC‐650 anode showed the best reversible capacities up to 724 and 702 mAh g−1 even after 100 cycles. The excellent cycling stability of Si/SiOx@NC‐650 may be attributed to the core–shell structure as well as the synergistic effect between the Si/SiOx and MOF‐derived N‐doped carbon.

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“…Besides compositing with the carbon matrix, the surface coating is essential to stabilize the SEI layers on the Si-based anode and address the problem of electrode swelling. Among various surface coating materials, Al 2 O 3 has been reported to be effective as an artificial SEI layer on anode and cathode materials in LIBs due to its proper bandgap and ability to conduct Li ions upon lithiation [27][28][29][30][31][32][33][34]. For example, Xiao et al showed that Al 2 O 3 films deposited on Si by atomic layer deposition (ALD) formed Li-ion-conductive LiAlO 2 on the surface, suppressing the chemical reaction between Si and the electrolyte [29].…”

Section: Introductionmentioning

confidence: 99%

A facile and low-cost Al₂O₃ coating as an artificial solid electrolyte interphase layer on graphite/silicon composites for lithium-ion batteries

et al. 2021

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Graphite/silicon (G/Si) composites are considered as possible alternative anode materials to commercial graphite anodes. However, the unstable solid electrolyte interphase (SEI) on G/Si particles results in rapid capacity decay, impeding practical applications. Herein, a facile and low-cost Al2O3 coating was developed to fabricate stable artificial SEI layers on G/Si composites. The amorphous Al2O3 coating with a thickness of 10–15 nm was synthesized by a simple sol–gel method followed by high-temperature annealing. The Al2O3 coated G/Si anode delivers an initial discharge capacity of 540 mAh g−1 at 25 °C and has improved Coulombic efficiency and cycling stability. After 100 cycles, the capacity retention is 76.4%, much higher than the 56.4% of the uncoated anode. Furthermore, the Al2O3 coating was found to be more effective at improving the stability of G/Si at a higher temperature (55 °C). This was explained by the Al2O3 coating suppressing the growth of SEI on Si/G and thus reducing the charge transfer resistance at the G/Si–electrolyte interface. It is expected that the Al2O3 coating prepared by the sol–gel process can be applied to other Si-based anodes in the manufacture of practical high-performance lithium-ion batteries.

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Si-SiOx-Al2O3 nanocomposites as high-capacity anode materials for Li-ion batteries

Cited by 17 publications

References 35 publications

3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode

3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode

Metal–Organic Frameworks‐Derived Mesoporous Si/SiO_x@NC Nanospheres as a Long‐Lifespan Anode Material for Lithium‐Ion Batteries

A facile and low-cost Al₂O₃ coating as an artificial solid electrolyte interphase layer on graphite/silicon composites for lithium-ion batteries

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Si-SiOx-Al2O3 nanocomposites as high-capacity anode materials for Li-ion batteries

Cited by 17 publications

References 35 publications

3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode

3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode

Metal–Organic Frameworks‐Derived Mesoporous Si/SiOx@NC Nanospheres as a Long‐Lifespan Anode Material for Lithium‐Ion Batteries

A facile and low-cost Al2O3 coating as an artificial solid electrolyte interphase layer on graphite/silicon composites for lithium-ion batteries

Contact Info

Product

Resources

About

Metal–Organic Frameworks‐Derived Mesoporous Si/SiO_x@NC Nanospheres as a Long‐Lifespan Anode Material for Lithium‐Ion Batteries

A facile and low-cost Al₂O₃ coating as an artificial solid electrolyte interphase layer on graphite/silicon composites for lithium-ion batteries