Thickness gradient promotes the performance of Si-based anode material for lithium-ion battery

Guo, Zhenbin; Yao, Hailong

doi:10.1016/j.matdes.2020.108993

Cited by 8 publications

(4 citation statements)

References 52 publications

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“…However, the practical implementation of Si-based anodes for commercial applications is limited by the dramatic volume expansion of 100− 300% experienced by these materials upon cycling, which results in extensive particle cracking, low initial Coulombic efficiency, and poor cycle life. 12,13 Therefore, the use of silicon/graphite composite anodes with 0−20 wt % of Si nanoparticles has been favored, although it tends to increase both manufacturing complexity and cost. 14−16 Li 4 Ti 5 O 12 (LTO) has a high intercalation potential (1.55 V vs Li/Li + ) resulting from Ti 4+ /Ti 3+ redox couple that makes it inherently safer than graphite by eliminating dendrite formation but results in lower voltage and hence lower energy density in a full cell.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, pure silicon and Si oxides (SiO x ) have been investigated extensively as the theoretical specific capacity of Si-based anodes is 1 order of magnitude higher than that of graphite. However, the practical implementation of Si-based anodes for commercial applications is limited by the dramatic volume expansion of 100–300% experienced by these materials upon cycling, which results in extensive particle cracking, low initial Coulombic efficiency, and poor cycle life. , Therefore, the use of silicon/graphite composite anodes with 0–20 wt % of Si nanoparticles has been favored, although it tends to increase both manufacturing complexity and cost. − …”

Section: Introductionmentioning

confidence: 99%

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Optimization of Electrode and Cell Design for Ultrafast-Charging Lithium-Ion Batteries Based on Molybdenum Niobium Oxide Anodes

Lakhdar

Geary

Houck

et al. 2022

ACS Appl. Energy Mater.

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Niobium oxides are an emerging class of anode materials for use in high-power lithium-ion batteries. Galvanostatic cycling and electrochemical impedance spectroscopy (EIS) were used in this study to investigate the influence of electrode porosity, electrode mass ratio, and cycling rate on the capacity, cycle life, and ionic conductivity of Li-ion battery cells based on a modified micron-sized MoNb 12 O 33 (MNO) anode powder. Both electrode and cell designs were found to have a significant impact on the rate performance and cycle life of Li-ion half- and full cells. A higher specific capacity, improved rate performance, and a longer cycle life were obtained in both anode and cathode half-cells by lowering the electrode porosity through calendaring. MNO/Li half-coin cells displayed excellent cyclability, reaching 80% state of health (SOH) after 600 cycles at C/2 charge and 1C discharge. MNO/NMC622 full-coin cells displayed a high capacity of 179 mAh g –1 at 100 mA g –1 (0.5 mA cm –2 ) and excellent cyclability at 25 °C, reaching 70% SOH after over 1000 cycles at 1 mA cm –2 after optimizing their N/P ratio. Excellent cyclability was obtained at both 1C/1C and fast 2C/2C cycling, reaching 80% SOH after 700 and 470 cycles, respectively. Full-coin and small pouch cells had outstanding rate performance as they could be charged from 0 to 84% capacity in less than 5 min at 10 mA cm –2 and to 70% SOC in 120 s at 20 mA cm –2 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of Electrode and Cell Design for Ultrafast-Charging Lithium-Ion Batteries Based on Molybdenum Niobium Oxide Anodes

Lakhdar

Geary

Houck

et al. 2022

ACS Appl. Energy Mater.

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“…Although many strategies have been proposed to improve the cycling stability of LIBs, nanosized Si/C composites unfavorably result in lower tap density and poorer volume energy density, limiting their practical application. − According to previous research, microsized Si/C composites with a porous or hollow structure can effectively promote the tap density with a stable integral structure and retain the advantages of nanostructures fabricated via microemulsion, , spray drying, − and magnesium thermal reduction. , Moreover, instead of using micro-Si, Cui’s group and Wu et al prepared microsized Si/C microspheres assembled by nano-Si exhibiting excellent performance.…”

Section: Introductionmentioning

confidence: 99%

Architected Si/C Micro–Nanostructures with Air Cushion-Inspired Stress Mitigation Strategies for Lithium-Ion Battery Anodes

Jia

Liu

et al. 2023

ACS Appl. Nano Mater.

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Silicon/carbon (Si/C) composites have emerged as promising anode materials for next-generation lithium-ion batteries (LIBs) due to their high power and energy density, but managing the stress resulting from the large volume change of Si during charging and discharging remains a major challenge. To address this issue, we present a novel microsized porous Si/C-based anode design (AC_Si/C) that incorporates Si@C core−shell nanoparticles and hollow carbon nanospheres as deformable cushions fabricated using a scalable microemulsion approach. Our hybrid anode material system offers high ion and electron conductivity and efficient stress mitigation via the deformable hollow carbon nanospheres, resulting in improved cycling and rate performance. Finite element simulations reveal the stress mitigation mechanisms of the hollow carbon nanospheres, and the AC_Si/C nanostructure exhibits a high reversible specific capacity (855.3 mA h g −1 at 2 A g −1 over 500 cycles) and good capacity reservation for rate performance tests under various current densities. The microemulsion-based synthesis method enables large-scale production of porous Si/C nanocomposites as high-performance commercial anode material systems, demonstrating the potential of this air cushion-inspired design for the development of next-generation high-performance LIBs.

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“…To mitigate the in-plane fracture and interfacial delamination of the silicon film, researchers have reported different strategies, such as reducing the silicon film thickness [7], increasing the surface roughening of the current collector [8,9], patterning the film [10,11], designing the gradient silicon concentration [12] and thickness [13], and so on. In this regard, fabricating the composite thin film to replace the pure silicon film is another effective method to buffer the volume expansion and interface fracture.…”

Section: Introductionmentioning

confidence: 99%

Graphene mitigated fracture and interfacial delamination of silicon film anodes through modulating the stress generation and development

Ye¹,

Liu²,

Shao³

et al. 2021

Nanotechnology

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Silicon film is an attractive anode candidate in lithium ion batteries due to its two-dimensional (2D) morphology that is beneficial to buffer the large volume expansion of traditional silicon anodes. Even so, the generation of stress during the lithiation/delithiation process can still lead to the cracking and delamination of the silicon film from the current collector, ultimately resulting in the fast failure of the electrode. Laying a graphene layer between the silicon film and the current collector has been demonstrated to alleviate the stress generated during the battery cycling, but its universal application in commercial silicon structures with other dimensionalities remains technically challenging. Putting graphene on top of a 2D silicon film is more feasible and has also been shown with enhanced cycling stability, but the underneath mechanical mechanisms remain unclear. Herein, using the combination of 2D graphene and 2D silicon films as a model material, we investigate the stress generation and diffusion mode during the battery cycling to disclose the mechanical and electrochemical optimization of a silicon anode experimentally and theoretically. As a result, the optimum thickness of the silicon film and the coated graphene layers are obtained, and it is found the in-plane cracking and out-of-plane delamination of the silicon film could be mitigated by coating graphene due to the slow transfer of the normal and shear stresses. This work provides some understanding of the electrochemically derived mechanical behaviors of the graphene-coated battery materials and guidelines for developing stable high-energy-density batteries.

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Thickness gradient promotes the performance of Si-based anode material for lithium-ion battery

Cited by 8 publications

References 52 publications

Optimization of Electrode and Cell Design for Ultrafast-Charging Lithium-Ion Batteries Based on Molybdenum Niobium Oxide Anodes

Optimization of Electrode and Cell Design for Ultrafast-Charging Lithium-Ion Batteries Based on Molybdenum Niobium Oxide Anodes

Architected Si/C Micro–Nanostructures with Air Cushion-Inspired Stress Mitigation Strategies for Lithium-Ion Battery Anodes

Graphene mitigated fracture and interfacial delamination of silicon film anodes through modulating the stress generation and development

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