A Highly Reversible Nano‐Si Anode Enabled by Mechanical Confinement in an Electrochemically Activated LixTi4Ni4Si7 Matrix

Son, Seoung‐Bum; Kim, Seul Cham; Kang, Chung Nam; Yersak, Thomas A.; Kim, Yoon-Chang; Lee, Chun-Gyoo; Moon, Seokil; Cho, Jong Soo; Moon, Jeong-Tak; Oh, Kyu Hwan; Lee, Se-Hee

doi:10.1002/aenm.201200180

Cited by 97 publications

(73 citation statements)

References 40 publications

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“…FIB (FEI, NOVA200 dual beam system) equipped with a mobile air-lock chamber was used for TEM sample preparation 50 . TEM and EELS analysis were performed with a FEI Tecnai F20 operated at 200 keV.…”

Section: Methodsmentioning

confidence: 99%

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

et al. 2015

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We are currently in the midst of a race to discover and develop new battery materials capable of providing high energy-density at low cost. By combining a high-performance Si electrode architecture with a room temperature ionic liquid electrolyte, here we demonstrate a highly energy-dense lithium-ion cell with an impressively long cycling life, maintaining over 75% capacity after 500 cycles. Such high performance is enabled by a stable half-cell coulombic efficiency of 99.97%, averaged over the first 200 cycles. Equally as significant, our detailed characterization elucidates the previously convoluted mechanisms of the solid-electrolyte interphase on Si electrodes. We provide a theoretical simulation to model the interface and microstructural-compositional analyses that confirm our theoretical predictions and allow us to visualize the precise location and constitution of various interfacial components. This work provides new science related to the interfacial stability of Si-based materials while granting positive exposure to ionic liquid electrochemistry.

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Section: Methodsmentioning

confidence: 99%

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

et al. 2015

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“…The reversible lithiation product of Li 2 28) were introduced to form Si/C and Si/metal silicide hybrid structures by different fabrication methods. The introduction of metal silicides not only improves the electronic conductivity of the Si-based anode, but also buffers partially the volume changes of Si during cycling as they are mostly inactive in the lithium reaction.…”

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A hybrid Si@FeSi_y/SiO_x anode structure for high performance lithium-ion batteries via ammonia-assisted one-pot synthesis

et al. 2015

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“…20 One effective strategy to accommodate the extreme volume changes of Si is to limit its extent of alloying with Li by introducing resilient additives into the electrode. [11][12][13][14][21][22][23] These additives encapsulate the Si particles as rigid matrix agents, restricting the particles' free expansion during lithiation, and thereby lowering the number of moles of Li alloying with each Si particle. The restricted lithiation of the Si particles results in a lower specific capacity for the electrode, but this limited capacity can be more reliably maintained with fewer irreversible capacity losses in the subsequent cycles.…”

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Nanostructured Si/C Fibers as a Highly Reversible Anode Material for All-Solid-State Lithium-Ion Batteries

Kim

Dunlap

Han

et al. 2018

J. Electrochem. Soc.

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This study demonstrates the application of Si/C composite fibers as anode materials for all-solid-state lithium-ion batteries. Using polyacrylonitrile as the carbon precursor, Si/C fibers were prepared through electrospinning and subsequent heat-treating processes. To investigate the correlation between fiber diameter and electrochemical performance, we prepared three electrodes (A, B, C), containing Si/C fibers with ∼2 μm, ∼1 μm and ∼0.1 μm diameters, respectively. Our results revealed that although the composition of all three electrodes was nearly the same, the Si/C fiber based electrodes exhibited better capacity retention when their fiber diameters were smaller. Normalized to the total mass of electrode composite, the solid-state half-cell prepared with the smallest diameter (∼0.1 μm) Si/C fibers achieved a reversible specific capacity of ∼700 mAh g −1 (normalized to electrode mass) over 70 cycles. We believe that this report can serve as an informative approach toward the utilization of electrospun Si/C fibers as anode materials for all-solid-state lithium-ion batteries. Lithium-ion batteries (LIBs) have widely been used as portable energy storage devices owing to their great reversibility, long cycle life and high power output without memory effect.1,2 However, current LIBs utilizing conventional organic liquid electrolytes still have significant safety risks, such as operational instability at elevated temperatures, leakage of hazardous solvents and ignition by external damages.3-6 To overcome these safety risks, the development of the all-solid-state lithium-ion battery (SLIB) has attracted considerable attention. [3][4][5][6][7][8][9][10][11] In the SLIB configuration, a highly Li-ion conductive solid-state electrolyte (SSE) layer is deployed between positive and negative electrodes in place of the organic liquid electrolytes typically used in LIBs. This replacement of the liquid electrolyte with a highly conductive ceramic material is expected to improve both the SLIB's thermal and mechanical stabilities.To date, graphite has been extensively used as an anode material in LIBs; however, its limited capacity (372 mAh g −1 ) has been regarded as a drawback to achieving higher energy density LIBs. Silicon is considered to be a promising anode material alternative to graphite due to its large theoretical capacity (3,579 mAh g −1 ), low cost and high earth abundance.9,11-17 To achieve such a high capacity, Si inevitably undergoes a massive volume expansion/contraction process when alloying/de-alloying with Li. 18,19 Since the repeated volume changes of Si particles during cycling causes cracking, pulverization and rapid capacity fading brought on by the electrochemical isolation of active materials, it is believed that an effective accommodation of this Si volume change is essential for achieving acceptable capacity retention in these anodes. 20One effective strategy to accommodate the extreme volume changes of Si is to limit its extent of alloying with Li by introducing resilient additives into the electro...

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A Highly Reversible Nano‐Si Anode Enabled by Mechanical Confinement in an Electrochemically Activated Li_xTi₄Ni₄Si₇ Matrix

Cited by 97 publications

References 40 publications

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

A hybrid Si@FeSi_y/SiO_x anode structure for high performance lithium-ion batteries via ammonia-assisted one-pot synthesis

Nanostructured Si/C Fibers as a Highly Reversible Anode Material for All-Solid-State Lithium-Ion Batteries

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A Highly Reversible Nano‐Si Anode Enabled by Mechanical Confinement in an Electrochemically Activated LixTi4Ni4Si7 Matrix

Cited by 97 publications

References 40 publications

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

A hybrid Si@FeSiy/SiOx anode structure for high performance lithium-ion batteries via ammonia-assisted one-pot synthesis

Nanostructured Si/C Fibers as a Highly Reversible Anode Material for All-Solid-State Lithium-Ion Batteries

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A Highly Reversible Nano‐Si Anode Enabled by Mechanical Confinement in an Electrochemically Activated Li_xTi₄Ni₄Si₇ Matrix

A hybrid Si@FeSi_y/SiO_x anode structure for high performance lithium-ion batteries via ammonia-assisted one-pot synthesis