Silane-Derived SEI Stabilization on Thin-Film Electrodes of Nanocrystalline Si for Lithium Batteries

Song, Seung‐Wan; Baek, Seung Yeon

doi:10.1149/1.3028216

Cited by 87 publications

(131 citation statements)

References 24 publications

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“…5a-a', the C-Si surface shows strong IR features below 900 cm , related to the reduction of organic carbonate solvents. 16,17,[22][23][24]31,32,[40][41][42] With 1-(trimethylsilyloxy)-1,3-butadiene, Fig. 5b-b', the CSi surface also shows strong IR features below 900 cm .…”

Section: Resultsmentioning

confidence: 96%

“…Consensus regarding the surface chemistry and its relationship with performance are yet to be reached. We found that the Si reacted with lithium saltderived species more actively than carbonate-based organic solvents in the conventional electrolyte, 16 which was somewhat different interfacial process from that of lithiated graphite that formed a stable solid-electrolyte interphase (SEI) layer composed of primarily organic compounds mostly during initial cycling. 17 It was claimed that the surface of Si needed to be protected from lithium salt of electrolyte.…”

Section: Introductionmentioning

confidence: 96%

“…17 It was claimed that the surface of Si needed to be protected from lithium salt of electrolyte. 16 Organoalkoxysilane is of our particular interest as a surface modifying agent to Si, since the organoalkoxysilane can form the Si-O-Si molecular linkages with the surface silanol groups of Si. 16,18,19 The Si-O-Si molecular cross-linking for the formation of siloxane occurs via axial self-assembly following intermolecular condensation; -Si-OH + Si(R)4-x(OR)x → -Si-O-Si(R) 4-x (OR) x-1 + ROH (R = alkyl group).…”

Section: Introductionmentioning

confidence: 99%

“…16 Organoalkoxysilane is of our particular interest as a surface modifying agent to Si, since the organoalkoxysilane can form the Si-O-Si molecular linkages with the surface silanol groups of Si. 16,18,19 The Si-O-Si molecular cross-linking for the formation of siloxane occurs via axial self-assembly following intermolecular condensation; -Si-OH + Si(R)4-x(OR)x → -Si-O-Si(R) 4-x (OR) x-1 + ROH (R = alkyl group). 20 The presence of trace water assists the hydrolysis of silanes and equatorial polycondensation on neighboring silane molecules, forming three dimensional (3D) self-assembled siloxane network.…”

Section: Introductionmentioning

confidence: 99%

“…16,[21][22][23][24] Polymeric binder often gives interfering signals in IR spectroscopic data, which obstructs distinguishing newly formed surface species from the binder. Thin-films prepared with pulsed laser deposition (PLD), which generally possess a strong physical interfacial adherence to electronically conductive substrate, allow the observation of material's intrinsic surface structure and reaction, and inhibit a peel-off event of the film during extended cycling in lithium cells.…”

Section: Introductionmentioning

confidence: 99%

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Control of Surface Chemistry and Electrochemical Performance of Carbon-coated Silicon Anode Using Silane-based Self-Assembly for Rechargeable Lithium Batteries

Choi¹,

Nguyen²,

Song³

2010

Bulletin of the Korean Chemical Society

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Silane-based self-assembly was employed for the surface modification of carbon-coated Si electrodes and their surface chemistry and electrochemical performance in battery electrolyte depending on the molecular structure of silanes was studied. IR spectroscopic analyses revealed that siloxane formed from silane-based self-assembly possessed Si-O-Si network on the electrode surface and high surface coverage siloxane induced the formation of a stable solid-electrolyte interphase (SEI) layer that was mainly composed of organic compounds with alkyl and carboxylate metal salt functionalities, and PF-containing inorganic species. Scanning electron microscopy imaging showed that particle cracking were effectively reduced on the carbon-coated Si when having high coverage siloxane and thickened SEI layer, delivering > 1480 mAh/g over 200 cycles with enhanced capacity retention 74% of the maximum discharge capacity, in contrast to a rapid capacity fade with low coverage siloxane.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Control of Surface Chemistry and Electrochemical Performance of Carbon-coated Silicon Anode Using Silane-based Self-Assembly for Rechargeable Lithium Batteries

Choi¹,

Nguyen²,

Song³

2010

Bulletin of the Korean Chemical Society

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Perfluoro Macrocyclic Ether as an Ambifunctional Additive for High‐Performance SiO and Nickel 88%‐Based High‐Energy Li‐ion Battery

Kwak

et al. 2023

Adv Funct Materials

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State‐of‐the‐art lithium (Li)‐ion batteries employ silicon anode active material at a limited fraction while strongly relying on fluoroethylene carbonate (FEC) electrolyte additive exceeding 10 wt.% to enable stable cycling. The swelling issue of silicon in the aspect of solid electrolyte interphase (SEI) instability and a risk of safety hazards and high manufacturing cost due to FEC has motivated the authors to design a well‐working fluorinated additive substitute. High‐capacity cells employing nickel‐rich oxide cathode are pursued by operating at > 4.2 V versus Li/Li+, for which anodic stability of electrolyte is required. Herein, a highly effective new ambifunctional additive of icosafluoro‐15‐crown 5‐ether is proposed at a little fraction of 0.4 wt.% for the stabilized interfaces and reduced swelling of high capacity (3.5 mAh cm−2) 5 wt.% SiO‐graphite anode and LiNi0.88Co0.08Mn0.04O2 cathode. Utilizing together with a lowered fraction of FEC, reversible long 300 cycles at 4.35 V and 1 C (225 mA g−1) are achieved. Material characterization results reveal that such stabilization is derived from the surface passivation of both anode and cathode with perfluoro ether, LiF, and LixPFy species. The present study gives insight into electrolyte formulation design with lower cost and both‐side stabilization strategies for silicon and nickel‐rich active materials and their interfaces.

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Advances in the Application of Silicon and Germanium Nanowires for High‐Performance Lithium‐Ion Batteries

2016

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Li-alloying materials such as Si and Ge nanowires have emerged as the forerunners to replace the current, relatively low-capacity carbonaceous based Li-ion anodes. Since the initial report of binder-free nanowire electrodes, a vast body of research has been carried out in which the performance and cycle life has significantly progressed. The study of such electrodes has provided invaluable insights into the cycling behavior of Si and Ge, as the effects of repeated lithiation/delithiation on the material can be observed without interference from conductive additives or binders. Here, some of the key developments in this area are looked at, focusing on the problems encountered by Li-alloying electrodes in general (e.g., pulverization, loss of contact with current collector etc.) and how the study of nanowire electrodes has overcome these issues. Some key nanowire studies that have elucidated the consequences of the alloying/dealloying process on the morphology of Si and Ge are also considered, in particular looking at the impact that effects such as pore formation and lithium-assisted welding have on performance. Finally, the challenges for the practical implementation of nanowire anodes within the context of the current understanding of such systems are discussed.

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Silane-Derived SEI Stabilization on Thin-Film Electrodes of Nanocrystalline Si for Lithium Batteries

Cited by 87 publications

References 24 publications

Control of Surface Chemistry and Electrochemical Performance of Carbon-coated Silicon Anode Using Silane-based Self-Assembly for Rechargeable Lithium Batteries

Control of Surface Chemistry and Electrochemical Performance of Carbon-coated Silicon Anode Using Silane-based Self-Assembly for Rechargeable Lithium Batteries

Perfluoro Macrocyclic Ether as an Ambifunctional Additive for High‐Performance SiO and Nickel 88%‐Based High‐Energy Li‐ion Battery

Advances in the Application of Silicon and Germanium Nanowires for High‐Performance Lithium‐Ion Batteries

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