Silicon/Graphite Composite Electrodes for High-Capacity Anodes: Influence of Binder Chemistry on Cycling Stability

Hochgatterer, Nikolaus; Schweiger, Mario; Koller, Stefan; Raimann, Peter; Wöhrle, Thomas; Wurm, Cǎlin; Winter, Martin

doi:10.1149/1.2888173

Cited by 438 publications

(395 citation statements)

References 17 publications

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“…Ab initio random structure searching (AIRSS) 47,48 has previously been applied to point defects in the Li-Si system 49,50 . Using AIRSS, B3,500 searches were performed where a Li or Si atom was randomly added or removed from the two-formula-unit c-Li 15 Si 4 (c-Li 3.75 Si) simulation cell and the resulting structure and lattice parameters were relaxed to a local energy minimum. Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

“…However, this high capacity is associated with large volume changes (of up to 300%) 1,2 , resulting in fracture, capacity loss [3][4][5][6][7] and cell design issues. Recently, various nano/micro-sized Si powders 3,[8][9][10][11][12] , nano-Si composites 8,[13][14][15][16] and Si nanowire (SiNW)-based LIBs have been reported 9,[17][18][19] , which can help accommodate the volume expansion. An alternative practical strategy involves the use of Si/graphite composite structures that couple the good capacity and cyclability of graphite with a small fraction of the Si capacity (of an all-Si electrode) to provide modest but still significant increases in capacity.…”

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confidence: 99%

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Revealing lithium–silicide phase transformations in nano-structured silicon-based lithium ion batteries via in situ NMR spectroscopy

et al. 2014

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Nano-structured silicon anodes are attractive alternatives to graphitic carbons in rechargeable Li-ion batteries, owing to their extremely high capacities. Despite their advantages, numerous issues remain to be addressed, the most basic being to understand the complex kinetics and thermodynamics that control the reactions and structural rearrangements. Elucidating this necessitates real-time in situ metrologies, which are highly challenging, if the whole electrode structure is studied at an atomistic level for multiple cycles under realistic cycling conditions. Here we report that Si nanowires grown on a conducting carbon-fibre support provide a robust model battery system that can be studied by 7 Li in situ NMR spectroscopy. The method allows the (de)alloying reactions of the amorphous silicides to be followed in the 2nd cycle and beyond. In combination with density-functional theory calculations, the results provide insight into the amorphous and amorphous-to-crystalline lithium-silicide transformations, particularly those at low voltages, which are highly relevant to practical cycling strategies.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Revealing lithium–silicide phase transformations in nano-structured silicon-based lithium ion batteries via in situ NMR spectroscopy

et al. 2014

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“…400%) during cycling [17][18][19]. Recent results have shown that sodium carboxymethyl cellulose (CMC) and poly(acrylic acid) (PAA) binders improve the electrochemical performance of Si-based anodes compared to poly(vinylidene fluoride) (PVDF) binders [20,21]. It is believed that a robust polymeric binder is a promising means of inhibiting the mechanical fracturing of Si anodes during cycling.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Polymeric Binders for Silicon Anodes in Lithium-Ion Batteries

Choi

Lee

et al. 2015

Journal of Electrochemical Science and Technology

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Advanced polymeric binders with unique functions such as improvements in the electronic conduction network, mechanical adhesion, and mechanical durability during cycling have recently gained an increasing amount of attention as a promising means of creating high-performance silicon (Si) anodes in lithium-ion batteries with high energy density levels. In this review, we describe the key challenges of Si anodes, particularly highlighting the recent progress in the area of polymeric binders for Si anodes in cells.

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“…With respect to nanostructure control, much efforts have been ongoing for the development of synthetic strategies by tuning the micro-and nano-structures of Si-based materials releasing the structural stress and enhancing the kinetics. [13][14][15] Nonetheless, the issues of volume and particle morphology changes seem to be unavoidable, showing the continuous capacity loss with long term Li insertion and extraction.…”

Section: Introductionmentioning

confidence: 99%

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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Silicon/Graphite Composite Electrodes for High-Capacity Anodes: Influence of Binder Chemistry on Cycling Stability

Cited by 438 publications

References 17 publications

Revealing lithium–silicide phase transformations in nano-structured silicon-based lithium ion batteries via in situ NMR spectroscopy

Revealing lithium–silicide phase transformations in nano-structured silicon-based lithium ion batteries via in situ NMR spectroscopy

Recent Progress on Polymeric Binders for Silicon Anodes in Lithium-Ion Batteries

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

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