A stable lithiated silicon–chalcogen battery via synergetic chemical coupling between silicon and selenium

Eom, KwangSup; Lee, Jung Tae; Oschatz, Martin; Wu, Feixiang; Kaskel, Stefan; Yushin, Gleb; Fuller, Thomas F.

doi:10.1038/ncomms13888

Cited by 49 publications

(24 citation statements)

References 44 publications

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“…Several lithium ion host materials like carbons [177][178][179][180][181], Ge [182], Si [183][184][185][186][187] or Si/carbon composites [175,[188][189][190][191][192][193][194], pre-lithiated before cell assembling, are reported as alternative negative electrode materials for the replacement of metallic Li in sulphur cells. Within these reports, mainly two different techniques for the pre-lithiation of the negative electrode were used, namely the electrochemical pre-lithiation and the direct contact to Li metal, as already described above.…”

Section: Pre-lithiation Of the Negative Electrode-charged Statementioning

confidence: 99%

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

et al. 2018

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Abstract:In order to meet the sophisticated demands for large-scale applications such as electro-mobility, next generation energy storage technologies require advanced electrode active materials with enhanced gravimetric and volumetric capacities to achieve increased gravimetric energy and volumetric energy densities. However, most of these materials suffer from high 1st cycle active lithium losses, e.g., caused by solid electrolyte interphase (SEI) formation, which in turn hinder their broad commercial use so far. In general, the loss of active lithium permanently decreases the available energy by the consumption of lithium from the positive electrode material. Pre-lithiation is considered as a highly appealing technique to compensate for active lithium losses and, therefore, to increase the practical energy density. Various pre-lithiation techniques have been evaluated so far, including electrochemical and chemical pre-lithiation, pre-lithiation with the help of additives or the pre-lithiation by direct contact to lithium metal. In this review article, we will give a comprehensive overview about the various concepts for pre lithiation and controversially discuss their advantages and challenges. Furthermore, we will critically discuss possible effects on the cell performance and stability and assess the techniques with regard to their possible commercial exploration.

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Section: Pre-lithiation Of the Negative Electrode-charged Statementioning

confidence: 99%

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

et al. 2018

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“…The mechanism of chalcogen‐expansion of the cluster is of particular relevance in view of the considerable interest in chalcogen and chalcogenide diffusion through silicon materials spurred by applications in micro‐ and optoelectronics as well as batteries [19d, 28] . The formation of heterosiliconoids 2 a – c is readily understood by an initial oxidation of the pending silylene center by the chalcogen leading to the formation of an intermediate siliconoid [1‐Int] with Si=E functionality in ligato ‐position.…”

Section: Methodsmentioning

confidence: 99%

Chalcogen‐Expanded Unsaturated Silicon Clusters: Thia‐, Selena‐, and Tellurasiliconoids

Poitiers

Hüch

Zimmer

et al. 2020

Chemistry A European J

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Reactions of silylenes with heavier chalcogens (E) typically result in Si=E double bonds or their π‐addition products. In contrast, the oxidation of a silylene‐functionalized unsaturated silicon cluster (siliconoid) with Group 16 elements selectively yields cluster expanded siliconoids Si7E (E=S, Se, Te) fully preserving the unsaturated nature of the cluster scaffold as evident from the NMR signatures of the products. Mechanistic considerations by DFT calculations suggest the intermediacy of a Si6 siliconoid with exohedral Si=E functionality. The reaction thus may serve as model system for the oxidation of surface‐bonded silylenes at Si(100) by chalcogens and their diffusion into the silicon bulk.

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“…The carbon-carbon bond length of graphene is 0.142 nm. The carrier mobility at room temperature is as high as 15,000 cm 2 V −1 s −1 , and its corresponding resistivity is 10 -6 Ωcm (the lowest resistivity among materials known in the art) [12][13][14][15]. Graphene-based silicon/carbon composite materials can not only improve the volume change of nano-silicon and form a stable SEI film but also improve the electrical conductivity and lithium storage performance of silicon nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries

Cong¹,

Park²,

Jo³

et al. 2021

Preprint

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We report a self-assembly synthesis of silicon nanoparticles/nitrogen-doped reduced graphene oxide/ carbon nanofiber (Si@N-doped rGO/CNF) composites as potential high-performance anodes for rechargeable lithium-ion batteries (LIB) through the electrostatic attraction between amino and carboxyl groups. Nitrogen atoms generate a large number of vacancies or defects on the graphite plane, providing additional transmission channels for the diffusion of lithium ions, and improving the conductivity of the electrode. Carbon nanofiber (CNF) can help maintain the stability of the electrode structure and prevent silicon nanoparticles from falling off the electrode, prevent silicon nanoparticles from being directly exposed to the electrolyte, and can form a stable solid electrolyte interface (SEI) film. The three-dimensional conductive structure composed of Si, nitrogen atom-doped reduced graphene oxide (N-doped rGO), and CNF can effectively buffer the volume changes of silicon nanoparticles, shorten the transmission distance of lithium ions (Li+) and electrons, and make the electrode have good conductivity and stability in mechanical properties. In addition, compared with the Si@N-doped rGO and Si/rGO/CNF composite electrode, the Si@N-doped rGO/CNF composite electrode shows good cycle performance and rate capability, and its reversible specific capacity can reach 1418.8 mAh/g. The capacity retention rate is 64.7%, and the coulomb efficiency is 95%.

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A stable lithiated silicon–chalcogen battery via synergetic chemical coupling between silicon and selenium

Cited by 49 publications

References 44 publications

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Pre-Lithiation Strategies for Rechargeable Energy Storage Technologies: Concepts, Promises and Challenges

Chalcogen‐Expanded Unsaturated Silicon Clusters: Thia‐, Selena‐, and Tellurasiliconoids

Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries

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