Constructing a Grape-like Silicon/Mildly Expanded Graphite Microsphere Composite as a High-Performance Anode Material for Lithium-Ion Batteries

Ma, Canliang; Hu, Zhenhui; Song, Ningjing; Wang, Huiqi; Liu, Yanzhen

doi:10.1021/acs.energyfuels.0c02892

Cited by 9 publications

(8 citation statements)

References 37 publications

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“…On the one hand, the carbon component itself has a certain lithium storage capacity, and on the other hand, Si@MnSe nanoparticles are endowed with sufficient electron and ion transport to play their own lithium storage contribution. There is no typical silicon platform in the charge‐discharge curve of Si@MnSe@PPyC/rGO which might be overwritten by the higher charge‐discharge voltage of MnSe, as reported in some work 42 . What is more, its theoretical capacity is calculated to be about 731.7 mAh/g based on the composition of each component Si@MnSe@PPyC/rGO.…”

Section: Resultsmentioning

confidence: 88%

“…There is no typical silicon platform in the charge-discharge curve of Si@MnSe@PPyC/rGO which might be overwritten by the higher charge-discharge voltage of MnSe, as reported in some work. 42 What is more, its theoretical capacity is calculated to be about 731.7 mAh/g based on the composition of each component Si@MnSe@PPyC/rGO. It can be seen that the measured reversible capacity of the composite material is higher than the theoretical value, which might be because some of the lithium ions stores in nanocavities of the composite.…”

Section: Resultsmentioning

confidence: 99%

“…should exhibit excellent cycle performance and rate capacity. 42 Figure 5A presents the first five CV curves of Si@Mn-Se@PPyC/rGO composite electrode. As shown in the first CV circle, only one weak peak at about 0.4 V (vs Li + /Li) appeared in the cathodic scan identify the reaction of the Li + intercalation into electrode (MnSe + xLi + + xe À !…”

Section: Resultsmentioning

confidence: 99%

“…This might be due to the formation of pores between the lamellar structures of the flowerl‐like MnSe and rGO nanosheets, which are consistent with the SEM results. With appropriate specific surface area and pore size which are beneficial for electrode contact with the electrolyte, the as synthesized Si@MnSe@PPyC/rGO should exhibit excellent cycle performance and rate capacity 42 …”

Section: Resultsmentioning

confidence: 99%

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A core@double‐shell structured silicon/ flower‐like manganese selenide/carbon composite as superior dual anode materials of Li/Na‐ion batteries

Wang

Song

et al. 2022

Intl J of Energy Research

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Summary One of the feasible solutions for enhancing new energy density of secondary batteries is to develop high‐performance dual anode materials for lithium and sodium‐ion batteries (LIBs&SIBs). To address this key challenge, we introduce a novel silicon/flower‐like manganese selenide/carbon composite (Si@MnSe@PPyC/rGO) with core@double‐shell structure as potential dual anode materials. The morphology, structure and composition of the composite are determined by means of SEM, TEM, EDS, XRD, Raman, TGA and XPS. The key to the successful synthesis process is that in situ polymerization of polypyrrole on the nanosheet of flower‐like Si@MnO2 preserves the intermediate layer with flower‐like morphology during selenization. Si@MnSe@PPyC/rGO exhibits the high performance owing to exceptional advantages such as the high capacity silicon core, the stable flower‐shaped MnSe and PPyC double shells as protective layer, as well as the excellent conductive network of rGO. This material delivers a greatly enhanced reversible capacity (803 mAh/g at 0.1 A/g), remarkable stability and excellent rate performance (437 mAh/g even at 3.2 A/g) in LIBs. For Na‐ion storage, it pleasantly reaches 323 mAh/g at 0.2 A/g and remains constant at 226.4 mAh/g after 500 cycles at 2.0 A/g. This study provides versatile strategy so as to maintain the unique morphology of nano‐metal oxide during selenization treatment, and supplies a cost‐effective strategy for preparing high‐performance dual‐anode materials for Li/Na‐ion storage. Novelty Statement Novel silicon/flower‐like manganese selenide/carbon composites (Si@MnSe@PPyC/rGO) with core@double‐shell structure are successfully fabricated as superior dual anode materials for Li/Na‐ion storage for the first time. The critical step is the in‐situ coating of PPy on the surface of nanosheets of Si@flower‐like MnO2 which could remain the original flower‐like morphology unchanged during selenization treatment. Si@MnSe@PPyC/rGO exhibits excellent potential as a dual anode material candidate for high performance Li/Na‐ion storage including high capacity, stable cycling performance and high rate capability.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A core@double‐shell structured silicon/ flower‐like manganese selenide/carbon composite as superior dual anode materials of Li/Na‐ion batteries

Wang

Song

et al. 2022

Intl J of Energy Research

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“…It can improve the electronic conductivity of SiO x and can also avoid the direct contact between SiO x and the electrolyte, which is beneficial for the formation of stable SEI, improving the rate and cycle performance of the electrode. Different kinds of silicon/carbon composites have been also adopted to improve the electrochemical performance of Si, such as amorphous carbon, expanded graphite microspheres, CNT, carbon nanofiber, N-doped porous carbon nanofibers, graphene and vertical graphene sheets, and so on. − …”

Section: Introductionmentioning

confidence: 99%

Potassium Ions Regulated the Disproportionation of Silicon Monoxide Boosting Its Performance for Lithium-Ion Battery Anodes

Guo

Sun

et al. 2021

Energy Fuels

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Silicon monoxide (SiO) has captured great attention as one of the most promising anode materials due to its great cycling stability as well as high theoretical capacity. However, hindered by its low initial Coulombic efficiency, the possible large-scale application remains an urgent issue. Herein, through a facile method, potassium ions are introduced into the disproportionation process of SiO to promote the transition from amorphous SiO x into the cristobalite phase with higher crystallinity. The cristobalite phase exhibits lower reaction activity with lithium ions, which reduces the formation of lithium silicate. As a consequence, the cycling stability and the initial Coulombic efficiency (ICE) are improved. In addition, it is proved in our study that increasing the heating temperature is helpful to improve the ICE and cycling stability of SiO. This work provides a facile disproportionation method for the microstructure regulation of SiO, offering a possible avenue for the development of large-scale applications of the SiO anode.

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Ionic/Electronic Dual‐Conductor Coating Layer Fabrication Enabling High‐Performance Silicon Anode

Yang

et al. 2022

Small Structures

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Silicon (Si) has received special attention from both scientific research and corporate development for overcoming the current energy density bottleneck. However, the severe volume change and violent interfacial reaction diminish the full benefits of Si material and hamper its direct commercial utilization. Particle pulverization and the companied ionic/electronic isolation are regarded as the intrinsic reason for performance attenuation. Hence, a strategy that can maintain both electronic and ionic conductance on Si anode during the electrochemical process is of great significant for performance improvement and future commercial promotion. Accordingly, an ionic/electronic dual‐conductor coating layer fabrication route is done by in situ building Li4SiO4 fast ion conductor coating layer and implanting electron conduction network, labeled as Si@Li4SiO4/amorphous carbon (C)/carbon nanotubes (CNTs). Notably, the Si@Li4SiO4/C/CNT electrode delivers excellent long‐term cycling stability and prominent rate capability. These results demonstrate that the in situ‐formed fast ionic conductor coating layer facilitates the rapid Li+ diffusion, and the 3D network structure constructed by CNTs and amorphous carbon (polyvinylpyrrolidone‐derived carbon) effectively reinforce the structural stability and keep the electrical connection for the electrode. This study provides an ionic/electronic dual‐conductor coating design concept for Si‐based anode materials.

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Constructing a Grape-like Silicon/Mildly Expanded Graphite Microsphere Composite as a High-Performance Anode Material for Lithium-Ion Batteries

Cited by 9 publications

References 37 publications

A core@double‐shell structured silicon/ flower‐like manganese selenide/carbon composite as superior dual anode materials of Li/Na‐ion batteries

A core@double‐shell structured silicon/ flower‐like manganese selenide/carbon composite as superior dual anode materials of Li/Na‐ion batteries

Potassium Ions Regulated the Disproportionation of Silicon Monoxide Boosting Its Performance for Lithium-Ion Battery Anodes

Ionic/Electronic Dual‐Conductor Coating Layer Fabrication Enabling High‐Performance Silicon Anode

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