Identification of the Solid Electrolyte Interface on the Si/C Composite Anode with FEC as the Additive

Li, Qi; Liu, Xiangsi; Han, Xiang; Xiang, Yuxuan; Zhong, Guiming; Wang, Jian; Zheng, Bizhu; Zhou, Jigang; Yang, Yong

doi:10.1021/acsami.8b22221

Cited by 132 publications

(90 citation statements)

References 43 publications

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“…In this work, the specific capacities of all electrodes are calculated based on the mass of Si in the active materials. Due to the fluoroethylene carbonate (FEC) additive in the electrolytes decomposes at 1.24 V,35 cyclic voltammetry (CV) tests of Si NPs, Si/C and C‐SCP electrodes were performed at a scanning rate of 0.1 mV S −1 in a voltage range of 0.01–1.2 V (vs Li/Li + ) for the first 10 cycles. As shown in Figure S10 (Supporting Information), the broad reduction peak at ≈0.67 V of the first cycle is assigned to the formation reaction of solid electrolyte interface (SEI) on Si surface,36 which disappears in the subsequent cycles.…”

Section: Resultsmentioning

confidence: 99%

Accommodation of Silicon in an Interconnected Copper Network for Robust Li‐Ion Storage

Liu

Sun

Yuan

et al. 2020

Adv Funct Materials

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Silicon (Si)‐based materials are one of the most promising anodes to be applied in rechargeable lithium ion batteries. However, the active Si/electrolyte interface causes continuous side reactions and poor conductivity, which significantly decreases the cycling stability. Cu is the only metallic current collector that has been known to promote electron conduction and lithium‐ion transfer without alloying reaction occurrence. However, to the best current knowledge, scalable interface engineering incorporating Cu has not been reported. Herein, this conductive Cu interface (CCI) is constructed through a self‐assembly carbothermic reduction method to achieve efficient protection of Si/electrolyte interfaces while allowing for fast Li+ diffusion. The energy barrier of lithium‐ion diffusion through Cu is calculated to be 0.1965 eV, which is much lower than that through Au, Fe, and Ni films. Benefiting from the enhanced interfacial protection and kinetics of Si with CCI, a fading rate of only 0.068% is maintained for 1000 cycles and an aerial capacity of 4.78 mAh cm−2 is achieved after 280 cycles, which is comparable to the industry standards required for practical application.

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Section: Resultsmentioning

confidence: 99%

Accommodation of Silicon in an Interconnected Copper Network for Robust Li‐Ion Storage

Liu

Sun

Yuan

et al. 2020

Adv Funct Materials

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“…Figure 4a exhibits the cyclic voltammetry (CV) curves of Si/C-300 for the initial three cycles. Ab road and weak irreversible peak appeared at approximately 0.98 Vi nt he first cathodic scan, indicating the formationo fa nS EI film caused by the decompositiono fe lectrolyte as wella st he reduction of fluoroethylene carbonate (FEC), whereas the other peaks are associated with the lithiation/delithiationp rocesses in Si and C. [14,38,43] Concurrently,t here is a sharp peak below 0.1 V, which can be assigned to the solidstate amorphization as well as lithiation of Si. [14,26] In the anodic scan, two broad peaks centered at approximately 0.35 Vand 0.53 Vare ascribed to the phaset ransition between amorphous Li x Si and Si.…”

Section: Resultsmentioning

confidence: 99%

“…The capacity loss in the first cycle may be assigned to thei rreversible formation of the stable SEI film, irreversible tappingo fL i + on the surface, and reduction of FEC. [43,45,46] The cycling behavior of Si/C was investigateda tacurrent density of 200 mA g À1 .M eanwhile,R H-Si, which was obtained by calcining Si/C in air,w as also examined under the same conditions to illustrate the effecto fc arbon on the electrochemicalp erformance. Unlike bulk Si and RH-Si, Si/C delivers an enhanced electrochemical performance owing to the small size andc arbon matrix without any further modification or coating process.…”

Section: Resultsmentioning

confidence: 99%

Simplified Synthesis of Biomass‐Derived Si/C Composites as Stable Anode Materials for Lithium‐Ion Batteries

Majeed

Saleem

Wang

et al. 2020

Chemistry A European J

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Synthesis of silicon/carbon (Si/C) composites from biomass resources could enable the effective utilization of agricultural products in the battery industry with economical as well as environmental benefits. Herein, a simplified process was developed to synthesize Si/C from biomass, by using a low‐cost agricultural byproduct “rice husk (RH)” as a model. This process includes the calcination of RH for SiO2/C and the reduction of SiO2/C by Al in molten salts at a moderate temperature. This process does not need the removal of carbon before thermal reduction of SiO2, which is thought to be necessary to avoid the formation of SiC at elevated temperatures. Thus, carbon derived from biomass can be directly used for Si/C composites for anode materials. The resultant Si/C shows a high reversible capacity of 1309 mAh g−1 and long cycle life (300 cycles). This research advocates a new and simplified strategy for the synthesis of RH‐based biomass‐derived Si/C, which is beneficial for low‐cost, environmentally friendly, and green energy storage applications.

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“…Microscopic observation revealed that FEC can form a denser SEI layer than other conventional additives used in Si‐based anodes, which prevents small molecules from penetrating into the Si anode surface. In addition, a large amount of LiF formed can avoid pulverization of Si particles . The ethylene carbonate (EC)‐free FEC‐based electrolyte is found to achieve higher specific capacity and better capacity retention in terms of long‐term cycling .…”

Section: Selection Of Electrolyte For Silicon Anodementioning

confidence: 99%

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

Hou

Yang

2020

ChemNanoMat

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Silicon has an extremely high theoretical capacity, a low voltage platform, and abundant natural reserves. It is considered to be one of the most promising anode materials for lithium-ion batteries. However, there are still many problems with silicon as an anode material for lithium-ion batteries. During the lithiation/delithiation of silicon, a huge volume expansion occurs, causing the silicon particles to pulverize and the capacity to drop sharply. Furthermore, the continuous increase in the silicon surface solid electrolyte interphase (SEI) films and the poor conductivity of silicon affect the specific capacity of the battery. Means to improve silicon-based anodes with regard to electrode cycling performance and electrode capacity include structural design, composite preparation, or improvements in electrolytes and binders (for example, designing silicon nanomaterials of different dimensions from 0D to 3D, including silicon nanoparticles, nanowires, nanorods, thin films, porous silicon, and core-shell structures). Silicon has been combined with different materials to buffer its own volume expansion, resulting in excellent performance. In addition, the design of a reasonable electrolyte solution, as well as the development of a selfhealing binder is one of the main methods to improve Sibased anodes. In recent years, sodium/potassium ion batteries have been increasingly studied, and silicon and sodium/potassium can be alloyed. The corresponding theoretical capacity can reach 954 mAh g À 1 and 955 mAh g À 1 , respectively. Advances in silicon-based anodes for sodium/ potassium ion storage are summarized herein.ductility. [25] It can increase the conductivity of silicon and adapt to the large volume expansion of silicon. In addition, some are compounded with silicon or metal or metal oxides. Such as copper, silver, tin oxide and titanium oxide. [39][40][41][42][43][44] In addition to changing the silicon's own morphological structure and preparing composite materials, the design and selection of electrolytes and binders is to improve the performance of silicon-based electrodes from the outside. By selecting the appropriate electrolytes, the electrode materials can be effectively reduced deterioration. At present, various additive-modified organic solvent electrolytes, ionic liquid electrolytes, and all-solid electrolytes are widely used in silicon-based anodes. [45][46][47][48] In addition, it is widely applicable to the binder polyvinylidene fluoride(PVDF) of lithium ion battery electrode materials, but

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Identification of the Solid Electrolyte Interface on the Si/C Composite Anode with FEC as the Additive

Cited by 132 publications

References 43 publications

Accommodation of Silicon in an Interconnected Copper Network for Robust Li‐Ion Storage

Accommodation of Silicon in an Interconnected Copper Network for Robust Li‐Ion Storage

Simplified Synthesis of Biomass‐Derived Si/C Composites as Stable Anode Materials for Lithium‐Ion Batteries

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

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