A micro-sized Si–CNT anode for practical application <i>via</i> a one-step, low-cost and green method

Li, Chao; Ju, Yuhang; Li, Qi; Yoshitake, Hideya

doi:10.1039/c7ra11350a

Cited by 12 publications

(7 citation statements)

References 47 publications

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“…Thus, the enhancing of CE is an important way for the wide application of silicon anode to increase the energy density of LIBs. [15] In recent years, despite the impressive improvements have been achieved by microstructural material, such as coating treatment, [16,17] silicon-carbon mixture, [15,18] core-shell compound, [19,20] secondary agglomeration [21] and pre-lithiation treatment, [22] it is also using other inert interface stead of the fresh silicon surface. And, without regard to the increasing of synthesis cost and reducing of specific capacity, the exposed silicon interface still accelerates the side-reaction with electrolyte to lead to durative low coulombic efficiency and the life degradation after a few cycles.…”

Section: Introductionmentioning

confidence: 99%

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Zhu

Lao

et al. 2020

ChemElectroChem

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Silicon anodes usually endure low initial coulombic efficiency (ICE) in applications for lithium-ion batteries (LIBs), although the volume expansion and structural stability has been greatly improved under many efforts in the recent years. During the first charge and discharge, a large number of lithium ions can participate in the formation of a solid electrolyte interface (SEI) on anode surface, such as LiF, Li 2 CO 3 and many Li-based compounds, resulting in low efficiency, particularly as the nanosized silicon is widely applied to solve the volume effect. Herein, we find that the lithium difluorophosphate (LiPO 2 F 2 , LiDFP) additive shows some special properties, which greatly improve the reversible capacity in the first discharge. The silicon nanoparticles can deliver an ICE of 70.6 % with 2 wt% LiDFP in the electrolyte, which is increased by 17.7 % compared with the cell without LiDFP (ca. 52.9 %). By comparing the XPS and NMR results, it appears the LiDFP may reduce the number of lithium ions involved in the SEI reaction in the electrolyte during the first discharge, and thus the ICE can be improved.

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Section: Introductionmentioning

confidence: 99%

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Zhu

Lao

et al. 2020

ChemElectroChem

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“…For composite SiMP/C anodes, the preparation process should meet high yields and low energy consumption to further achieve large-scale application. Ball milling and spray drying are considered low-cost and effective methods for producing Si-based anodes [52,[94][95][96]. In this regard, scalable synthesis of Si-graphite microspheres was achieved through a simple two-step mechanical strategy of bead grinding and spray drying (Fig.…”

Section: Si/c Compositesmentioning

confidence: 99%

The pursuit of commercial silicon-based microparticle anodes for advanced lithium-ion batteries: A review

Liu

et al. 2022

Nano Research Energy

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Silicon (Si) is one of the most promising anode materials for high-energy lithium-ion batteries. However, the widespread application of Si-based anodes is inhibited by large volume change, unstable solid electrolyte interphase, and poor electrical conductivity. During the past decade, significant efforts have been made to overcome these major challenges toward industrial applications. This review summarizes the recent development of microscale Si-based electrodes fabricated by Si microparticles or other industrial bulk materials from the perspective of industrialization. First, the challenges for microscale Si anodes are clarified. Second, structural design strategies of stable micro-sized Si materials are discussed. Third, other critical practical metrics, such as robust binder construction and electrolyte design, are also highlighted. Finally, future trends and perspectives on the commercialization of Si-based anodes are provided. KEYWORDSsilicon, micro-sized particles, lithium-ion batteries, porous structures, polymer binder, electrolyte design Figure 1 Overview of Si-based anodes for LIBs: (a) merits and (b) fundamental challenges. Reproduced with permission from Ref. [16], © Wiley-VCH GmbH 2021.

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“…Make the material have enough interstitial space to buffer the volume expansion of silicon . The Si‐carbon nanotube (CNT) spheres obtained by rotary spray drying is showed reversible capacity of 2500 mA h g −1 with retention of 98% during 500 cycles …”

Section: Silicon‐based Composite Materialsmentioning

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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A micro-sized Si–CNT anode for practical application via a one-step, low-cost and green method

Abstract: Silicon (Si) has been used in Li-ion batteries (LIBs), and considerable progress has been achieved in design and engineering with improved capacity and cycling.

Cited by 12 publications

References 47 publications

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

Lithium Difluorophosphate as an Effective Additive for Improving the Initial Coulombic Efficiency of a Silicon Anode

The pursuit of commercial silicon-based microparticle anodes for advanced lithium-ion batteries: A review

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

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