Lithium ion batteries with enhanced electrochemical performance by using carbon-coated SiOx/Ag composites as anode material

Ouyang, Puhua; Jin, Congrui; Xu, Guojun; Yang, Xiaodong; Kong, Kaijie; Liu, Bobo; Dan, Jianglei; Yue, Zhihao; Li, Xiaomin; Sun, Fugen; Sun, Xuefeng; Zhou, Lang

doi:10.1016/j.ceramint.2020.08.224

Cited by 20 publications

(5 citation statements)

References 32 publications

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“…The slope of the oblique line in the low-frequency region on the right side of the graph is related to the diffusion rate of lithium ions. The higher the slope of the oblique line is, the faster the diffusion rate of lithium ions in the sample [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Pyrolysis on High-Capacity Si-Based Anode of Lithium Ion Battery with High Coulombic Efficiency and Long Cycling Life

Tzeng

Jhan

2022

Nanomaterials

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We report a facile pyrolysis process for the fabrication of a porous silicon-based anode for lithium-ion battery. Silicon flakes of 100 nm × 800 nm × 800 nm were mixed with equal weight of sodium carboxymethyl cellulose (CMC) and styrene butadiene rubber (SBR) as the binder and the conductivity enhancement additive, Ketjen Black (KB), at the weight ratio of silicon–binder–KB being 70%:20%:10%, respectively. Pyrolysis was carried out at 700 °C in an inert argon environment for one hour. The process converts the binder to graphitic carbon coatings on silicon and a porous carbon structure. The process led to initial coulombic efficiency (ICE) being improved from 67% before pyrolysis to 75% after pyrolysis with the retention of 2.1 mAh/cm2 areal capacity after 100 discharge–charge cycles at 1 A/g rate. The improved ICE and cycling performance are attributed to graphitic coatings, which protect silicon from irreversible reactions with the electrolyte to form compounds such as lithium–silicon–fluoride (Li2SiF6) and the physical integrity and buffer space provided by the porous carbon structure. By eliminating the adverse effects of KB, the anode made with silicon-to-binder weight ratio of 70%:30% exhibited further improvement of the ICE to approximately 90%. This demonstrated that pyrolysis is a facile and promising one-step process for the fabrication of silicon-based anode with high ICE and long cycling life. This is especially true when the amount and choice of conductivity enhancement additive are optimized.

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Section: Resultsmentioning

confidence: 99%

Effects of Pyrolysis on High-Capacity Si-Based Anode of Lithium Ion Battery with High Coulombic Efficiency and Long Cycling Life

Tzeng

Jhan

2022

Nanomaterials

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“…A number of researchers have been making efforts toward the enhancement of battery efficiency [69][70][71][72]. Thus, the key requirements of autonomous systems are at odds with the constraints imposed by the battery drawbacks, such as short lifetime, the need for frequent recharging or replacement, and the release of various toxic chemicals [73][74][75]. Hence, the ambient RFEH system is an emerging technology that allows low-power devices to operate for extended periods, making it a viable alternative to the traditional battery source [76][77][78].…”

Section: Significance Of the Researchmentioning

confidence: 99%

Harvesting Systems for RF Energy: Trends, Challenges, Techniques, and Tradeoffs

et al. 2022

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The RFEH design challenges can be broadly classified into overall radio frequency direct current (RF-to-DC) power conversion efficiency (PCE), form factor, operational bandwidth (BW), and compactness. A detailed overview of the essential components of an RFEH system is presented in this paper. Various design approaches have been proposed for the realization of compact RFEH circuits that contribute immensely to mm-wave rectenna design. Effective mechanisms for configuring the rectenna modules based on the recommended spectrums for the RFEH system were also outlined. This study featured a conceptual viewpoint on design tradeoffs, which were accompanied by profound EH solutions perspectives for wireless power communications. The work covers some challenges attributed to 5G EH in mm-wave rectenna: from a controlled source of communication signals to distributed ambient EH and system level design. Conversely, the primary targets of this work are to: (I) examine a wide range of ambient RF sources and their performance with various antennae and RF-rectifier layouts; (II) propose unique rectenna design techniques suitable for current trends in wireless technology; (III) explore numerous approaches for enhancing the rectenna or RF-rectifier efficiency in a low-power ambient environment; and (IV) present the findings of a comprehensive review of the exemplary research that has been investigated. These are aimed toward addressing the autonomous system’s energy challenges. Therefore, with the careful management of the reported designs, the rectenna systems described in this study would influence the upcoming advancement of the low-power RFEH module.

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“…In order to ease the volume expansion of the silicon anode materials, it can be solved by the following three aspects: (1) the design and modification of the Si materials, mainly including nanocrystallization, carbon coverage, alloying, and SiO x ; − (2) the application of adapted electrolytes and electrode additives; − (3) the design and modification of binders . SiO x (0 < x < 2) is a promising anode material due to not only the higher capacity than graphite but also the lower volume change than silicon. , However, SiO x still has problems such as a large volume expansion, low initial Coulombic efficiency (ICE), and poor electrical conductivity during the cycling process. , One of the simple and low-cost ways to solve this problem is to design and modify the binders. − …”

Section: Introductionmentioning

confidence: 99%

“…18 SiO x (0 < x < 2) is a promising anode material due to not only the higher capacity than graphite but also the lower volume change than silicon. 12,19 However, SiO electrical conductivity during the cycling process. 20,21 One of the simple and low-cost ways to solve this problem is to design and modify the binders.…”

Section: ■ Introductionmentioning

confidence: 99%

In Situ Prepared Three-Dimensional Covalent and Hydrogen Bond Synergistic Binder to Boost the Performance of SiO_x Anodes for Lithium-Ion Batteries

Long

Liao

et al. 2023

ACS Appl. Mater. Interfaces

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Polymer binders play an important role in enhancing the electrochemical performance of silicon-based anodes to alleviate the volume expansion for lithium-ion batteries. It is difficult for common one-dimensional (1D) linear binders to limit the volume expansion of a silicon-based electrode when combined with silicon-based particles with scant binding points. Therefore, it is necessary to design a three-dimensional (3D) network structure, which has multiple binding points with the silicon particles to dissipate the mechanical stress in the continuous charge and discharge circulation. Here, a covalent and hydrogen bond synergist 3D network green binder (poly(acrylic acid) (PAA)−dextrin 9 (Dex 9 )) was prepared by the simple in situ thermal condensation of a onedimensional liner binder PAA and Dex in the electrode fabrication process. The optimized SiO x @PAA-Dex 9 electrode exhibits an initial Coulombic efficiency (ICE) of 82.4% at a current density of 0.2 A g −1 . At a high current density of 1 A g −1 , it retains a capacity of 607 mAh g −1 after 300 cycles, which is approximately twice as high as that of the SiO x @PAA electrode. Furthermore, the results of in situ electrochemical dilatometry (ECD) and characterization of electrode structures demonstrate that the PAA-Dex 9 binder can effectively buffer the huge volume change and maintain the integrity of the SiO x electrodes. The research overcomes the low electrochemical stability difficulty of the 3D binder and sheds light on developing the simple fabrication procedure of an electrode.

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Lithium ion batteries with enhanced electrochemical performance by using carbon-coated SiOx/Ag composites as anode material

Cited by 20 publications

References 32 publications

Effects of Pyrolysis on High-Capacity Si-Based Anode of Lithium Ion Battery with High Coulombic Efficiency and Long Cycling Life

Effects of Pyrolysis on High-Capacity Si-Based Anode of Lithium Ion Battery with High Coulombic Efficiency and Long Cycling Life

Harvesting Systems for RF Energy: Trends, Challenges, Techniques, and Tradeoffs

In Situ Prepared Three-Dimensional Covalent and Hydrogen Bond Synergistic Binder to Boost the Performance of SiO_x Anodes for Lithium-Ion Batteries

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Lithium ion batteries with enhanced electrochemical performance by using carbon-coated SiOx/Ag composites as anode material

Cited by 20 publications

References 32 publications

Effects of Pyrolysis on High-Capacity Si-Based Anode of Lithium Ion Battery with High Coulombic Efficiency and Long Cycling Life

Effects of Pyrolysis on High-Capacity Si-Based Anode of Lithium Ion Battery with High Coulombic Efficiency and Long Cycling Life

Harvesting Systems for RF Energy: Trends, Challenges, Techniques, and Tradeoffs

In Situ Prepared Three-Dimensional Covalent and Hydrogen Bond Synergistic Binder to Boost the Performance of SiOx Anodes for Lithium-Ion Batteries

Contact Info

Product

Resources

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In Situ Prepared Three-Dimensional Covalent and Hydrogen Bond Synergistic Binder to Boost the Performance of SiO_x Anodes for Lithium-Ion Batteries