A novel three-dimensional cross-linked net structure of submicron Si as high-performance anode for LIBs

Liang, Junhua; Fan, Zhengqing; Chen, Si; Zheng, Songsheng; Wang, Zhaolin

doi:10.1016/j.jallcom.2020.158433

Cited by 27 publications

(13 citation statements)

References 48 publications

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“…At initial few cycles, the irreversible capacity loss is mainly induced by the volume changes of crystalline Si embedded in SiO x matrix, which allows a continuous formation of SEI layers on the newly exposed surface. 25,32 The reversible capacity of the SiO x -NaCl anode, which was high during the initial cycling, gradually decreased after a few cycles, owing to the irreversible consumption of Li + induced by 25,33 continuous particle pulverization and electrolyte decomposition, until a failure state was reached after 118 cycles. However, stable cyclic performance of up to 200 cycles was achieved for the SiO x -KCl anode, wherein a high reversible capacity of 1052 mAh g À1 and ~89% capacity retention were preserved even after 200 cycles.…”

Section: Resultsmentioning

confidence: 99%

Crystallinity‐controlled SiO _x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Raza

Kim

Choi

et al. 2022

Intl J of Energy Research

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Summary Silicon suboxides (SiOx) are considered potential anode materials for high‐energy lithium‐ion batteries (LIBs) owing to their high specific capacity and stable cycling performance. Several structural parameters, such as chemical composition, particle size, surface area, and crystallinity, affect the electrochemical performance of SiOx. In particular, the crystallinity of the Si embedded in the SiO2 matrix significantly influences the electrochemical performance of SiOx, as it directly affects the structural stability of Si during cycling. To optimize the high‐performance synthesis of SiOx, we conduct a comparative study of the heat absorbents (KCl and NaCl) to demonstrate their critical role in determining the crystallinity of SiOx particles during the magnesiothermic reduction of SiO. The different heat capacities of these absorbents induced distinctive structural evolutions of SiO during the process, affecting the electrochemical behavior of SiOx during cycling. When KCl was present, the resulted substance has a lower crystallinity of Si, thereby offering superior electrochemical performance compared to that in the presence of NaCl. KCl‐SiOx exhibited a high reversible capacity of 1862 mAh g−1 and an initial Coulomb efficiency (ICE) of 83.0%. Moreover, a stable cycle performance of up to 200 cycles and high capacity retention of up to 89.1% at a current density of 750 mA g−1 could be achieved. Therefore, we believe that the results obtained herein will provide a basis for the development of high‐performance SiOx anode materials for commercial applications.

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Section: Resultsmentioning

confidence: 99%

Crystallinity‐controlled SiO _x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Raza

Kim

Choi

et al. 2022

Intl J of Energy Research

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“…另一方面, 从图 1(b)中 Cu 和 Si 原料颗粒样品的 XRD 衍射图谱, 以及与之相对应的 PDF 标准卡片 Cu PDF#04-0836、Si PDF#99-0092 对比可以看出 [27][28] 小表示的是电极界面处的电荷传输阻抗, 半圆直径越小, 电荷转移电阻越小. 从图中可以明显得出其半圆直径约为 60 Ω, 明显小于已报道的 Si@C 负极的电化学交流阻抗值 [29][30][31] . 说明本工作所制备的 Cu 3 Si 负极, 由于 Cu 的加入极大降低了负极材料的电荷转移阻力.…”

Section: 结果与讨论unclassified

Correlation between the Pseudo-Capacitance Behavior and the Second-Order Phase Transition in the Li⁺ Insertion/Desertion in Cu₃Si

Shi¹,

Chen²,

Zheng³

et al. 2021

Acta Chimica Sinica

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Lithium-ion batteries with high energy density have urgent demand, especially in the fields of pure electric vehicles, smart phones, laptops, wind power generation and energy storage. Therefore, more and more attention has been paid on materials with high energy density, rapid charge/discharge capability and long cycle life. In this paper, pure Cu3Si phase was prepared by metallurgical process, and the electrochemical characteristics of the as prepared Cu3Si samples were studied by using CR2025 button half-cell structure with metal lithium sheet as reference electrode and Celgard 2500 as diaphragm. The results showed that, at a current density of 0.1C (420 mA•g-1 ), it possessed a first-cycle discharge specific capacity of 759 mAh•g -1 with a coulomb efficiency of 96.56%. It remained 822 mAh•g -1 after 200 cycles with a capacity retention rate of 98%. It retained 776, 700, 580, 500, 440 and 405 mAh•g -1 at a testing rate of 0.1C, 0.2C, 0.4C, 0.6C, 0.8C and 1C, respectively. The specific capacity was stabilized at around 790 mAh•g -1 when the current density was restored to 0.1C, which did not decrease significantly compared with the initial value. Moreover, the impedance was about 60 Ω, lower than that of the reported Si@C anode. Thus, it suggested that introducing Cu would greatly reduce the charge transfer resistance. It was worth noting that the charge/discharge curve was slope like and had pseudo capacitance characteristics. Furthermore, the cyclic voltammetry (CV) measurement was carried out at scanning rates of 0.1, 0.2, 0.4, 0.6, 0.8 and 1.0 mV/s, respectively. The results discovered for the first time that the as-prepared Cu3Si possessed the characteristic of both battery and capacitance. They together stored the charges, and the capacitance dominated the contribution. Moreover, an clear step could be observed at 550-600 ℃ in the differential scanning calorimetry (DSC) curve of the as-prepared Cu3Si sample after discharged, relating to a change in the specific heat capacity. Moreover, the sample phase did not change before and after the charge/discharge process. Therefore, it was determined that the Li ＋ insertion/desertion process of Cu3Si was not a first-order phase transition but a second-order phase transition process. To be concluded, for Cu3Si anode materials, the redox process was a second-order phase transition, which exhibited a pseudo capacitive behavior in its electrochemical properties.

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“…Several researchers have used various strategies to alleviate the expansion of Si and explore the potential applications of Si-based anode materials. In dimension design, nanostructured Si-based electrodes are prepared with special morphologies, such as nanospheres, nanowires, nanotubes, porous silicon, , which alleviates the volume effect and improves its electron and ion diffusion channels and rate performance. − …”

Section: Introductionmentioning

confidence: 99%

Thermal Burst Synthesis of High-Performance Si Nanotube Sheets for Lithium-Ion Batteries

Guo

Luo

Shi

et al. 2022

ACS Sustainable Chem. Eng.

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One of the drawbacks of Si-based battery anodes is poor cycle stability due to volume expansion of the anode material. To overcome this limitation, we propose a novel strategy of Si nanotube sheet synthesis using the thermal burst method. Herein, SiO 2 nanotubes are prepared using the hard template method; subsequently, Si nanotube sheets are produced during the thermal burst caused by magnesiothermic reduction, which occurs because nanotubes are broken by ZnO with a larger thermal expansion coefficient. The electrochemical test results indicate that the Si nanotube sheets possess excellent electrochemical properties. The discharge specific capacity can reach 712.7 mAh g −1 even at the current density of 5 A g −1 . Moreover, after carbon coating, a discharge capacity of 695.9 mAh g −1 is retained after 400 cycles at 1 A g −1 and the capacity retention of full batteries can reach 81.78% after 50 cycles at a rate of 0.5 C. Thus, the Si-based anode electrode with excellent electrochemical performance can be prepared by the thermal burst process, and this strategy can be applied to the preparation of other anode materials.

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A novel three-dimensional cross-linked net structure of submicron Si as high-performance anode for LIBs

Cited by 27 publications

References 48 publications

Crystallinity‐controlled SiO _x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Crystallinity‐controlled SiO _x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Correlation between the Pseudo-Capacitance Behavior and the Second-Order Phase Transition in the Li⁺ Insertion/Desertion in Cu₃Si

Thermal Burst Synthesis of High-Performance Si Nanotube Sheets for Lithium-Ion Batteries

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A novel three-dimensional cross-linked net structure of submicron Si as high-performance anode for LIBs

Cited by 27 publications

References 48 publications

Crystallinity‐controlled SiO x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Crystallinity‐controlled SiO x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Correlation between the Pseudo-Capacitance Behavior and the Second-Order Phase Transition in the Li+ Insertion/Desertion in Cu3Si

Thermal Burst Synthesis of High-Performance Si Nanotube Sheets for Lithium-Ion Batteries

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Crystallinity‐controlled SiO _x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Crystallinity‐controlled SiO _x anode material prepared through a salt‐assisted magnesiothermic reduction for lithium‐ion batteries

Correlation between the Pseudo-Capacitance Behavior and the Second-Order Phase Transition in the Li⁺ Insertion/Desertion in Cu₃Si