Boosting fast electrode reaction kinetics of silicon suboxide anodes by fluoroethylene carbonate-based electrolyte

Yang, Yaozong; Li, Zhaolin; Xu, Yuesong; Zhang, Yang; Wang, Jie; Xu, Hong; He, Xiangming; Zhao, Hailei

doi:10.1016/j.jpowsour.2023.233261

Cited by 7 publications

(8 citation statements)

References 39 publications

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“…The GCD curves (Figure d) exhibit similar activation characteristics, as shown in Figure d and Figure S4a–c. Importantly, the charge specific capacity of the second cycle was lower than that of the 10th cycle, and the specific charge capacity from the second to 10th (Figure S4d–h) shows that all samples undergo an activation process, which is attributed to the slow activation of the anode material . The ICE of electrodes with different Ti contents is compared in Figure e, with values of 82.3, 81.3, and 80.5% for Si 1/3 TiAl 0.36 , Si 1/4 TiAl 0.36 , and Si 1/5 TiAl 0.36 , respectively.…”

Section: Resultsmentioning

confidence: 98%

“…Importantly, the charge specific capacity of the second cycle was lower than that of the 10th cycle, and the specific charge capacity from the second to 10th (Figure S4d− h) shows that all samples undergo an activation process, which is attributed to the slow activation of the anode material. 51 The ICE of electrodes with different Ti contents is compared in Figure 5e, with values of 82.3, 81.3, and 80.5% for Si 1/3 TiAl 0.36 , Si 1/4 TiAl 0.36 , and Si 1/5 TiAl 0.36 , respectively. It is to be noted that a slight decrease in ICE is observed with an increase in TBFS proportion, which may be attributed to impurities introduced during the calcination process.…”

Section: Resultsmentioning

confidence: 99%

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Scalable Synthesis of a Porous Micro Si/Si-Ti Alloy Anode for Lithium-Ion Battery from Recovery of Titanium-Blast Furnace Slag

Liu,

Zhong,

Zeng

et al. 2023

ACS Appl. Mater. Interfaces

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The extensive utilization of Si-anode-based lithium-ion batteries faces obstacles due to their substantial volume expansion, limited intrinsic conductivity, and low initial Coulombic efficiency (ICE). In this study, we present a straightforward, cost-effective, yet scalable method for producing a porous micro Si/Si-Ti alloy anode. This method utilizes titanium-blast furnace slag (TBFS) as a raw material and combines aluminothermic reduction with acid etching. By adjusting the Al:TBFS ratio, the specific surface area of the material can be facilely tailored, ranging from 25.89 to 43.23 m 2 g −1 , enhancing the ICE from 78.2 to 85.5%. The incorporation of the Si-Ti alloy skeleton and porous structure contributes to the enhanced cyclic stability (capacity retention from 50.7 to 96.9%) and conductivity (R ct from 107.7 to 76.6 Ω). The Si/Si-Ti anode exhibits excellent electrochemical performance, including delivering a specific capacity of 1161 mAh g −1 at 200 mA g −1 after 200 cycles and 1112 mAh g −1 at 500 mA g −1 after 100 cycles, with an improved ICE of 81.2%. This study introduces a successful methodology for designing novel Si anodes from recycling waste materials, providing valuable insights for future advancements in this area.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Scalable Synthesis of a Porous Micro Si/Si-Ti Alloy Anode for Lithium-Ion Battery from Recovery of Titanium-Blast Furnace Slag

Liu,

Zhong,

Zeng

et al. 2023

ACS Appl. Mater. Interfaces

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“…Such configuration would facilitate the Li + -desolvation process and induce more anions and FEC preferentially to be reduced on the anode during discharging. 44 The electrochemical stability of the graphite anode in the above ether-based electrolytes was systematically studied, and the reversibility of Li + insertion/extraction processes in Li|| graphite cell was first evaluated. As shown in Figure 2d, an inferior reversibility was observed with a low discharge capacity (243 mAh/g) and ultralow initial Coulombic efficiency (ICE, 42.8%) in the DME electrolyte.…”

Section: Resultsmentioning

confidence: 99%

A Fully Methylated Cyclic Ether Solvent Enables Graphite Anode Cycling at Low Temperatures

Ma,

Huang,

Xue

et al. 2024

ACS Appl. Mater. Interfaces

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Graphite anode suffers from great capacity loss and larger cell polarization under low-temperature conditions in lithiumion batteries (LIBs), which are mainly caused by the high energy barrier for the Li + desolvation process and sluggish Li + transfer rate across the solid electrolyte interface (SEI). Regulating an electrolyte with an anion-dominated solvation structure could synchronously stabilize the interface and boost the reaction kinetics of the graphite anode. Herein, a highly ionic conductive electrolyte consisting of a fully methylated cyclic ether solvent of 2,2,4,4,5,5-hexamethyl-1,3dioxolane (HMD) and fluoroethylene carbonate (FEC) cosolvent was designed. The high electron-donating effect and steric hindrance of −(CH 3 ) 2 in HMD endow the HMD-based electrolyte with high ionic conductivity but lower coordination numbers with Li + , and an anion-dominated solvation structure was formed. Such configuration can accelerate the desolvation process and induce the forming of a LiF-rich SEI film on the anode, avoiding the solvent coembedding into graphite and enhancing the ion migration rate under low temperatures. The assembled Li||graphite cell with the tame electrolyte outperformed the conventional carbonates-based cell, showing 93.8% capacity retention after 227 cycles for the DFbased cell compared to 64.7% after 150 cycles. It also exhibited a prolonged cycle life for 200 rounds with 81% capacity retention under −20 °C. Therefore, this work offers a valuable thought for solvent design and provides approaches to electrolyte design for low-temperature LIBs.

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“…It is well known that significant volume expansion (approximately 200%) during repeated lithiation/delithiation processes inevitably leads to electrode pulverization and cracking, 11,64,65 resulting in the formation of a new solid electrolyte interphase (SEI) layer on SiO. Fig.…”

Section: Resultsmentioning

confidence: 99%

A highly conductive and robust micrometre-sized SiO anode enabled by an in situ grown CNT network with a safe petroleum ether carbon source

Duan,

Yu,

Liu

et al. 2024

Phys. Chem. Chem. Phys.

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Boosting fast electrode reaction kinetics of silicon suboxide anodes by fluoroethylene carbonate-based electrolyte

Cited by 7 publications

References 39 publications

Scalable Synthesis of a Porous Micro Si/Si-Ti Alloy Anode for Lithium-Ion Battery from Recovery of Titanium-Blast Furnace Slag

Scalable Synthesis of a Porous Micro Si/Si-Ti Alloy Anode for Lithium-Ion Battery from Recovery of Titanium-Blast Furnace Slag

A Fully Methylated Cyclic Ether Solvent Enables Graphite Anode Cycling at Low Temperatures

A highly conductive and robust micrometre-sized SiO anode enabled by an in situ grown CNT network with a safe petroleum ether carbon source

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