A Si@SiOC@Li2Si2O5 anode derived from pyrolysis of polysiloxane enables lithium-ion batteries to exhibit high electrochemical performance and high initial coulombic efficiency

Li, Longsheng; Zhang, Yue; Chen, Wen; Yang, Wei; Zou, Hanbo; Kang, Tianxing; Chen, Shengzhou

doi:10.1039/d4ta01878h

J. Mater. Chem. A

2024

DOI: 10.1039/d4ta01878h

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A Si@SiOC@Li₂Si₂O₅ anode derived from pyrolysis of polysiloxane enables lithium-ion batteries to exhibit high electrochemical performance and high initial coulombic efficiency

Longsheng Li,

Yue Zhang,

Wen Chen

et al.

Abstract: Si is used to synthesize a Si@SiOC@Li2Si2O5 (SSL) anode materials with high specific capacity and high initial coulombic efficiency.

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Cited by 2 publications

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An Effective Strategy on Synthesizing a Stable SiO_x‐Based Anode for High Density Lithium‐Ion Batteries

Tang,

Zhang,

et al. 2024

Chemistry A European J

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Silicon oxides (SiOx) have received extensive attention as an promising anode candidate for next‐generation lithium‐ion batteries (LIBs). However, their commerical applications have been seriously hindered by low conductivity, large volume expansion and unstable soild‐electrolyte interface (SEI) layer, which result in low intial coulombic efficiency, poor rate performance and short cycling lifepan. In this work, we demonstrate a simple way to prepare a series of SiOx materials with lithium fluoride (LiF) modified by hydrothermal method and carbothermal modification. When the mass ratio of SiOx and LiF equals 1:0.15, the long‐term cycling capacity retention can be greatly improve form 30.2% to 76.7% after 200 cycles. The result is primarily because the enhancement of electrons and Li+‐ions transport and the stability of SEI layer due to LiF addition. However, excess LiF addition can hinder the diffusion of Li+‐ions. This study presents the great potential of LiF modified on SiOx anode materials for LIBs.

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An Effective Strategy on Synthesizing a Stable SiO_x‐Based Anode for High Density Lithium‐Ion Batteries

Tang,

Zhang,

et al. 2024

Chemistry A European J

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Fluorine‐Doping Carbon‐Modified Si/SiO_x to Effectively Achieve High‐Performance Anode

You,

Lin,

Zheng

et al. 2024

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To address the significant challenges encountered by silicon‐based anodes in high‐performance lithium‐ion batteries (LIBs), including poor cycling stability, low initial coulombic efficiency (ICE), and insufficient interface compatibility, this work innovatively prepares high‐performance Si/SiOx@F‐C composites via in situ coating fluorine‐doping carbon layer on Si/SiOx surface through high‐temperature pyrolysis. The Si/SiOx@F‐C electrodes exhibit superior LIB performance with a high ICE of 79%, exceeding the 71% and 43% demonstrated by Si/SiOx@C and Si/SiOx, respectively. These electrodes also show excellent rate performance, maintaining a capacity of 603 mAhg−1 even under a high current density of 5000 mAg−1. Notably, the Si/SiOx@F‐C electrode sustains a high reversible capacity of 829 mAh g−1 at 1000 mA g−1 over 1400 cycles, and 588 mAhg−1 at 3000 mAg−1 even over 2400 cycles, capacity retention of up to 82.12%. Comprehensive characterization and analysis of the fluorine‐doped carbon layer reveal its role in enhancing electrical conductivity and preventing structural degradation of the material. The abundant fluorine in the coating layer significantly increases the LiF concentration in the solid electrolyte interface (SEI) film, improving interfacial compatibility and overall lithium storage performance. This method is both straightforward and effective, providing a promising blueprint for the broader application of Si‐based anodes in advanced lithium batteries.

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A Si@SiOC@Li₂Si₂O₅ anode derived from pyrolysis of polysiloxane enables lithium-ion batteries to exhibit high electrochemical performance and high initial coulombic efficiency

Abstract: Si is used to synthesize a Si@SiOC@Li2Si2O5 (SSL) anode materials with high specific capacity and high initial coulombic efficiency.

Cited by 2 publications

References 78 publications

An Effective Strategy on Synthesizing a Stable SiO_x‐Based Anode for High Density Lithium‐Ion Batteries

An Effective Strategy on Synthesizing a Stable SiO_x‐Based Anode for High Density Lithium‐Ion Batteries

Fluorine‐Doping Carbon‐Modified Si/SiO_x to Effectively Achieve High‐Performance Anode

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A Si@SiOC@Li2Si2O5 anode derived from pyrolysis of polysiloxane enables lithium-ion batteries to exhibit high electrochemical performance and high initial coulombic efficiency

Abstract: Si is used to synthesize a Si@SiOC@Li2Si2O5 (SSL) anode materials with high specific capacity and high initial coulombic efficiency.

Cited by 2 publications

References 78 publications

An Effective Strategy on Synthesizing a Stable SiOx‐Based Anode for High Density Lithium‐Ion Batteries

An Effective Strategy on Synthesizing a Stable SiOx‐Based Anode for High Density Lithium‐Ion Batteries

Fluorine‐Doping Carbon‐Modified Si/SiOx to Effectively Achieve High‐Performance Anode

Contact Info

Product

Resources

About

A Si@SiOC@Li₂Si₂O₅ anode derived from pyrolysis of polysiloxane enables lithium-ion batteries to exhibit high electrochemical performance and high initial coulombic efficiency

An Effective Strategy on Synthesizing a Stable SiO_x‐Based Anode for High Density Lithium‐Ion Batteries

An Effective Strategy on Synthesizing a Stable SiO_x‐Based Anode for High Density Lithium‐Ion Batteries

Fluorine‐Doping Carbon‐Modified Si/SiO_x to Effectively Achieve High‐Performance Anode