将均匀的分子级碳精确集成到多孔二氧化硅框架中,为高性能锂离子电池提供协同电化学活化功能

IF 10.7 Q1 CHEMISTRY, PHYSICAL EcoMat Pub Date : 2024-06-12 DOI:10.1002/eom2.12469
Seungbae Oh, Xue Dong, Chaeheon Woo, Xiaojie Zhang, Yeongjin Kim, Kyung Hwan Choi, Bom Lee, Ji-Hee Kim, Jinsu Kang, Hyeon-Seok Bang, Jiho Jeon, Hyung-Suk Oh, Hak Ki Yu, Junyoung Mun, Jae-Young Choi
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引用次数: 0

摘要

开发可提供高比容量和稳定循环性能的先进锂离子电池负极材料至关重要。本研究提出了一种新方法,用于合成分子级同质碳与多孔二氧化硅纳米颗粒(SiO2@C NPs)的整合,以提高其在锂离子电池负极中的电化学活性。通过改变溶胶-凝胶反应前驱体(苯基三甲氧基硅烷(PTMS)和四乙氧基硅烷(TEOS))的比例,可以精确控制 SiO2@C NPs 中的碳含量和孔隙率。当 PTMS 和 TEOS 的比例为 4:6 时,SiO2@C NPs 呈现出具有薄碳和部分还原 SiOx 相的高度介孔结构,从而平衡了 SiO2@C NPs 电化学活化过程中的离子和电荷转移,使其具有显著的容量和循环性能。这项研究为制备经济实惠、电化学性能更强的高容量 SiO2 基先进正极材料提供了一种新策略。
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Precision integration of uniform molecular-level carbon into porous silica framework for synergistic electrochemical activation in high-performance lithium–ion batteries

The development of advanced anode materials for lithium-ion batteries that can provide high specific capacity and stable cycle performance is of paramount importance. This study presents a novel approach for synthesizing molecular-level homogeneous carbon integration to porous SiO2 nanoparticles (SiO2@C NPs) tailored to enhance their electrochemical activities for lithium-ion battery anode. By varying the ratio of the precursors for sol–gel reaction of (phenyltrimethoxysilane (PTMS) and tetraethoxysilane (TEOS)), the carbon content and porosity within SiO2@C NPs is precisely controlled. With a 4:6 PTMS and TEOS ratio, the SiO2@C NPs exhibit a highly mesoporous structure with thin carbon and the partially reduced SiOx phases, which balances ion and charge transfer for electrochemical activation of SiO2@C NPs resulting remarkable capacity and cycle performance. This study offers a novel strategy for preparing affordable high capacity SiO2-based advanced anode materials with enhanced electrochemical performances.

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17.30
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