Статья

Effective binding sufficiently-small SiO2 nanoparticles within carbon nanosheets framework enables a high-performing and durable anode for lithium-ion batteries

Zhefei SunState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaZhiwen ZhangState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaShenghui ZhouState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaWeicheng LiuKey Laboratory of Advanced Metallic Materials of Jiangsu Province, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, ChinaJianhui LiuState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaQuanzhi YinState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaJianhai PanState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaXiaoyu WuState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaZilong ZhuangDepartment of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USADong-Liang PengState Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, Fujian, ChinaQiaobao ZhangLongmen Laboratory, Luoyang 471023, Henan, China

2025en

ABI

Аннотация

Silica (SiO 2 ), with its high theoretical capacity and abundance, holds great potential as anode material for lithium-ion batteries (LIBs). However, its practical application is hindered by inherently low conductivity and significant volume change during cycling. In this work, we present a simple yet effective strategy to address these challenges by homogeneously binding high-density, ultra-small SiO 2 nanoparticles within a carbon nanosheet framework (denoted as SiO 2 @CNS). In this design, densely packed sufficiently-small SiO 2 nanoparticles (about 6 nm) ensure high electrochemical reactivity, while the conductive and flexible CNS matrix facilitates rapid ion/electron transfer and buffers volume changes during cycling. As a result, the SiO 2 @CNS anode delivers a remarkable capacity of 607.3 mA⸱h/g after 200 cycles at 0.1 A/g, superior rate capability (407.4 mA⸱h/g at 2 A/g) and outstanding durability, retaining 93.1% of its capacity after 2000 cycles at 1 A/g. In-situ transmission electron microscopy and ex-situ microscopic and spectroscopic analyses reveal moderate volume variation and exceptional structural stability during cycling, supported by the formation of a robust solid-electrolyte interphase that underpins its long-lasting performance. Full cells paired with commercial LiFePO 4 cathode exhibit outstanding rate and cycling performance. This work provides valuable insights into developing highly-efficient SiO 2 -based anodes for high-performance LIBs. • Densely packed small SiO 2 nanoparticles embedded in carbon nanosheets (SiO 2 @CNS) has been successfully fabricated. • CNS framework enhances the ion/electron conduction and stability of SiO 2 @CNS composite. • Resultant SiO 2 @CNS anode shows outstanding structural stability during long-term cycling. • Mechanistic reasons driving the enhanced performance of SiO 2 @CNS anode are carefully revealed.

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Идентификаторы

DOI: 10.1016/j.jmat.2025.101053

Цитирования и источники

Цитирований: 2Использованных источников: 0

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