Synergistic confinement by MOF-derived carbon and MXene in silicon-based anodes enables stable lithium storage

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Wuyang Xiao , Lin Hu , Hui Xu , Yaru Pei , Qinggen Li , Zhong Yang
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引用次数: 0

Abstract

Silicon-based anodes offer high theoretical capacity for lithium-ion batteries but suffer from severe volume expansion during cycling, leading to structural degradation and capacity fade. This study presents a novel Si/SiOx@C@MXene composite to overcome these limitations through the synergistic confinement by the metal-organic-framework (MOF) derived carbon and MXene. The resulted Si/SiOx@C@MXene composite features a unique architecture where MOF-derived carbon-coated Si/SiOx nanospheres are embedded within or anchored onto the conductive MXene sheets, forming a robust three-dimensional sandwich-like structure. Electrochemical test reveal that Si/SiOx@C@MXene delivers a high initial discharge capacity of 1158.0 mAh g−1 at 100 mA g−1, maintains 953.5 mAh g−1 after 1000 cycles at 1000 mA g−1 (84.9 % capacity retention), and exhibits excellent rate capability (543.9 mAh g−1 at 5000 mA g−1). This work highlights the effectiveness approach for developing high-performance, stable silicon-based anodes.

Abstract Image

mof衍生的碳和MXene在硅基阳极中的协同约束可以实现稳定的锂存储
硅基阳极为锂离子电池提供了很高的理论容量,但在循环过程中会出现严重的体积膨胀,导致结构退化和容量衰减。本研究提出了一种新的Si/SiOx@C@MXene复合材料,通过金属有机框架(MOF)衍生的碳和MXene的协同约束来克服这些限制。所得到的Si/SiOx@C@MXene复合材料具有独特的结构,其中mof衍生的碳涂层Si/SiOx纳米球嵌入或固定在导电MXene薄片上,形成坚固的三维三明治状结构。电化学测试表明,Si/SiOx@C@MXene在100 mA g - 1时的初始放电容量为1158.0 mAh g - 1,在1000 mA g - 1下循环1000次后保持953.5 mAh g - 1(84.9%的容量保留率),并表现出优异的倍率能力(543.9 mAh g - 1, 5000 mA g - 1)。这项工作强调了开发高性能、稳定的硅基阳极的有效方法。
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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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