阳极
材料科学
介孔材料
锂(药物)
合理设计
插层(化学)
纳米技术
电化学
结构稳定性
储能
离子
化学工程
电极
催化作用
化学
无机化学
物理化学
医学
生物化学
功率(物理)
物理
结构工程
量子力学
有机化学
工程类
内分泌学
作者
Deli Li,Jun Liang,Shuang Song,Li Li
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-02-14
卷期号:6 (4): 2356-2365
被引量:1
标识
DOI:10.1021/acsanm.2c04359
摘要
The rational design and engineering of three-dimensional (3D) micro-/nano-architectures still remains a technological challenge for electrochemical energy storage materials. In the current work, a facile and scalable structural engineering strategy is described for the synthesis of highly cross-linked 3D ε-Fe2O3 networks via an in situ manipulation of the molecular framework-engaged reactions. The as-obtained ε-Fe2O3 with a large specific surface area and abundant mesopores possesses a 3D interlocked architecture organized by ultrathin nanosheets. The formation mechanism of this unique structure is explored, which is shown to be Fe(CN)64–-mediated molecular-level template action leading to the self-assembly of a 3D framework. As a conversion-type anode for LIBs, the optimized ε-Fe2O3 networks exhibit a high reversible specific capacity, good rate capability, as well as long-term stability, with a reversible capacity of 953.8 mAh g–1 that is retained beyond 600 cycles at 1.0 A g–1. In addition, the excellent Li storage performance can be ascribed to the microarchitectured ε-Fe2O3 networks, which provide multiscale dimensions, mesoporous structure, some oxygen deficiencies, as well as good structural integrity upon prolonged cycling. Furthermore, the experimental results and DFT calculations showed that ε-Fe2O3 was able to form a key Li5Fe5O8–x phase during the lithiation/delithiation process, in which the structural properties of ε-Fe2O3 inherently favor the intercalation of Li+ ions within ε-Fe2O3, thus leading to the experimentally observed high performance rates.
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