阳极
材料科学
复合数
三元运算
化学工程
无定形固体
假电容
锂(药物)
电化学
电极
复合材料
超级电容器
化学
医学
有机化学
物理化学
计算机科学
工程类
程序设计语言
内分泌学
作者
Savithri Vishwanathan,Sreejesh Moolayadukkam,Vijaya Kumar Gangaiah,H. S. S. Ramakrishna Matte
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2023-01-24
卷期号:6 (3): 2022-2030
被引量:11
标识
DOI:10.1021/acsaem.2c03953
摘要
The development of high-capacity anodes that are stable at high rates is of immediate interest as a potential alternative to the commercial graphite anode in lithium-ion batteries (LIBs). Conversion-based transition metal oxides, known for their high theoretical capacities, have been extensively studied in this regard. In this work, a ternary FeOOH-rGO-MnO2 composite has been suitably designed to address the limitations of the bare FeOOH anode arising from poor conductivity and volume expansion. A simple low-temperature synthesis method was employed to obtain a uniform distribution of FeOOH nanorods over the rGO matrix, which was further modified with a buffer layer of amorphous MnO2 nanosheets. While cycling at high rates, the modified composite anode delivered capacities of 956, 842, and 688 mAh g–1 at 1, 2, and 5 A g–1, respectively, for 200 cycles along with a cycling stability of 900 mAh g–1 at 1 A g–1 for 100 cycles. Various electrochemical techniques were used to analyze the superior performance of the ternary composite anode. The carbon matrix effectively provides favorable pathways for electron conduction and aids in the stable SEI formation, while the amorphous MnO2 sustains the structural integrity of the electrode by controlling volume expansion. Further, the exceptional stability of the anode at high rates was attributed to the marked increase in capacitive contribution in the FeOOH-rGO-MnO2 ternary composite anode, paving the way for faster electrode kinetics.
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