为锂离子电容器选择高倍率能力和循环稳定性 MnO 负极材料:碳源的影响

IF 4.1 3区 化学 Q1 CHEMISTRY, ANALYTICAL
Jialing Ma , Huanqiao Song , Zhihong He , Yu Chen , Mingsheng Luo
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引用次数: 0

摘要

以 K2MnO4 为锰源,CH4N2O 为氮源,葡萄糖、蔗糖或还原氧化石墨烯为碳源,成功制备了掺杂氮的碳修饰氧化锰复合材料。其中,以葡萄糖为碳源制备的复合材料(MPN)表现出优异的电化学性能,这归功于其相对较小的粒径(6.4 nm)、199.4 m2-g-1 的高比表面积以及 0.86 的高内径/内径比。MPN 中的 MnO 含有大量 Mn3+(16.8%),这是由于合成过程中高价 Mn 未完全还原所致。随着 Mn3+ 的形成,产生了大量阳离子空位,使 Li+ 的扩散系数从 2.12 × 10-14 cm2 s -1 增加到 5.94 × 10-13 cm2 s-1。适当厚度的碳层、掺杂的 N 和适合电解质传输的介孔结构为 MnO 提供了快速的离子/电子传输通道,并确保了电化学反应中稳定的界面结构。因此,MPN 阳极材料表现出显著的高电流放电容量(在 2 A-g-1 的高电流密度下为 769.5 mAh-g-1)和优异的循环性能(在 1 A-g-1 下循环 200 次后为 882.2 mAh-g-1),表明其具有优异的速率性能和循环稳定性。此外,以 MPN 为阳极、活性炭为阴极构建的锂离子电容器显示出 190 Wh-kg-1 的高比能量和 205.3 W-kg-1 的高比功率,并且循环寿命长达 3000 次而无明显降解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Selection of high rate capability and cycling stability MnO anode material for lithium-ion capacitors: Effect of the carbon source
The N-doped carbon modified MnO composites were successfully prepared using K2MnO4 as the manganese source, CH4N2O as the nitrogen source, and glucose, sucrose, or reduced graphene oxide as the carbon sources. Among them, the composite (MPN) prepared using glucose as the carbon source exhibited excellent electrochemical performance, attributed to its relatively small particle size (6.4 nm), high specific surface area of 199.4 m2·g−1, and a high ID/IG ratio of 0.86. The MnO in MPN contained a significant amount of Mn3+, ∼16.8 %, which is ascribed to the incomplete reduction of high valence Mn during the process of synthesis. With the formation of Mn3+, a large number of cationic vacancies were generated, which increased the diffusion coefficient of Li+ from 2.12 × 10−14 cm2 s −1 to 5.94 × 10−13 cm2 s−1. The carbon layer with appropriate thickness, doped N and mesoporous structure suitable for electrolyte transport provide a fast ion/electron transport channels for MnO, and ensure a stable interface structure in the electrochemical reactions. Consequently, the MPN anode material exhibited remarkable high current discharge capacity (769.5 mAh·g−1 at a high current density of 2 A·g−1) and excellent cycling performance (882.2 mAh·g−1 after 200 cycles at 1 A·g−1), indicating its exceptional rate performance and cycle stability. Furthermore, the lithium ion capacitor constructed with MPN as anode and activated carbon as cathode demonstrated a high specific energy of 190 Wh·kg−1, a high specific power of 205.3 W·kg−1, and an impressive cycling lifespan of up to 3000 cycles without obvious degradation.
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来源期刊
CiteScore
7.80
自引率
6.70%
发文量
912
审稿时长
2.4 months
期刊介绍: The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
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