Electrostatic modification of expanded graphite cathode for high-performance aluminum-ion batteries

IF 4.5 3区 化学 Q1 Chemical Engineering Journal of Electroanalytical Chemistry Pub Date : 2023-09-01 DOI:10.1016/j.jelechem.2023.117761
Changsheng An , Xiaobo Ma , Jiajie Wu , Jianmei Li , Jinfeng Li , Shiying Zhang , Shumin Zhang , Chao Cai
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Abstract

Graphite and its derivatives, as cathode materials for aluminum-ion batteries (AIBs), have excellent cyclic properties, so they have garnered significant research interest over the years. Preliminary research has demonstrated that expanded graphite (EG) exhibits a dual aluminum storage mechanism, i.e., intercalation (1.5–2.5 V) and adsorption (0.5–2.5 V). In this study, for the adsorption mechanism, we propose positively charged EG as a cathode material for AIBs. Using electrostatic modification methods, we found that positive charge on the surface of EG can depress the surface barrier and lead to the adsorption of more anions through electrostatic forces during chemical reactions. Moreover, the improvement of adsorption capacity could play a synergistic coupling role to improve the intercalation kinetics of anions, in which has a high reversible capacity and excellent rate cycling property. Thus, positively charged EG with a large layer space (0.41 nm) demonstrates a high reversible capacity of 118.3 mAh/g at a current density of 1 A/g, along with a conspicuous rate performance of 74.8 mAh/g at 15 A/g. Additionally, as-prepared EG hybrids indicate superb cyclic stability with a retained capacity of 101.8 mAh/g over 10,000 cycles at 5 A/g. The electrostatic modification strategy and expansion of the layer space could facilitate the development of high property graphite cathode materials for AIBs.

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高性能铝离子电池用膨胀石墨阴极的静电改性研究
石墨及其衍生物作为铝离子电池的正极材料,具有优良的循环性能,近年来引起了广泛的研究兴趣。初步研究表明,膨胀石墨(EG)具有插层(1.5-2.5 V)和吸附(0.5-2.5 V)的双重储铝机制。在本研究中,我们提出了带正电荷的膨胀石墨作为AIBs的正极材料。利用静电改性方法,我们发现EG表面的正电荷可以在化学反应过程中通过静电力抑制表面势垒,从而吸附更多的阴离子。此外,提高吸附容量可以发挥协同耦合作用,提高阴离子的插层动力学,具有较高的可逆容量和优良的速率循环性能。因此,具有大层空间(0.41 nm)的正电荷EG在电流密度为1 a /g时具有118.3 mAh/g的高可逆容量,同时在15 a /g时具有74.8 mAh/g的显着速率性能。此外,制备的EG混合材料表现出极好的循环稳定性,在5 a /g下,在10,000次循环中保持101.8 mAh/g的容量。静电改性策略和层空间的扩大有利于高性能石墨阴极材料的发展。
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来源期刊
Journal of Electroanalytical Chemistry
Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering
CiteScore
7.50
自引率
6.70%
发文量
912
审稿时长
>12 weeks
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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