Pore structure and oxygen content design of amorphous carbon toward a durable anode for potassium/sodium-ion batteries

IF 19.5 1区 材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Energy Pub Date : 2024-03-29 DOI:10.1002/cey2.534
Xiaodong Shi, Chuancong Zhou, Yuxin Gao, Jinlin Yang, Yu Xie, Suyang Feng, Jie Zhang, Jing Li, Xinlong Tian, Hui Zhang
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Abstract

Both sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are considered as promising candidates in grid-level energy storage devices. Unfortunately, the larger ionic radii of K+ and Na+ induce poor diffusion kinetics and cycling stability of carbon anode materials. Pore structure regulation is an ideal strategy to promote the diffusion kinetics and cyclic stability of carbon materials by facilitating electrolyte infiltration, increasing the transport channels, and alleviating the volume change. However, traditional pore-forming agent-assisted methods considerably increase the difficulty of synthesis and limit practical applications of porous carbon materials. Herein, porous carbon materials (Ca-PC/Na-PC/K-PC) with different pore structures have been prepared with gluconates as the precursors, and the amorphous structure, abundant micropores, and oxygen-doping active sites endow the Ca-PC anode with excellent potassium and sodium storage performance. For PIBs, the capacitive contribution ratio of Ca-PC is 82% at 5.0 mV s−1 due to the introduction of micropores and high oxygen-doping content, while a high reversible capacity of 121.4 mAh g−1 can be reached at 5 A g−1 after 2000 cycles. For SIBs, stable sodium storage capacity of 101.4 mAh g−1 can be achieved at 2 A g−1 after 8000 cycles with a very low decay rate of 0.65% for per cycle. This work may provide an avenue for the application of porous carbon materials in the energy storage field.

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设计无定形碳的孔隙结构和含氧量,使其成为钾/钠离子电池的耐用阳极
钠离子电池(SIBs)和钾离子电池(PIBs)都被认为是电网级储能设备的理想候选材料。遗憾的是,K+ 和 Na+ 的离子半径较大,导致碳负极材料的扩散动力学和循环稳定性较差。孔隙结构调整是促进电解质渗透、增加传输通道和缓解体积变化,从而提高碳材料扩散动力学和循环稳定性的理想策略。然而,传统的孔隙形成剂辅助方法大大增加了合成难度,限制了多孔碳材料的实际应用。本文以葡萄糖酸盐为前驱体,制备了具有不同孔隙结构的多孔碳材料(Ca-PC/Na-PC/K-PC),其非晶结构、丰富的微孔和掺氧活性位点赋予了 Ca-PC 阳极优异的钾钠存储性能。对于 PIB,由于引入了微孔和高掺氧含量,Ca-PC 在 5.0 mV s-1 时的电容贡献率为 82%,而在 5 A g-1 条件下,循环 2000 次后可达到 121.4 mAh g-1 的高可逆容量。就 SIB 而言,经过 8000 次循环后,在 2 A g-1 的条件下可实现 101.4 mAh g-1 的稳定钠存储容量,而且每次循环的衰减率非常低,仅为 0.65%。这项研究为多孔碳材料在储能领域的应用提供了一条途径。
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来源期刊
Carbon Energy
Carbon Energy Multiple-
CiteScore
25.70
自引率
10.70%
发文量
116
审稿时长
4 weeks
期刊介绍: Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.
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