Ying Wang, Ming Zhang, Lei Chen, Yanjuan Li, Qingqing Wang, Xiaobin Wu, Lingdi Shen, Xiao Yan
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The distinctive architecture of CoSe<sub>2</sub>@NC/CFs ensures an increased number of active sites, elevated electronic conductivity, alleviated volume expansion, and accelerated reaction kinetics. Consequently, the CoSe<sub>2</sub>@NC/CFs exhibits remarkable cycling performance and exceptional rate capability. Operating at a current density of 1000 mA g<sup>−1</sup>, the CoSe<sub>2</sub>@NC/CFs anode sustains a capacity of 664 mA h g<sup>−1</sup> with no obvious capacity decay over 500 cycles. Even at a high current density of 5000 mA g<sup>−1</sup>, it maintains a capacity of 445 mA h g<sup>−1</sup> with a mere 0.02 % capacity decay per cycle. 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引用次数: 0
摘要
硒化钴(CoSe2)因其理论容量高、成本效益高而成为一种极具潜力的锂离子电池(LIB)正极材料。尽管具有这些优点,但其实际应用却面临着巨大的体积波动和有限的电子导电性带来的挑战。为了解决这些问题,我们采用原位约束法成功合成了一种梅花状结构的 CoSe2@N 掺杂碳,它嵌入一维 N 掺杂碳纤维(CoSe2@NC/CFs)中。清晰的 CoSe2@NC 纳米颗粒均匀地分散在碳纤维的内外表面,直径在 20 ∼ 30 nm 之间。CoSe2@NC/CFs 的独特结构确保了活性位点数量的增加、电子传导性的提高、体积膨胀的缓解以及反应动力学的加速。因此,CoSe2@NC/CFs 具有显著的循环性能和优异的速率能力。在 1000 mA g-1 的电流密度下工作时,CoSe2@NC/CFs 阳极可维持 664 mA h g-1 的容量,并且在 500 次循环中没有明显的容量衰减。即使在 5000 mA g-1 的高电流密度下,它也能保持 445 mA h g-1 的容量,每个周期的容量衰减仅为 0.02%。这项研究介绍了一种新颖的负极材料设计方法,展示了锂离子电池技术的重大进步。
Construction of plum-branch-like CoSe2@N-Doped carbon/carbon fiber with dual protective mechanisms for enhanced lithium storage
Cobalt selenide (CoSe2) emerges as a highly promising anode material for lithium-ion batteries (LIBs) owing to its high theoretical capacity and cost-effectiveness. Despite these merits, its practical utilization faces challenges stemming from substantial volume fluctuations and limited electronic conductivity. To tackle these issues, a plum-branch-like structure of CoSe2@N-doped carbon that embedded in one-dimensional N-doped carbon fibers (CoSe2@NC/CFs), is successfully synthesized through an in-situ confinement method. Well-defined CoSe2@NC nanoparticles, featuring diameters between 20∼30 nm, are uniformly dispersed on both the inner and outer surfaces of the carbon fibers. The distinctive architecture of CoSe2@NC/CFs ensures an increased number of active sites, elevated electronic conductivity, alleviated volume expansion, and accelerated reaction kinetics. Consequently, the CoSe2@NC/CFs exhibits remarkable cycling performance and exceptional rate capability. Operating at a current density of 1000 mA g−1, the CoSe2@NC/CFs anode sustains a capacity of 664 mA h g−1 with no obvious capacity decay over 500 cycles. Even at a high current density of 5000 mA g−1, it maintains a capacity of 445 mA h g−1 with a mere 0.02 % capacity decay per cycle. This study introduces a novel approach to anode material design, showcasing significant advancements in lithium-ion battery technology.
期刊介绍:
Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings.
As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.