Jae Seo Park, Yeon Jeong Jeong, Dong Yoon Park, Hyunji Shin, Da Hee Jang, So Eun Kim, Jeong Heon Ryu, Seo Mi Yang, Jang-Yul Kim, Jae Ho Kim, Seung Jae Yang
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引用次数: 0
Abstract
Mesocrystals are macroscopic structures formed by the assembly of nanoparticles that possess distinct surface structures and collective properties when compared to traditional crystalline materials. Various growth mechanisms and their unique features have promise as material design tools for diverse potential applications. This paper presents a straightforward method for metal–organic coordination-based mesocrystals using nickel ions and terephthalic acid. The coordinative compound between Ni2+ and terephthalic acid drives the particle-mediated growth mechanism, resulting in the mesocrystal formation through a mesoscale assembly. Subsequent carbonization converts mesocrystals to multidirectional interconnected graphite nanospheres along the macroscopic framework while preserving the original structure of the Ni-terephthalic acid mesocrystal. Comprehensive investigations demonstrate that multi-oriented edge sites and high crystallinity with larger interlayer spacing facilitate lithium ion transport and continuous intercalation. The resulting graphitic superparticle electrodes show superior rate capability (128.6 mAh g−1 at 5 A g−1) and stable cycle stability (0.052% of capacity decay per cycle), certifying it as an advanced anode material for lithium-ion batteries.
介晶是由纳米粒子组装形成的宏观结构,与传统晶体材料相比,它具有独特的表面结构和集合特性。各种生长机制及其独特特性有望成为材料设计工具,用于各种潜在应用。本文介绍了一种利用镍离子和对苯二甲酸直接制备金属有机配位介晶的方法。Ni2+ 和对苯二甲酸之间的配位化合物驱动了粒子介导的生长机制,通过中尺度组装形成介晶。随后的碳化将介晶沿宏观框架转化为多向互连的石墨纳米球,同时保留了镍对苯二甲酸介晶的原始结构。综合研究表明,多方向边缘位点和较高的结晶度以及较大的层间距有利于锂离子传输和连续插层。由此产生的石墨超微粒电极显示出卓越的速率能力(5 A g-1 时为 128.6 mAh g-1)和稳定的循环稳定性(每循环容量衰减 0.052%),证明它是一种先进的锂离子电池负极材料。
期刊介绍:
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.