Laser-synthesized metastable bismuth nanocrystals chemically bonded to reduced graphene oxide for excellent lithium storage

IF 7.2 3区材料科学 Q2 Materials Science

New Carbon Materials Pub Date : 2026-04-01 Epub Date: 2026-04-27 DOI:10.1016/S1872-5805(26)61068-2

Yanxia Su , Xiuhai Zhang , Yuqian Qiu , Miaohan Ban , Jinbo Zhang , Chong Li , Fei Xu , Hongqiang Wang

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Abstract

The poor interface contact between Bi nanoparticles and reduced graphene oxide (rGO) hinders the transfer of ions/electrons for lithium-ion batteries. We propose an innovative approach for fabricating ultrafine bismuth nanocrystals chemically bonded to reduced graphene oxide (Bi-rGO) by liquid-phase pulsed laser irradiation followed by a solvothermal reaction with graphene oxide. Metastable Bi nanocrystals synthesized by a laser (5.5 nm) are then combined with graphene oxide in a solvothermal process, undergoing lattice restructuring and shrinking to a record-small size of 2 nm, which is the smallest reported for Bi/C composites as far as we know. The Bi nanocrystals are uniformly anchored onto rGO nanosheets by strong Bi —O —C bonds, which not only suppress particle aggregation but also establish efficient ion/electron transport channels and alleviate volume expansion during lithiation. As a result, the Bi-rGO-2 anode consisting of 2 nm Bi nanocrystals has an exceptional reversible capacity of 586.7 mAh g−1 over 500 cycles under a current density of 100 mA·g−1, nearly doubling that of a Bulk Bi/rGO composite anode (318 mAh·g−1). Theoretical calculations confirm a higher binding energy between Bi and rGO at small particle sizes, while kinetic analysis reveals accelerated Li+ diffusion. This work provides a scalable way to design high-performance alloy anodes through metastable nanocrystal engineering and covalent interface coupling.

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激光合成的亚稳态铋纳米晶体与还原氧化石墨烯化学键合，具有优异的锂存储性能

铋纳米颗粒与还原氧化石墨烯（rGO）之间的界面接触不良，阻碍了锂离子电池中离子/电子的转移。我们提出了一种创新的方法，通过液相脉冲激光照射，然后与氧化石墨烯进行溶剂热反应，制造与还原氧化石墨烯（Bi-rGO）化学结合的超细铋纳米晶体。用激光（5.5 nm）合成亚稳态Bi纳米晶体，然后在溶剂热过程中与氧化石墨烯结合，进行晶格重组并缩小到创纪录的2 nm尺寸，这是迄今为止我们所知道的最小的Bi/C复合材料。Bi纳米晶体通过强Bi -O -C键均匀地固定在氧化石墨烯纳米片上，这不仅抑制了颗粒聚集，而且建立了有效的离子/电子传递通道，减轻了锂化过程中的体积膨胀。结果表明，在100 mA·g−1电流密度下，由2 nm Bi纳米晶体组成的Bi-rGO-2阳极在500次循环中具有586.7 mAh·g−1的卓越可逆容量，几乎是本体Bi/rGO复合阳极（318 mAh·g−1）的两倍。理论计算证实，在小颗粒尺寸下，Bi和rGO之间的结合能更高，而动力学分析表明Li+的扩散加速。这项工作为通过亚稳纳米晶工程和共价界面耦合设计高性能合金阳极提供了一种可扩展的方法。下载：下载高清图片（209KB）下载：下载全尺寸图片

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来源期刊

New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.10

自引率

8.80%

发文量

3245

审稿时长

5.5 months

期刊介绍： New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.