Liu Dan, Zeng Yinxiang, Xu Yue, Liu Qiang, Luan Deyan, Guo Yan, Gu Xiaojun
School of Chemistry and Chemical Engineering, Inner Mongolia Key Laboratory of Low Carbon Catalysis, Inner Mongolia University, Hohhot, 010021, China.
Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China.
Adv Sci (Weinh). 2025 Sep;12(34):e05993. doi: 10.1002/advs.202505993. Epub 2025 Jun 11.
The development of suitable cathode materials is a major scientific challenge for aqueous Zn-ion batteries (AZIBs). Although vanadium oxides have demonstrated encouraging results, challenges such as sluggish reaction kinetics and severe capacity decay caused by unstable crystal structure and vanadium dissolution still hinder their further application. Herein, Ce-glycerate nanospheres are used as a self-engaged template to construct core-shell nanospheres composed of heterostructured VO-CeVO (denoted as VO-CeVO) by an anion-exchange strategy. The unique heterostructure with abundant active sites, large specific surface area, and core-shell design not only boosts ion/electron migration but also inhibits volume change and vanadium dissolution during the repeated Zn ion insertion/extraction processes, enabling enhanced Zn ion storage performance and structural stability. As expected, the VO-CeVO cathode delivers a high capacity of 346.3 mAh g at 0.5 A g, excellent rate capability (257.0 mAh g at 10 A g), and outstanding cycling performance (over 10 000 cycles).
开发合适的阴极材料是水系锌离子电池（AZIBs）面临的一项重大科学挑战。尽管钒氧化物已展现出令人鼓舞的成果，但诸如反应动力学迟缓以及由不稳定晶体结构和钒溶解导致的严重容量衰减等挑战，仍然阻碍着它们的进一步应用。在此，甘油铈纳米球被用作自参与模板，通过阴离子交换策略构建由异质结构VO-CeVO组成的核壳纳米球（记为VO-CeVO）。这种具有丰富活性位点、大比表面积和核壳设计的独特异质结构，不仅促进了离子/电子迁移，还抑制了在反复的锌离子插入/脱出过程中的体积变化和钒溶解，从而实现了增强的锌离子存储性能和结构稳定性。正如预期的那样，VO-CeVO阴极在0.5 A g下具有346.3 mAh g的高容量、出色的倍率性能（在10 A g下为257.0 mAh g）以及卓越的循环性能（超过10000次循环）。
