Liu Xuelian, Zong Quan, Chen Keyi, Liu Chaofeng, Ye Yongchun, Kang Qiaoling, Zhang Jingji, Zhang Qilong, Jin Chenbin, Cao Guozhong
College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, Zhejiang, People's Republic of China.
College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, Zhejiang, People's Republic of China; State Key Lab of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310027, Zhejiang, People's Republic of China.
J Colloid Interface Sci. 2025 Sep 2;702(Pt 1):138867. doi: 10.1016/j.jcis.2025.138867.
Pre-intercalation has emerged as a highly effective strategy to enhance structural integrity and ion transport kinetics in cathodes for aqueous Zn-ion batteries. Here, we report a zinc-ion pre-intercalated hydrate vanadium oxide cathode, in which the initial insertion of Zn induces a significant expansion of the interplanar spacing, followed by contraction at higher Zn concentrations owing to strong electrostatic interactions with the VO framework. Such competing expansion and contraction of interplanar spacing enhances the overall electrochemical properties. In addition, the pre-intercalated Zn facilitates the in situ formation of a Zn(OH)VO·2HO cathode-electrolyte interphase (CEI) layer, which not only suppresses vanadium dissolution but also regulates the desolvation of hydrated Zn, thus further enhancing the structural integrity and interfacial kinetics. Benefiting from these merits, the Zn pre-intercalated hydrate vanadium pentoxide (denoted as 2Zn-VOH) cathode delivers a high capacity of 395 mA h g at 0.1 A g, exhibits excellent cycling stability at both low and high current densities, and retains outstanding performance under low-temperature conditions (295 mAh g at 0.1 A g and - 10 °C, with 83.8 % capacity retention after 1000 cycles at 0.2 A g).
预嵌入已成为一种高效策略，可增强水系锌离子电池阴极的结构完整性和离子传输动力学。在此，我们报道了一种锌离子预嵌入的水合氧化钒阴极，其中锌的初始嵌入会导致面间距显著扩大，随后由于与VO骨架的强静电相互作用，在较高锌浓度下会发生收缩。这种面间距的竞争性扩大和收缩增强了整体电化学性能。此外，预嵌入的锌促进了原位形成Zn(OH)VO·2H₂O阴极电解质界面（CEI）层，这不仅抑制了钒的溶解，还调节了水合锌的去溶剂化，从而进一步增强了结构完整性和界面动力学。得益于这些优点，锌预嵌入的水合五氧化二钒（记为2Zn-VOH）阴极在0.1 A g时具有395 mA h g的高容量，在低电流密度和高电流密度下均表现出优异的循环稳定性，并且在低温条件下（-10°C，0.1 A g时为295 mAh g，在0.2 A g下1000次循环后容量保持率为83.8%）仍保持出色性能。
