Cao Liucheng, Chen Miao, Zhang Yiming, Hu Jingying, Wu Yi, Chen Ying, Wang Ruijia, Yuan Haoyi, Wei Fuxiang, Sui Yanwei, Meng Qingkun, Cheng Lifeng, Wang Shengqi
School of Materials and Physics, China University of Mining & Technology, Xuzhou, 221116, PR China.
School of Materials and Physics, China University of Mining & Technology, Xuzhou, 221116, PR China.
J Colloid Interface Sci. 2024 Oct;671:303-311. doi: 10.1016/j.jcis.2024.05.151. Epub 2024 May 24.
Manganese-based cathodes are competitive candidates for state-of-the-art aqueous zinc-ion batteries (AZIBs) because of their easy preparation method, sufficient nature reserve, and environmental friendliness. However, their poor cycle stability and low rate performance have prevented them from practical applications. In this study, MnO nanoparticles were formed in situ on the surface and between the interlayers of TiCT MXene, which was pretreated by the intercalation of K ions. TiCT MXene not only provides abundant active sites and high conductivity but also hinders the structural damage of MnO during charging and discharging. Benefiting from the well-designed K-TiC@MnO structure, the battery equipped with the K-TiC@MnO cathode achieved a maximum specific capacity of 312 mAh/g at a current density of 0.3 A/g and carried a specific capacity of approximately 120 mAh/g at a current density of 1 A/g, which remained stable for approximately 500 cycles. The performance surpasses that of most reported MnO-based cathodes. This study pioneers a new approach for building better cathode materials for AZIBs.
锰基阴极是先进水系锌离子电池（AZIBs）的有力候选材料，因其制备方法简便、自然储量充足且环境友好。然而，其较差的循环稳定性和低倍率性能阻碍了它们的实际应用。在本研究中，MnO纳米颗粒原位形成于经K离子插层预处理的TiCT MXene的表面和层间。TiCT MXene不仅提供了丰富的活性位点和高导电性，还阻碍了MnO在充放电过程中的结构破坏。得益于精心设计的K-TiC@MnO结构，配备K-TiC@MnO阴极的电池在电流密度为0.3 A/g时实现了312 mAh/g的最大比容量，在电流密度为1 A/g时具有约120 mAh/g的比容量，并在约500次循环中保持稳定。该性能超过了大多数已报道的MnO基阴极。本研究开创了一种构建用于AZIBs的更好阴极材料的新方法。
