Si Guangquan, Li Wei, Li Taijiang, Wang Caixia, Sun Qi
Huaneng Power International, Inc. Beijing 100031 China
Xi'an Thermal Power Research Institute Co., Ltd. Xi'an 710054 China.
RSC Adv. 2024 Jul 8;14(30):21375-21382. doi: 10.1039/d4ra02815e. eCollection 2024 Jul 5.
The distinctive configuration of MnO renders it an exceptionally promising candidate for cathode materials for aqueous zinc-ion batteries (ZIBs). However, its practical utilization is constrained by the sluggish diffusion kinetics of Zn and the capacity degradation resulting from lattice distortions occurring during charge and discharge cycles. To address these challenges, NaMnO@MXene with a typical 2 × 4 tunnel structure has been successfully synthesized by a simple hydrothermal method in the presence of 5 M NaCl. The nanorods are about 56 nm in diameter. The zinc-ion batteries (ZIBs) with NaMnO@MXene displays a specific capacity of 324.6 mA h g at 0.2 A g, and have a high reversible capacity of 153.8 mA h g after 1000 charge-discharge cycles at 2 A g with a capacity retention of 91.4%. The unique morphology endows abundant electrochemical active sites and facile ion diffusion kinetics, that contribute to the high specific capacity and stability. The NaMnO@MXene with a 2 × 4 tunnel structure is a promising candidate as an electrode material for ZIBs.
MnO独特的结构使其成为水系锌离子电池（ZIBs）正极材料极具潜力的候选者。然而，其实际应用受到锌扩散动力学缓慢以及充放电循环过程中晶格畸变导致的容量衰减的限制。为应对这些挑战，通过在5 M NaCl存在下的简单水热法成功合成了具有典型2×4隧道结构的NaMnO@MXene。纳米棒直径约为56 nm。具有NaMnO@MXene的锌离子电池（ZIBs）在0.2 A g下的比容量为324.6 mA h g，在2 A g下经过1000次充放电循环后具有153.8 mA h g的高可逆容量，容量保持率为91.4%。独特的形态赋予了丰富的电化学活性位点和便捷的离子扩散动力学，这有助于实现高比容量和稳定性。具有2×4隧道结构的NaMnO@MXene是一种很有前景的ZIBs电极材料候选者。
