Pan Guangxing, Hu Yuanyuan, Wang Zhenyuan, Li Hao, Wu Dong, Zhang Ling, Zhang Jiaheng
Sauvage Laboratory for Smart Materials, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.
Shenzhen key Laboratory of Flexible Printed Electronics Technology, School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.
Chem Asian J. 2024 Nov 4;19(21):e202400290. doi: 10.1002/asia.202400290. Epub 2024 Oct 3.
Manganous-manganic oxide (MnO), akin to other manganese-based oxides, faces several critical challenges such as substantial capacity fading and limited rate performance due to its inferior electrical conductivity, in addition to the inevitable dissociation of Mn. To address these issues, we introduce for the first time a novel carbon-coated MnO/NaCO (MnO/NaCO/C) composite material. Comprehensive characterizations indicate that NaCO effectively curtails Mndissolution, enhances carbon encapsulation throughout charging/discharging cycles, and exposes additional active sites on the MnO/NaCO/C composite. Electrochemical assessments confirm that the MnO/NaCO/C-2 cathode exhibits exceptional electrochemical performance, outperforming other cathodes in the ZnSO system. Moreover, the MnO/NaCO/C-2 cathode delivers a high specific capacity of ~550 mAh g at 0.1 A g and maintains a significant capacity of ~230 mAh g after 360 cycles at 1.0 A g within the 2.0 M ZnSO+0.2 M MnSO electrolyte system, demonstrating its potential as a high-performance cathode material for aqueous zinc-ion batteries.
与其他锰基氧化物类似，氧化锰（MnO）面临着几个关键挑战，由于其导电性较差，除了不可避免的锰解离外，还存在容量大幅衰减和倍率性能有限等问题。为了解决这些问题，我们首次引入了一种新型的碳包覆MnO/NaCO（MnO/NaCO/C）复合材料。综合表征表明，NaCO有效地抑制了锰的溶解，在整个充放电循环中增强了碳包覆，并在MnO/NaCO/C复合材料上暴露出额外的活性位点。电化学评估证实，MnO/NaCO/C-2阴极表现出优异的电化学性能，在ZnSO体系中优于其他阴极。此外，MnO/NaCO/C-2阴极在0.1 A g下具有约550 mAh g的高比容量，在2.0 M ZnSO+0.2 M MnSO电解质体系中，在1.0 A g下循环360次后仍保持约230 mAh g的显著容量，证明了其作为水系锌离子电池高性能阴极材料的潜力。
