Miao Yidong, Xue Xiaolan, Wang Yanyan, Shi Meiyu, Tang Hailin, Huang Tianlong, Liu Shuhang, Zhang Man, Meng Qingkun, Qi Jiqiu, Wei Fuxiang, Huang Saifang, Cao Peng, Hu Zhenghai, Meng Dongmei, Sui Yanwei
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, P. R. China.
Jiangsu Province High-Efficiency Energy Storage Technology and Equipment Engineering Laboratory, School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, P. R. China.
ACS Appl Mater Interfaces. 2023 Nov 29. doi: 10.1021/acsami.3c13117.
Rechargeable magnesium batteries (RMBs) show great potential in large-scale energy storage systems, due to Mg with high polarity leading to strong interactions within the cathode lattice, and the limited discovery of functional cathode materials with rapid kinetics of Mg diffusion and desirable cyclability retards their development. Herein, we innovatively report the confined synthesis of VS/polyaniline (VS/PANI) hybrid nanosheets. The VS/PANI hybrids with expanded interlayer spacing are successfully prepared through the exfoliation of VS and in situ polymerization between VS nanosheets and aniline. The intercalated PANI increases the interlayer spacing of VS from 0.57 to 0.95 nm and improves its electronic conductivity, leading to rapid Mg-ion diffusivity of 10-10 cm s. Besides, the PANI sandwiched between layers of VS is conducive to maintaining the structural integrity of electrode materials. Benefiting from the above advantages, the VS/PANI-1 hybrids present remarkable performance for Mg storage, showing high reversible discharge capacity (245 mA h g at 100 mA g) and impressive long lifespan (91 mA h g after 2000 cycles at 500 mA g). This work provides new perspectives for designing high-performance cathode materials based on layered materials for RMBs.
可充电镁电池（RMBs）在大规模储能系统中显示出巨大潜力，这是因为镁具有高极性，会导致阴极晶格内产生强相互作用，而且具有快速镁扩散动力学和理想循环性能的功能性阴极材料的发现有限，这阻碍了它们的发展。在此，我们创新性地报道了VS/聚苯胺（VS/PANI）混合纳米片的限域合成。通过VS的剥离以及VS纳米片与苯胺之间的原位聚合，成功制备出层间距扩大的VS/PANI杂化物。插入的聚苯胺将VS的层间距从0.57纳米增加到0.95纳米，并提高了其电子导电性，使得镁离子扩散率达到10⁻¹⁰厘米²/秒。此外，夹在VS层之间的聚苯胺有利于保持电极材料的结构完整性。受益于上述优点，VS/PANI-1杂化物在镁存储方面表现出卓越性能，在100毫安/克时具有高可逆放电容量（245毫安·时/克），在500毫安/克下循环2000次后仍具有令人印象深刻的长寿命（91毫安·时/克）。这项工作为设计基于层状材料的高性能可充电镁电池阴极材料提供了新的视角。
