College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, PR China.
Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 305-8568, Japan.
ACS Appl Mater Interfaces. 2016 Apr 6;8(13):8427-35. doi: 10.1021/acsami.5b10856. Epub 2016 Mar 22.
Rechargeable lithium-oxygen (Li-O2) batteries are consequently considered to be an attractive energy storage technology because of the high theoretical energy densities. Here, an effective binder-free cathode with high capacity for Li-O2 batteries, needle-like mesoporous NiCo2O4 nanowire arrays uniformly coated on the flexible carbon textile have been in situ fabricated via a facile hydrothermal process followed by low temperature calcination. Because of the material and structural features, the needle-like NiCo2O4 nanowire arrays (NCONWAs) served as a binder-free cathode exhibits high specific capacity (4221 mAh g(-1)), excellent rate capability, and outstanding cycling stability (200 cycles). This cathode based on nonprecious mesoporous metal oxides nanowire arrays has large open spaces and high surface area, providing numerous catalytically active sites and effective transmission pathways for lithium ion and oxygen, and promises the abundant Li2O2 storage. The fast electron transport by directly anchoring on the substrate ensures fast electrochemical reaction process involved with the every nanowire. Furthermore, a bendable Li-O2 battery assembled by using the flexible NCONWAs as the cathode, can be able to light an LED and shows good rate capability and cyclic stability.
可充电锂-氧（Li-O2）电池由于具有高的理论能量密度，因此被认为是一种有吸引力的储能技术。在这里，通过简便的水热过程随后进行低温煅烧，原位制备了在柔性碳纺织品上均匀涂覆有高容量的用于 Li-O2 电池的无粘结剂的针状介孔 NiCo2O4 纳米线阵列。由于材料和结构的特点，作为无粘结剂的阴极的针状 NiCo2O4 纳米线阵列（NCONWAs）表现出高比容量（4221 mAh g-1）、优异的倍率性能和出色的循环稳定性（200 次循环）。基于非贵金属介孔金属氧化物纳米线阵列的这种阴极具有大的开放空间和高的表面积，为锂离子和氧气提供了大量的催化活性位点和有效的传输途径，并有望实现丰富的 Li2O2 储存。通过直接附着在基底上的快速电子传输确保了涉及每根纳米线的快速电化学反应过程。此外，使用柔性 NCONWAs 作为阴极组装的可弯曲 Li-O2 电池可以点亮一个 LED，并表现出良好的倍率性能和循环稳定性。
