New and Renewable Energy Research Division and ‡Energy Efficiency and Materials Research Division, Korea Institute of Energy Research , 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
ACS Appl Mater Interfaces. 2014 Oct 22;6(20):17815-22. doi: 10.1021/am504463b. Epub 2014 Oct 3.
Rechargeable lithium-oxygen (Li-O2) batteries have higher theoretical energy densities than today's lithium-ion batteries and are consequently considered to be an attractive energy storage technology to enable long-range electric vehicles. The main constituents comprising a cathode of a lithium-oxygen (Li-O2) battery, such as carbon and binders, suffer from irreversible decomposition, leading to significant performance degradation. Here, carbon- and binder-free cathodes based on nonprecious metal oxides are designed and fabricated for Li-O2 batteries. A novel structure of the oxide-only cathode having a high porosity and a large surface area is proposed that consists of numerous one-dimensional nanoneedle arrays decorated with thin nanoflakes. These oxide-only cathodes with the tailored architecture show high specific capacities and remarkably reduced charge potentials (in comparison with a carbon-only cathode) as well as excellent cyclability (250 cycles).
可充电锂-氧（Li-O2）电池的理论能量密度高于现今的锂离子电池，因此被认为是一种很有吸引力的储能技术，可以实现长距离电动汽车。锂-氧（Li-O2）电池的阴极主要由碳和粘结剂等组成，它们会不可逆转地分解，导致性能显著下降。在这里，设计并制造了基于非贵金属氧化物的无碳和无粘结剂的 Li-O2 电池阴极。提出了一种具有高孔隙率和大表面积的新型氧化物阴极结构，该结构由许多一维纳米针阵列组成，上面覆盖着薄的纳米薄片。这种具有定制结构的氧化物阴极具有高比容量和显著降低的充电电位（与仅含碳的阴极相比）以及出色的循环稳定性（250 次循环）。
