Xu Ji-Jing, Chang Zhi-Wen, Yin Yan-Bin, Zhang Xin-Bo
State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
ACS Cent Sci. 2017 Jun 28;3(6):598-604. doi: 10.1021/acscentsci.7b00120. Epub 2017 May 24.
The successful development of Li-O battery technology depends on resolving the issue of cathode corrosion by the discharge product (LiO) and/or by the intermediates (LiO) generated during cell cycling. As an important step toward this goal, we report for the first time the nanoporous Ni with a nanoengineered AuNi alloy surface directly attached to Ni foam as a new all-metal cathode system. Compared with other noncarbonaceous cathodes, the Li-O cell with an all-metal cathode is capable of operation with ultrahigh specific capacity (22,551 mAh g at a current density of 1.0 A g) and long-term life (286 cycles). Furthermore, compared with the popularly used carbon cathode, the new all-metal cathode is advantageous because it does not show measurable reactivity toward LiO and/or LiO. As a result, extensive cyclability (40 cycles) with 87.7% LiO formation and decomposition was obtained. These superior properties are explained by the enhanced solvation-mediated formation of the discharge products as well as the tailored properties of the all-metal cathode, including intrinsic chemical stability, high specific surface area, highly porous structure, high conductivity, and superior mechanical stability.
锂氧电池技术的成功发展取决于解决放电产物（LiO）和/或电池循环过程中产生的中间体（LiO）对阴极的腐蚀问题。作为朝着这一目标迈出的重要一步，我们首次报道了一种新型全金属阴极系统，即具有纳米工程化金镍合金表面的纳米多孔镍直接附着在泡沫镍上。与其他非碳质阴极相比，具有全金属阴极的锂氧电池能够在超高比容量（电流密度为1.0 A g时为22551 mAh g）和长寿命（286次循环）下运行。此外，与常用的碳阴极相比，这种新型全金属阴极具有优势，因为它对LiO和/或LiO没有可测量的反应性。结果，获得了具有87.7% LiO形成和分解的广泛循环稳定性（40次循环）。这些优异性能可通过增强溶剂化介导的放电产物形成以及全金属阴极的定制特性来解释，包括固有化学稳定性、高比表面积、高度多孔结构、高导电性和优异的机械稳定性。
