Zhao Ning, Li Chilin, Guo Xiangxin
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Phys Chem Chem Phys. 2014 Aug 7;16(29):15646-52. doi: 10.1039/c4cp01961j. Epub 2014 Jun 24.
Metal-air batteries are thought to be the ultimate solution for energy storage systems owing to their high energy density. Here we report a long-life Na-O2 battery with a high capacity of 750 mA h g(carbon)(-1) by manipulating the nucleation and growth of nano-sized NaO2 particles in a vertically aligned carbon nanotubes (VACNTs) network with a large surface area. Benefiting from the kinetically favorable formation of NaO2 reaction with a low overpotential of 0.2 V, the electrical energy efficiency is as high as 90% for up to 100 cycles. A good rate performance (1500 mA h g(carbon)(-1) at 667 mA g(carbon)(-1)) can be achieved through pre-deposition of a thin NaO2 layer. This study encourages the exploration of the key factors influencing the performance of metal-air batteries, as well as Na-based batteries characterized by phase transformation or conversion reactions.
金属空气电池因其高能量密度被认为是储能系统的终极解决方案。在此，我们报告一种长寿命的钠氧电池，通过在具有大表面积的垂直排列碳纳米管（VACNTs）网络中操控纳米级NaO₂颗粒的成核和生长，其容量高达750 mA h g（碳）⁻¹ 。受益于动力学上有利的NaO₂反应形成，过电位低至约0.2 V，电能效率高达90%，可持续100个循环。通过预沉积一层薄的NaO₂层，可以实现良好的倍率性能（在667 mA g（碳）⁻¹ 时约为1500 mA h g（碳）⁻¹ ）。这项研究鼓励探索影响金属空气电池性能的关键因素，以及以相变或转换反应为特征的钠基电池。
