Shu Chaozhu, Li Bo, Zhang Bingsen, Su Dangsheng
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning, 110016, China.
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan, 610059, China.
ChemSusChem. 2015 Dec 7;8(23):3973-6. doi: 10.1002/cssc.201501169. Epub 2015 Nov 12.
The lithium-oxygen (Li-O2 ) battery is a very appealing candidate for advanced high energy applications owing to its exceptionally high specific energy. However, its poor energy efficiency, rate capability, and cyclability remain key barriers to its practical application. In this work, using a rationally designed cathode based on a bimodal mesoporous nitrogen-doped graphene/carbon nanotube (NGC) composite, we have developed a Li-O2 battery demonstrating enhanced round-trip efficiency (ca. 85 %) and excellent cyclability over 400 cycles under a high current rate of 500 mA g(-1) . The excellent cyclability and rate capability are attributed to improved stability of the aggressive LiO2 intermediate on the nitrogen-doped carbon surface in addition to the favorable hierarchical architecture of NGC. These results demonstrate a valuable research direction to achieve highly stable and reversible Li-O2 batteries through tuning the surface chemistry of the cathode in addition to finding a stable electrolyte solvent.
锂氧（Li-O₂）电池因其极高的比能量，是先进高能量应用中极具吸引力的候选者。然而，其低能量效率、倍率性能和循环稳定性仍是实际应用的关键障碍。在这项工作中，我们通过使用基于双峰介孔氮掺杂石墨烯/碳纳米管（NGC）复合材料合理设计的阴极，开发了一种锂氧电池，该电池在500 mA g⁻¹的高电流速率下展现出增强的往返效率（约85%）以及超过400次循环的优异循环稳定性。优异的循环稳定性和倍率性能归因于除了NGC有利的分级结构外，氮掺杂碳表面上活性LiO₂中间体稳定性的提高。这些结果表明了一个有价值的研究方向，即除了寻找稳定的电解质溶剂外，还可通过调节阴极的表面化学来实现高度稳定和可逆的锂氧电池。
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