A lithium-oxygen battery with a long cycle life in an air-like atmosphere
A lithium-oxygen battery with a long cycle life in an air-like atmosphere
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DOI：
10.1038/nature25984
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发表时间：
2018-03-22
期刊：
影响因子：
64.8
通讯作者：
Salehi-Khojin, Amin
中科院分区：
文献类型：
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作者：
Asadi, Mohammad;Sayahpour, Baharak;Salehi-Khojin, Amin
锂空气电池被认为是锂离子电池在运输应用中的潜在替代品，因为它们具有较高的理论比能（1）。然而，到目前为止，这种系统主要限于纯氧环境（锂氧电池），并且由于涉及阴极、阳极和电解质的副反应而具有有限的循环寿命（2 - 5）。在氮气、二氧化碳和水蒸气的存在下，这些副反应可能变得更加复杂（6 - 11）。此外，由于需要储存氧气，锂-氧系统的体积能量密度对于实际应用来说可能太小（12）。在这里，我们报道了一种系统，该系统包括碳酸锂基保护阳极、二硫化钼阴极（2）和离子液体/二甲基亚砜电解质，该系统在模拟空气气氛中作为锂-空气电池运行，具有高达700次循环的长循环寿命。我们进行计算研究，以提供洞察系统在这种环境下的操作。这种在类似空气的气氛中具有长循环寿命的锂氧电池的展示是朝着锂离子技术之外的该领域发展的重要一步，有可能获得比传统锂离子电池高得多的比能量密度。
Lithium-air batteries are considered to be a potential alternative to lithium-ion batteries for transportation applications, owing to their high theoretical specific energy(1). So far, however, such systems have been largely restricted to pure oxygen environments (lithium oxygen batteries) and have a limited cycle life owing to side reactions involving the cathode, anode and electrolyte(2-5). In the presence of nitrogen, carbon dioxide and water vapour, these side reactions can become even more complex(6-11). Moreover, because of the need to store oxygen, the volumetric energy densities of lithium-oxygen systems may be too small for practical applications(12). Here we report a system comprising a lithium carbonate-based protected anode, a molybdenum disulfide cathode(2) and an ionic liquid/di methyl sulfoxide electrolyte that operates as a lithium-air battery in a simulated air atmosphere with a long cycle life of up to 700 cycles. We perform computational studies to provide insight into the operation of the system in this environment. This demonstration of a lithium-oxygen battery with a long cycle life in an air-like atmosphere is an important step towards the development of this field beyond lithium-ion technology, with a possibility to obtain much higher specific energy densities than for conventional lithium ion batteries.