Activated Li2S as a High-Performance Cathode for Rechargeable Lithium-Sulfur Batteries.
Activated Li2S as a High-Performance Cathode for Rechargeable Lithium-Sulfur Batteries.
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DOI：
10.1021/jz5021108
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Chenxi Zu;Michael J. Klein;A. Manthiram
中科院分区：
文献类型：
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作者：
Chenxi Zu;Michael J. Klein;A. Manthiram
锂硫（Li-S）电池具有高达2500 Wh kg（-1）的高理论能量密度，被认为是用于下一代能量存储的一种有前景的可再充电电池化学。然而，锂金属阳极退化仍然是一个持续存在的问题，导致Li-S电池的安全问题，阻碍了它们的实际应用。规避上述问题的一种可能的策略是使用替代的、高容量、无锂阳极（例如，Si、Sn、碳）和Li 2S阴极。然而，在绝缘体Li 2S颗粒的初始电荷上确定了大的势垒，限制了电池性能。在这项工作中，散装Li 2S颗粒有效地激活与电解质含有P2 S5，导致在降低的初始充电电压平台。这允许直接使用市售的块状Li 2S颗粒作为室温可再充电Li-S电池的高容量阴极，显著降低了Li-S电池的制造成本。
Lithium-sulfur (Li-S) batteries with a high theoretical energy density of ∼2500 Wh kg(-1) are considered as one promising rechargeable battery chemistry for next-generation energy storage. However, lithium-metal anode degradation remains a persistent problem causing safety concerns for Li-S batteries, hindering their practical utility. One possible strategy to circumvent the aforementioned problems is to use alternative, high-capacity, lithium-free anodes (e.g., Si, Sn, carbon) and a Li2S cathode. However, a large potential barrier was identified on the initial charge of insulating bulk Li2S particles, limiting the cell performance. In this work, the bulk Li2S particles were effectively activated with an electrolyte containing P2S5, resulting in a lowered initial charging voltage plateau. This permits the direct use of commercially available bulk Li2S particles as a high-capacity cathode for room-temperature, rechargeable Li-S batteries, significantly lowering the manufacturing cost of Li-S cells.