Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba 305-8568, Japan.
Graduate School of System and Information Engineering, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba 305-8573, Japan.
Nat Commun. 2017 Jun 6;8:15607. doi: 10.1038/ncomms15607.
Reducing the high charge potential is a crucial concern in advancing the performance of lithium-oxygen batteries. Here, for water-containing lithium-oxygen batteries with lithium hydroxide products, we find that a hydrogen peroxide aqueous solution added in the electrolyte can effectively promote the decomposition of lithium hydroxide compounds at the ultralow charge potential on a catalyst-free Ketjen Black-based cathode. Furthermore, for non-aqueous lithium-oxygen batteries with lithium peroxide products, we introduce a urea hydrogen peroxide, chelating hydrogen peroxide without any water in the organic, as an electrolyte additive in lithium-oxygen batteries with a lithium metal anode and succeed in the realization of the low charge potential of ∼3.26 V, which is among the best levels reported. In addition, the undesired water generally accompanying hydrogen peroxide solutions is circumvented to protect the lithium metal anode and ensure good battery cycling stability. Our results should provide illuminating insights into approaches to enhancing lithium-oxygen batteries.
降低高充电电位是提高锂氧电池性能的关键关注点。在这里，对于含有氢氧化锂产物的含水锂氧电池，我们发现电解液中添加过氧化氢水溶液可以在无催化剂的基于科琴黑的阴极上有效促进超低压下氢氧化锂化合物的分解。此外，对于含有过氧化锂产物的非水锂氧电池，我们引入一种尿素过氧化氢，一种在有机相中不含任何水的配位过氧化氢，作为带有锂金属阳极的锂氧电池的电解液添加剂，并成功实现了低充电电位约 3.26V，这是已报道的最佳水平之一。此外，还避免了通常伴随过氧化氢溶液的水，以保护锂金属阳极并确保良好的电池循环稳定性。我们的研究结果应该为提高锂氧电池的性能提供了有启发性的思路。
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