Cation Additive Enabled Rechargeable LiOH-Based Lithium-Oxygen Batteries
Cation Additive Enabled Rechargeable LiOH-Based Lithium-Oxygen Batteries
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DOI：
10.1002/anie.202010745
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发表时间：
2020-11-19
影响因子：
16.6
通讯作者：
Amine, Khalil
中科院分区：
文献类型：
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作者：
Bi, Xuanxuan;Li, Matthew;Amine, Khalil
锂氧（Li-O-2）电池因其高能量密度而引起了广泛的研究兴趣。除了Li2O2 （Li-O-2电池的典型放电产物）之外，LiOH作为一种替代产品已被证明具有电化学活性。在这里，我们报告了一种简单的策略，通过在锂电解质中使用阳离子添加剂钠离子来实现可逆的锂离子基锂氧电池。在电池中没有氧化还原介质的情况下，LiOH作为唯一的放电产物被检测到，它在3.4 V的低充电电位下充电。提出了一种基于溶液的反应途径，表明催化剂和Li+的竞争溶剂化环境导致阴极上LiOH的沉淀。通过设计一个简单的系统来促进LiOH的形成/分解，调整锂氧电池的电池化学是至关重要的。
Lithium-oxygen (Li-O-2) batteries have attracted extensive research interest due to their high energy density. Other than Li2O2 (a typical discharge product in Li-O-2 batteries), LiOH has proved to be electrochemically active as an alternative product. Here we report a simple strategy to achieve a reversible LiOH-based Li-O-2 battery by using a cation additive, sodium ions, to the lithium electrolyte. Without redox mediators in the cell, LiOH is detected as the sole discharge product and it charges at a low charge potential of 3.4 V. A solution-based reaction route is proposed, showing that the competing solvation environment of the catalyst and Li+ leads to LiOH precipitation at the cathode. It is critical to tune the cell chemistry of Li-O-2 batteries by designing a simple system to promote LiOH formation/decomposition.