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High‐Performance Lithium‐Oxygen Battery Electrolyte Derived from Optimum Combination of Solvent and Lithium Salt
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-25 , DOI: 10.1002/advs.201700235 Su Mi Ahn 1 , Jungdon Suk 1 , Do Youb Kim 1 , Yongku Kang 1 , Hwan Kyu Kim 2 , Dong Wook Kim 1
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-25 , DOI: 10.1002/advs.201700235 Su Mi Ahn 1 , Jungdon Suk 1 , Do Youb Kim 1 , Yongku Kang 1 , Hwan Kyu Kim 2 , Dong Wook Kim 1
Affiliation
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To fabricate a sustainable lithium‐oxygen (Li‐O2) battery, it is crucial to identify an optimum electrolyte. Herein, it is found that tetramethylene sulfone (TMS) and lithium nitrate (LiNO3) form the optimum electrolyte, which greatly reduces the overpotential at charge, exhibits superior oxygen efficiency, and allows stable cycling for 100 cycles. Linear sweep voltammetry (LSV) and differential electrochemical mass spectrometry (DEMS) analyses reveal that neat TMS is stable to oxidative decomposition and exhibit good compatibility with a lithium metal. But, when TMS is combined with typical lithium salts, its performance is far from satisfactory. However, the TMS electrolyte containing LiNO3 exhibits a very low overpotential, which minimizes the side reactions and shows high oxygen efficiency. LSV‐DEMS study confirms that the TMS‐LiNO3 electrolyte efficiently produces NO2−, which initiates a redox shuttle reaction. Interestingly, this NO2−/NO2 redox reaction derived from the LiNO3 salt is not very effective in solvents other than TMS. Compared with other common Li‐O2 solvents, TMS seems optimum solvent for the efficient use of LiNO3 salt. Good compatibility with lithium metal, high dielectric constant, and low donicity of TMS are considered to be highly favorable to an efficient NO2−/NO2 redox reaction, which results in a high‐performance Li‐O2 battery.
中文翻译：
溶剂和锂盐最佳组合衍生的高性能锂氧电池电解质
要制造可持续的锂氧（Li-O 2）电池，确定最佳电解质至关重要。在此，发现四亚甲基砜（TMS）和硝酸锂（LiNO 3）形成最佳的电解质，其极大地降低了充电时的过电势，表现出优异的氧气效率，并且允许稳定循环100个循环。线性扫描伏安法（LSV）和差示电化学质谱法（DEMS）分析表明，纯净TMS对氧化分解稳定，并且与锂金属具有良好的相容性。但是，当TMS与典型的锂盐结合使用时，其性能远不能令人满意。但是，含有LiNO 3的TMS电解质表现出非常低的过电势，可最大程度减少副反应并显示出高氧气效率。LSV-DEMS研究证实，TMS-的LiNO 3电解质有效地产生NO 2 - ，其中发起氧化还原梭反应。有趣的是，该NO 2 - / NO 2的氧化还原反应而衍生的LiNO 3盐不大于TMS其它溶剂是非常有效的。与其他常见的Li-O 2溶剂相比，TMS似乎是有效使用LiNO 3盐的最佳溶剂。与锂金属的良好相容性，高介电常数和TMS的低电导率被认为对高效NO 2-高度有利。/ NO 2氧化还原反应，可产生高性能的Li-O 2电池。
更新日期：2017-07-25
中文翻译：
溶剂和锂盐最佳组合衍生的高性能锂氧电池电解质
要制造可持续的锂氧（Li-O 2）电池，确定最佳电解质至关重要。在此，发现四亚甲基砜（TMS）和硝酸锂（LiNO 3）形成最佳的电解质，其极大地降低了充电时的过电势，表现出优异的氧气效率，并且允许稳定循环100个循环。线性扫描伏安法（LSV）和差示电化学质谱法（DEMS）分析表明，纯净TMS对氧化分解稳定，并且与锂金属具有良好的相容性。但是，当TMS与典型的锂盐结合使用时，其性能远不能令人满意。但是，含有LiNO 3的TMS电解质表现出非常低的过电势，可最大程度减少副反应并显示出高氧气效率。LSV-DEMS研究证实，TMS-的LiNO 3电解质有效地产生NO 2 - ，其中发起氧化还原梭反应。有趣的是，该NO 2 - / NO 2的氧化还原反应而衍生的LiNO 3盐不大于TMS其它溶剂是非常有效的。与其他常见的Li-O 2溶剂相比，TMS似乎是有效使用LiNO 3盐的最佳溶剂。与锂金属的良好相容性，高介电常数和TMS的低电导率被认为对高效NO 2-高度有利。/ NO 2氧化还原反应，可产生高性能的Li-O 2电池。
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