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https://doi.org/10.1039/c9ta01606f
Title: | Promoting defective-Li2O2 formation via Na doping for Li-O-2 batteries with low charge overpotentials | Authors: | Zhiyang Lyu Wang Tao Rui Guo Yin Zhou Junchao Chen Xiao Wang Ming Lin XinXin Tian Min Lai Luming Peng Li Wang Zhangquan Peng Wei Chen |
Keywords: | Science & Technology Physical Sciences Technology Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Materials Science LITHIUM-OXYGEN BATTERY LI-AIR BATTERIES LI2O2 FORMATION DISCHARGE PRODUCTS POTASSIUM-IONS SODIUM TRANSPORT REDUCTION CATALYST NANOPARTICLES |
Issue Date: | 7-May-2019 | Publisher: | ROYAL SOC CHEMISTRY | Citation: | Zhiyang Lyu, Wang Tao, Rui Guo, Yin Zhou, Junchao Chen, Xiao Wang, Ming Lin, XinXin Tian, Min Lai, Luming Peng, Li Wang, Zhangquan Peng, Wei Chen (2019-05-07). Promoting defective-Li2O2 formation via Na doping for Li-O-2 batteries with low charge overpotentials. JOURNAL OF MATERIALS CHEMISTRY A 7 (17) : 10389-10396. ScholarBank@NUS Repository. https://doi.org/10.1039/c9ta01606f | Abstract: | © The Royal Society of Chemistry. Li-O2 batteries represent a promising candidate for next-generation energy storage systems because of their high specific energy density. However, one key limitation is their low energy efficiency, which is caused by the high charge overpotential owing to the sluggish oxidation kinetics of the insulating Li2O2 product. Here, we report an approach to reduce charge overpotentials by forming Na-doped defective Li2O2 in a Na+-added electrolyte, which is verified by systematic experimental characterization. Theoretical simulations reveal that the Na-doped Li2O2 with lithium vacancies exhibits new conducting states right above the valence band edge, thereby enhancing electron transport properties. The cell with the defective-Li2O2 product achieves a charge overpotential of ∼0.4 V, much lower than that of the cell with Li2O2 (∼1.1 V). This study offers an effective approach to promote Li2O2 decomposition by forming defective Li2O2. | Source Title: | JOURNAL OF MATERIALS CHEMISTRY A | URI: | https://scholarbank.nus.edu.sg/handle/10635/169207 | ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/c9ta01606f |
Appears in Collections: | Staff Publications Elements |
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