https://scholars.lib.ntu.edu.tw/handle/123456789/575844
標題: | Improvement of lithium anode deterioration for ameliorating cyclabilities of non-aqueous Li-CO2 batteries | 作者: | CHIH-JUNG CHEN Yang J.-J Chen C.-H Wei D.-H Hu S.-F Liu R.-S. RU-SHI LIU |
關鍵字: | Anodes; Carbon dioxide; Catalysts; Cathodes; Disintegration; Electrolytes; Lithium batteries; Lithium compounds; Passivation; Ruthenium compounds; Battery degradation; Catalytic surfaces; Dendrite formation; Electrochemical stabilities; Limited capacity; Passivation materials; Replacement methods; Sputtering systems; Lithium | 公開日期: | 2020 | 卷: | 12 | 期: | 15 | 起(迄)頁: | 8385-8396 | 來源出版物: | Nanoscale | 摘要: | Herein, ruthenium (Ru) nanoparticles were anchored on carbon nanotubes (Ru/CNTs) functionalized as catalyst cathodes for non-aqueous Li-CO2 cells. For cycling tests through a low cut-off capacity (100 mA h g-1), the origin of battery deterioration resulted from the accumulation of Li2CO3 discharging products on catalytic surfaces, identical to the observations in previous studies. However, the Li-CO2 cells in this work showed a sudden death within several cycles of high cut-off capacity (500 mA h g-1), and no Li2CO3 residues were investigated on the cathode. In contrast, Li dendrites and passivation materials (LiOH and Li2CO3) were generated on Li anodes upon cycling at a limited capacity of 500 mA h g-1, which dominantly contributed to the battery degradation. A Li foil-replacement method was adopted to make the Ru/CNT cathode perform continuous 100 cycles under a cut-off capacity of 500 mA h g-1. These results indicate that not only Li2CO3 residues blocked on the active sites of the cathode but also Li dendrites and passivation materials produced on the anode caused Li-CO2 battery deterioration. Moreover, in the present work, a carbon thin film was deposited on Li metal (C/Li) by a sputtering system for suppressing the dendrite formation upon cycling and promoting the defense of the H2O attack from the electrolyte disintegration. The Li-CO2 cell with a Ru/CNT catalyst and a C/Li anode revealed an improved electrochemical stability of 115 cycles at a limited capacity of 500 mA h g-1. This proto strategy provided a significant research direction focusing on Li anodes for elevating the Li-CO2 battery durability. ? 2020 The Royal Society of Chemistry. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85083622092&doi=10.1039%2fd0nr00971g&partnerID=40&md5=51f163fa4881eff97063b012cd2708a3 https://scholars.lib.ntu.edu.tw/handle/123456789/575844 |
ISSN: | 20403364 | DOI: | 10.1039/d0nr00971g |
顯示於: | 化學系 |
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