Improvement of lithium anode deterioration for ameliorating cyclabilities of non-aqueous Li-CO2 batteries

Chih Jung Chen, Jun Jie Yang, Chien Hung Chen, Da Hua Wei, Shu Fen Hu, Ru Shi Liu

研究成果: 雜誌貢獻期刊論文同行評審

8 引文 斯高帕斯(Scopus)

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.

原文英語
頁(從 - 到)8385-8396
頁數12
期刊Nanoscale
12
發行號15
DOIs
出版狀態已發佈 - 2020 四月 21

ASJC Scopus subject areas

  • 材料科學(全部)

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