Influence Of Cerium (IV) Oxide For Reversible Oxygen Activity In Li2RuO3 And Li3RuO4
M. Nedyalkov, L. Alexandrov, R. Kukeva, P. Tzvetkov, R. Stoyanova
Abstract: Ruthenates are group of inorganic compounds with variety of oxidation states of ruthenium ranging from plus (IV) to (VII). That rich variety of oxidation states combined with layered structure makes them highly perspective for use of battery applications. A very high specific capacity for some of these compounds has been reported [1,2]. This is possible because two different forms of active redox reaction affecting both the transition metal and the oxygen are possible. Our main objective is to activate the oxygen redox activity which can significantly enhance the specific capacity of ruthenate based electrode materials to above 300 mAh/g. Achieving such a high specific capacity poses a challenge because the oxygen activity becomes irreversible shortly after few cycles and hence oxygen gas is released into the battery enclosure and a serious decrease of specific capacity is observed. In the present work we study the influence of the irreversible oxygen activity. We hypothesize that addition of cerium (IV) oxide to ruthenate based electrode materials can influence the irreversible oxygen activity by reversibly binding during battery charging and releasing oxygen during the discharge phase. The modification of ruthenates with CeO2 is motivated due to its exceptional capability to store oxygen reversibly.
References:
[1] H. Li, S. Ramakrishnan, J. W. Freeland, B. D. McCloskey, and J.Cabana JACS, 142 (18), (2020) p. 8160.
[2] Li, B., Shao, R., Yan, H., An, L., Zhang, B., Wei, H., Han, X. Advanced Functional Materials, 26(9), (2016) p. 1330.
Acknowledgement: The authors thank to the financial support of projects “CARIM” (KП-06-ДВ-6/16.12.2019)
The authors from CARiM’s Research Team are bolded.
VIHREN-CARiM 2019 