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A rechargeable Al-Te battery Handong Jiao, Donghua Tian, Shijie Li, Chaopeng Fu, and Shuqiang Jiao ACS Appl. Energy Mater., Just Accepted Manuscript • DOI: 10.1021/acsaem.8b00905 • Publication Date (Web): 03 Aug 2018 Downloaded from http://pubs.acs.org on August 7, 2018
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ACS Applied Energy Materials
A Rechargeable Al-Te Battery Handong Jiao,a Donghua Tian,a Shijie Li,a Chaopeng Fu,b Shuqiang Jiao*a a
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing,
Beijing, 100083, P R China. * E-mail:
[email protected] b
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R.
China
ABSTRACTS: Rechargeable aluminum based batteries attract particular attention due to theirs high anode capacity, safety and cost advantage. Recently, high discharge voltage, ultrahigh rate performance and long cycle life of aluminum ion batteries have been reported. However, the capacity of these Al-based batteries is limited, and it is of great value to explore novel cathodes with high reversible capacity that can rival rechargeable lithium ion battery. In this work, we present the redox process of tellurium electrode in a Lewis acidic AlCl3/[EMIm]Cl room temperature ionic liquid, and disclose, for the first time, that the tellurium not only can be reduced to Te2-, but also can be oxidized to TeCl3+, and the whole process is reversible. Subsequently, we successfully construct a rechargeable Al-Te battery with an initial reversible capacity of ~913 mAh/g, which is close to the theoretical capacity of tellurium of ~1260.27 mAh/g and an obvious discharge voltage plateaus at ~1.5 V, already approaching to that of Li-Te battery (1.7 V). Significantly, this work bring a new way to reconsider the reaction mechanism and the theoretical capacities of chalcogen and its compounds as the cathode of the aluminum based batteries in room temperature chloroaluminate melts. For instance, the theoretical capacity of the sulfur is unprecedented 5015.09 mAh/g when it undergoes a similar reversible redox process from S2- to SCl3+. Key words: Aluminum-based battery; Tellurium; Redox process; High voltage plateaus; High capacity 1
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INTRODUCTION Rechargeable aluminum-based batteries, as one of the most promising energy storage system, have drawn increasing attention because of the high anode capacity (2978 mAh/g and 8034 mAh/L), safety and cost advantage.1-7 However, in the past decades, the development of rechargeable aluminum based batteries was sluggish due to low discharge voltage plateaus (
