A
Rechargeable Al–Te Battery
Handong Jiao
Donghua Tian
Shijie Li
Chaopeng Fu
Shuqiang Jiao
10.1021/acsaem.8b00905.s001
https://acs.figshare.com/articles/journal_contribution/A_Rechargeable_Al_Te_Battery/6981539
Rechargeable
aluminum based batteries attract particular attention due to their
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 a rechargeable lithium
ion battery. In this work, we present the redox process of a tellurium
electrode in a Lewis acidic AlCl<sub>3</sub>/[EMIm]Cl room temperature
ionic liquid and disclose, for the first time, that the tellurium
not only can be reduced to Te<sup>2–</sup> but also can be
oxidized to TeCl<sub>3</sub><sup>+</sup>, 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 plateau at
∼1.5 V, already approaching that of a Li–Te battery
(1.7 V). Significantly, this work brings 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 an unprecedented 5015.09 mAh/g when it undergoes
a similar reversible redox process from S<sup>2–</sup> to SCl<sub>3</sub><sup>+</sup>.
2018-08-03 00:00:00
aluminum ion batteries
lithium ion battery
capacity
ultrahigh rate performance
mAh
room temperature chloroaluminate
discharge voltage plateau
redox process
tellurium