Discovery of a “Bipolar Charging” Mechanism
in the Solid-State Electrochemical Process of a Flexible Metal–Organic
Framework
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Abstract
Metal–organic
frameworks (MOFs) are well-known for their application to various
types of energy storage; nevertheless, their potential in electron
storage has scarcely been investigated. Indeed, the synthetic strategy
of MOFs toward the pseudocapactive materials is still absent due to
the lack of a detailed insight into the solid-state redox process
of MOFs. In this manuscript, we reported the discovery of a new electrochemical
mechanism, namely, “bipolar charging” mechanism by analyzing
the solid-state electrochemical process of a flexible redox active
MOF. In a single redox cycle, not only the Li-ions but also the bulky
anions are separately intercalated into the pores of the MOF and contribute
to the total capacity. With this “bipolar charging”
mechanism, a general synthetic strategy could be proposed. Furthermore,
MOF materials employing this mechanism may exhibit remarkable reactivity
and high cyclic stability and be adopted as versatile electrode materials
in various battery architectures