Novel Bimetallic Activated Center Alloying Mechanism Positive Electrodes for Aluminum Storage

Abstract

Aluminum is the most abundant metal element in the Earth's crust, thus developing the rechargeable aluminum‐ion batteries (AIBs) provides an ideal opportunity to realize cells with pleasing energy‐to‐price ratios. However, the further development of AIBs is plagued by the scarcity of suitable positive electrode materials. Here, for the first time, a tin‐based alloy positive electrode material for AIBs, Co3Sn2 wrapped with graphene oxide (Co3Sn2@GO composite) is well‐designed and investigated to understand the aluminum storage behavior. A series of experimental measurements and theoretical calculations results reveal that a novel “bimetallic activated center alloying reaction” aluminum storage mechanism is occurred on the prepared Co3Sn2 positive electrode. The reversible alloying/de‐alloying process in AlCl3/[EMIm]Cl ionic liquid, where both Co and Sn in Co3Sn2 alloys react electrochemically with Al3+ to form AlxSn and AlyCo is first put forward. This study delineates new insights on the aluminum storage mechanism, which may guide to ultimately exploit the energy benefits of “bimetallic activated center alloying redox”.

SnS2 quantum dots-coated VO2@carbon nanorods for secondary battery displaying high capacity and rate-performance

“…9 Liu et al proposed and demonstrated the Al-storage mechanism of an alloying reaction with a bimetallic activation center. 10 Li et al tuned the gradients of heteroatoms, N and P, doped in the MOF-derived porous carbon in a C@N–C@N,P–C heterostructure. 11 The N,P doped C@N–C@N,P–C promoted the spontaneous transfer of electrons and AlCl 4 − anions among gradient components.…”

Solvent-free synthesis of a new perfluorinated MIL-53(Al) with a temperature-induced breathing effect

“…6 Aluminum is one of the cheapest and most abundant metals present in nature (8.2 wt% on the earth crust). 7 The interest for this metal as inorganic node in MOFs has seen a rapid growth in the last decade, as a large variety of Al-MOFs [8][9][10][11][12][13] were reported in the literature. These MOFs usually display high stability and find application in atmospheric water harvesting, 14 gas separation, 15 adsorption-driven heat pumps [16][17][18] and molecules sorption in solution.…”

Solvent-Free Synthesis of a new Perfluorinated MIL-53(Al) with a Genuine Temperature-Induced Breathing Effect

“…6 Aluminum is one of the cheapest and most abundant metals present in nature (8.2 wt% on the earth crust). 7 The interest for this metal as inorganic node in MOFs has seen a rapid growth in the last decade, as a large variety of Al-MOFs [8][9][10][11][12][13] were reported in the literature. These MOFs usually display high stability and find application in atmospheric water harvesting, 14 gas separation, 15 adsorption-driven heat pumps [16][17][18] and molecules sorption in solution.…”