摘要
Multivalent metal-ion batteries have attracted wide attention with the expectation of tackling the needs of large-scale electrochemical energy storage[1].Among them,rechargeable calcium(Ca)-ion batteries are known as a promising alternative to conventional lithium(Li)-ion batteries due to the high abundance of calcium(the fifth most abundant element in the earth’s crust)and its large theoretical capacity(2,073 m Ah cm^(-3))and potential(-2.87 V vs.standard hydrogen electrode,SHE)comparable to that of Li(-3.04 V vs.SHE).Furthermore,unlike monovalent cations,the divalent calcium cations favor a two-electron transfer to increase the specific energies[2].
