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[Display omitted] The effect of various types of electrolytes on the operation of coordination polymers based on NiII or CuII in lithium-ion batteries has been examined. Cyclic voltammetry, galvanostatic cycling and quantum chemical modeling have been used to study the processes of lithiation and delithiation. It was shown that the use of a new electrolyte based on a mixture of 1 M LiN(CF 3 SO 2) 2 in 1,3-dioxolane–1,2-dimethoxyethane and 1 M LiPF 6 in ethylene carbonate–dimethyl carbonate improved battery performance, while cycling in the range of 0.2–2.5 V increased the discharge capacity up to 177–188 mA h g−1 and stabilized the charge–discharge processes. [ABSTRACT FROM AUTHOR]

We report the synthesis of Ni(II) and Cu(II) coordination polymers with rubeanic acid ligands and their application as electrode materials in lithium and potassium batteries. Both designed polymers delivered specific discharge capacity of ∼100–106 mAh g−1 and demonstrate stable charge-discharge cycling at 1 A g−1 for at least 300 cycles. Furthermore, Ni-based coordination polymer showed decent performance in potassium batteries providing the specific discharge capacity of 138 mAh g−1 after 400 cycles at 0.5 A g−1. The electrode degradation pathways during the battery cycling were investigated using ex-situ FTIR and XPS spectroscopy. • Ni(II) andCu(II) coordination polymers were obtained via a simple one-step reaction. • Ni-based polymershowed encouraging electrochemical performance in Li and K batteries. • Dischargecapacities of 138 mAhg-1 (K) and 207 mAhg-1 (Li) aredelivered by batteries. • Both types ofbatteries demonstrate stable operation for >400 charge-discharge cycles. • Ex-situ FTIR spectroscopy was used to study the electrode degradation pathways. [ABSTRACT FROM AUTHOR]