Bi-metallic boride as the electrode material of aqueous battery enabling ultrahigh rate and cycling performances

A facile chemical reduction method for preparation of CoNiB was designed and developed. The obtained products showed outstanding electrochemical performances as positive electrode materials in aqueous electrolytes at different current densities (from 1 A g−1 to 20 A g−1). CoNiB nanocomposite exhibited reversible specific capacity of 319.4 mAh g−1, remarkable rate capability over 90% at 20 A g−1, and excellent cyclability with no obvious decay...