It is a kind of containing rubidium and/or the sodium-ion battery electrolysis additive of caesium cation and its application

The invention discloses a kind of containing rubidium and/or the sodium-ion battery electrolysis additive of caesium cation and its application.A kind of application the invention provides rubidium and/or caesium cation in sodium-ion battery field as sodium-ion battery electrolysis additive, wherein, described sodium-ion battery electrolyte includes rubidium and/or caesium cation, electrolyte sodium salt and organic solvent；Molar concentration of the described rubidium and/or caesium cation in described sodium-ion battery electrolyte is 0.01 0.2mol/L；Molar concentration of the described electrolyte sodium salt in described sodium-ion battery electrolyte is 0.5 2mol/L.Sodium-ion battery electrolysis additive containing rubidium and/or caesium cation is applied to sodium-ion battery field by the present invention, is further increased the stability of sodium-ion battery negative pole SEI films, the polarization for reducing impedance, reducing sodium-ion battery, is improved the stable circulation performance of sodium-ion battery, extends the sodium-ion battery life-span.