Sodium-ion battery non-aqueous electrolyte and sodium-ion battery

The invention relates to the technical field of electrochemistry, in particular to a sodium ion battery non-aqueous electrolyte and a sodium ion battery. The non-aqueous electrolyte comprises an electrolyte salt, an additive and a solvent, the additives comprise a phosphorus-containing compound additive and a gas production inhibiting additive; the molecular formula of the phosphorus-containing compound additive is CxHyO3zPzRm, z is greater than or equal to 1 and less than or equal to 4, x + y is greater than 4 and less than 40, (x + y)/z is greater than 3 and less than 32, m is greater than or equal to 0, and R is any one or more elements selected from Si, F and N; the solvent comprises a cyclic ester solvent and a chain ester solvent; the non-aqueous electrolyte solution satisfies 0.7 < = a/c + b < = 13, 0.2 < = a < = 2, 0.3 < = b < = 3, and 0.1 < = c < = 1. The phosphorus-containing compound additive with the molecular formula of CxHyO3zPzRm and the gas production inhibiting additive are selected, meanwhil