Preparation formula and process of Na-beta ''-Al2O3 ceramic solid electrolyte

The invention provides a preparation formula of a Na-beta ''-Al2O3 ceramic solid electrolyte. The Na-beta''-Al2O3 ceramic solid electrolyte comprises an aluminum source, a sodium source and a lithium source, wherein the aluminum source is a raw material of which the main phase is gamma-Al2O3 after calcination; the sodium source is a raw material of which the main phase is Na2O after calcination; the lithium source is a raw material of which the main phase is Li2O after calcination; the aluminum source, the sodium source and the lithium source are prepared from the following components in percentage by weight: 37.5%-90% of gamma-Al2O3, 8%-10.5% of Na2O and 0.5%-2% of Li2O, and the gamma-Al2O3 and the Na2O are weighed after being calculated according to the mass ratio of (8.5-9.5): 1. The invention also provides a preparation process of the formula, which comprises the following steps: 1) weighing a lithium source according to the mass percent of Li2O of 0.5-2%, and preparing a lithium salt solution; 2) weighin