The invention discloses an
electric field induced
crystallization K2.23MgBe0.15P0.07Ti0.03Si4.75O12
potassium fast ion conductor and a preparation method thereof. The
electric field induced
crystallization K2.23MgBe0.15P0.07Ti0.03Si4.75O12
potassium fast ion conductor is characterized in that Be<2+> is adopted to partially replace Si<4+> ions, high-concentration interstitial
potassium ions are generated in crystals, thus the close-range multiple
potassium ions are collaboratively migrated, and migration
activation energy of the
potassium ions is reduced advantageously; the
electronic conductivity of the
fast ion conductor is further lowered through P<5+>
doping; the size of a migration channel of the
potassium ions is adjusted through small-
ion-
radius Be<2+>
doping so as to adapt to rapidmigration of the potassium ions; through Ti<4+> partial
doping, distorted lattice structures are formed to increase
lattice defects, and thus potassium
ion conduction is facilitated; and in the preparation process, the surfaces of K2MgSi5O12 particles are modified, and the easy-to-sinter characteristic is formed. Meanwhile, strong direct-
current electric field induced
crystallization is introducedto increase the crystallization speed, the
crystallization temperature is decreased, and crystallization completeness is improved. Through the collaborative effect, the normal-temperature potassium
ion conductivity of the potassium fast ion conductor exceeds 5*10<-4> S / cm and is closer to the potassium ion
conductivity of a liquid
electrolyte.