30results about How to "Lower activation energy for migration" patented technology

The invention relates to a spinel composite material, a preparation method and application thereof. The composite material provided by the invention has a general formula of CxNy-(LaM'b)4(McM''d)5O12-eAf, wherein the CxNy is a compound containing carbon and nitrogen. The invention also provides a preparation method and application of the composite material. The invention also provides a cathode comprising the composite material of the invention, and a lithium battery and an electrochemical supercapacitor comprising the cathode. The composition material of the invention has high electronic conductivity and ionic conductivity, particularly high multiplying performance and high cyclical stability.

The invention discloses an Mg<2+>, Al<3+>, Zr<4+> and S<2-> ion co-doped garnet type solid electrolyte Li5La3Nb2O12 which is characterized by comprising the stoichiometric equation: Li[5+x+2y+z]La[3-x]MgxAlyZrzNb[2-y-z]O[12-m]Sm, wherein x is equal to 0.1-0.5, y is equal to 0.1-0.2, z is equal to 0.1-0.2, and m is equal to 0.1-0.3; and the solid electrolyte is formed by uniformly mixing Li2CO3, La2O3, MgO, Al2O3, ZrO2, Nb2O5 and thiourea in the molar ratio of (2.7-3.05):(1.25-1.45):(0.1-0.5):(0.05-0.1):(0.1-0.2):(0.8-0.9):(0.1-0.3), and ball milling, pressing and sintering. According to the invention, the lithium-ion conductivity greater than 10<-4>S/cm can be obtained at room temperature.

The invention relates to a phosphorylated(polyolefin-g-polybenzimidazole) graft copolymer as well as a preparation method and application thereof. According to the graft copolymer, soft polyolefin isused as a main chain, rigid PBI is used as a branched chain, and the phosphorylated graft copolymer which contains phosphonic acid and has a soft-hard chain segment is further prepared through amino-containing phosphonic acid grafting. The polymers with two properties are subjected to microcosmic phase separation to construct a proton transmission channel, so that the proton conductivity is improved. In addition, the flexible main chain drives the PBI branched chain to move so as to reduce proton migration activation energy, promote migration of phosphoric acid or protons and improve proton conductivity. The grafted amino-containing phosphonic acid can reduce the doping amount of inorganic phosphoric acid, so that the loss of phosphoric acid in the use process is reduced, and the proton conductivity retention rate of the membrane is improved.

The invention discloses a high-conductivity double-perovskite-type anode material and a preparation method thereof and belongs to the field of solid oxide fuel cells. The high-conductivity double-perovskite-type anode material is characterized in that a B site of a double-perovskite-type (A2BB'O6) solid oxide fuel cell anode material Sr2MgMoO6 is doped with Y so that the high-conductivity double-perovskite-type anode material which is a mixed conductor having a double-perovskite structure is obtained. The preparation method provided by the invention comprises the following steps of pressing B site-doped Sr2Mg1-xYxMoO6 powder (x is in a range of 0.1 to 0.2) into a sample strip under certain pressure, carrying out sintering at a high temperature in an air atmosphere, carrying out reduction under reduction conditions, and carrying out conductivity measuring, wherein compared with a conductivity measured before doping, a conductivity measured after doping is improved 5.8 times (x=0.2). Through the preparation method provided by the invention, the high-conductivity double-perovskite-type anode material which is a porous film-type anode material Sr2Mg1-xYxMoO6 (x is in a range of 0.1 to 0.2) is obtained, and has good combinability and good chemical compatibility with electrolytes of GDC and LSGM, and carbon distribution-resistant and sulfur poisoning-resistant capabilities higher than carbon distribution-resistant and sulfur poisoning-resistant capabilites of the traditional anode material.

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.

The invention discloses a liquid-phase synthetic K6.4Fe0.05Be0.2Al0.15Ti0.05Si1.6O7 potassium fast ion conductor and a preparation method thereof. The liquid-phase synthetic K6.4Fe0.05Be0.2Al0.15Ti0.05Si1.6O7 potassium fast ion conductor is characterized in that Al<3+> and Be<2+> are adopted to partially replace Si<4+> ions, and interstitial potassium ions are produced in a crystal to reduce migration activation energy of potassium ions; the size of a migration channel of potassium ions is adjusted by doping Be<2+> with a small ion radius to adapt rapid migration of potassium ions; a distortedlattice structure is formed by partial doping of Ti<4+>, lattice defects are increased, and potassium ion conduction is facilitated; cation vacancy is formed through partial doping of Fe<3+> to increase the potassium ion migration path; modification is performed on the surface of K6Si2O7 particles in the preparation process, and the easy-to-sinter characteristic is formed. The normal-temperaturepotassium 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 under the synergistic effect.

The invention discloses an electric field induced crystallization A1<3+> and Be<2+> doped K2MgSi5O12 potassium fast ion conductor and a preparation method thereof. The electric field induced crystallization A1<3+> and Be<2+> doped K2MgSi5O12 potassium fast ion conductor is characterized in that the stoichiometric equation is K<2+2x+y>MgBe<x>Al<y>Si<5-x-y>O12, wherein x is within 0.05 to 0.15, andy is within 0.05 to 0.15; and the normal-temperature potassium ion conductivity exceeds 5.10<-4> S/cm. A1<3+> and Be<2+> are adopted to partially replace Si<4+> ions, and interstitial potassium ions are generated in crystals to reduce migration activation energy of the potassium ions; the size of a migration channel of the potassium ions is adjusted through small-ion-radius Be<2+> doping so as toadapt to rapid migration of the potassium ions; 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 introduced to 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.

The invention discloses a liquid-phase synthesis K<2.25>MgBe<0.1>Al<0.1>P<0.05>Ti<0.05>Si<4.7>O<12> potassium fast ion conductor and a preparation method thereof. The liquid-phase synthesis K<2.25>MgBe<0.1>Al<0.1>P<0.05>Ti<0.05>Si<4.7>O<12> potassium fast ion conductor is characterized in that electrical conductivity of a potassium ion is greater than 5*10<-4>S/cm at room temperature; Al<3+> and Be<2+> are used for partially replacing Si<4+> ions, and interstitial potassium ions are generated in a crystal to reduce the activation energy of potassium ion migration; the electronic conductivity of the fast ion conductor is further reduced through P<5+> doping; the size of a migration channel of the potassium ion is adjusted through doping of Be<2+> with a small ion radius so as to adapt to the rapid migration of the potassium ions; a distorted lattice structure is formed through Ti<4+> partial doping to increase the lattice defect to facilitate potassium ion conduction; and during the preparation process, the surfaces of K2MgSi5O12 particles are modified to form an easy-to-sinter characteristic. According to the synergistic effects, the electrical conductivity of the potassium ions atthe room temperature of the potassium fast ion conductor is greater than 5*10<-4>S/cm and closer to the electrical conductivity of the potassium ions of liquid electrolyte.

A K6Si2O7 potassium fast ion conductor co-doped with P5+, Al3+, Be2+ and Zn2+ ions and a preparation method thereof are provided. The K6Si2O7 potassium fast ion conductor is characterized in that thestoichiometric formula is K<6+2*x+y-z-2*m>Be<x>Al<y>P<z>Zn<m>Si<2-x-y-z>O<7>, wherein x is equal to 0.1-0.2, y is equal to 0.1-0.2, z is equal to 0.02-0.05, and m is equal to 0.02-0.05; and the conductivity of potassium ions at room temperature is higher than 5*10<-4>S/cm. Al3+ and Be2+ partially replace Si4+ ions to produce interstitial potassium ions in a crystal, so as to reduce the activationenergy of potassium ion migration. The electronic conductivity of the fast ionic conductor is further reduced through doping of P5+. The size of the potassium ion migration channels is adjusted through doping of Be2+ with small ion radius in order to adapt to the rapid migration of potassium ions. Zn2+ partially replaces potassium ions to cause cation vacancies, so as to increase the number of potassium ion migration channels. The surface of K6Si2O7 particles is modified in the preparation process to make the conductor easy to sinter. The synergistic effect makes the conductivity of potassiumions of the potassium fast ionic conductor exceed 5*10<-4>S/cm at room temperature, which is closer to the conductivity of potassium ions of liquid electrolyte.