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

The invention relates to an Mg2+, Al3+, Zr4+ and F- ion co-doped garnet-type solid electrolyte Li5La3Nb2O12 which is characterized in that the stoichiometric equation is: Li5+x+2y+z-mLa3-xMgxAlyZrzNb2-y-zO12-mFm, wherein x=0.1-0.5, y=0.1-0.2, z=0.1-0.2, and m=0.1-0.3. Li2CO3, La2O3, MgO, Al2O3, ZrO2, Nb2O5 and Li2F are evenly mixed in proportion (mole ratio) of (2.25-2.9):(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 after ball milling, pressing and sintering, the solid electrolyte is obtained. Room-temperature lithium-ion conductivity of the obtained solid electrolyte is larger than 10-4S / cm.

The invention relates to a polyanion composite material, which has a general formula of BxCyNz-LiaD' bMcD'' dXOeAf, with BxCyNz as a compound of boron and carbon, or carbon and nitrogen, or boron, carbon and nitrogen. The invention provides a preparation method of the composite material and its application. The invention also provides a positive electrode with the composite material of the invention and a lithium battery containing the positive electrode. The composite material provided in the invention has high electronic conductivity and ionic conductivity, especially has an excellent rate performance and good cycle stability.

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 relates to a polyolefin-g-polybenzimidazole graft copolymer and its preparation method and application. The graft copolymer is the grafting of polyolefin grafted benzimidazole polymer obtained by condensation reaction of the terminal amino group in the benzimidazole polymer and the carboxyl group in the side chain carboxyl-containing olefin polymer. branch copolymers. The proton transport channel is constructed by the phase separation structure of the two chain segments, thereby improving the proton conductivity and achieving a high temperature proton exchange membrane with high proton conductivity under the condition of a low phosphoric acid doping level (ADL<10). The preparation method is simple and easy to operate, and can be applied to fuel cells, liquid flow batteries and the like.

A liquid-phase synthetic K 6.25 be 0.1 al 0.1 P 0.05 Ti 0.05 Si 1.7 o 7 Potassium fast ion conductor and preparation method thereof, is characterized in that: adopt Al 3+ 、Be 2+ Partial replacement of Si 4+ Ions, generate interstitial potassium ions in the crystal and reduce the activation energy of potassium ion migration; through P 5+ Doping further reduces the electronic conductivity of fast ion conductors; through the small ionic radius Be 2+ Doping adjusts the size of the migration channel of potassium ions to adapt to the rapid migration of potassium ions; through Ti 4+ Partial doping forms a distorted lattice structure to increase lattice defects, which is conducive to the conduction of potassium ions; and during the preparation process at K 6 Si 2 o 7 The surface of the particles is modified to form easy sintering properties. These synergistic effects make the normal temperature potassium ion conductivity of this potassium fast ion conductor exceed 5·10 ‑4 S / cm, which is closer to the potassium ion conductivity of the liquid electrolyte.

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 phosphonated (polyolefin-g-polybenzimidazole) graft copolymer and its preparation method and application. The graft copolymer of the present invention uses soft polyolefins as the main chain, takes rigid PBI as the branch chain, and further prepares through amino-containing phosphonic acid grafting to obtain both phosphonic acid and soft-hard chains. segmented phosphonated graft copolymers. The polymers with two properties will undergo microscopic phase separation to construct proton transport channels, thereby improving proton conductivity; in addition, the flexible main chain drives the movement of PBI branch chains to reduce the activation energy of proton migration, and promote the migration of phosphoric acid or protons to improve proton conductivity. Rate. The grafted amino-containing phosphonic acid can reduce the doping amount of inorganic phosphoric acid, thereby reducing the loss of phosphoric acid during use, so as to improve the proton conductivity retention rate of the membrane.

A liquid-phase synthetic K 2.25 MgB 0.1 Al 0.1 P 0.05 Ti 0.05 Si 4.7 o 12 Potassium fast ion conductor and preparation method thereof, characterized in that: normal temperature potassium ion conductivity exceeds 5.10 ‑4 S / cm. Using Al 3+ 、Be 2+ Partial replacement of Si 4+ Ions, generate interstitial potassium ions in the crystal and reduce the activation energy of potassium ion migration; through P 5+ Doping further reduces the electronic conductivity of fast ion conductors; through the small ionic radius Be 2+ Doping adjusts the size of the migration channel of potassium ions to adapt to the rapid migration of potassium ions; through Ti 4+ Partial doping forms a distorted lattice structure to increase lattice defects, which is conducive to the conduction of potassium ions; and during the preparation process at K 2 MgSi 5 o 12 The surface of the particles is modified to form easy sintering properties. These synergistic effects make the normal temperature potassium ion conductivity of this potassium fast ion conductor exceed 5·10 ‑4 S / cm, which is closer to the potassium ion conductivity of the liquid electrolyte.

a kind of Fe 2 o 3 |FeF 3‑2x o x |Bi 3+ , La 3+ Doped iron fluoride layer structure lithium battery positive electrode material and preparation method, the method adopts solid-phase synthesis of Bi 3+ , La 3+ After doping iron fluoride, according to FeF 3 It is easy to be gradually oxidized to Fe at higher temperature 2 o 3 The characteristics of Bi 3+ , La 3+ Doped iron fluoride particles coated with FeF in turn 3‑2x o x , 0<x<0.3, and Fe 2 o 3 layer to increase the Bi 3+ , La 3+ The surface electronic conductivity of doped iron fluoride and the resistance to the harmful effects of organic electrolytes on the surface of material particles; combined with Bi 3+ , La 3+ Doping greatly improves the comprehensive electrochemical performance of ferric fluoride.