Provided is a production method that enables the production of a composite body of lithium titanate particles and a carbonaceous material, the composite body having excellent electrical characteristics and so on, and the composite body of lithium titanate particles and a carbonaceous material. A method for producing a composite body of lithium titanate particles and a carbonaceous material includes the steps of: preparing a raw material mixture using a titanium compound, a lithium compound, and an oligomer and/or raw material monomer of an alkali-soluble resin; and subjecting the raw material mixture to heat treatment under a non-oxidizing atmosphere to produce the composite body.

A transparent electroconductive layer 3 includes a first main surface 5 and a second main surface 6 facing each other in a thickness direction. The transparent electroconductive layer 3 is a single layer extending in a plane direction perpendicular to the thickness direction. The transparent electroconductive layer 3 has a plurality of crystal grains 4, a plurality of first grain boundaries 7 partitioning the plurality of crystal grains 4 and having each of one end edge 9 and another end edge 10 in the thickness direction open in each of the first main surface 5 and the second main surface 6, and a second grain boundary 8 branching from a first intermediate portion 11 of one first grain boundary 7A and reaching a second intermediate portion 12 of another first grain boundary 7B.

A transparent electroconductive layer 3 includes a first main surface 5 and a second main surface 6 facing each other in a thickness direction. The transparent electroconductive layer 3 is a single layer extending in a plane direction perpendicular to the thickness direction. The transparent electroconductive layer 3 has a plurality of crystal grains 4, a plurality of first grain boundaries 7 partitioning the plurality of crystal grains 4 and having each of one end edge 9 and another end edge 10 in the thickness direction open in each of the first main surface 5 and the second main surface 6, and a second grain boundary 8 branching from a first intermediate portion 11 of one first grain boundary 7A and reaching a second intermediate portion 12 of another first grain boundary 7B.

A lithium ion conductive solid electrolyte or an all-solid-state battery. The lithium ion conductive solid electrolyte satisfies any of (I) to (III): (I) having a crystal structure based on LiTa.sub.2PO.sub.8 and a crystal structure based on at least one compound selected from LiTa.sub.3O.sub.8, Ta.sub.2O.sub.5, and TaPO.sub.5; (II) being represented by the stoichiometric formula of Li.sub.a1Ta.sub.b1B.sub.c1P.sub.d1O.sub.e1 where 0.5<a1<2.0, 1.0<b1≤2.0, 0<c1<0.5, 0.5<d1<1.0, and 5.0<e1≤8.0; (III) being represented by the stoichiometric formula of Li.sub.a2Ta.sub.b2Ma.sub.c2B.sub.d2P.sub.e2O.sub.f2 where 0.5<a2<2.0, 1.0<b2≤2.0, 0<c2<0.5, 0<d2<0.5, 0.5<e2<1.0, and 5.0<f2≤8.0, and Ma is one or more elements selected from the group consisting of Nb, Zr, Ga, Sn, Hf, Bi, W, Mo, Si, Al, and Ge.

A positive electrode active material for a nonaqueous electrolyte secondary battery which includes a secondary particle of a lithium transition metal oxide, the secondary particle being formed by coagulation of primary particles of the lithium transition metal oxide; secondary particles of a rare earth compound, the secondary particles each being formed by coagulation of primary particles of the rare earth compound; and particles of an alkali-metal fluoride. The secondary particles of the rare earth compound are each deposited on a groove between a pair of adjacent primary particles which is formed in a surface of the secondary particle of the lithium transition metal oxide so as to come into contact with both of the pair of adjacent primary particles in the groove. The particles of the alkali-metal fluoride are deposited on the surface of the secondary particle of the lithium transition metal oxide.

A field grading composite body includes a polymeric matrix and a particulate filler distributed within the polymeric matrix. Particles of the particulate filler include a core formed from a semiconductor material, an oxide mixed layer deposited on the core, and conducting oxide layer. The conducting oxide layer deposited on the oxide mixed layer to provide an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

A field grading composite body includes a polymeric matrix and a particulate filler distributed within the polymeric matrix. Particles of the particulate filler include a core formed from a semiconductor material, an oxide mixed layer deposited on the core, and conducting oxide layer. The conducting oxide layer deposited on the oxide mixed layer to provide an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

The present disclosure relates to transparent conducting films (TCF). In particular, the disclosed TCF are transparent to ultraviolet (UV) light. The TCF can be grown by radio frequency (RF) sputtering and remain in the advantageous perovskite phase. Optical stacks made of substrates with deposited TCF are also disclosed.

A composite ceramic including: a lithium garnet major phase; and a grain growth inhibitor minor phase, as defined herein. Also disclosed is a method of making composite ceramic, pellets and tapes thereof, a solid electrolyte, and an electrochemical device including the solid electrolyte, as defined herein.

A mixed conductor, a method of preparing the same, and a cathode, a lithium-air battery, and an electrochemical device each including the mixed conductor. The mixed conductor is represented by Formula 1 and having electronic conductivity and ionic conductivity:

Li.sub.xMO.sub.2-δ  Formula 1 wherein, in Formula 1, M is a Group 4 element, a Group 5 element, a Group 6 element, a Group 7 element, a Group 8 element, a Group 10 element, a Group 11 element, a Group 12 element, or a combination thereof, and 0<x<1 and 0≤δ≤1 are satisfied.