A lithium ion conductive solid electrolyte material, a lithium ion conductive solid electrolyte, a method for producing the same, or an all-solid-state battery; and the method for producing a lithium ion conductive solid electrolyte material having a crystal structure based on LiTa.sub.2PO.sub.8 and having at least Li, Ta, P, O, and Zr as constituent elements. The method includes a primary pulverization step of pulverizing a raw material to obtain a primary pulverized product, a firing step of firing the primary pulverized product to obtain a primary fired product, and a secondary pulverization step of pulverizing the primary fired product by using a ball mill to obtain a lithium ion conductive solid electrolyte material.

Provided is a process and an apparatus for purifying boron nitride nanotube (BNNT) materials. The process involves the use of a halogen gas to remove halogen-reactive impurities from boron nitride nanotube (BNNT) materials in a single step with minimal interactions to produce structurally pristine BNNT. Gaseous byproducts are produced that 5 can be removed without the need for solution phase treatments. Yield efficiencies and purity of recovered BNNT are high compared to the other known methods of purification for BNNT material.

To provide a composition for a three-dimensional integrated circuit capable of forming a filling interlayer excellent in thermal conductivity also in a thickness direction, using agglomerated boron nitride particles excellent in the isotropy of thermal conductivity, disintegration resistance and kneading property with a resin. A composition for a three-dimensional integrated circuit, comprising agglomerated boron nitride particles which have a specific surface area of at least 10 m.sup.2/g, the surface of which is constituted by boron nitride primary particles having an average particle size of at least 0.05 m and at most 1 m, and which are spherical, and a resin (A) having a melt viscosity at 120 C. of at most 100 Pa.Math.s.

A method of purifying ammonia borane is provided in which crude ammonia borane is dissolved in an organic solvent, such as an ether, and mixed with a basic aqueous solution to form a two-phase system. The pH of the aqueous solution and the temperature are adjusted to increase the solubility of the impurities and decrease the solubility of the ammonia borane in the basic aqueous solution, without causing decomposition of the ammonia borane. The impurities are separated from the crude ammonia borane solution, the mixture is phase-separated and the dissolved ammonia borane is isolated from the organic solvent fraction. High purity ammonia borane is obtained.

A method of preparing borosulfate materials avoids the need for fuming sulfuric acid, also known as oleum. Instead, B(OH).sub.3 present in solution in concentrated sulfuric acid at 5% to 15% by weight is reacted with a cation source at 100-250 C. under dynamic vacuum while in connection with a receiving vessel comprising a desiccant and separate from the reaction vessel, thereby causing formation of a borosulfate material in the reaction vessel while eliminated water is collected in the receiving vessel.

A method for synthesizing ammonia borane includes (a) preparing a reaction mixture in one or more solvents, the reaction mixture containing sodium borohydride, at least one ammonium salt, and ammonia; and (b) incubating the reaction mixture at temperatures between about 0 C. to about room temperature in an ambient air environment under conditions sufficient to form ammonia borane. Methods for synthesizing ethylenediamine bisborane, and methods for dehydrogenation of ethylenediamine bisborane are also described.

A method for synthesizing ammonia borane includes (a) preparing a reaction mixture in one or more solvents, the reaction mixture containing sodium borohydride, at least one ammonium salt, and ammonia; and (b) incubating the reaction mixture at temperatures between about 0 C. to about room temperature in an ambient air environment under conditions sufficient to form ammonia borane. Methods for synthesizing ethylenediamine bisborane, and methods for dehydrogenation of ethylenediamine bisborane are also described.

The present invention relates to solid materials which are obtainable by melt-quenching mixtures of lithium sulphide, boron sulphide and boron oxide, thereby forming a glassy solid which is suitable for use as a lithium-ion conducting electrolyte. These sulphide based lithium-ion conducting solid electrolytes exhibit a large thermal stability as supported by the large T.sub.x, in particular a T.sub.x of more than 100 C.

The present invention relates to solid materials which are obtainable by melt-quenching mixtures of lithium sulphide, boron sulphide and boron oxide, thereby forming a glassy solid which is suitable for use as a lithium-ion conducting electrolyte. These sulphide based lithium-ion conducting solid electrolytes exhibit a large thermal stability as supported by the large T.sub.x, in particular a T.sub.x of more than 100 C.

Use of a pyrosulfate-boron trifluoride composite metal salt in an electrolyte solution. The use of the pyrosulfate-boron trifluoride composite metal salt having at least one structure is added to an electrolyte solution at an addition amount of 0.1 wt % to 15.0 wt %. The pyrosulfate-boron trifluoride composite metal salt is obtained by means of the reaction of a pyrosulfate and boron trifluoride gas or a boron trifluoride complex. A pyrosulfate-boron trifluoride composite lithium salt is further applied to a lithium-ion secondary battery including a negative electrode containing an active material with a specific surface area of 0.1 m.sup.2/g to 20 m.sup.2/g.