The present application provides a method for producing an ion conductor containing Li2B12H12 and LiBH4, which includes obtaining a mixture by mixing LiBH4 and B10H14 at a molar ratio LiBH4/B10H14 of from 2.1 to 4.3; and subjecting the mixture to a heat treatment.

The present application provides a method for producing an ion conductor containing Li2B12H12 and LiBH4, which includes obtaining a mixture by mixing LiBH4 and B10H14 at a molar ratio LiBH4/B10H14 of from 2.1 to 4.3; and subjecting the mixture to a heat treatment.

The present disclosure relates to a method for producing a tetrahydroborate, the method including a plasma treatment step of exposing a borate to a hydrogen plasma.

Set forth herein are compositions comprising A.Math.(LiBH.sub.4).Math.B.Math.(LiX).Math.C.Math.(LiNH.sub.2), wherein X is fluorine, bromine, chloride, iodine, or a combination thereof, and wherein 0.1≤A≤3, 0.1≤B≤4, and 0≤C≤9 that are suitable for use as solid electrolyte separators in lithium electrochemical devices. Also set forth herein are methods of making A.Math.(LiBH.sub.4).Math.B.Math.(LiX).Math.C.Math.(LiNH.sub.2) compositions. Also disclosed herein are electrochemical devices which incorporate A.Math.(LiBH.sub.4).Math.B.Math.(LiX).Math.C.Math.(LiNH.sub.2) compositions and other

A method for preparing lithium borohydride by means of room temperature solid phase ball milling, comprising the following steps: uniformly mixing a magnesium-containing reducing agent and a lithium metaborate-containing reducing material under a non-oxidizing atmosphere at room temperature, performing solid phase ball milling, isolating and purifying to obtain lithium borohydride. The method has the advantages of having a simple process, having a controllable and adjustable reaction procedure, having mild reaction conditions, energy consumption being low, costs being low, and output being high, while creating no pollution, being safe and cyclically using boron resources, having important practical significance.

Provided is a method for producing sodium borohydride. An aluminum powder and a fluoride powder are mixed, and a pretreatment thereof is carried out at 100° C. or higher and 330° C. or lower; and after the pretreatment, a sodium borate is added and mixed, and the resulting mixture is charged into a tightly sealed vessel; and then after a hydrogen gas is introduced thereto, a heat treatment is carried out by heating the tightly sealed vessel at 490° C. or higher and 560° C. or lower.

Provided is a method for producing sodium borohydride. An aluminum powder and a fluoride powder are mixed, and a pretreatment thereof is carried out at 100° C. or higher and 330° C. or lower; and after the pretreatment, a sodium borate is added and mixed, and the resulting mixture is charged into a tightly sealed vessel; and then after a hydrogen gas is introduced thereto, a heat treatment is carried out by heating the tightly sealed vessel at 490° C. or higher and 560° C. or lower.

Provided is a method for producing sodium borohydride. At a time when a sodium borate, an aluminum powder, and a fluoride powder are mixed and caused to react in a tightly sealed vessel filled with a hydrogen gas at a temperature of 560° C. or lower, stirring using a stirrer is carried out in the tightly sealed vessel, and a stirring height ratio (X) expressed by a following formula (I) is 75% or more, in which (a) is a minimum clearance between the stirrer and the lowest part of the tightly sealed vessel in a gravity direction, and (b) is a raw material charged height when a raw material is charged into the tightly sealed vessel:

X=[(b−a)/b]×100  Formula (I)

Provided is a method for producing sodium borohydride. At a time when a sodium borate, an aluminum powder, and a fluoride powder are mixed and caused to react in a tightly sealed vessel filled with a hydrogen gas at a temperature of 560° C. or lower, stirring using a stirrer is carried out in the tightly sealed vessel, and a stirring height ratio (X) expressed by a following formula (I) is 75% or more, in which (a) is a minimum clearance between the stirrer and the lowest part of the tightly sealed vessel in a gravity direction, and (b) is a raw material charged height when a raw material is charged into the tightly sealed vessel:

X=[(b−a)/b]×100  Formula (I)

The present invention discloses a method for directly synthesizing sodium borohydride by solid-state ball milling at room temperature, which comprises: performing solid-state ball milling on a mixture of a reducing agent and a reduced material by using a ball mill under room temperature, and performing purification to obtain sodium borohydride. The reducing agent comprises one or more of magnesium, magnesium hydride, aluminum, calcium, and magnesium silicide. The reduced material is sodium metaborate containing crystallization water or sodium metaborate, or is a mixture of sodium metaborate containing crystallization water and sodium metaborate. The solid-state milling is performed in a mixed atmosphere of argon and hydrogen, or an argon atmosphere, or a hydrogen atmosphere. The present invention has a simple process, a controllable and adjustable reaction procedure, mild reaction conditions, low energy consumption, low costs, high yield, no pollution, good safety, and easy industrial production.