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.

A method for manufacturing an ion conductor including LiCB.sub.9H.sub.10 and LiCB.sub.11H.sub.12 is provided. The method includes mixing LiCB.sub.9H.sub.10 and LiCB.sub.11H.sub.12 in a molar ratio of LiCB.sub.9H.sub.10/LiCB.sub.11H.sub.12=1.1 to 20. An ion conductor including lithium (Li), carbon (C), boron (B) and hydrogen (H) is also provided. The ion conductor has X-ray diffraction peaks at at least 2θ=14.9±0.3 deg, 16.4±0.3 deg and 17.1±0.5 deg in X ray diffraction measurement at 25° C., and has an intensity ratio (B/A) of 1.0 to 20 as calculated from A=(X-ray diffraction intensity at 16.4±0.3 deg)−(X-ray diffraction intensity at 20 deg) and B=(X-ray diffraction intensity at 17.1±0.5 deg)−(X-ray diffraction intensity at 20 deg).

Set forth herein are compositions comprising A.(LiBH.sub.4).B.(LiX).C.(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.(LiBH.sub.4).B.(LiX).C.(LiNH.sub.2) compositions. Also disclosed herein are electrochemical devices which incorporate A.(LiBH.sub.4).B.(LiX).C.(LiNH.sub.2) compositions and other materials.

Provided is an ionic conductor with which adhesion between particles can be enhanced simply by pressure-molding a powder without using sulfide ionic conductors and without performing firing or vapor deposition, and which can exhibit a high lithium ionic conductivity. This ionic conductor contains, in addition to an oxide lithium ionic conductor, a complex hydride.

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.

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 process for obtaining M.sup.1-BH.sub.4, the process comprising contacting M.sup.1-BO.sub.2 with a metal M.sup.2 in the presence of molecular hydrogen (H.sub.2) under conditions permitting the formation of M.sup.1-BH.sub.4 and M.sup.2-oxide, wherein the M.sup.1 is a metal selected from column I of the periodic table of elements or alloys of metals selected from column I of the periodic table of elements and M.sup.2 is a metal or an alloy of metals selected from column II of the periodic table of elements, provided that M.sup.2 is not Mg and M.sup.1 is different from M.sup.2.

The process for obtaining M.sup.1-BH.sub.4, the process comprising contacting M.sup.1-BO.sub.2 with a metal M.sup.2 in the presence of molecular hydrogen (H.sub.2) under conditions permitting the formation of M.sup.1-BH.sub.4 and M.sup.2-oxide, wherein the M.sup.1 is a metal selected from column I of the periodic table of elements or alloys of metals selected from column I of the periodic table of elements and M.sup.2 is a metal or an alloy of metals selected from column II of the periodic table of elements, provided that M.sup.2 is not Mg and M.sup.1 is different from M.sup.2.

The present invention relates to a manufactured graphene/metal or metalloid core-shell composite and manufacturing method thereof. The method comprising: using a modified graphene oxide as a base, then performing concentration and steam drying followed by organic solvent replacement to obtain a modified graphene oxide organic solvent; using a liquid-phase self-assembly method to coat the modified graphene oxide onto a surface of the metal or metalloid to form a graphene/metal or metalloid coated particle solution, then filtering and drying to obtain the graphene metal/metalloid core-shell composite. The method improves upon a conventional organic and inorganic material coating technique, and reduces an impact of a water-based solvent and high temperature on a highly reactive metal and metalloid, thereby expanding the feasibility of the coating technique and addressing a barrier of applicability of graphene and reactive metal or metalloid in the field of energetic materials.