This disclosure relates to a rechargeable battery cell comprising an active metal, at least one positive electrode, at least one negative electrode, a housing and an electrolyte, the positive electrode being designed as a high-voltage electrode and the electrolyte being based on SO.sub.2 and at least one first conducting salt having the formula (I), ##STR00001##
M being a metal selected from the group formed by alkali metals, alkaline earth metals, metals of group 12 of the periodic table of the elements, and aluminum; x being an integer from 1 to 3; the substituents R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being selected independently of one another from the group formed by C.sub.1-C.sub.10 alkyl, C.sub.2-C.sub.10 alkenyl, C.sub.2-C.sub.10 alkynyl, C.sub.3-C.sub.10 cycloalkyl, C.sub.6-C.sub.14 aryl and C.sub.5-C.sub.14 heteroaryl; and Z being aluminum or boron.

The present disclosure discloses a method for recycling iron phosphate waste and use thereof. The method includes: mixing the iron phosphate waste with an acid liquid for dissolution to obtain an iron-phosphorus solution; taking a small portion of the iron-phosphorus solution to prepare an iron phosphate precipitating agent; adding the iron phosphate precipitating agent to a remaining portion of the iron-phosphorus solution to react to obtain an iron phosphate dihydrate precipitate; and keeping a portion of the iron phosphate dihydrate precipitate as a precipitating agent for a reaction in a subsequent batch, and preparing a remaining portion of the iron phosphate dihydrate precipitate into anhydrous iron phosphate. In the present disclosure, an iron phosphate precipitating agent is prepared and used for the subsequent preparation of iron phosphate, and iron phosphate obtained in each preparation can be used for the next preparation of iron phosphate.

The present disclosure discloses a method for recycling iron phosphate waste and use thereof. The method includes: mixing the iron phosphate waste with an acid liquid for dissolution to obtain an iron-phosphorus solution; taking a small portion of the iron-phosphorus solution to prepare an iron phosphate precipitating agent; adding the iron phosphate precipitating agent to a remaining portion of the iron-phosphorus solution to react to obtain an iron phosphate dihydrate precipitate; and keeping a portion of the iron phosphate dihydrate precipitate as a precipitating agent for a reaction in a subsequent batch, and preparing a remaining portion of the iron phosphate dihydrate precipitate into anhydrous iron phosphate. In the present disclosure, an iron phosphate precipitating agent is prepared and used for the subsequent preparation of iron phosphate, and iron phosphate obtained in each preparation can be used for the next preparation of iron phosphate.

The ferrite powder of the present invention is a ferrite powder containing a plurality of ferrite particles, wherein the ferrite particles each are a single crystal body having an average particle diameter of 1-2,000 nm, and have a polyhedron shape, and wherein the ferrite particles each contain 2.0-10.0 mass % of Sr, and 55.0-70.0 mass % of Fe.

A mixed conductor represented by Formula 1:

A.sub.1XM.sub.2yO.sub.4Formula 1

wherein, in Formula 1, A is a monovalent cation, and M is at least one of a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, or a hexavalent cation, 0x1, 0y2, and 01, with the proviso that when M includes vanadium, 0<1, and wherein the mixed conductor has an inverse spinel crystal structure.

Embodiments disclosed herein relate to using cobalt (Co) to fine tune the magnetic properties, such as permeability and magnetic loss, of nickel-zinc ferrites to improve the material performance in electronic applications. The method comprises replacing nickel (Ni) with sufficient Co.sup.+2 such that the relaxation peak associated with the Co.sup.+2 substitution and the relaxation peak associated with the nickel to zinc (Ni/Zn) ratio are into near coincidence. When the relaxation peaks overlap, the material permeability can be substantially maximized and magnetic loss substantially minimized. The resulting materials are useful and provide superior performance particularly for devices operating at the 13.56 MHz ISM band.

Disclosed herein are magnetic nanoparticles, compositions and kits comprising the magnetic nanoparticles, methods of making the magnetic nanoparticles, and methods of using the magnetic nanoparticles to enrich biological targets.

One embodiment of the present invention is that in samarium-iron-nitrogen magnet powder, a non-magnetic phase is formed on a surface of the samarium-iron-nitrogen magnet phase, and an arithmetic mean roughness Ra of the surface is 3.5 nm or less.

Magnetodielectric (MD) metamaterials have a magnetodielectric (MD) substrate of a ferrite composition or composite having a characteristic impedance matching an impedance of free space and at least one frequency selective surface (FSS). The FSS has a plurality of frequency selective surface elements disposed in a pattern and supported on the MD substrate. The FSS has a conducting composition and is configured to permit one or more of transmission, reflection, or absorption at a selected resonant frequency or selected frequency band. Articles incorporating magnetodielectric metamaterials are provided.

A positive electrode active material for a sodium secondary battery includes a sodium composite transition metal oxide represented by Formula 1 and having a P3 crystal structure, and a positive electrode and a sodium secondary battery which include the positive electrode active material.

Na.sub.x[Li.sub.aM.sub.1-a]O.sub.2[Formula 1]

wherein M is at least one transition metal, 0.64x0.7, and 0.01a0.1.