A positive-electrode active material contains a lithium composite oxide containing at least one selected from the group consisting of F, Cl, N, and S. The crystal structure of the lithium composite oxide belongs to a space group C2/m. An XRD pattern of the lithium composite oxide comprises a first peak within the first range of 44 degrees to 46 degrees of a diffraction angle 2θ and a second peak within the second range of 18 degrees to 20 degrees of the diffraction angle 2θ. The ratio of the second integrated intensity of the second peak to the first integrated intensity of the first peak is within a range of 0.05 to 0.90.

A positive electrode active material for a lithium secondary battery, comprising a lithium-containing composite metal oxide in the form of secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, each of the secondary particles having on its surface a coating layer, the positive electrode active material satisfying the following requirements (1) to (3): (1) the metal oxide has an α-NaFeO.sub.2 type crystal structure of following formula (A):
Li.sub.a(Ni.sub.bCo.sub.cM.sup.1.sub.1-b-c)O.sub.2  (A)
wherein 0.9≤a≤1.2, 0.9≤b<1, 0<c≤0.1, 0.9<b+c≤1, and M.sup.1 represents at least one optional metal selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In and Sn; (2) the coating layer comprises Li and M.sup.2, wherein M.sup.2 represents at least one optional metal selected from Al, Ti, Zr and W; and (3) the active material has an average secondary particle diameter of 2 to 20 μm, a BET specific surface area of 0.1 to 2.5 m.sup.2/g, and a value of 1.0 to 2.0 as a tamped density/untamped density ratio of the active material.

A method for manufacturing an electrode for an all solid battery including the steps of coating a current collector with a slurry including an active material, a conductive material, and a polyimide-based binder; and melting a solid electrolyte having a melting temperature of 50° C. to 500° C. and applying it onto the coating layer and an electrode manufactured therefrom.

The present disclosure provides a cathode material and a method for preparing the cathode material, a cathode, a lithium ion battery and a vehicle. The cathode material comprises a matrix particle, wherein the matrix particle is a monocrystal particle comprising nickel lithium manganate and nickel cobalt lithium manganate. A position in the matrix particle close to a surface layer is provided with a buffer layer. A content of at least one of elements Ni, Co and Mn in the buffer layer is lower than contents thereof in other positions of the matrix particle. The cathode material has at least one of advantages of relatively high specific capacity, cycling stability, better safety performance and the like, and the buffer layer can alleviate erosion by an electrolyte and inhibit separation of active oxygen.

To provide a secondary battery in which a side reaction does not easily occur at an interface between a positive electrode active material and a solid electrolyte, an interface between the positive electrode active material and a positive electrode current collector, or the like even when charge and discharge are repeated. In one embodiment of the present invention, a buffer layer or a protective layer is provided on a current collector surface or between a current collector layer and an active material layer to prevent deterioration such as oxidation of the current collector. As the buffer layer or the protective layer, it is possible to use a titanium compound such as titanium oxide, titanium oxide in which nitrogen is substituted for part of oxygen, titanium nitride, titanium nitride in which oxygen is substituted for part of nitrogen, or titanium oxynitride (TiO.sub.xN.sub.y, where 0<x<2 and 0<y<1). Titanium nitride is particularly preferable because it has high conductivity and has a high capability of inhibiting oxidation.

A sulfur cathode generated at least in part by in situ electrochemical pulverization of a metallic sulfide compound is provided. The in situ generated sulfur cathode suppresses the unfavorable process of polysulfide shuttling to provide enhanced sulfur cathode performance and is envisioned for use in Li—S, Na—S, K—S, Ca—S, Mg—S or Al—S batteries used to support rechargeable electronic devices and electric vehicles.

A method of treating the surface of a positive electrode active material that is capable of inhibiting a reaction at the interface between a sulfide-based solid electrolyte and the positive electrode active material. A positive electrode active material particle for sulfide-based all-solid-state batteries, the surface of which is reformed, using the method and a sulfide-based all-solid-state battery, the charge/discharge characteristics of which are improved, including the same are also disclosed. The positive electrode active material particle for sulfide-based all-solid-state batteries manufactured using a dry-type method exhibits larger capacity than a positive electrode active material particle for sulfide-based all-solid-state batteries manufactured through a conventional wet-type process. In addition, the manufacturing process is simplified, and the amount of byproducts is reduced.

The present invention provides: an electrode mixture manufacturing method comprising the processes of introducing a first binder, an electrode active material, and a conductive material into an extruder, performing a first mixing of the first binder, the electrode active material, and the conductive material in the extruder, additionally introducing a second binder into the extruder and performing a second mixing, and yielding an electrode mixture resulting from the first mixing and the second mixing; an electrode mixture manufactured thereby; and an electrode manufacturing method using the electrode mixture.

Exemplary embodiments of positive electrode active materials in the form of single particles, and a method of preparing each of them, are provided. The single particles of the exemplary embodiments include single particles of a nickel-based lithium composite metal oxide, having a plurality of crystal grains, each having a size of 180 nm to 300 nm, as analyzed by a Cu Kα X-ray (X-rα). The single particles include a metal doped in the crystal lattice thereof. One embodiment includes a surface coating. The total content of the metal doped in the crystal lattice thereof and the metal of the metal oxide coated on the surface thereof is controlled in the range of 2500 ppm to 6000 ppm.

The invention relates to an electrolyte, which is provided for an alkali-sulfur battery (e.g. for a Li—S battery). The electrolyte contains a non-polar, acyclic and non-fluorinated ether, a polar aprotic organic solvent, and a conducting salt for an alkali-sulfur battery. It has been found that, when such an electrolyte is used in an alkali-sulfur battery, a high-capacity, a low overvoltage, a high cycle stability, and a high Coulomb efficiency can be achieved in the alkali-sulfur battery and, in addition, as compared with an alkali-sulfur battery which contains a fluorinated ether in the electrolyte, a considerably improved gravimetric energy density is obtained. The invention further relates to a battery comprising the electrolyte according to the invention and to uses of the electrolyte according to the invention.