The use of a C10~C34 fatty acids compound in the preparation of a the electrode materials for lithium-ion battery improves the coating uniformity of electrode materials prepared with solid-state method. The fatty acid provided by the invention is a dispersant, which achieves the uniformly dispersion of the coating material on the surface of battery material, and significantly increases the coating uniformity of the electrode material coated with solid-state method, it greatly improves the feasibility of manufacturing the electrode material of lithium-ion battery with solid-state method, and is conducive to the more economical and simpler manufacture of electrode material.

Various lithium cobalt oxides materials doped with one or more metal dopants having a chemical formula of Li.sub.xCo.sub.yO.sub.z (doped Me1.sub.a Me2.sub.b Me3.sub.c . . . MeN.sub.n), and method and apparatus of producing the various lithium cobalt oxides materials are provided. The method includes adjusting a molar ratio M.sub.LiSalt:M.sub.CoSalt:M.sub.Me1Salt:M.sub.Me2Salt:M.sub.Me3Salt:. . . M.sub.MeNSalt of a lithium-containing salt, a cobalt-containing salt and one or more metal-dopant-containing salts within a liquid mixture to be equivalent to a ratio of x:y:a:b:c: . . . n , drying a mist of the liquid mixture in the presence of a gas to form a gas-solid mixture, separating the gas-solid mixture into one or more solid particles of an oxide material, and annealing the solid particles of the oxide material in the presence of another gas flow to obtain crystalized particles of the lithium cobalt oxide material. The process system has a mist generator, a drying chamber, one or more gas-solid separator, and one or more reactors.

There is provided a method of collecting and reusing an active material from a positive electrode scrap. The method of reusing a positive electrode active material according to the present disclosure includes (a-1) dry-milling a positive electrode scrap comprising an active material layer on a current collector to form the active material layer into a powdered state and separate the current collector, (a-2) thermally treating the active material layer in powder form in air for thermal decomposition of a binder and a conductive material in the active material layer, to collect an active material, (b) washing the active material collected from the step (a-2) with a lithium compound solution which is basic in an aqueous solution and drying, and (c) annealing the active material washed from the step (b) with an addition of a lithium precursor to obtain a reusable active material.

The present invention relates to an anode active material for lithium secondary battery and a lithium secondary battery including the same, and more specifically it relates to an anode active material for lithium secondary battery in which the a lithium ion diffusion path in the primary particles is formed to exhibit specific directivity, and a lithium secondary battery including the same. The cathode active material for lithium secondary battery of the present invention has a lithium ion diffusion path exhibiting specific directivity in the primary particles and the secondary particles, thus not only the conduction velocity of the lithium ion is fast and the lithium ion conductivity is high but also the cycle characteristics are improved as the crystal structure hardly collapses despite repeated charging and discharging.

A lithium secondary battery is produced by employing a charging method where a positive electrode upon charging has a maximum achieved potential of 4.3 V (vs. Li/Li.sup.+) or lower. The lithium secondary battery contains an active material including a solid solution of a lithium transition metal composite oxide having an α-NaFeO.sub.2-type crystal structure. The solid solution has a diffraction peak observed near 20 to 30° in X-ray diffractometry using CuKα radiation for a monoclinic Li[Li.sub.1/3Mn.sub.2/3]O.sub.2-type before charge-discharge. The lithium secondary battery is charged to reach at least a region with substantially flat fluctuation of potential appearing in a positive electrode potential region exceeding 4.3 V (vs. Li/Li.sup.+) and 4.8 V (vs. Li/Li.sup.+) or lower. A dischargeable electric quantity in a potential region of 4.3 V (vs. Li/Li.sup.+) or lower is 177 mAh/g or higher.

A battery is composed of a positive electrode in which a positive electrode active material layer including a positive electrode active material is formed on a positive electrode collector, a negative electrode in which a negative electrode active material layer including a negative electrode active material is formed on a negative electrode collector, a separator provided between the positive electrode and the negative electrode, and an electrolyte impregnated in the separator. The battery further includes at least one of a heteropoly acid and a heteropoly acid compound as an additive at least in one of the positive electrode, the negative electrode, the separator, and the electrolyte.

A producing method of a solution that contains lithium, at least one of a niobium complex and a titanium complex, and ammonia, wherein an amount of the ammonia in the solution is 0.3 mass % or less. The solution is suitable for forming a coating layer capable of improving battery characteristics of an active material in a battery.

Various lithium cobalt oxides materials having a chemical formula of Li.sub.xCo.sub.yO.sub.z, and method and apparatus of producing the various lithium cobalt oxides materials are provided. The method includes adjusting a molar ratio M.sub.LiSalt:M.sub.CoSalt of a lithium-containing salt, and a cobalt-containing salt within a liquid mixture to be equivalent to a ratio of x:y, drying a mist of the liquid mixture in the presence of a gas to form a gas-solid mixture, separating the gas-solid mixture into one or more solid particles of an oxide material, and annealing the solid particles of the oxide material in the presence of another gas flow to obtain crystallized particles of the lithium cobalt oxide material. The process system has a mist generator, a drying chamber, one or more gas-solid separator, and one or more reactors.

A mixed conductor, a method of preparing the same, and a cathode, a lithium-air battery, and an electrochemical device each including the mixed conductor. The mixed conductor is represented by Formula 1 and having electronic conductivity and ionic conductivity:

Li.sub.xMO.sub.2-δ  Formula 1 wherein, in Formula 1, M is a Group 4 element, a Group 5 element, a Group 6 element, a Group 7 element, a Group 8 element, a Group 10 element, a Group 11 element, a Group 12 element, or a combination thereof, and 0<x<1 and 0≤δ≤1 are satisfied.

A mixed conductor represented by Formula 1:
A.sub.4±xTi.sub.5−yG.sub.zO.sub.12−δ  Formula 1 wherein, in Formula 1, A is a monovalent cation, G is at least one of a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, or a hexavalent cation, with the proviso that G is not Ti or Cr, wherein 0<x<2, 0.3<y<5, 0<z<5, and 0<δ≤3.