Abstract: A non-aqueous electrolyte secondary battery that has a low initial resistance and an increase in resistance after charging and discharging is suppressed. The secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer, which contains a lithium composite oxide having a layered structure. The lithium composite oxide is a porous particle. A surface of the porous particle includes a layer having a rock salt type structure. A thickness of the layer is not less than 5 nm and not more than 80 nm. A void ratio of the porous particle is not less than 15% and not more than 48%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle includes a coating of lithium tungstate.

Abstract: A non-aqueous electrolyte secondary battery is obtained using a lithium composite oxide having a layered structure in a positive electrode active substance. An increase in resistance following repeated charging and discharging is suppressed. The battery includes a positive electrode provided with a positive electrode active substance layer, a negative electrode and a non-aqueous electrolyte. The positive electrode active substance layer contains a porous particle lithium composite oxide having a layered structure. The average void ratio of the porous particle is not less than 12% but not more than 50%, and it contains two or more voids having diameters that are at least 8% of its particle diameter. The surface of the porous particle is provided with a coating of lithium tungstate. The coverage ratio of the surface of the porous particle by the lithium tungstate is not less than 10% but not more than 65%.

Abstract: Provided is a method for enabling recovery of metal element leaching capacity of a deep eutectic solvent used for leaching a metal element from an ore containing the metal element. A method for recycling a hydrophobic deep eutectic solvent disclosed here includes: preparing a hydrophobic deep eutectic solvent used for leaching a metal element from an ore containing the metal element; and bringing the hydrophobic deep eutectic solvent and hydrochloric acid into contact with each other. In the hydrophobic deep eutectic solvent, a hydrogen bond donor is a carboxy group-containing compound, and a hydrogen bond acceptor is chloride salt. The amount of use of the hydrochloric acid is such that hydrogen chloride is 1 mole or more with respect to 1 mole of the hydrogen bond acceptor.

Abstract: A non-aqueous electrolyte secondary battery is obtained using a lithium composite oxide having a layered structure in a positive electrode active substance. An increase in resistance following repeated charging and discharging is suppressed. The battery includes a positive electrode provided with a positive electrode active substance layer, a negative electrode and a non-aqueous electrolyte. The positive electrode active substance layer contains a porous particle lithium composite oxide having a layered structure. The average void ratio of the porous particle is not less than 12% but not more than 50%, and it contains two or more voids having diameters that are at least 8% of its particle diameter. The surface of the porous particle is provided with a coating of lithium tungstate. The coverage ratio of the surface of the porous particle by the lithium tungstate is not less than 10% but not more than 65%.

Abstract: A non-aqueous electrolyte secondary battery which is obtained using a lithium composite oxide having a layered structure and coated with a tungsten-containing compound in a positive electrode active substance, and which has a low initial resistance, and in which an increase in resistance following repeated charging and discharging is suppressed. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer containing a lithium composite oxide having a layered structure. The lithium composite oxide includes a porous particle having a void ratio of not less than 20% but not more than 50%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle is provided with a coating containing tungsten oxide and lithium tungstate.

Abstract: A non-aqueous electrolyte secondary battery which is obtained using a lithium composite oxide having a layered structure and coated with a tungsten-containing compound in a positive electrode active substance, and which has a low initial resistance, and in which an increase in resistance following repeated charging and discharging is suppressed. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer containing a lithium composite oxide having a layered structure. The lithium composite oxide includes a porous particle having a void ratio of not less than 20% but not more than 50%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle is provided with a coating containing tungsten oxide and lithium tungstate.

Abstract: Provided is a nonaqueous electrolyte secondary battery with a positive electrode active material that contains an excess of Li and has a layered structure, the nonaqueous electrolyte secondary battery having a high output and enabling prevention of gelation of the positive electrode active material layer-forming paste during production. The herein disclosed nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer contains a lithium composite oxide having a layered structure as a positive electrode active material. The compositional ratio of the lithium atom to the metal atom other than a lithium atom contained in the lithium composite oxide is greater than 1. The lithium composite oxide is in the form of porous particles.

Abstract: A positive electrode for a lithium-ion secondary battery includes a positive electrode active material including tungsten. In measurement results of the positive electrode, WO2, and WO3 by XAFS analysis, spectra of rising positions of peaks of L-absorption edges of the tungsten included in the positive electrode active material, tungsten included in WO2, and tungsten included in WO3 satisfy (a?b)/(c?b)?0.86. The rising positions are the range of 10,200 eV to 10,205 eV, “a” represents energy in a portion where the slope of a spectrum is steepest in the rising position in the measurement result of the positive electrode, “A” represents spectral intensity for a in the measurement result of the positive electrode, “b” represents energy in a portion where spectral intensity is A in a measurement result of WO2, and “c” represents energy in a portion where spectral intensity is A in a measurement result of WO3.

Abstract: The present disclosure provides a positive electrode active material which can impart an excellent low temperature output characteristic to a nonaqueous electrolyte secondary battery, and can suppress an increase in resistance after cycle charging and discharging. The positive electrode active material herein disclosed includes a core part including a lithium transition metal composite oxide, and a coating part including a titanium-containing compound on at least a partial surface of the core part. The coating part includes brookite type TiO2 and a lithium titanium (LiTi) composite oxide including lithium (Li) and titanium (Ti) as titanium-containing compounds, and at least part of titanium (Ti) of the titanium-containing compound is incorporated in a solid solution in the surface of the core part.

Abstract: The present disclosure provides a positive electrode active material capable of imparting a nonaqueous electrolyte secondary battery with excellent output characteristic and cycle characteristic. The positive electrode active material herein disclosed includes a core part including a lithium composite oxide, a first region formed on at least a partial surface of the core part, and including tungsten (W), and a second region formed on at least a partial surface of the first region, and including titanium (Ti). The W concentration of the first region with TEM-EDX analysis is higher than the W concentration of the core part.

Abstract: A positive electrode active material is provided, which is a positive electrode active material having a coating of TiO2 and being able to reduce the reaction resistance. The coated active material herein disclosed includes a positive electrode active material, and a coating interspersed on a surface of the positive electrode active material. In the coated active material herein disclosed, the coating includes brookite type TiO2.

Abstract: A non-aqueous electrolyte secondary battery which is obtained using a lithium composite oxide having a layered structure and coated with a tungsten-containing compound in a positive electrode active substance, and which has a low initial resistance, and in which an increase in resistance following repeated charging and discharging is suppressed. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer containing a lithium composite oxide having a layered structure. The lithium composite oxide includes a porous particle having a void ratio of not less than 20% but not more than 50%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle is provided with a coating containing tungsten oxide and lithium tungstate.

Abstract: Provided is a nonaqueous electrolyte secondary battery with a positive electrode active material that contains an excess of Li and has a layered structure, the nonaqueous electrolyte secondary battery having a high output and enabling prevention of gelation of the positive electrode active material layer-forming paste during production. The herein disclosed nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer contains a lithium composite oxide having a layered structure as a positive electrode active material. The compositional ratio of the lithium atom to the metal atom other than a lithium atom contained in the lithium composite oxide is greater than 1. The lithium composite oxide is in the form of porous particles.

Abstract: A non-aqueous electrolyte secondary battery is obtained using a lithium composite oxide having a layered structure in a positive electrode active substance. An increase in resistance following repeated charging and discharging is suppressed. The battery includes a positive electrode provided with a positive electrode active substance layer, a negative electrode and a non-aqueous electrolyte. The positive electrode active substance layer contains a porous particle lithium composite oxide having a layered structure. The average void ratio of the porous particle is not less than 12% but not more than 50%, and it contains two or more voids having diameters that are at least 8% of its particle diameter. The surface of the porous particle is provided with a coating of lithium tungstate. The coverage ratio of the surface of the porous particle by the lithium tungstate is not less than 10% but not more than 65%.

Abstract: A non-aqueous electrolyte secondary battery that has a low initial resistance and an increase in resistance after charging and discharging is suppressed. The secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer, which contains a lithium composite oxide having a layered structure. The lithium composite oxide is a porous particle. A surface of the porous particle includes a layer having a rock salt type structure. A thickness of the layer is not less than 5 nm and not more than 80 nm. A void ratio of the porous particle is not less than 15% and not more than 48%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle includes a coating of lithium tungstate.

Abstract: A nonaqueous electrolyte secondary battery uses, as a positive electrode active material, a lithium composite oxide having a layered structure and coated with lithium tungstate, and has a low resistance. The nonaqueous electrolyte secondary battery includes positive and negative electrodes and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer containing a lithium composite oxide having a layered structure as a positive electrode active material. The lithium composite oxide is in the form of porous particles, each having at least two voids each having a percentage of a void area with respect to the area occupied by each of the particles in its cross-sectional view of at least 1%. Each porous particle has a void connecting the particle interior to the surface and having an opening with a diameter of at least 100 nm. Each porous particle has a lithium tungstate coating on its surface.

Abstract: The present disclosure can bring excellent output characteristics to a nonaqueous electrolyte secondary battery that uses a cathode active material containing tungsten while desired durability is secured. The battery of the present disclosure includes a cathode, an anode, and a nonaqueous electrolyte. The cathode includes a cathode active material layer that contains a granular cathode active material. The cathode active material includes a core part that contains a lithium-transition metal composite oxide of a layered structure; a tungsten-concentrated layer that is formed over a surface of the core part and has a higher tungsten concentration than in the core part; and a lithium-tungsten compound particle that adheres to at least part of a surface of the tungsten-concentrated layer and contains tungsten and lithium. In the battery of the present disclosure, the tungsten-concentrated layer has an amorphous structure. This can bring excellent output characteristics while desired durability is secured.