Sony Corporation

Satoshi Fujiki

Yosuke Hosoya

Guohua Li

Asuki Yanagihara

Kazunari Motohashi

Hideki Nakai

Kazuaki Endoh

Yoshihiro Kudo

Hirotaka Fukudome

A secondary battery includes: a cathode including a cathode active material layer on a cathode current collector; an anode; and an electrolytic solution. The cathode active material layer includes spherical active materials each being a secondary particle and planular active materials each being a secondary particle. The spherical active materials are each included in a region closer to the cathode current collector, and the planular active materials are each included in a region farther from the cathode current collector. Primary particles of the spherical active materials have an average particle diameter that is larger than an average particle diameter of primary particles of the planular active materials.

Electrode, secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

A secondary battery includes: a cathode; an anode; and an electrolytic solution. The cathode includes a lithium composite oxide, a first compound, and a second compound. The lithium composite oxide includes lithium (Li) and a transition metal element as constituent elements. The first compound includes a first metal element different from the transition metal element as a constituent element, the first compound existing on a surface and inside of the lithium composite oxide. The second compound includes a second metal element different from the first metal element as a constituent element, the second compound existing on the surface of the lithium composite oxide.

A lithium ion secondary battery includes: a positive electrode; a negative electrode; and an electrolytic solution, at least one of the positive electrode and the negative electrode being capable of storing and releasing lithium ions, and containing an active material that satisfies predetermined conditions.

Lithium ion secondary battery active material, lithium ion secondary battery electrode, lithium ion secondary battery, electronic device, electronic power tool, electric vehicle, and power storage system

Disclosed herein is a positive electrode active material wherein at least one metallic element Mdifferent from a principal transition metal element A is present at least at part of a surface of a lithium-containing transition metal oxide containing the principal transition metal element A, and, further, a compound of a metallic element Mdifferent from the metallic element Mis present in a coating manner or in the vicinity of the lithium-containing transition metal oxide.

Positive electrode active material, positive electrode, and nonaqueous electrolyte cell

A cathode includes a lithium transition metal complex compound including lithium, one, or two or more transition metals, magnesium, and oxygen as constituent elements. In a standardized X-ray absorption spectrum of the lithium transition metal complex compound measured by an X-ray absorption spectroscopic method, a first absorption edge having absorption edge energy E1 in X-ray absorption intensity of about 0.5 exits in a range where X-ray energy is from about 1303 eV to about 1313 eV both inclusive, in a discharged state in which a discharge voltage is about 3.0 V, and a second absorption edge having absorption edge energy E2 in X-ray absorption intensity of about 0.5 exits, in a charged state in which a charge voltage V is from about 4.3 V to about 4.5 V both inclusive. The absorption edge energies E1 and E2 and the charge voltage V satisfy a relation of E2&#x2212;E1&#x2267;(V&#x2212;4.25)&#xd7;4.

Secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic device

A lithium ion secondary battery capable of improving the lithium ion input-output characteristics. An active material capable of storing and releasing lithium ions is a Li complex oxide or a Li complex oxoacid salt. A plurality of primary particles have a particle size distribution with 1 nm&#x3c;D10&#x3c;65 nm, 5 nm&#x3c;D50&#x3c;75 nm, and 50 nm&#x3c;D90&#x3c;100 nm. The maximum peak pore size A in a pore size distribution as measured by a mercury intrusion technique is 10 nm&#x2266;A&#x2266;75 nm. The ratio B/A of the maximum peak pore size A and the crystallite size B is 0.5&#x3c;B/A&#x2266;1.

Lithium ion secondary battery active material, lithium ion secondary battery electrode, lithium ion secondary battery, electronic device, electric power tool, electric vehicle, and power storage system

A positive electrode active material includes: a complex oxide particle containing at least lithium and one or plural transition metals; and a coating layer provided in at least a part of the complex oxide particle, wherein the coating layer contains at least one element M which is different from the principal transition metal constituting the complex oxide particle and which is selected among elements belonging to the Groups 2 to 13, and at least one element X selected among phosphorus (P), silicon (Si) and germanium (Ge), and the element M and the element X show different distribution from each other in the coating layer.

Positive electrode active material, positive electrode using the same and non-aqueous electrolyte secondary battery

Disclosed herein is a positive electrode active material prepared by mixing a lithium-containing compound, a compound containing a transition metal to be put into a solid solution, and a compound containing a metallic element M2 different from the transition metal, and firing the mixture to form composite oxide particles, depositing a compound containing at least one element selected from among sulfur (S), phosphorus (P) and fluorine (F) on surfaces of the particles, and firing the particles, whereby each of the particles is provided with a concentration gradient such that the concentration of the metallic element M2 increases from the center toward the surface of the particle, and at least one element selected from among (S), (P) and (F) is made present in the form of being aggregated at the surfaces of the composite oxide particles.

Growing community of inventors

Fukushima, Japan

Satoshi Fujiki