Panasonic Intellectual Property Management Co., Ltd.

Issei Ikeuchi

Kensuke Nakura

Ryuichi Natsui

Junko Matsushita

Takayuki Ishikawa

Takanori Omae

A positive electrode active material according to the present disclosure includes: a lithium composite oxide which includes Mn and at least one selected from the group consisting of F, Cl, and N, and S. The lithium composite oxide has a crystalline structure which belongs to the space group Fd-3m, and a relationship 1.40≤intensity ratio I/I≤1.90 is satisfied. The intensity ratio I/Iis a ratio of an intensity Ito an intensity I. The intensity Iand the intensity Iare intensities of a first proximity peak and a second proximity peak, respectively, of the Mn in a radial distribution function of the Mn included in the lithium composite oxide.

Positive electrode active material and battery including the same

A positive-electrode active material contains a lithium composite oxide containing manganese. The crystal structure of the lithium composite oxide belongs to a space group Fd-3m. The integrated intensity ratio I/Iof a first peak Ion the (111) plane to a second peak Ion the (400) plane in an XRD pattern of the lithium composite oxide satisfies 0.05&#x2264;I/I&#x2264;0.90.

Positive-electrode active material containing lithium composite oxide, and battery including the same

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 2&#x3b8; and a second peak within the second range of 18 degrees to 20 degrees of the diffraction angle 2&#x3b8;. 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 contains a lithium composite oxide, wherein the lithium composite oxide is a multiphase mixture including a first phase, of which a crystal structure belongs to a space group Fm-3m, and a second phase, of which a crystal structure belongs to a space group Fd-3m; and in an XRD pattern of the lithium composite oxide, the integrated intensity ratio I/Iof a first maximum peak Iwithin a first range of 18 degrees to 20 degrees at a diffraction angle 2&#x3b8; to a second maximum peak Iwithin a second range of 43 degrees to 46 degrees at the diffraction angle 2&#x3b8; satisfies 0.05&#x2264;I/I&#x2264;0.90.

A positive electrode active material includes a lithium composite oxide containing: at least one element selected from the group consisting of fluorine, chlorine, nitrogen, sulfur, bromine, and iodine; and a covering material that covers a surface of the lithium composite oxide. The lithium composite oxide has a crystal structure that belongs to a space group R-3 m. The ratio I/Iof a first integrated intensity Iof a first peak corresponding to a (003) plane to a second integrated intensity Iof a second peak corresponding to a (104) plane in an XRD pattern of the lithium composite oxide satisfies 0.62&#x2264;I/I&#x2264;0.90. The covering material has an electron conductivity of 10S/m or less.

Positive electrode active material containing lithium composite oxide and covering material and battery

A positive electrode active material includes a lithium composite oxide and a covering material that covers a surface of the lithium composite oxide. The covering material has an electron conductivity of 10S/m or less. The lithium composite oxide is a multiphase mixture including a first phase having a first crystal structure that belongs to a space group Fm-3m and a second phase having a second crystal structure that belongs to a space group other than a space group Fm-3m. The ratio I/Iof a first integrated intensity Iof a first maximum peak present at a first diffraction angle 2&#x3b8; of 18&#xb0; or more and 20&#xb0; or less to a second integrated intensity Iof a second maximum peak present at a second diffraction angle 2&#x3b8; of 43&#xb0; or more and 46&#xb0; or less in an XRD pattern of the lithium composite oxide satisfies 0.05&#x2264;I/I&#x2264;0.90.

A positive-electrode active material contains a compound represented by the following composition formula (1):LiMeOX&#x2003;&#x2003;(1)

Positive electrode active material and battery using positive electrode active material

A positive electrode active material comprising: a compound which has a crystal structure belonging to space group Fm-3m and which is represented by the following composition formula: LiMeOX. In the formula, the Me represents one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er. The X represents one element selected from the group consisting of Cl, Br, I, N, and S. The following conditions are satisfied: 0.5&#x2264;x&#x2264;1.5; 0.5&#x2264;y&#x2264;1.0; 1&#x2264;&#x3b1;&#x3c;2; and 0&#x3c;&#x3b2;&#x2264;1.

A positive electrode active material for a battery, the positive electrode active material comprising a compound having a crystal structure of space group Fm-3m and represented by composition formula (1): LiMe1Me2O. . . (1). In the formula, Me1 represents one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er, Me2 represents one or more elements selected from the group consisting of B, Si, and P, and the following conditions are met: 0&#x3c;&#x3b1;; 0&#x3c;&#x3b2;; &#x3b1;+&#x3b2;=y; 0.5&#x2264;x/y&#x2264;3.0; and 1.5&#x2264;x+y&#x2264;2.3.

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Osaka, Japan

Issei Ikeuchi