Panasonic Intellectual Property Management Co., Ltd.

Ryuichi Natsui

Kensuke Nakura

Nobuhiko Hojo

Issei Ikeuchi

Takayuki Ishikawa

Takayuki Nakatsutsumi

Shuhei Uchida

Junko Matsushita

Takanori Omae

Izuru Sasaki

Takuji Tsujita

Hirotetsu Suzuki

Mitsuhiro Hibino

Kazuyoshi Honda

Masahisa Fujimoto

Akinobu Miyazaki

Akira Kano

Yuta Sugimoto

Yu Otsuka

Kazuko Asano

This charging method is A method for charging a nonaqueous electrolyte secondary cell containing a lithium-rich positive-electrode active material. When constant-current charging is performed to a predetermined voltage Vwhich is equal to or higher than a setting voltage Vand then constant-current discharging is performed to a predetermined voltage VV<V≤Vis satisfied. Cell capacity Cat Vcell capacity Cat Vand cell capacity Cat Vsatisfy 0.99C≤C<C

Method for charging nonaqueous electrolyte secondary cell having lithium-transition metal positive electrode active material

A positive electrode active material includes a first lithium composite oxide and a second lithium composite oxide that covers at least a part of the surface of the first lithium composite oxide. The first lithium composite oxide includes at least one selected from the group consisting of F, Cl, N, and S. The first lithium composite oxide has a crystal structure belonging to a layered structure. The second lithium composite oxide has a crystal structure belonging to space group Fd-3m. The positive electrode active material has an integrated intensity ratio I)/Iof greater than or equal to 0.05 and less than or equal to 0.90.

Positive electrode active material and battery including the same

This positive electrode active material is for a secondary battery and contains a lithium transition metal complex oxide. The lithium transition metal complex oxide is represented by general formula LiMnNiSbOF(x+y+z+a≤b+c=2, 1≤x≤1.2, 0.4≤y≤0.8, 0≤z≤0.4, 0<a<0.01, and 1.8<b<2 are satisfied) and does not include Co.

Positive electrode active material for secondary battery, and secondary battery

A positive electrode active material according to the present disclosure includes a lithium composite oxide that is a multiphase mixture including a first phase having a crystal structure belonging to a monoclinic crystal (e.g., space group C2/m), a second phase having a crystal structure belonging to a hexagonal crystal (e.g., space group R-3m), and a third phase having a crystal structure belonging to a cubic crystal (e.g., space group Fm-3m or space group Fd-3m). In addition, a battery according to an aspect of the present disclosure includes a positive electrode containing the positive electrode active material, a negative electrode, and an electrolyte. The positive electrode active material according to the present disclosure improves the capacity of the battery.

Positive electrode active material and battery comprising the same

A positive electrode active material includes a lithium composite oxide having a crystal structure belonging to the space group Fd-3m and has an integrated intensity ratio I/Iof greater than or equal to 0.05 and less than or equal to 0.90 and an integrated intensity ratio I/Iof greater than or equal to 0.8 and less than or equal to 2.0. The integrated intensity ratio I/Iis a ratio of an integrated intensity Ito an integrated intensity I. The integrated intensity ratio I/Iis a ratio of an integrated intensity Ito an integrated intensity I. The integrated intensity Iis an integrated intensity of a maximum peak present in a range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the positive electrode active material.

A positive electrode active material according to the present disclosure includes a lithium composite oxide. The lithium composite oxide is a multiphase mixture including a first phase having a crystal structure belonging to space group C2/m and a second phase having a crystal structure belonging to space group R-3m and includes at least one selected from the group consisting of F, Cl, N, and S. In an XRD pattern of the lithium composite oxide, the integrated intensity ratio I/Iof a second maximum peak present in a diffraction angle 2θ range of greater than or equal to 20° and less than or equal to 23° to a first maximum peak present in a diffraction angle 2θ range of greater than or equal to 18° and less than or equal to 20° satisfies 0.05≤I/I≤0.26.

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.

A positive electrode active material according to the present disclosure includes a lithium composite oxide that contains first particles having a crystal structure belonging to space group R-3m and second particles having a crystal structure belonging to space group C2/m. The crystal structure of the second particles has a larger amount of cation mixing than the crystal structure of the first particles. The second particles have a smaller particle size than the first particles. Mathematical Formula 0.05≤integrated intensity ratio I/I≤0.99 is satisfied. The integrated intensity ratio I/Iis a ratio of the integrated intensity Ito the integrated intensity I. The integrated intensity Iis the integrated intensity of a maximum peak present in the range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the lithium composite oxide.

Positive electrode active material and battery including same

A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including an additive. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LiMeOF, where, Me is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr; and subscripts x, y, &#x3b1;, and &#x3b2; satisfy the following requirements: 1.7&#x2264;x&#x2264;2.2, 0.8&#x2264;y&#x2264;1.3, 1&#x2264;&#x3b1;&#x2264;2.5, and 0.5&#x2264;&#x3b2;&#x2264;2. The additive is at least one selected from dinitrile compounds and diisocyanate compounds.

Battery

A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including a lithium hexafluorophosphate and an additive. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LiMeOF. The additive is at least one selected from the group consisting of difluorophosphates, tetrafluoroborates, bis(oxalate)borate salts, bis(trifluoromethanesulfonyl)imide salts, and bis(fluorosulfonyl)imide salts.

A battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution including a nonaqueous solvent. The positive electrode active material includes a compound having a crystal structure belonging to a space group FM3-M and represented by Compositional Formula (1): LiMeOF, where, Me is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr; and subscripts x, y, &#x3b1;, and &#x3b2; satisfy the following requirements: 1.7&#x2264;x&#x2264;2.2, 0.8&#x2264;y&#x2264;1.3, 1&#x2264;&#x3b1;&#x2264;2.5, and 0.5&#x2264;&#x3b2;&#x2264;2. The nonaqueous solvent includes a solvent having at least one fluoro group.

Provided is a positive electrode material which further improves charge/discharge efficiency. The positive electrode material according to the present disclosure includes a positive electrode active material and a first solid electrolyte material. The first solid electrolyte material includes Li, M, and X, and does not include sulfur. M is at least one selected from the group consisting of metalloid elements and metal elements other than Li. X is at least one selected from the group consisting of Cl, Br, and I. The positive electrode active material includes a metal oxyfluoride.

Positive electrode material and battery using same

A positive-electrode active material containing a compound that has a crystal structure belonging to the space group FM-3M and is represented by the composition formula (1):LiMeOF&#x2003;&#x2003;(1) wherein Me denotes one or two or more elements selected from the group consisting of Mn, Co, Ni, Fe, and Al, and the following conditions are satisfied. 1.3&#x2264;x&#x2264;2.2, 0.8&#x2264;y&#x2264;1.3, 1&#x2264;&#x3b1;&#x2264;2.93, 0.07&#x2264;&#x3b2;&#x2264;2.

Positive-electrode active material and battery

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

Provided is a battery including: a positive electrode containing a positive electrode active material; a negative electrode; and an electrolyte solution containing a nonaqueous solvent. The positive electrode active material contains a compound represented by composition formula (1) below and having a crystal structure belonging to space group FM3-M: LiMeOF. (1) Here, Me is one or two or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and C. x, y, &#x3b1;, and &#x3b2; satisfy the following conditions: 1.7&#x2264;x&#x2264;2.2, 0.8&#x2264;y&#x2264;1.3, 1&#x2264;&#x3b1;&#x2264;2.5, and 0.5&#x2264;&#x3b2;&#x2264;2, respectively. The nonaqueous solvent includes at least one solvent selected from hydrofluoroethers, phosphazenes, phosphates, and perfluoropolyethers.

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Osaka, Japan

Ryuichi Natsui