Tokyo University of Science Foundation

Tokyo University of Science Educational Foundation Administrative Organization

Umicore

Fujifilm Wako Pure Chemical Corporation

Nissan Motor Company Limited

Sumitomo Chemical Company, Limited

Kuraray Co., Ltd.

Gs Yuasa International Ltd.

Jx Nippon Mining Metals Corporation

Wako Pure Chemical Industries, Inc.

Umicore Korea, Ltd.

Shinichi Komaba

Atsushi Ito

Naoaki Yabuuchi

Kei Kubota

Kuniaki Okamoto

Tsuneaki Maesawa

Takeo Sasaki

Shota Hashimoto

Zhen-ji Han

Naoki Fujiwara

Toru Ishikawa

Jens M Paulsen

Yasuhiko Ohsawa

Tatsuya Hasegawa

Daisuke Endo

Yoshio Kajiya

Shinichi Kumakura

Yuta Matsuura

Takahiro Kiyosu

Junji Fujioka

Satoru Kuze

Yasuyoshi Mori

Takatoshi Matsuura

Kyomi Tajima

Shoko Aoki

Mitsue Takeuchi

Tomoaki Ozeki

Wataru Murata

Kiyofumi Yamagiwa

Junichi Iwatate

Kuniko Chihara

Michihiko Sato

Akihiro Katogi

Mouad Dahbi

Tomooki Hosaka

Masaya Yano

Yoshiyuki Tahara

Ryo Hara

Masataka Kajiyama

Zhen-Ji Han

An electrolyte solution for a potassium ion battery or a potassium ion capacitor, the electrolyte solution comprising at least one potassium salt compound selected from the group consisting of potassium bis(trifluoromethanesulfonyl)amide and potassium bis(fluorosulfonyl)amide and at least one solvent selected from the group consisting of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, ethylene carbonate, and propylene carbonate, in which a concentration of the potassium salt compound in the electrolyte solution is from 1.5 mol/kg to 12.0 mol/kg.

Electrolyte solution for potassium ion battery, potassium ion battery, electrolyte solution for potassium ion capacitor, and potassium ion capacitor

Provided is the positive electrode active material for a potassium ion battery according to the embodiment comprises a compound represented by Formula (1), in which M represents at least one element selected from the group consisting of V, Fe, Co, Ni, and Mn, and x represents a number from 0 to 1; and is a positive electrode for a potassium ion battery comprising the positive electrode active material for a potassium ion battery according to the embodiment, or a potassium ion battery comprising the positive electrode for a potassium ion battery.KMOPOF&#x2003;&#x2003;[Formula (1)].

Positive electrode active material for potassium ion battery, positive electrode for potassium ion battery, and potassium ion battery

It is an object of the present invention to provide an electrode capable of maintaining superior capacity retention without destruction of an electrode structure, even in the case of using an active material including silicon. The present invention relates to 'a binder for a lithium cell, the binder comprising polyacrylic acid cross-linked by a cross-linking agent selected from the compounds described in the general formulae [1] to [13] and the polymer described in the general formula [14] (provided that the one which includes a functional group-containing vinylidene fluoride-based polymer is excluded)'; a 'composition for producing an electrode of a lithium cell, the composition comprising 1) an active material containing silicon, 2) a conductive assistant and 3) a cross-linked-type polyacrylic acid (provided that the one containing a functional group-containing vinylidene fluoride-based polymer is excluded)'; and an &#x201c;electrode for a lithium cell, the electrode comprising 1) an active material containing silicon, 2) a conductive assistant, 3) a cross-linked-type polyacrylic acid, and 4) a current collector (provided that the one containing a functional group-containing vinylidene fluoride-based polymer is excluded)&#x201d;.

Binder for lithium cell, composition for producing electrode, and electrode

It is an object of the present invention to provide an electrode having superior charge-discharge capacity, even in the case of using an active material containing silicon. The present invention relates to 'a binder for a lithium cell comprises a polymer having a monomer unit derived from acrylic acid, and 1 to 2 kinds of monomer units derived from the compound shown by the general formula (I), the general formula (II), or the general formula (III), as constituents, and cross-linked by a cross-linking agent selected from the compounds described by the following general formulae [1] to [13], and the polymer described by the following general formula [14]', 'a composition for producing an electrode of a lithium cell comprising 1) an active material containing silicon, 2) a conductive assistant, and 3) the above-described binder for a cell', and &#x201c;an electrode for a lithium cell having 1) an active material containing silicon, 2) a conductive assistant, 3) the above-described binder for a cell, and (4) a current collector&#x201d;.

Binder for lithium cell

Provided are: a potassium ion secondary battery which is not susceptible to deterioration of charge/discharge capacity even if charging and discharging are repeated, and which has a long service life as a secondary battery; a potassium ion capacitor; a negative electrode for the potassium ion secondary battery; and a negative electrode for the potassium ion capacitor. A negative electrode for potassium ion secondary batteries and a negative electrode for potassium ion capacitors, each of which contains a carbon material that is capable of absorbing and desorbing potassium and a binder that contains a polycarboxylic acid and/or a salt thereof. A potassium ion secondary battery which is provided with the negative electrode or the capacitor. A binder for negative electrodes of potassium ion secondary batteries or negative electrodes of potassium ion capacitors, which contains a polycarboxylic acid and/or a salt thereof.

Negative electrode for potassium ion secondary batteries, negative electrode for potassium ion capacitors, potassium ion secondary battery, potassium ion capacitor, and binder for negative electrodes of potassium ion secondary batteries or negative electrodes of potassium ion capacitors

A positive electrode-active material is provided for use in a positive electrode for a sodium secondary cell and a sodium secondary cell. Also provided is a positive electrode for a sodium secondary cell and a sodium secondary cell having a high energy density. The positive electrode-active material for a sodium secondary cell includes a composite metal oxide, which has an &#x3b1;-NaFeOtype crystal structure and is denoted by Formula (1) described below:Na(FeNiMnTi)O&#x2003;&#x2003;(1),wherein a is greater than or equal to 0.6 and less than or equal to 1.0, w is greater than 0 and less than 0.5, x is greater than 0 and less than 0.5, y is greater than 0.03 and less than or equal to 0.5, z is greater than or equal to 0.03 and less than 0.5, and w+x+y=1.0, and y&#x3e;z.

Positive electrode-active substance for sodium secondary cell, positive electrode for sodium secondary cell, and sodium secondary cell

A sodium transition metal based cathode material for a rechargeable sodium battery, having a P2 orthorhombic layered bronze crystal structure with space group Cmcm, and having a composition NaMMnLiAOwith 0.60&#x3c;x&#x3c;0.95, wherein M consists of either one or more elements of the group consisting of Cu, Zn and Ni; A consisting of either one or more elements of the group consisting of Mg, Ti, Fe, Cr and Co, with 0&#x3c;y&#x3c;0.20, 0&#x2264;z&#x3c;0.2, 0&#x2264;y'&#x3c;0.33, and z+y&#x2032;&#x3e;0.

Bivalent metal doping for sodium manganese oxide as cathode materials for sodium ion batteries

A sodium transition metal cathode material for a rechargeable sodium battery having a P2 layered bronze crystal structure, comprising at least 55 mol % manganese, wherein the manganese valence state is at least 3.75. The material undergoes a structural transformation to a secondary cathode material by extraction of sodium during the 1charge of a rechargeable sodium battery comprising the sodium cathode material. The material has either a composition NaMOwhere M=MnLiAwhere z&#x3c;0.2 and y&#x3c;0.33 and 0.66&#x3c;x&#x3c;0.95, and wherein A consists of either one of more elements of the group Ti, Fe, Ni, Mg and Co, or a composition NaxMO2 where M=LiMnMgAwhere 0&#x3c;a&#x3c;0.2, c&#x3c;0.2 and 0.2&#x3c;a+b&#x3c;0.46 and 0.66&#x3c;x&#x3c;0.95, and wherein A consists of either one of more elements of the group Ti, Fe, Ni and Co.

Doped sodium manganese oxide cathode material for sodium ion batteries

Provided is a novel lithium complex oxide containing molybdenum. A complex oxide represented by the following compositional formula: LiMMoO wherein M is one or two or more selected from the group consisting of Mn, Ru, Sn, Mg, Al, Ti, V, Cr, Fe, Co, Ni, Cu, and Zn; x is in the range of 0.60 to 0.75; y is in the range of 0.15 to 0.25; and z is in the range of 0.075 to 0.20.

Lithium complex oxide

It is an object of the present invention to provide an electrode capable of maintaining superior capacity retention without destruction of an electrode structure, even in the case of using an active material including silicon. The present invention relates to 'a binder for a lithium cell, the binder comprising polyacrylic acid cross-liked by a cross-linking agent selected from the compounds described in the general formulae [1] to [13] and the polymer described in the general formula [14] (provided that the one which includes a functional group-containing vinylidene fluoride-based polymer is excluded)'; a 'composition for producing an electrode of a lithium cell, the composition comprising 1) an active material containing silicon, 2) a conductive assistant and 3) a cross-linked-type polyacrylic acid (provided that the one containing a functional group-containing vinylidene fluoride-based polymer is excluded)'; and an &#x201c;electrode for a lithium cell, the electrode comprising 1) an active material containing silicon, 2) a conductive assistant, 3) a cross-linked-type polyacrylic acid, and 4) a current collector (provided that the one containing a functional group-containing vinylidene fluoride-based polymer is excluded)&#x201d;.

An active material for a nonaqueous electrolyte energy storage device contains a lithium-transition metal composite oxide having a crystal structure attributable to space group Fm-3m and represented by the compositional formula (1):LiNbMeAO&#x2003;&#x2003;(1)wherein Me is a transition metal including Fe and/or Mn, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;0.5, 0.25&#x2266;z&#x3c;1, A is an element other than Nb and Me, and 0&#x2266;p&#x2266;0.2.

Active material for nonaqueous electrolyte energy storage device

Disclosed is a sodium-ion secondary battery having excellent charge and discharge efficiencies as well as excellent charge and discharge characteristics, wherein charging and discharging can be repeated without causing problems such as deterioration in battery performance. Specifically disclosed is a sodium ion secondary battery which is provided with a positive electrode, a negative electrode having a negative electrode active material, and a nonaqueous electrolyte solution containing a nonaqueous solvent. The nonaqueous solvent is substantially composed of a saturated cyclic carbonate (excluding the use of ethylene carbonate by itself), or a mixed solvent of a saturated cyclic carbonate and a chain carbonate, and a hard carbon is used as the negative electrode active material. It is preferable that the nonaqueous solvent used for the sodium-ion secondary battery is substantially composed of propylene carbonate, a mixed solvent of ethylene carbonate and diethyl carbonate, or a mixed solvent of ethylene carbonate and propylene carbonate.

Sodium ion secondary battery

An additive for a sodium ion secondary battery of the present invention includes a compound of at least one of a saturated cyclic carbonate having a fluoro group and a chain carbonate having a fluoro group. A sodium ion secondary battery () of the present invention includes: a non-aqueous electrolytic solution including the additive for a sodium ion secondary battery and a non-aqueous solvent containing a saturated cyclic carbonate or a non-aqueous solvent containing a saturated cyclic carbonate and a chain carbonate; a positive electrode (); and a negative electrode () that includes a coating formed in a surface of the negative electrode, the coating containing a composite material having carbon, oxygen, fluorine and sodium in the surface and includes a negative-electrode active material containing a hard carbon.

Additive for sodium ion secondary battery and sodium ion secondary battery

There are provided a battery electrode wherein an active material layer is formed on a collector surface, and the layer contains an active material and a block copolymer having a vinyl alcohol polymer block; and a lithium ion secondary battery having a laminate structure in which a pair of electrodes having an active material layer are disposed in such a manner that the active material layers face each other via a separator, and an electrolyte composition containing a lithium-containing electrolyte salt fills the gaps between the pair of electrodes and the separator, wherein at least one of the pair of electrodes is the above battery electrode. Thus, there can be provided a lithium ion secondary battery which can be easily produced and be less polarized, exhibiting excellent charge/discharge properties and cycle characteristics.

Battery electrode and lithium ion secondary battery provided with same

Provided are: a composite metal oxide with which it is possible to improve the performance of a sodium secondary battery; a process for producing the composite metal oxide; a positive active material which comprises the composite metal oxide; a positive electrode produced using the positive active material; and a sodium secondary battery including the positive electrode. The composite metal oxide is represented by the following formula: NaFeMnO. The composite metal oxide is constituted of an oxide having a P2 structure and a lamellar oxide, with some extent of stacking faults, having an octahedral structure and/or a triangular-prism structure. The lamellar oxide preferably is an oxide having an O3 structure.

Composite metal oxide, process for producing the composite metal oxide, positive active material for sodium secondary battery, positive electrode for sodium secondary battery, and sodium secondary battery

Growing community of inventors

Tokyo, Japan

Shinichi Komaba