Sony Corporation

Murata Manufacturing Co., Ltd.

Kobe University

Izaya Okae

Shinya Wakita

Masayuki Ihara

Tadahiko Kubota

Kazumasa Takeshi

Masanori Soma

Saori Tokuoka

Atsuo Omaru

Hiroyuki Yamaguchi

Eishi Endo

Yoshiaki Takeuchi

Yusuke Morino

Yosuke Ushio

Nobuhiro Inoue

Minoru Mizuhata

A method and a device are provided for measuring a zeta potential with reproducibility, high reliability and high accuracy, by predicting an equilibrium value from the change over time of a streaming potential. In measurement of the zeta potential of a sample surface using a streaming potential method, an external pressure is changed in a step-wise manner, and a pressure change profile is set having a rising part or a falling part which is of a shorter time than the relaxation time T required for response to a change in the streaming potential accompanying the change in external pressure, and a steady part in which pressure is held at a steady state for a time longer than the relaxation time T. An asymptotic value of the streaming potential extrapolated from the transient response of the streaming potential occurring from the pressure change profile is used to calculate the zeta potential.

Zeta potential measurement method and measurement device

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution where (A) the electrolytic solution contains a solvent and an electrolyte salt, the solvent containing ethylene carbonate, (B) a content of the electrolyte salt is from 0.8 mol/kg to 2.0 mol/kg both inclusive, (C) a content of the ethylene carbonate in the solvent is from 10 wt % to 30 wt % both inclusive, (D) a ratio M2/M1 of a number M2 of moles of the ethylene carbonate to a number M1 of moles of the electrolyte salt is from 0.4 to 2.4 both inclusive, and (E) the electrolytic solution contains at least one of sulfone compounds.

Electrolyte for secondary battery, secondary battery, battery pack, electric vehicle, electric power storage system, electric tool and electronic device

The secondary battery includes an electrolyte layer including an electrolytic solution and a polymer compound, a positive electrode, and a negative electrode. The polymer compound includes one or both of a first polymer compound and a second polymer compound. The first polymer compound further includes a first homopolymer and one or both of a second homopolymer and a second copolymer. The second polymer compound further includes a third copolymer and one or both of a fourth homopolymer and a fourth copolymer.

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

A battery includes a positive electrode, a negative electrode, and an electrolyte. At least one of the positive electrode and the negative electrode is an electrode containing an active material and an inorganic oxide. The inorganic oxide is in a state of being extractable with tetrahydrofuran or methyl ethyl ketone at normal temperature.

Electrode and battery

A nonaqueous electrolyte secondary battery includes a positive electrode having a positive electrode active material layer provided on a positive electrode collector, a negative electrode having a negative electrode active material layer provided on a negative electrode collector, and a nonaqueous electrolyte. The nonaqueous electrolyte contains at least one member selected from the group consisting of sulfone compounds represented by the following formulae (1) and (2); and an inorganic phosphorus compound represented by the following formula (3) exists on the surface of a positive electrode active material: R1 represents CHX; X represents a halogen; m represents an integer of from 2 to 7; each of nand nindependently represents an integer of from 0 to 2m; R2 represents CHZ; Z represents a halogen; j represents an integer of from 2 to 7; each of kand kindependently represents an integer of from 0 to 2j; each of R3, R4 and R5 independently represents H or OH; and a is 0 or 1.

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery includes a positive electrode having a positive electrode active material layer provided on a positive electrode collector, a negative electrode having a negative electrode active material layer provided on a negative electrode collector, and a nonaqueous electrolyte. The nonaqueous electrolyte contains at least one member selected from the group consisting of sulfone compounds represented by the following formulae (1) and (2); and an inorganic phosphorus compound represented by the following formula (3) exists on the surface of a positive electrode active material: Rrepresents CHX; X represents a halogen; m represents an integer of from 2 to 7; each of n1 and n2 independently represents an integer of from 0 to 2m; R2 represents CHZ; Z represents a halogen; j represents an integer of from 2 to 7; each of k1 and k2 independently represents an integer of from 0 to 2j; each of R3, R4 and R5 independently represents H or OH; and a is 0 or 1.

A secondary battery includes a cathode, an anode, and an electrolytic solution. The anode has an anode active material layer containing a carbon material and a lithium-containing compound (LiMN) as an anode active material, where M is one or more transition metal elements. a is a numerical value satisfying 0&#x3c;a&#x2266;0.8. The average particle diameter of the lithium-containing compound is 1 &#x3bc;m or less.

Anode and secondary battery

An anode and battery including the anode capable of improving the cycle characteristics while securing the input and output characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The anode includes an anode active material layer on an anode current collector, wherein the anode active material layer includes an anode active material capable of intercalating and deintercalating an electrode reactant, wherein a thickness of the anode active material layer ranges from 60 &#x3bc;m to 120 &#x3bc;m, and wherein the anode active material includes a carbon material and at least part of a surface is covered by a covering, the covering including at least one of an alkali metal salt and an alkali earth metal salt.

Anode and battery

A nonaqueous electrolyte secondary battery includes: a positive electrode; a negative electrode; and a nonaqueous electrolyte, wherein the positive electrode contains a positive electrode active material having an olivine structure, and the nonaqueous electrolyte contains at least one member of sulfone compounds represented by the following formulae (1) and (2). wherein R1 represents CHX; X represents a halogen; m represents an integer of from 2 to 7; each of n1 and n2 independently represents an integer of from 0 to 2m; R2 represents CHZ; Z represents a halogen; j represents an integer of from 2 to 7; and each of k1 and k2 independently represents an integer of from 0 to 2j.

A secondary battery capable of providing a high energy density and superior cycle characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. The anode has an anode active material layer containing a carbon material and a lithium-containing compound (LiMN) as an anode active material. M is one or more transition metal elements. a is a numerical value satisfying 0&#x3c;a&#x2266;0.8. The average particle diameter of the lithium-containing compound is 1 &#x3bc;m or less

A non-aqueous electrolyte battery includes a positive electrode having a positive electrode active material layer provided on a positive electrode collector, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode active material layer contains a polyvinylidene fluoride-containing binder and a nano ceramic particle having a primary particle size of not more than 100 nm; and the binder and the nano ceramic particle are complexed.

Non-aqueous electrolyte battery and positive electrode, and method for manufacturing the same

A battery capable of improving the cycle characteristics while securing the input and output characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The anode has an anode active material layer on an anode current collector. The anode active material layer contains an anode material having a plurality of covering particles on a surface of an anode active material capable of intercalating and deintercalating an electrode reactant. The plurality of covering particles contain at least one of an alkali metal salt and an alkali earth metal salt.

Anode material, anode and battery, and methods of manufacturing them

A battery including a positive electrode, a negative electrode and an electrolytic solution, wherein the negative electrode has a negative electrode active material layer containing a carbon material and a binder and having a thickness per one face of 70 &#x3bc;m or more and not more than 120 &#x3bc;m; and the binder contains a copolymer A which is obtained by copolymerizing 100 parts by weight of polyvinylidene fluoride (PVDF) and from 0 to 4 parts by weight of hexafluoropropylene (HFP) and a copolymer B which is obtained by copolymerizing 100 parts by weight of polyvinylidene fluoride and from 5 to 12 parts by weight of hexafluoropropylene in a mass content ratio of A/B of from 60/40 to 90/10.

Battery

A battery capable of obtaining a high energy density and obtaining superior cycle characteristics is provided. A spirally wound electrode bodyhaving a lamination structure composed of a cathode, an anode, and a separatoris contained in a battery can. In the cathode, a cathode active material layerB containing an ambient temperature molten salt and a cathode active material is provided on a cathode current collectorA. The content ratio of the ambient temperature molten salt in the cathode active material layerB is in the range from 0.1 mass % to 5 mass %. The ambient temperature molten salt is, for example, a tertiary or quaternary ammonium salt that is composed of a tertiary or quaternary ammonium cation and an anion having a fluorine atom.

Electrode and method of fabricating it, and battery

A battery capable of obtaining the high energy density and obtaining the superior cycle characteristics is provided. In an anode, the thickness of a single face of an anode active material layer containing a carbon material as an anode active material is from 75 &#x3bc;m to 120 &#x3bc;m. An electrolytic solution contains difluoroethylene carbonate as a solvent. Thereby, the energy density of the anode is improved, and the diffusion and the acceptance of lithium ions in the anode are improved.

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Fukushima, Japan

Izaya Okae