Toyota Jidosha Kabushiki Kaisha

Toyota Motor Europe

Tomohide Sumi

Yoshio Matsuyama

Yosuke Shimura

Tomohiro Nakano

Koji Takahata

Hideki Sano

Takahiro Sakurai

Takashi Harayama

Yozo Uchida

Nobuyuki Yamazaki

Takumi Mio

Satoshi Goto

Tomohiko Ishida

A method of performing a formation process for a lithium-ion cell having an anode, a cathode, an electrolyte and a separator, the formation process including adding an additive to the electrolyte for improving a solid electrolyte interface build-up on the anode, performing a first charge of the cell at a first predetermined rate, performing a cycle of discharging/charging the cell at the first predetermined rate, repeating the cycle until a cycle maximum dQ/dV peak value is smaller than or equal to a predetermined dQ/dV value during charging of the cell and charging the cell to a fully charged capacity at a second predetermine rate, the second predetermined rate being greater than the first predetermined rate.

Lithium-ion battery formation process

Provided is a nonaqueous electrolyte secondary battery in which the following are housed in a battery case: a nonaqueous electrolyte, a boron atom-containing oxalato complex compound, and an electrode assembly in which a positive electrode having a positive electrode active material and a negative electrode having a negative electrode active material are disposed facing each other. Here, a coat containing boron atoms originating from the oxalato complex compound is formed on the surface of the negative electrode active material, and the amount B(&#x3bc;g/cm) of the boron atom as measured based on inductively coupled plasma-atomic emission spectroscopic analysis and the intensity Bfor a tricoordinate boron atom as measured based on x-ray absorption fine structure analysis satisfy 0.5&#x2264;B/B&#x2264;1.0.

Nonaqueous electrolyte secondary battery

An inspection method for a secondary battery according to the invention includes: a first aging treatment process for performing aging treatment on the secondary battery that has initially been charged at a first temperature; a first voltage measurement process; a second aging treatment process for performing the aging treatment on the secondary battery at a second temperature; a second voltage measurement process; a self-discharge amount computation process; a non-temperature dependent failure determination process for determining non-temperature dependent failure that does not depend on a relationship between a self-discharge amount and a temperature in accordance with the measured self-discharge amount; and a temperature dependent failure determination process for determining temperature dependent failure that depends on the relationship between the self-discharge amount and the temperature in accordance with the self-discharge amount, temperature dependency of which is suppressed.

Inspection method for secondary battery

An inspection method of a secondary battery according to the present invention includes: a charging step of charging an inspection target cell to a predetermined voltage set in advance; a voltage drop amount calculation step of calculating an amount of a voltage drop due to discharge by discharging the inspection target cell at a voltage of not more than the predetermined voltage; a non-defective product determination step of determining that the inspection target cell is a non-defective product, when the voltage drop amount is a threshold or less; and an aging step of performing aging after the non-defective product determination step.

Inspection method of secondary battery

An initial charging method for a lithium-ion battery according to this embodiment includes preparing a cell having a positive electrode, a negative electrode, and an electrolyte and charging the cell by using voltages based on the amount of change in a capacity of the cell per unit voltage as a specified voltage.

Initial charging method and production method for lithium-ion battery

A nonaqueous electrolyte battery provided by the present invention includes: an electrode body () having a flat shape and including a positive electrode and a negative electrode (); a square-shaped battery case () configured to accommodate therein the electrode body () and a nonaqueous electrolyte; and a negative electrode collector terminal () placed in the battery case () and connected to the negative electrode () of the electrode body (). The negative electrode collector terminal () is mainly made of copper or copper alloy. An insulator film () configured to insulate the battery case () from the electrode body () is placed between an inner wall () of the battery case () and the electrode body (). The insulator film () is joined to the inner wall () of the battery case (), and the insulator film () is placed so as not to make contact with the negative electrode collector terminal ().

Nonaqueous electrolyte battery and manufacturing method thereof

The method for manufacturing a lithium ion secondary battery includes a binder coating step (), a mixture supplying step (), a magnetic field applying step (), and a convection generating step (). The binder coating step () is a step of coating a slurry-form binder () on a metal foil () (collector). The mixture supplying step () is a step of supplying a negative electrode mixture containing graphite so as to be superposed on the slurry-form binder () coated on the metal foil () in the binder coating step (). The magnetic field applying step () is a step of applying a magnetic field having magnetic lines of force pointing in the direction orthogonal to the metal foil (), to the negative electrode mixture () coated on the metal foil () in the mixture supplying step (). Further, the convection generating step () is a step of generating convection in the negative electrode mixture () by applying heat to the negative electrode mixture () to which a magnetic field has been applied in the magnetic field applying step ().

Method for manufacturing lithium ion secondary battery

A method of manufacturing a secondary battery, using an electrode plate having an electrode mixture layer formed from an electrode mixture paste, includes performing wet preliminary kneading to knead a powder and a solvent with a stirrer, while measuring kneading torque, determining a mixing ratio of the powder to the solvent used in the wet preliminary kneading in the case where the kneading torque once increases as kneading time passes from start of kneading, reaches a peak value, and then decreases, as a desirable mixing ratio, and performing main kneading to mix and knead the powder and the solvent of the electrode mixture paste, at the mixing ratio determined as the desirable mixing ratio, at a shearing speed that does not exceed a speed of shearing a mixture of the powder and the solvent with the stirrer during the wet preliminary kneading, and producing the electrode mixture paste.

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Nagoya, Japan

Tomohide Sumi