Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Primearth Ev Energy Co., Ltd.

Katsumi Kashiwagi

Kazuyoshi Honda

Masaya Ugaji

Taisuke Yamamoto

Tatsuki Hiraoka

Shuji Ito

Toshitada Sato

Yasutaka Kogetsu

Masanori Sumihara

Daisuke Suetsugu

Kaoru Inoue

Masaki Hasegawa

Kohei Suzuki

Takayuki Shirane

Hiroyuki Sakamoto

Masao Fukunaga

Shinichiro Ito

Akira Kuroda

Kunihiko Bessho

Kunihiko Mineya

Yuki Suehiro

Yuki Sakito

Nobuyuki Kirihara

Yasuhiro Inadomi

Provided is a negative electrode for a non-aqueous electrolyte secondary battery, capable of improving the energy density and the cycle characteristics of the battery without lowering the initial charge/discharge efficiency of the battery. This negative electrode includes a negative electrode active material including a silicon oxide represented by SiOand carbon material. A proportion of a mass of the silicon oxide relative to a total mass of the silicon oxide and the carbon material: y satisfies 0.03&#x2264;y&#x2264;0.3. A difference between a theoretical capacity density of the negative electrode active material and a charge capacity density of the negative electrode active material when a cutoff voltage is 5 mV relative to lithium metal: &#x394;C (mAhg) satisfies L=&#x394;C/100 and 6y&#x2264;L&#x2264;12y+0.2.

Negative electrode for nonaqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery using the same

A nickel-hydrogen storage battery includes a positive electrode, a negative electrode using an ABbased hydrogen-absorbing alloy, and a separator arranged between the positive and negative electrodes. The ABbased hydrogen-absorbing alloy includes an A element, which is a constituent element of a misch metal, and a B element, which includes nickel and cobalt. The ratio of the amount of substance of the B element to that of the A element is 5.2 or more and 5.4 or less. The ratio of the amount of substance of cobalt to that of the A element is 0.15 or more and 0.4 or less. The liquid retention volume (V) and the true volume (V) of the separator, the theoretical capacity of the negative electrode (C), and the theoretical capacity of the positive electrode (C) satisfy the following expression.2.0&#x2266;1/2&#xd7;1/2&#x2266;3.1

Nickel-hydrogen storage battery

Disclosed is a lithium ion secondary battery including: a positive electrode including a positive electrode active material layer comprising a positive electrode active material capable of absorbing and releasing lithium ions, and a positive electrode current collector; a negative electrode including a negative electrode active material layer comprising an alloy-formable active material, and a negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte. The positive electrode active material layer has an easily swellable resin having a degree of swelling with the non-aqueous electrolyte of 20% or more, and the negative electrode active material layer has a hardly swellable resin having a degree of swelling with the non-aqueous electrolyte of less than 20%.

Lithium ion secondary battery

An electrode assembly () is formed by combining a positive electrode plate (), a separator (), and a negative electrode plate (), and the electrode assembly () was wound. An insulating member () having a hollow portion () is placed on the positive electrode plate (), the negative electrode plate (), or the separator () before the end of the winding step so that the insulating member () is incorporated inside the outermost of the electrode assembly () and into a corner portion () of the electrode assembly () in the winding direction. After a winding end portion () of the electrode assembly () is fixed, the hollow portion () is broken. Thereby, a space () resulting from the hollow portion () is formed inside the outermost of the electrode assembly ().

Lithium ion secondary battery with insulating member having a broken hollow portion and method for producing the same

In a charging method for a non-aqueous electrolyte secondary battery which includes a positive electrode including a lithium-containing composite oxide as an active material, a negative electrode including an alloy-formable negative electrode active material, and a non-aqueous electrolyte, a voltage of the secondary battery is detected. When the detected value is smaller than a predetermined voltage x, charging is performed at a comparatively small current value B. When the detected value is equal to or greater than the predetermined voltage x and smaller than a predetermined voltage z, charging is performed at a comparatively great current value A. When the detected value is equal to or greater than the predetermined voltage z and smaller than a predetermined voltage y, charging is performed at a comparatively small current value C. When the detected value is greater than the predetermined voltage y, constant-voltage charging is performed or charging is terminated. Here, x&#x3c;z&#x3c;y.

Charging method and charger for non-aqueous electrolyte secondary battery

A lithium ion secondary battery including: a positive electrode current collector; a positive electrode active material layer that is provided in contact with the positive electrode current collector; a separator layer that is provided on a side of the positive electrode active material layer on which the positive electrode current collector is not provided; a negative electrode active material layer that is provided on a side of the separator layer on which the positive electrode active material layer is not provided, that primarily contains silicon or tin, and that includes a opposing portion opposing the positive electrode active material layer and a non-opposing portion not opposing the positive electrode active material layer, the opposing portion and the non-opposing portion containing lithium produced by a thin film-forming method; and a negative electrode current collector that is provided on a side of the negative electrode active material layer on which the separator layer is not provided. Thereby, deformation of the negative electrode and deterioration in cycle characteristics accompanied by such deformation can be prevented.

This invention provides a negative electrode and a non-aqueous electrolyte secondary battery including the negative electrode. The negative electrode includes a Li-absorbing element as a negative electrode active material, is free from deformation, separation of the negative electrode active material layer from the negative electrode current collector, and deposition of lithium on the negative electrode current collector, and is excellent in cycle characteristic, large-current discharge characteristic, and low-temperature discharge characteristic. The negative electrode of this invention includes: a current collector having depressions and protrusions on a surface in the thickness direction thereof; and a negative electrode active material layer that includes a plurality of columns containing a negative electrode active material that absorbs and releases lithium ions, the columns being grown outwardly from the surface of the current collector. The negative electrode of this invention is characterized in that the columns are grown at an inclination angle relative to the direction perpendicular to the surface of the current collector, and that the inclination angle of the columns changes reversibly depending on absorption and release of lithium ions by the negative electrode active material.

Negative electrode for non-aqueous electrolyte secondary battery, method for producing the same, and non-aqueous electrolyte secondary battery

An active material of silicon, tin or a compound containing silicon or tin is formed on a current collector of a negative electrode in form of a plurality of island regions so that the island regions are separated from one another. Furthermore, a conductive protective film is formed on the current collector so as to cover the island regions. The conductive protective film is formed so as to also cover exposed regions (space portions) of the current collector on which the island regions are not formed. Thus, expansion/shrink of the active region following charge/discharge can be absorbed by the conductive protective film formed in the space portions between the island regions. Also, adhesiveness of the active material with the current collector can be improved.

Lithium ion secondary battery and method for forming negative electrode plate for lithium ion secondary battery

A method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery includes the following three steps of:

Nonaqueous electrolyte secondary battery and method of manufacturing negative electrode thereof

A negative electrode for non-aqueous electrolyte secondary batteries has a mixture layer disposed on a current collector. The mixture layer includes a composite negative electrode active material, a first binder containing an acryl-group-containing polymer, and a second binder containing adhesive rubber particles. The composite negative electrode active material contains carbon nanofibers, a catalyst element, and silicon-containing particles capable of charging and discharging at least lithium ions. The first binder binds the silicon-containing particles to the current collector, and the second binder binds the carbon nanofibers together.

Negative electrode for non-aqueous electrolyte secondary batteries, and non-aqueous electrolyte secondary battery having the same

An electrode capable of effectively dispersing or relieving the stress generated in association with expansion and contraction of an active material is provided. The electrode is produced by forming an active material layer on a predetermined current collector. This current collector includes a base and a plurality of projections formed so as to extend outwardly from a surface of the base. The cross section of the projections in a thickness direction of the current collector has a tapered shape in which a width in a direction parallel to the surface of the base narrows from the surface of the base along an extending direction of the projections.

Current collector, electrode, and non-aqueous electrolyte secondary battery

A method for manufacturing a positive electrode plate for a non-aqueous secondary battery including: preparing an active material A, a conductive material B, a binder C, a thickener D, and a liquid component E, the thickener D being in a powder state, the conductive material B including a carbon material, the thickener D including a water-soluble polymer, and the liquid component E including water; preparing a slurry including the component E and an electrode material mixture, the material mixture including the active material A, the conductive material B, the binder C, and the thickener D; and applying the slurry on a current collector. In preparing the slurry, the thickener D in a powder state, the active material A and the conductive material B are kneaded together with the liquid component E, and then the primary kneaded matter, the binder C, and an additional liquid component are kneaded.

Growing community of inventors

Nara, Japan

Katsumi Kashiwagi