Sanyo Electric Co., Ltd.

Panasonic Energy Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Holdings Corporation

Atsushi Mizawa

Kei Kobayashi

Takaki Nakao

Junichi Sugaya

Masahiro Nakamura

Tomomichi Ueda

Yoshinori Kida

Yoshiyuki Muraoka

Fumiharu Niina

Hiroyuki Fujimoto

Tasuku Ishiguro

Daisuke Nishide

Yuji Yamagami

Syunsuke Natsumeda

Mitsunori Miyanari

Yosuke Imanishi

A nonaqueous electrolyte secondary battery includes a roll-type electrode group including positive and negative electrode plates and a tape attached to the outermost circumferential surface of the electrode group. The tape has two adhesion regions including an adhesive layer and a non-adhesion region that is interposed between the two adhesion regions and is composed of a base material layer only. The non-adhesion region straddles the rolling-end edge of at least one of the positive or negative electrode active material layer on the roll inner side of the positive or negative electrode collector and the positive or negative electrode active material layer on the roll outer side of the positive or negative electrode collector in the positive or negative electrode plate when the electrode group is viewed from a roll center axis toward the outside of the roll.

Non-aqueous electrolyte secondary battery

The present disclosure aims to suppress, in a winding type electrode body in which a negative electrode lead is bonded to a winding start side end of a negative electrode collector, electrode plate deformation in association with charge/discharge cycles. A nonaqueous electrolyte secondary battery according to one aspect of the present disclosure includes a winding type electrode body (). A negative electrode () includes a negative electrode lead () bonded to a winding start side end of a negative electrode collector and is wound at least one turn from a winding-direction inner end so as not to face a positive electrode () with a separator () interposed therebetween. The negative electrode () includes an insulating tape () adhered to the negative electrode collector so as to straddle a surface of the negative electrode lead () in a winding direction.

Nonaqueous electrolyte secondary battery

The present disclosure aims to provide a nonaqueous electrolyte secondary battery in which electrode plate deformation in association with charge/discharge cycles is suppressed. A nonaqueous electrolyte secondary battery which is one example of an embodiment of the present disclosure includes a winding type electrode body (). The electrode body () is provided with a tape () adhered to an exposed portion () which is provided at an outermost circumferential surface and at which a negative electrode collector is exposed. The tape () is adhered to the exposed portion () so as not to be overlapped with at least one of a winding-finish side end () of positive electrode mixture layers and a winding-finish side end () of negative electrode mixture layers in a radius direction of the electrode body ().

A nonaqueous electrolyte secondary battery using a silicon compound as a negative electrode active material, suppress deformation of a negative electrode. An embodiment includes a winding type electrode body in which a positive electrode and a negative electrode are spirally wound with at least one separator interposed therebetween. In a negative electrode mixture layer, a silicon compound is contained as a negative electrode active material. A winding-start side end of the negative electrode mixture layer extends to a winding-start end side of the electrode body past a winding-start side end of a positive electrode mixture layer. A length Y (mm) of a portion of the negative electrode mixture layer extending from the winding-start side end of the positive electrode mixture layer and a rate X (percent by mass) of the silicon compound with respect to the total mass of the negative electrode active material satisfy a relationship of Y&#x2265;3X&#x2212;15 (6&#x2264;X&#x2264;15).

The purpose of the present disclosure is to prevent, in a nonaqueous electrolyte secondary battery, a tape adhered to an outermost peripheral surface of an electrode group from breaking due to charging and discharging. A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure includes a winding-type electrode group and tapes adhered to an outermost peripheral surface of the electrode group so that an electrode group winding end E is fixed to the outermost peripheral surface of the electrode group. The tapes include: two adhesive regions including a substrate layer and an adhesive layer; and a non-adhesive region sandwiched between the two adhesive regions and consisting only of the substrate layer. The non-adhesive region is disposed so as to extend across the winding end E, which is positioned on the outermost periphery of the electrode group, in the winding direction.

A nonaqueous electrolyte secondary battery includes a negative electrode plate, a negative electrode current collector lead joined to the inner peripheral end of the negative electrode plate, and a negative electrode current collector-exposed part where a negative electrode active material layer is not formed at the outer peripheral-side end. The negative electrode current collector-exposed part at the outer peripheral end comes in contact with a battery case, and in a plane vertical to the axis of an electrode body, a line connecting the axis and the center of a positive electrode current collector lead does not coincide with a line connecting the axis and the center between the coating end of the outer peripheral-side negative electrode active material layer of the negative electrode plate and the terminal part of the outer peripheral-side positive electrode plate.

This nonaqueous electrolyte secondary battery includes a winding-type electrode group which comprises a positive electrode plate and a negative electrode plate, and tape adhered on the peripheral surface of the electrode group. A current collector of the negative electrode plate is exposed in at least part of the outermost peripheral surface of the electrode group in the winding direction, and the current collector contacts a case body. The tape comprises a base material layer and an adhesive layer arranged continuously in the winding direction on the inner surface of the wound base material layer. Dividing the region seen from the wound inner surface of the tape into first regions configured from the base material layer and second regions configured from the base material layer and the adhesive layer, the first regions are interposed between second regions in at least part of the area of the tape in the winding direction.

A battery including an electrode group with a positive electrode plate and a negative electrode plate, and tape. A current collector of the negative electrode plate is exposed in at least part of the outermost peripheral surface of the electrode group in the winding direction, and the current collector contacts a case body. The tape comprises a base material layer and an adhesive layer arranged continuously in the winding direction on the inner surface of the wound base material layer. Dividing the region of the tape, seen from the wound inner surface, into first regions configured from the base material layer and second regions configured from the base material layer and the adhesive layer, in the winding axial direction of the electrode group, the first regions are arranged adjacent to a second region in at least the center end of the electrode group on the both ends of the tape.

A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes: a wound electrode assembly () formed by spirally winding, via a separator (), a positive electrode () and a negative electrode () in which a negative electrode mixture layer is formed on a negative electrode core, where: the negative electrode () includes a non-opposing portion () that is wound 1.25 turns or more from an inner edge in a winding direction of the wound electrode assembly () without facing the positive electrode via the separator (); the non-opposing portion () includes a negative electrode mixture layer-formed portion () in which the negative electrode mixture layer is formed on at least either side continuously in an inward winding direction from an outer edge in the winding direction; and the negative electrode mixture layer-formed portion () is wound 0.75 turns or more.

Cylindrical nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery of the invention includes a positive electrode, a negative electrode and a nonaqueous electrolyte, the positive electrode including lithium transition metal oxide particles as a positive electrode active material, the lithium transition metal oxide particles containing nickel as a main transition metal component and being such that a first compound containing at least one element Ma selected from the group consisting of Group IV elements and Group V elements is sintered to a portion of the surface of the lithium transition metal oxide particles, the first compound having a composition different from that of the lithium transition metal oxide particles, the positive electrode further including a second compound containing at least one element Mb selected from the group consisting of Group VI elements, the second compound having a composition different from that of the lithium transition metal oxide particles.

Nonaqueous electrolyte secondary battery and positive electrode active material for nonaqueous electrolyte secondary batteries

A nonaqueous electrolyte secondary battery attains both a high capacity and excellent low-temperature characteristics. A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator, a nonaqueous electrolyte and a battery case accommodating the battery constituents, the positive electrode having a positive electrode mixture layer including a lithium transition metal oxide and a conductive auxiliary, the lithium transition metal oxide containing at least Ni. The percentage of Ni in the total moles of metal element(s) except lithium present in the oxide is not less than 88 mol %, the content of the conductive auxiliary being not less than 0.75 parts by mass and not more than 1.25 parts by mass, the ratio of the lithium transition metal oxide being not less than 25 parts by volume in the inside of the battery case.

Nonaqueous electrolyte secondary batteries

Provided is a non-aqueous electrolyte secondary battery having a high capacity and an improved cycle life. The battery includes an electrode group and a non-aqueous electrolyte, and has a volume energy density of 650 Wh/L or more. The electrode group includes wound positive and negative electrodes with a separator interposed therebetween. The positive and negative electrodes each include a current collector and a material mixture layer adhering thereto. The positive and negative electrode material mixture layers each have a porosity Pof 22% or less and porosity Pof 25% or less. The ratio V/Vof a volume Vof the electrolyte to a total Vof the pore volumes of the positive and negative electrode material mixture layers, and the separator is 1 to 1.5. The difference between contact angles CAand CAof the positive and negative electrodes with respect to the non-aqueous electrolyte is 23&#xb0; or less.

Growing community of inventors

Hyogo, Japan

Atsushi Mizawa