Sony Corporation

Murata Manufacturing Co., Ltd.

Shinji Hatake

Akira Yamaguchi

Atsuo Omaru

Masayuki Nagamine

Yuzuru Fukushima

Takeshi Meguro

Hiroyuki Suzuki

Takaaki Matsui

Yuta Hirano

Taichi Kogure

Kazuki Honda

Naoko Yamakawa

Keitaro Kitada

Yoshihiro Dokko

Tadashi Miebori

Futoshi Sato

Noriaki Kokubu

Takashi Sato

Hiroshi Inoue

Masayuki Ihara

Masayuki Iwama

Taichi Katsumoto

Masahiro Miyamoto

Yoshikatsu Yamamoto

Moriaki Okuno

Satoshi Mizutani

Yoshifumi Shimizu

Masanori Anzai

Fumiko Hashimoto

Tsutomu Suehiro

Aya Mashiko

Takamitsu Saito

Takuma Kawahara

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer including a lithium-cobalt composite oxide. The lithium-cobalt composite oxide has a layered rock-salt crystal structure. The negative electrode includes a negative electrode active material layer including graphite. When the secondary battery is charged and discharged with an upper limit of a closed circuit voltage being set to 4.42 V or higher, a unit capacity (mAh/g) satisfies a condition represented by 168 mAh/g≤unit capacity (mAh/g)≤(−0.28×area rate (%)+178) mAh/g.

Secondary battery

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a lithium-cobalt composite oxide having a layered rock-salt crystal structure. The negative electrode includes graphite. An open circuit potential of the negative electrode measured in a full charge state is from 19 mV to 86 mV. A potential variation of the negative electrode is greater than or equal to 1 mV when the secondary battery is discharged from the full charge state by a capacity corresponding to 1% of a maximum discharge capacity. The maximum discharge capacity is obtained when the secondary battery is discharged with a constant current from the full charge state until the closed circuit voltage reaches 3.00 V, following which the secondary battery is discharged with a constant voltage of the closed circuit voltage of 3.00 V for 24 hours.

A secondary battery includes a cathode, an anode, and a nonaqueous electrolytic solution. The anode contains a carbon material and silicon oxide, and a weight ratio (%) of the silicon oxide with respect to a total of the carbon material and the silicon oxide is within a range of 0.01% to 20% both inclusive. The nonaqueous electrolytic solution contains an unsaturated cyclic carbonate ester.

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

A battery includes: a battery element having a cathode and an anode; a package can containing the battery element and being electrically connected to one of the cathode and the anode; and external connection terminal being connected to the other one of the cathode and the anode; and having a plate-like base contained in the package can and a leading portion extending to outside of the package can; and an insulating member separating the external connection terminal from the battery element. The base of the external connection terminal is spaced from an internal wall face of the package can, and the insulating member has notches at a position where the base of the external connection terminal is layered on the insulating member in the thickness direction of the package can.

Battery with secure short-circuiting mechanism

A battery with improved safety that can more surely short-circuit electrodes when flattened out by the external force is provided. A center pin () is inserted in the center of a spirally wound electrode body formed by layering and spirally winding a cathode and an anode with a separator in between. The center pin () has a cut line () provided in the longitudinal direction and a first cutout () vertically crossing the cut line (). When flattened out by the external force, a corner () at an intersection of the cut line () and the first cutout () is projected, and short-circuit is surely generated. Further, it is preferable that the center pin () has a second cutout () in the direction perpendicular to the cut line () in a position facing the cut line () in the circumferential direction. It is also preferable that the center pin () has a cross sectional shape of an oval or an ellipse, and the cut line () is provided in a position where the diameter of the oval or the ellipse is the largest.

Battery and center pin

A battery with improved safety which can establish a short circuit between electrodes more reliably when the battery is crushed by an external force is provided. A battery includes a battery element including a cathode and an anode, a battery can containing the battery element, and a conductive short circuit member arranged in a gap between the battery element and the battery can, the short circuit member capable of biting into the battery element when the battery can is deformed.

Battery

A battery capable of improving the energy density and cycle characteristics is provided. A cathode active material layer contains a complex oxide containing Li and Co as a cathode active material. An anode active material layer contains a CoSnC containing material containing Sn, Co, and C as an element, in which the content of C is from 16.8 wt % to 24.8 wt %, and the ratio of Co to the total of Sn and Co is from 30 wt % to 45 wt % as an anode active material. The surface density ratio of the cathode active material layer to the anode active material layer (surface density of the cathode active material layer/surface density of the anode active material layer) is from 2.77 to 3.90.

A nonaqueous electrolyte secondary battery is provided with a positive electrode including a positive-electrode active material, a negative electrode including a negative-electrode active material, and a nonaqueous electrolyte solution. The negative electrode further includes carbon fibers and carbon flakes. The synergistic effects of the improved retention of the electrolyte solution by the carbon fibers and the improved conductivity between the active material particles by the carbon flakes facilitate doping/undoping of lithium in a high-load current mode and increase the capacity of the battery in the high-load current mode.

Non-aqueous electrolyte secondary battery having a negative electrode containing carbon fibers and carbon flakes

The present invention relates to a nonaqueous electrolyte battery comprising: a cathode including a positive active material; an negative including a negative active material and a nonaqueous electrolyte, wherein assuming that the first charging capacity of the positive active material per gram is Cc [mAh/g], the weight of the positive active material is Cw [g], the first charging capacity of the negative active material per gram is Ac [mAh/g], the first discharging capacity is Ad [mAh/g] and the weight of the negative active material is Aw [g], the value of X [%] represented by a formula 16 is located within a range expressed by 20&#x2266;X&#x2266;50.  Thus, the deterioration of a capacity due to charging and discharging cycles is suppressed.

Nonaqueous electrolyte battery and method for manufacturing it, and positive active material, and method for producing it

Nonaqueous electrolyte secondary battery having a negative electrode containing carbon fibers and carbon flakes

Growing community of inventors

Fukushima, Japan

Shinji Hatake