Jm Energy Corporation

Takashi Chiba

Naoshi Yasuda

Makoto Taguchi

Nobuo Ando

Kenji Nansaka

Yuu Watanabe

Kenji Kojima

Teruaki Tezuka

Kazuyoshi Okada

Kuniyasu Hiraiwa

Hirobumi Suzuki

An electrical storage device includes a casing that has an opening, an electrode assembly that is placed inside the casing, a terminal plate that is electrically connected to the electrode assembly, and a holder that is provided to surround the terminal plate, the terminal plate having a step or a slope in an area in which the terminal plate comes in contact with the holder.

Electricity storage device and electricity storage module

Provided is a lithium ion capacitor that can maintain a high capacity retention rate and suppress an increase in internal resistance even after high-load charging-discharging is repeated many times and that has long service life because the occurrence of a short circuit due to precipitation of lithium on the negative electrode is prevented. The lithium ion capacitor comprises a positive electrode, a negative electrode, and an electrolyte solution, the negative electrode including a current collector and electrode layers that contain a negative electrode active material and are formed on front and back surfaces of the current collector, wherein, in the negative electrode, ratios of deviations of respective thicknesses of the electrode layers formed on the front and back surfaces of the current collector from an average of the thicknesses of the electrode layers to the average is &#x2212;10 to 10%.

Lithium ion capacitor

An accumulator device which provides a high energy density and high output power is provided. The accumulator device (D) includes a positive electrode in which a positive electrode layer (A) is formed, a negative electrode in which a negative electrode layer (B) is formed, and an electrolytic solution (C). The accumulator device is characterized by satisfying that 1.02&#x2266;W/W&#x2266;2.08 and that 390 &#x3bc;m&#x2266;T&#x2266;750 &#x3bc;m, where Wis the weight of the positive electrode layer (A), Wis the weight of the negative electrode layer (B), and Tis the thickness of the positive electrode in which the positive electrode layer (A) is formed.

Accumulator device

Growing community of inventors

Nirasaki, Japan

Takashi Chiba