Jm Energy Corporation

Teruaki Tezuka

Makoto Taguchi

Nobuo Ando

Yuu Watanabe

Toshihiro Hayashi

Naoshi Yasuda

Kenji Kojima

Takashi Chiba

Hirobumi Suzuki

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

Provided is a lithium ion capacitor having a low internal resistance, a high energy density, and a high capacity retention rate. The lithium ion capacitor includes a positive electrode having a positive electrode active material layer formed on a roughened positive electrode current collector, a negative electrode having a negative electrode active material layer containing graphite-based particles formed on a negative electrode current collector, and an electrolytic solution containing a solution of a lithium salt in an aprotic organic solvent, wherein the total thickness of the positive electrode active material layer is 50 &#x3bc;m to 140 &#x3bc;m, and the ratio of mass of the positive electrode active material layer to the sum of the mass of the positive electrode active material layer and that of the negative electrode active material layer is 0.4 to 0.5.

Lithium ion capacitor

Growing community of inventors

Kofu, Japan

Teruaki Tezuka