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Monday, September 24, 2007
Hitachi Maxell Announces Development of High-PowerLithium Ion Rechargeable Battery

Hitachi Maxell has announced that it has developed an 18650-type high-power cylindrical lithium ion rechargeable battery (diameter: 18mm, height: 65mm).

In addition to realizing a high output of up to 20 amps, the new battery offer outstanding safety, according to Maxell. The Japanese company will begin sample shipments at the end of 2007 and begin product shipments from spring 2008.

In the market for mid-size rechargeable batteries, demand of high-power required products are increased for such applications as electric power tools, electrically assisted bicycles, electric motorcycles, and cordless home appliances. The batteries included in such products require large current discharges, ranging from several amps to several tens of amps. At present, those high outputs are principally achieved by using nickel-cadmium batteries or nickel-metal hydride rechargeable batteries. However, recently there has been a rapidly emerging trend toward the replacement of those batteries with lithium ion rechargeable batteries due to increasing concerns about environmental problems and efforts to make products lighter.

Maxell has developed a high-power cylindrical lithium ion rechargeable battery capable of large current discharges, which were regarded as an obstacle to the use of lithium ion rechargeable batteries for high-output applications. Maxell has enabled large current discharges and realized a maximum output of 20 amps by reducing the internal resistance of the positive electrode through the application of the Company?s original technology for uniform dispersion processes and by using a specially treated negative electrode material. Further, the Company has realized a battery with even greater safety through the use of Maxell?s original positive electrode composition, which includes a spinel-type lithium manganese oxide that has high thermal stability, and the use of a separator that has minimal thermal contraction.

Maxell has exploited its high-precision packing technology and thin-film coating technology for magnetic tapes to develop and market high-capacity prismatic lithium ion rechargeable batteries.

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