Hitachi Maxell Ltd exhibited a laminated lithium-ion (Li-ion) battery for reference at the 1st Int'l Rechargeable Battery Expo, which took place from March 3 to 5, 2010, in Tokyo.
The battery, "IMS65142235," is currently under development and 6.5mm thick, 142mm wide and 235mm long. Its rated capacity, nominal voltage, final voltage and maximum current are 10Ah, 3.7V, 2.75V and 30A, respectively. Hitachi Maxell expects that the battery will be used for the power supplies of electric bikes, automated guided vehicles, etc and uninterruptible power supply systems.
The company claims that it enhanced the safety by improving the material and structure of the positive electrode and utilizing a highly heat-resistant separator.
The positive electrode is made with a material containing a spinel-type manganese oxide, which has a high heat stability. And polyethylene resin coated with an inorganic material is used for the separator. The electrolyte is a liquid but suited for lamination. The heat stability was enhanced by choosing an appropriate inorganic material and improving the method of applying it to polyethylene resin.
In addition to the laminated Li-ion battery, Hitachi Maxell exhibited a cylindrically-shaped Li-ion battery that has a high energy density. The company's existing cylindrically-shaped Li-ion batteries have a high output density and can output 15-20A current. Though they are suited for electric power tools, their capacities are not enough for power-assisted bicycles and so forth, and their discharge properties are insufficient for use under low temperature conditions from 0 to -20°C.
This time, Hitachi Maxell enhanced the energy density of the cylindrically-shaped Li-ion battery and its discharge properties under low temperatures by reviewing the compositions and production processes of the positive- and negative-electrode materials and the electrolyte.
The battery measures approximately 18.3mm in diameter and 64.95mm in length. Its mass, rated capacity, nominal voltage, final voltage, maximum current and mass energy density are 45g, 2,250mAh, 3.7V, 2.75V, 6A and 185Wh/kg.
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