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New Fe-based lithium-ion battery electrode materials to extend the working life
 

April 26, 2011, NEC Chemical Industry Co., Ltd. announced that the lithium iron phosphate LiFePO4 (LithiumIronPhosphate) materials developed on the basis of new cathode material, lithium iron phosphate reduced the resistance of materials to extend the work of lithium-ion rechargeable battery life .

    But the material and electrical Chemical Industry Co., Ltd. is located in Tsu, Mie Prefecture of Japan (TsuCity, MiePrefecture) the results of cooperation SEI Group, which focused on lithium-ion rechargeable battery materials research and development.

    Currently, a large proportion of the lithium-ion rechargeable batteries are used lithium iron phosphate LiFePO4 as cathode material. The material has many advantages. The first is a high energy density, theoretical capacity of 170 mAh / g, the actual specific capacity can reach 140 mAh / g (0.2C, 25 ¡ã C conditions) or more. Followed by the safety of lithium iron phosphate does not contain harmful heavy metals, is currently the highest safety of lithium-ion battery cathode materials. Third, no memory effect, to avoid the same as a crystalline nickel batteries. The fourth is charged faster.

    Lithium iron phosphate cathode material on the battery life of the ÒªÒ»·ÖΪ¶þ to look at. The material has a higher lattice stability of lithium-ion lattice embedded rarely and the impact of prolapse, reversible good condition at 100% DOD, you can charge and discharge more than 2000 times; but the material of lithium iron phosphate relatively low electron-ion conductivity, the larger the current strength of charge - discharge will still affect the life of the next operation.

    Chemical Industry Co., Ltd. in accordance with electrical point of view, for automotive applications, the selection of the material of lithium iron phosphate batteries, the charge - discharge can increase the total life cycle. If the use of lithium iron phosphate on the basis of the development of new materials, the battery charge - discharge cycle life can reach or exceed the total number of alternative non-ferrous base level of the battery cathode material.

    The Chemical Industry Co., Ltd. Electric lithium iron phosphate added acetylene carbon black (AcetyleneBlack) and carbon nanofibers (CarbonNanofiber) as a conductive modified ingredients. Mainly composed of calcium carbide acetylene acetylene carbon black (Acetylene) by thermal decomposition (PyrolyticallyDecomposing) method is made. Curing the mixture of three materials, the conductive path can be arranged in accordance with established goal setting, thereby reducing the resistance characteristics. And the existing iron-based cathode material, the new material resistivity decreased by about 30%.

    Figure 1 is a novel cathode material in the transmission electron microscope (TransmissionElectronMicroscope) under the observation of images. Punctate distribution area for the lithium iron phosphate; carbon nano-fiber distribution lines in the diagram above. Because carbon fiber overlap each other (LapOver), presented the appearance of central tendency. Acetylene carbon black is not displayed on the map, because it is too small, attached to the top of the carbon nanofibers.

    Manufacturing process exclusive development deal with the details of the company has not yet announced. However, comparison of existing iron-based cathode material, new material during processing without the need for shredding. In addition, the treatment process also does not require additional special equipment, so the cost increase is not obvious.

    Resistivity decreases, the waste heat and other factors that affect the battery life to a certain inhibition, which can achieve the work of iron-based cathode materials with other cathode materials for life equal to or even beyond, for example, manganese (Manganese-based) materials, ternary complex materials (such as copper - tin - antimony, Cu-Sn-Sb) and other cathode materials.

    To the end of the battery service life may reduce the capacity for performance decay as much as 30%. Such as car batteries and other large lithium-ion rechargeable battery up to charge - discharge cycle life of the total number of current between about 2000-3000. However, NEC Chemical Industry Co., Ltd. that the new cathode materials for the life of even more than the above data. In the assessment phase, and the electrode with the use of new materials is a common carbon-based negative electrode materials.

    Currently, the company is working to car manufacturers, electronic component manufacturers and power companies to provide new cathode materials related to the performance of new materials to carry out assessments.

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