Japan to develop a composite material for lithium battery

April 26, 2011, NEC Chemical Industry Co., Ltd. announced that the lithium iron phosphate LiFePO4 (Lithium Iron Phosphate) on the basis of developing new materials, cathode material, lithium iron phosphate material reduces the resistance, extended lithium-ion rechargeable inspiron e1405 battery ，inspiron 15 battery working life.

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

Currently, a large proportion of the lithium-ion rechargeable batteries,inspiron e1405 battery ，inspiron 15 battery 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 ° 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 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 operation will still be under the influence life.

Chemical Industry Co., Ltd. in accordance with electrical point of view, for automotive applications, the selection of the material of lithium iron phosphate batteries,inspiron 1525 battery , inspiron 1526 battery 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 (Acetylene Black) and carbon nanofibers (Carbon Nanofiber) as a conductive modified ingredients. Mainly by calcium carbide acetylene acetylene carbon black (Acetylene) by thermal decomposition (Pyrolytically Decomposing) 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 (Transmission Electron Microscope) image under observation. Punctate distribution area for the lithium iron phosphate; carbon nano-fiber distribution lines in the diagram above. As each lap of carbon fiber (Lap Over), 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 inspiron 1525 battery , inspiron 1526 battery 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 work at the end of the battery life may reduce the capacity for performance from the decay of 30%. Such as car batteries and other large lithium-ion rechargeable battery up to charge - discharge inspiron 1545 battery ，inspiron 1440 battery cycle life of the total number of current between about 2000-3000. Chemical Industry Co., Ltd. NEC, however that the life of the new cathode material and 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 inspiron 1545 battery ，inspiron 1440 battery power companies to provide new cathode materials related to the performance of new materials to carry out assessments.

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