NEC, develops manganese lithium ion secondary batteries have twice the lifespan of conventional

NEC is October 17, compared with a conventional commercially available battery electrolyte solution, has announced that it has developed a manganese-based lithium-ion battery technology improved to more than double the life.

The technology, in addition to newly developed electrolyte additives, combined with those of carbon negative electrode / positive electrode of a conventional manganese. Multilayer laminate 3.7Ah battery capacity using the same technology (65Wh/kg) prototype, and life prediction was conducted based on the pattern of a typical household energy consumption, 70% of initial capacity rechargeable years before the drop, about 13 years from the traditional five years, became at 50% to about 33 years, I realized that not more than twice as long life.

In previous studies, when using a cathode manganese in batteries for stationary that require high durability, making a discharge repeatedly, or is formed in the coating in the shape of the anode is decomposed solvent of the electrolyte, due to the electrolyte and to the gradual dissolution of manganese positive electrode, a problem that had been confirmed to decrease the resistance of the battery capacity is high.

Until now, in negative battery / carbon manganese positive electrode, the improvements have been made using a durable additive to the electrolyte, it did not get a sufficient characteristics. Technology has been developed, the use of organic sulfur compounds has its own additives to form a protective film solid on the electrode charge and discharge one, it is possible to suppress the decomposition of the solvent point is the point. I evaluated the basis for developing electrolyte, 1 / 2 increase in resistance compared with conventional, conventional and 1.5 to 3 times the life cycle, it is not suppressed by the loss of capacity repeatedly charging and discharging.

In addition, the durability evaluation test was carried out using a prototype of the above batteries, 3500 cycles 20,000 (more than four consecutive years) to discharge, 83% of the initial capacity (25 ℃) was demonstrated to maintain . The contents of the durability evaluation test, 25 ℃, 45 ℃, at 55 ℃, with an increased capacity retention and resistance of the discharge cycle test by shaking in 1 hour and 1 hour to fully charge, at the same temperature storage test (state of charge, SOC: 60%) due to capacity, they were comprehensively evaluated and increased resistance.

Also, this battery technology, which started in July 2011 year, New Energy and Industrial Technology Development Organization, IAA (NEDO) project "Development of low-cost large-scale energy storage system technology security (large storage Development Board or the safety of long-life lithium ion battery system assuming Mn) "was also announced that they will use.

In addition, the battery technology of the time, as well as installation in buildings and homes have been and are also suitable for use in storage systems large for the purpose of stabilization of power systems that require higher durability.