Japanese company MICRONICS, specializing in semiconductor measuring instruments, has partnered with GUALA TECHNOLOGY Co., Ltd., a materials application risk firm based in Kobe, to develop a mass production technology for a new type of secondary battery called "battenice." The technology is expected to enable sample shipments starting in 2014. This innovative battery offers several advantages over traditional lithium-ion batteries.
First, it can be manufactured as a thin film using cost-effective methods, making it ideal for integration into wearable devices, flexible displays, and printed substrates. Its flexible design allows it to be shaped in various forms, expanding its potential applications.
Second, the all-solid-state construction eliminates the risk of liquid leakage and avoids the use of flammable materials, making it safer and more reliable. It also doesn't rely on rare metals or rare earth elements. The battery has already achieved over 10,000 charge-discharge cycles, with promising performance metrics such as an output voltage of 1.5V, energy density of 500Wh/L, power density of 8000W/L, and a cycle life of 100,000 times. It can operate effectively between -25°C and +85°C.
The prototype includes a 100mm square battery, a stacked version with 8 thin films connected in parallel, and a 300mm square, 11μm thick film. These were showcased at the 5th International Secondary Battery Exhibition in Tokyo in February 2014, where they were used alongside organic EL lighting fixtures. The design is not only compact but also highly portable, enabling users to power flexible lighting systems anytime.
Unlike conventional lithium-ion batteries, the battenice battery uses quantum technology rather than chemical reactions for charging and discharging. It stores energy in n-type metal oxide semiconductors coated with insulating layers, such as titanium dioxide (TiOâ‚‚), tin oxide (SnOâ‚‚), and zinc oxide (ZnO). During manufacturing, ultraviolet light creates new energy levels within the band gap, allowing electrons to be stored and released efficiently.
MICRONICS has produced trial samples of various sizes, including 100mm and 300mm squares, with thicknesses as low as 10μm. They have also developed multi-layered versions, with plans to expand further. The manufacturing process uses a roll-to-roll technique, which is cost-effective and eliminates the need for long aging periods typically required in chemical batteries.
Substrates like stainless steel and aluminum foils are currently used, but the company is exploring ways to reduce baking temperatures, potentially allowing the use of resin materials in the future. According to patent WO2012046325A1, the manufacturing method involves sputtering, spin-coating, and UV irradiation to form the charging layer, followed by the deposition of p-type semiconductors and electrodes.
Despite its promise, challenges remain in increasing energy density. Thinning the substrate while thickening the charging layer could help, but technical hurdles such as uniform UV exposure and handling thin films still exist. If these issues are resolved, the battery's energy density could be significantly improved beyond the current 500Wh/L estimate.
This groundbreaking technology marks a significant step forward in the development of safe, flexible, and high-performance energy storage solutions.
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