Long-Term Stability of Primary Film Battery for Radio Frequency Identification(RFID) Tag and Ubiquitous Sensor Node
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Long-Term Stability of Primary Film Battery for Radio Frequency Identification(RFID) Tag and Ubiquitous Sensor Node Young-Gi Lee1, Junho Yeo2, Cheol Sig Pyo3, Kwangseuk Kyhm4, Kuk Young Cho5, and Kwang Sun Ryu1 1 Ionics Devices Team, Electronics & Telecommunications Research Institute(ETRI), Daejeon, 305-700, Korea, Republic of 2 RFID System Research Team, Electronics & Telecommunications Research Institute(ETRI), Daejeon, 305-700, Korea, Republic of 3 RFID/USN Research Group, Electronics & Telecommunications Research Institute(ETRI), Daejeon, 305-700, Korea, Republic of 4 Research Center for Dielectric & Advanced Matter Physics, School of Physics, Pusan National University, Pusan, 609-735, Korea, Republic of 5 Division of Advanced Materials Engineering, Kongju National University, Kongju, 303-717, Korea, Republic of
ABSTRACT We have prepared a primary film battery which shows improved shelf life and long-term stabiltiy. We tried to optimize a multi-layered packaging film by considering gas permeability, chemical affinity, and film thickness. We also optimized conducting layer thickness, cathode/anode thickness and their compositions taking N/P rato into account. We introduced a variety of hydrogel polymers, newly developed electrolyte solutions, and novel separators to enhance the ionic conductivity value of gel-type polymer electrolyte/separator system for peak power and high power property.
INTRODUCTION Primary battery has existed for over 100 years and it is a convenient source of power for portable electric and electronic devices[1-3]. In the 1970s, a film type primary battery was first innovated by Polaroid, that is, P-80 Leclanché film battery having an electrode area of approximately 5.1cm by 5.1cm and an inclusion type of film cell within the camera-film pack[4]. Up to recently, the worldwide trend in electronics, automation, communication, and health-care products is moving towards smaller, smarter, thinner, and flexible device. This development is creating a growing need for low-cost thin and flexible microelectronic solutions including micropower sources that are not subject to size or design constraints. In the 1990s, the Power Paper has developed a breakthrough technology platform that enables thin and flexible energy cells capable of powering a host of applications, especially for a battery-assisted RFID[5]. Its core technology is a process that enables the printing of caseless, thin, flexible energy cells on a polymer film substrate, not on metal current collector, by means of a simple mass-printing technology. However, these caseless film batteries have some drawbacks. Under prolonged period over 25°C or when exposed to dry atmosphere for a long time, the aqueous electrolytes
easily dry out and the internal resistance increases little by little. In addition, the open circuit voltage gradually decreases in their storing due to the self-discharge. In this study, we have tried to improve the long-term stability of film battery for good shelf life by optimizing the performance of packa
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