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Kim, Junghoon,Kim, Oosup,Park, Chanhwi,Lee, Giho,Shin, Dongwook The Electrochemical Society 2015 Journal of the Electrochemical Society Vol.162 No.6
<P>The over-stoichiometric Li<SUB>1+x</SUB>CoO<SUB>2</SUB> (x = 0.1, 0.2, and 0.3) cathode materials were synthesized from an aqueous solution of lithium nitrate (LiNO<SUB>3</SUB>) as an excess lithium precursor and their effects on the electrochemical properties of all-solid-state lithium batteries employing Li<SUB>2</SUB>S-P<SUB>2</SUB>S<SUB>5</SUB> glass-ceramics solid electrolytes are investigated. A combination of X-ray diffraction, Fourier transform infrared spectroscopy, and inductively coupled plasma atomic emission spectroscopy reveals that the excess lithium forms a residual Li<SUB>2</SUB>CO<SUB>3</SUB> layer on the surface of as-prepared Li<SUB>1+x</SUB>CoO<SUB>2</SUB> particles during the synthesis process. While regarded as an impurity phase in lithium battery systems using liquid electrolytes due to its detrimental effects on electrochemical performance, the Li<SUB>2</SUB>CO<SUB>3</SUB> formed on the surface of the over-stoichiometric Li<SUB>1+x</SUB>CoO<SUB>2</SUB> powders is identified in all-solid-state lithium battery systems using sulfide solid electrolytes to act as an effective coating material to suppress the interfacial side reactions despite its low ionic and electronic conductivity.</P>
Multi-band Internal antenna for DVB-H and GSM services
Jeongpyo Kim,Giho Kim,Wonmo Seong,Jaehoon Choi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
We propose a multi-band internal antenna for the DVB-H and the GSM services. The proposed antenna consists of a tunable PIFA for the DVB-H service and a dual band folded monopole for the GSM 900 and the DCS 1800. The resonant frequencies of the designed antenna are independently adjusted. It can be used for a complex mobile set for a broadcasting service.
A Tunable Internal Antenna With an Epsilon Negative Zeroth Order Resonator for DVB-H Service
Jeongpyo Kim,Giho Kim,Wonmo Seong,Jaehoon Choi IEEE 2009 IEEE transactions on antennas and propagation Vol.57 No.12
<P>A tunable internal antenna with an epsilon negative zeroth order resonator (ENG-ZOR) for digital video broadcasting-handheld service is proposed in this paper. The antenna consists of two helical radiators, an ENG ZOR with two inductors and a variable capacitor to adjust the resonant frequency. The resonant frequency of the designed antenna can be swept from 474-702 MHz by adjusting the capacitance of the variable capacitor by controlling the DC bias voltage. The proposed antenna has a very compact size of 40 mm times 5 mm times 5 mm.</P>