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권민재,한현일,신슬기,구상모,신원호,Min-Jae Kwon,Hyeon Il Han,Seulgi Shin,Sang-Mo Koo,Weon Ho Shin 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.6
Lithium-ion batteries are widely used in various applications, including electric vehicles and portable electronics, due to their high energy density and long cycle life. The performance of lithium-ion batteries can be improved by using solid electrolytes, in terms of higher safety, stability, and energy density. Li<sub>1.5</sub>Al<sub>0.5</sub>Ti<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (LATP) is a promising solid electrolyte for all-solid-state lithium batteries due to its high ionic conductivity and excellent stability. However, the ionic conductivity of LATP needs to be improved for commercializing all-solid-state lithium battery systems. In this study, we investigate the microstructures and ionic conductivities of LATP by incorporating B<sub>2</sub>O<sub>3</sub> glass ceramics. The smaller grain size and narrow size distribution were obtained after the introduction of B<sub>2</sub>O<sub>3</sub> in LATP, which is attributed to the B<sub>2</sub>O<sub>3</sub> glass on grain boundaries of LATP. Moreover, higher ionic conductivity can be obtained after B<sub>2</sub>O<sub>3</sub> incorporation, where the optimal composition is 0.1 wt% B<sub>2</sub>O<sub>3</sub> incorporated LATP and the ionic conductivity reaches 8.8×10<sup>-5</sup> S/cm, more than 3 times higher value than pristine LATP. More research could be followed for having higher ionic conductivity and density by optimizing the processing conditions. This facile approach for establishing higher ionic conductivity in LATP solid electrolytes could accelerate the commercialization of all-solid-state lithium batteries.
Kim, Su-Kyoung,Jeon, Cheonhoo,Lee, Geon-Hui,Koo, Jahyun,Cho, Seong Hwi,Han, Seulgi,Shin, Myeong-Hwan,Sim, Jae-Yoon,Hahn, Sei Kwang American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.40
<P>Noninvasive real-time biosensors to measure glucose levels in the body fluids have been widely investigated for continuous glucose monitoring of diabetic patients. However, they suffered from low sensitivity and reproducibility due to the instability of nanomaterials used for glucose biosensors. Here, we developed a hyaluronate-gold nanoparticle/glucose oxidase (HA-AuNP/GOx) complex and an ultralow-power application-specific integrated circuit chip for noninvasive and robust wireless patch-type glucose sensors. The HA-AuNP/GOx complex was prepared by the facile conjugation of thiolated HA to AuNPs and the following physical binding of GOx. The wireless glucose sensor exhibited slow water evaporation (0.11 μL/min), fast response (5 s), high sensitivity (12.37 μA·dL/mg·cm<SUP>2</SUP>) and selectivity, a low detection limit (0.5 mg/dL), and highly stable enzymatic activity (∼14 days). We successfully demonstrated the strong correlation between glucose concentrations measured by a commercially available blood glucometer and the wireless patch-type glucose sensor. Taken together, we could confirm the feasibility of the wireless patch-type robust glucose sensor for noninvasive and continuous diabetic diagnosis.</P> [FIG OMISSION]</BR>