Effect of cathode thickness on the performance of planar Na-NiCl₂ battery

Lu, Xiaochuan,Chang, Hee Jung,Bonnett, Jeff F.,Canfield, Nathan L.,Jung, Keeyoung,Sprenkle, Vincent L.,Li, Guosheng Elsevier 2017 Journal of Power Sources Vol.365 No.-

<P><B>Abstract</B></P> <P>Na-beta alumina batteries (NBBs) are one of the most promising technologies for renewable energy storage and grid applications. Commercial NBBs are typically constructed in tubular designs, primarily because of their ease of sealing. However, planar designs are considered superior to tubular counterparts in terms of power output, cell packing, ease of assembly, and thermal management. In this paper, the performance of planar NBBs has been evaluated at an intermediate temperature. In particular, planar Na-NiCl<SUB>2</SUB> cells with different cathode loadings and thicknesses have been studied at 190 °C. The effects of the cathode thickness, charging current, and discharging power output on the cell capacity and resistance have been investigated. More than 60% of theoretical cell capacity was retained with constant discharging power levels of 200, 175, and 100 mW/cm<SUP>2</SUP> for 1x, 2x, and 3x cathode loadings, respectively. The cell resistance with 1x and 2x cathode loadings was dominated by ohmic resistance with discharging currents up to 105 mA/cm<SUP>2</SUP>, while for 3x cathode loading, it was primarily dominated by ohmic resistance with currents less than 66.67 mA/cm<SUP>2</SUP> and by polarization resistance above 66.67 mA/cm<SUP>2</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Performance of planar Na-NiCl<SUB>2</SUB> cells was primarily limited by the charging current. </LI> <LI> Cells with 1x and 2x cathodes were dominated by ohmic resistance up to 105 mA/cm<SUP>2</SUP>. </LI> <LI> The cell with 3x cathode retained 27% of the capacity at a power output of 200 mW/cm<SUP>2</SUP>. </LI> </UL> </P>

Development of intermediate temperature sodium nickel chloride rechargeable batteries using conventional polymer sealing technologies

Chang, Hee Jung,Lu, Xiaochuan,Bonnett, Jeff F.,Canfield, Nathan L.,Son, Sori,Park, Yoon-Cheol,Jung, Keeyoung,Sprenkle, Vincent L.,Li, Guosheng Elsevier 2017 Journal of Power Sources Vol.348 No.-

<P><B>Abstract</B></P> <P>Developing advanced and reliable electrical energy storage systems is critical to fulfill global energy demands and stimulate the growth of renewable energy resources. Sodium metal halide batteries have been under serious consideration as a low cost alternative energy storage device for stationary energy storage systems. Yet, there are number of challenges to overcome for the successful market penetration, such as high operating temperature and hermetic sealing of batteries that trigger an expensive manufacturing process. Here we demonstrate simple, economical and practical sealing technologies for Na-NiCl<SUB>2</SUB> batteries operated at an intermediate temperature of 190 °C. Conventional polymers are implemented in planar Na-NiCl<SUB>2</SUB> batteries after a prescreening test, and their excellent compatibilities and durability are demonstrated by a stable performance of Na-NiCl<SUB>2</SUB> battery for more than 300 cycles. The sealing methods developed in this work will be highly beneficial and feasible for prolonging battery cycle life and reducing manufacturing cost for Na-based batteries at elevated temperatures (<200 °C).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conventional polymers were adopted as sealing materials for Na-NiCl<SUB>2</SUB> batteries. </LI> <LI> Selected polymers showed excellent compatibility with sodium and melts at 190 °C. </LI> <LI> Batteries with polymer seals showed stable performances over 300 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Augmented RBF metamodel for global sensitivity analysis enhanced by recursive evolution LHD and efficient K-fold cross-validation

Guosheng Li,Jiawei Yang,Wenjie Wang,Zixuan Zhang,Weihua Zhang,Zeping Wu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8

This paper proposes an enhanced augmented radial basis function (eARBF) metamodel combining radial basis function and polynomial chaos expansions for global sensitivity analysis. First, the conditions required for the augmented radial basis function are constructed from the perspective of variance decomposition, after which the analytical expressions of the Sobol’ indices are deduced. To improve the generalization performance of ARBF, an anisotropic technique is proposed based on the local density of sample points. Furthermore, the recursive evolution LHD and efficient K-fold cross-validation method are adopted to reduce computational efforts. Five cases are presented to demonstrate the performance of the proposed approach. In all cases, eARBF yields satisfactory results with lower computational effort. The results indicate that the approach proposed in this paper is promising for GSA of engineering problems.

A Spectral Efficient NOMA-based Two-Way Relaying Scheme for Wireless Networks with Two Relays

( Guosheng Li ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.1

This paper proposes a novel two-way relaying (TWR) approach for a two-relay wireless network based on non-orthogonal multiple access (NOMA), where two terminals exchange messages with a cellular base station (BS) via two intermediate relay stations (RSs). We propose a NOMA-based TWR approach with two relaying schemes, i.e., amplify-and-forward (AF) and decode-and-forward (DF), referred to as NOMA-AF and NOMA-DF. The sum-rate performance of our proposed NOMA-AF and NOMA-DF is analyzed. A closed-form sum-rate upper bound for the NOMA-AF is obtained, and the exact ergodic sum-rate of NOMA-DF is also derived. The asymptotic sum-rate of NOMA-AF and NOMA-DF is also analyzed. Simulation results show that the proposed scheme outperforms conventional orthogonal multiple access based transmission schemes. It is also shown that increasing the transmit power budget of the relays only cannot always improve the sum-rates.

Optimal Power Allocation for NOMA-based Cellular Two-Way Relaying

Guosheng Li 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.1

This paper proposes a non-orthogonal multiple access (NOMA) based low-complexity relaying approach for multiuser cellular two-way relay channels (CTWRCs). In the proposed scheme, the relay detects the signal using successive interference cancellation (SIC) and re-generates the transmit signal with zero-forcing (ZF) transmit precoding. The achievable data rates of the NOMA-based multiuser two-way relaying (TWR) approach is analyzed. We further study the power allocation among different data streams to maximize the weighted sum-rate (WSR). We re-form the resultant non-convex problem into a standard monotonic program. Then, we design a polyblock outer approximation algorithm to sovle the WSR problem.The proposed optimal power allocation algorithm converges fast and it is shown that the NOMA-TWR-OPA scheme outperforms a NOMA benchmark scheme and conventional TWR schemes.

Sum-Rate Performance of A NOMA-based Two-Way Relay Approach for A Two-User Cellular Network

( Guosheng Li ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.5

This paper considers a cellular two-way relay network with one base station (BS), one relay station (RS), and two users. The two users are far from the BS and no direct links exist, and the two users exchange messages with the BS via the RS. A non-orthogonal multiple access (NOMA) and network coding (NC)-based decode-and-forward (DF) two-way relaying (TWR) scheme TWR-NOMA-NC is proposed, which is able to reduce the number of channel-uses to three from four in conventional time-division multiple access (TDMA) based TWR approaches. The achievable sum-rate performance of the proposed approach is analyzed, and a closed-form expression for the sum-rate upper bound is derived. Numerical results show that the analytical sum-rate upper bound is tight, and the proposed TWR-NOMA-NC scheme significantly outperforms the TDMA-based TWR and NOMA-based one-way relaying counterparts.

Assessing the Blood Supply Status of the Focal Ground-Glass Opacity in Lungs Using Spectral Computed Tomography

Guanfu Liu,Mengying Li,Guosheng Li,Zhiyong Li,Ailian Liu,Renwang Pu,Huizhi Cao,Yijun Liu 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.1

Objective: To exploit material decomposition analysis in dual-energy spectral computed tomography (CT) to assess the blood supply status of the ground-glass opacity (GGO) in lungs. Materials and Methods: This retrospective study included 48 patients with lung adenocarcinoma, who underwent a contrast-enhanced dual-energy spectral CT scan before treatment (53 GGOs in total). The iodine concentration (IC) and water content (WC) of the GGO, the contralateral and ipsilateral normal lung tissues were measured in the arterial phase (AP) and their differences were analyzed. IC, normalized IC (NIC), and WC values were compared between the pure ground-glass opacity (pGGO) and the mixed ground-glass opacity (mGGO), and between the group of preinvasive lesions and the minimally invasive adenocarcinoma (MIA) and invasive adenocarcinoma (IA) groups. Results: The values of pGGO (IC = 20.9 ± 6.2 mg/mL and WC = 345.1 ± 87.1 mg/mL) and mGGO (IC = 23.8 ± 8.3 mg/mL and WC = 606.8 ± 124.5 mg/mL) in the AP were significantly higher than those of the contralateral normal lung tissues (IC = 15.0 ± 4.9 mg/mL and WC = 156.4 ± 36.8 mg/mL; IC = 16.2 ± 5.7 mg/mL and WC = 169.4 ± 41.0 mg/mL) and ipsilateral normal lung tissues (IC = 15.1 ± 6.2 mg/mL and WC = 156.3 ± 38.8 mg/mL; IC = 15.9 ± 6.0 mg/mL and WC = 174.7 ± 39.2 mg/mL; all p < 0.001). After normalizing the data according to the values of the artery, pGGO (NIC = 0.1 and WC = 345.1 ± 87.1 mg/mL) and mGGO (NIC = 0.2 and WC = 606.8 ± 124.5 mg/mL) were statistically different (p = 0.049 and p < 0.001, respectively), but not for the IC value (p = 0.161). The WC values of the group with preinvasive lesions and MIA (345.4 ± 96.1 mg/mL) and IA (550.1 ± 158.2 mg/mL) were statistically different (p < 0.001). Conclusion: Using dual-energy spectral CT and material decomposition analysis, the IC in GGO can be quantitatively measured which can be an indicator of the blood supply status in the GGO.

A study on effects of water-cement ratio and crack width on chloride ion transmission rate in concrete

Yue Li,Xiaohan Chen,Guosheng Zhang 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.4

To study the effects of water-cement ratio changes and cracks on chloride ion transmission rate in cracked concrete, RCM method was adopted to accelerate the diffusion of chloride ion in cracked concrete, and the changes in chloride ion concentration and around the cracks are inferred by finite-element method. The test results show that as far as prefabricated cracks on concrete components are concerned, the width thresholds of two cracks on the concrete specimens with a water-cement ratio of 0.5 and 0.6 are 0.05 mm and 0.1 mm respectively, the width threshold of two cracks on the concrete specimens with a water-cement ratio of 0.4 is 0.05 mm and 0.2 mm respectively; and the results of numerical simulation show that the smaller the water-cement ratio is, the more significant effects of cracks on chloride ion transmission rate are. As a result, more attention shall be paid to the crack prevention, repairing and strengthening for high-strength concrete.

Environment-dependent Broadband Perfect Absorption of Metal-insulator-metal Metamaterial Systems

Feng Li,Yulong Tang,Qingsong Peng,Guosheng Hu 한국광학회 2023 Current Optics and Photonics Vol.7 No.2

Based on calculations using the macroscopic Maxwell’s equations with mesoscopic boundary conditions, light absorption by a layered metal-insulator-metal (MIM) metamaterial system embedded in three different environments is investigated. Increasing the top metal thickness shifts the broad absorption band to lower dielectric-constant regions and longer wavelengths, for either TM or TE waves. Boosting the dielectric-layer thickness redshifts the broadband absorption to regions of larger dielectric constant. In air, for the dielectric-constant range of 0.86–3.40, the absorption of the system exceeds 98% across680–1,033 nm. In seawater with optimized dielectric constant, ≥94% light absorption over 400–1,200nm can be achieved; particularly in the wavelength range of 480–960 nm and dielectric-constant range of 0.82–3.50, the absorption is greater than 98%. In an environment with even higher refractive index(1.74), ≥98% light absorption over 400–1,200 nm can be achieved, giving better performance. Theinfluence of angle of incidence on light absorption of the MIM system is also analyzed, and the angle tolerance for ≥90% broadband absorption of a TM wave is up to 40° in an environment with large re-fractive index. While the incident-angle dependence of the absorption of a TE wave is nearly the same for different circumstances, the situation is different for a TM wave.

Discovery of a Fluoroquinolone-Resistant Serratia marcescens Clinical Isolate without Quinolone Resistance-Determining Region Mutations

Haifei Yang,Guosheng Chen,Jun Cheng,Yanyan Liu,Li-Fen Hu,Ying Ye,Jia-Bin Li 대한진단검사의학회 2014 Annals of Laboratory Medicine Vol.34 No.6

Sir, Serratia marcescens , once considered to be an innocuous and non-pathogenic organism, is now an important cause of hospital- acquired infections. This organism is associated with respiratory tract infections, urinary tract infections, septicemia, meningitis, and wound infections [1, 2]. S. marcescens infections are difficult to treat because of high resistance to a wide variety of antibiotics, including cephalosporins, fluoroquinolones, and aztreonam [2].