Review on State of Charge Estimation Methods for Li-Ion Batteries

Xiaoqiang Zhang,Wei-ping Zhang,Hongyu Li,Mao Zhang 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.3

The state of charge (SOC) is an important parameter in a battery-management system (BMS), and is very significantfor accurately estimating the SOC of a battery. Li-ion batteries boast of excellent performance, and can only remainat their best working state by means of accurate SOC estimation that gives full play to their performances and raisestheir economic benefits. This paper summarizes some measures taken in SOC estimation, including the dischargeexperiment method, the ampere-hour integral method, the open circuit voltage method, the Kalman filter method,the neural network method, and electrochemical impedance spectroscopy (EIS. The principles of the various SOCestimation methods are introduced, and their advantages and disadvantages, as well as the working conditionsadopted during these methods, are discussed and analyzed.

A Review of Factors Affecting the Lifespan of Lithium-ion Battery and its Health Estimation Methods

Xiaoqiang Zhang,Yue Han,Wei-ping Zhang 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.5

With the widespread application of large-capacity lithium batteries in new energy vehicles, real-time monitoring the status of lithium batteries and ensuring the safe and stable operation of lithium batteries have become a focus of research in recent years. A lithium battery’s State of Health (SOH) describes its ability to store charge. Accurate monitoring the status of a lithium battery allows the Battery Management System (BMS) to timely adjust the working voltage, charge and discharge current, and heat dissipation efficiency. Lithium batteries have the characteristics of high energy density, high rated voltage, and low self-discharge rate. Improper use can cause accidents such as spontaneous combustion and explosion. The key to ensure stable and safe operations of a lithium battery in a system is to quickly and accurately estimate the SOH of the lithium battery. In this paper, the definition of SOH of lithium battery and the factors affecting the aging of lithium batteryare introduced. Current and predominant methods for estimating the SOH of lithium batteries are summarized. Finally, based on the problems and challenges of current SOH estimation methods of lithium battery, future research directions and emphasis areas are proposed.

A Simplified Li-ion Battery SOC Estimating Method

Xiaoqiang Zhang,Xiaocheng Wang,Wei-ping Zhang,Geyang Lei 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.1

The ampere-hour integral method and the open circuit voltage method are integrated via the extended Kalman filter method so as to overcome insufficiencies of the ampere-hour integral method and the open circuit voltage method for estimating battery SOC. The process noise covariance and the measurement noise covariance of the extended Kalman filter method are simplified based on the Thevenin equivalent circuit model, with a proposed simplified SOC estimating method. Verification of DST experiments indicated that the battery SOC estimating method is simple and feasible, and the estimated SOC error is no larger than 2%.

A New Single-Stage Small Power MH lamp Electronic Ballast

Xiaoqiang Zhang,Wei-ping Zhang,Mao Zhang 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.2

In this study, we proposed a new single-stage small power MH lamp electronic ballast and power-factor correction circuit with improved circuit by the current of passive power factor correction. Main circuit integrates traditional DC/DC and DC/AC circuits into one-stage DC/AC inverter. Moreover, we described the working principle and control strategy of the new circuit; it’s soft switching principle; and resonant element parameter design formula. An experimental prototype of HID lamp electronic ballast with output power of 70 W was built to verify the feasibility of the analysis and design. The simulation and experimental results proved that the power factor of this circuit could reach 94%, with efficiency of 90%. The input current harmonics conform to IEC 61000-3-2 standards and its cost is low. These superior performances of the new circuit indicate certain practical values.

Physicochemical stability and antibacterial mechanism of theabrownins prepared from tea polyphenols catalyzed by polyphenol oxidase and peroxidase

Xiaoqiang Chen,Tingting Chen,Jiayan Liu,Yan’an Wei,Weilong Zhou 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.1

Tea polyphenols were used as substrates and oxidized successively by polyphenol oxidase and peroxidase to prepare theabrownins (TBs-dE). The conversion rate of catechins to TBs-dE was 90.91%. The ultraviolet and infrared spectroscopic properties and zeta potential of TBs-dE were characterized. TBs-dE is more stable at pH 5.0–7.0, about 25 °C or in dark environment. Ultraviolet light and sunlight can deepen its color due to the further oxidative polymerization. Mg2+, Cu2+, and Al3+ had a significant effect on the stability of TBs-dE. The inhibitory rates of TBs-dE (1 mg/mL) against Staphylococcus aureus and Escherichia coli DH5α were 51.45% and 45.05%, respectively. After TBs-dE treatment, the cell morphology of both bacteria changed, some cell walls were blurred, and the cytoplasmic content leaked. The research results can provide theoretical support for the industrialization of theabrownins.

Recent progress in the development of fluorescent, luminescent and colorimetric probes for detection of reactive oxygen and nitrogen species

Chen, Xiaoqiang,Wang, Fang,Hyun, Ji Young,Wei, Tingwen,Qiang, Jian,Ren, Xintong,Shin, Injae,Yoon, Juyoung The Royal Society of Chemistry 2016 Chemical Society reviews Vol.45 No.10

<P>Reactive oxygen (ROS) and nitrogen (RNS) species cause oxidative and nitrosative stresses, respectively. These stresses are implicated not only in diverse physiological processes but also in various pathological processes, including cancer and neurodegenerative disorders. In addition, some ROS and RNS in the environment are pollutants that threaten human health. As a consequence of these effects, sensitive methods, which can be employed to selectively monitor ROS and RNS in live cells, tissues and organisms as well as in environmental samples, are needed so that their biological roles can be understood and their concentrations in environmental samples can be determined. In this review, fluorescent, luminescent and colorimetric ROS and RNS probes, which have been developed since 2011, are comprehensively discussed.</P>

Well-dispersed graphene toward robust lubrication via reorganization of sliding interface

Zhuang Zhao,Xiaoqiang Fan,Yuting Li,Zihan Zeng,Xiaofeng Wei,Kaiyue Lin,Minhao Zhu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-

Excellent lubrication performance of graphene lubricant is mostly attributed to the dispersion of graphene and forming of tribo-film. Herein, diethylene glycol dodecyl ether (E2C12) functionalized graphene oxide (E2C12-GO) was successfully prepared by simple esterification. The physicochemical properties of as-prepared samples were characterized by a series of characterization methods. E2C12-GO with flat edge and high-level spacing possesses high dispersion stability in PAO 20 base oil. Compared with base oil, 0.08 wt% E2C12-GO could achieve the reduction of average friction coefficient and wear rate by 30 % and 57 % at 150 N, respectively. Even with each long-term friction, E2C12-GO could still maintain the state of robust low friction coefficient. Meanwhile, the addition of E2C12-GO can significantly improve the loadbearing capacity (PB value and PD value) of base oil. The excellent tribological properties of E2C12-GO were attributed to high dispersion and high layer spacing, as well as the reorganization of sliding interface. Prospectively, the E2C12-GO shows promising potential as a multi-functional oil-based lubricating additive in industrial applications.

Laplacian-Regularized Mean Apparent Propagator-MRI in Evaluating Corticospinal Tract Injury in Patients with Brain Glioma

Jiang Rifeng,Jiang Shaofan,Song Shiwei,Wei Xiaoqiang,Deng Kaiji,Zhang Zhongshuai,Xue Yunjing 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.5

Objective: To evaluate the application of laplacian-regularized mean apparent propagator (MAPL)-MRI to brain glioma-induced corticospinal tract (CST) injury. Materials and Methods: This study included 20 patients with glioma adjacent to the CST pathway who had undergone structural and diffusion MRI. The entire CSTs of the affected and healthy sides were reconstructed, and the peritumoral CSTs were manually segmented. The morphological characteristics of the CST (track number, average length, volume, displacement of the affected CST) were examined and the diffusion parameter values, including fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), radial diffusivity (RD), mean squared displacement (MSD), q-space inverse variance (QIV), returnto- origin probability (RTOP), return-to-axis probabilities (RTAP), and return-to-plane probabilities (RTPP) along the entire and peritumoral CSTs, were calculated. The entire and peritumoral CST characteristics of the affected and healthy sides as well as those relative CST characteristics of the patients with motor weakness and normal motor function were compared. Results: The track number, volume, MD, RD, MSD, QIV, RTAP, RTOP, and RTPP of the entire and peritumoral CSTs changed significantly for the affected side, whereas the AD and FA changed significantly only in the peritumoral CST (p < 0.05). In patients with motor weakness, the relative MSD of the entire CST, QIV of the entire and peritumoral CSTs, and the AD, MD, RD of the peritumoral CST were significantly higher, whereas the RTPP of the entire and peritumoral CSTs and the RTOP of the peritumoral CST were significantly lower than those in patients with normal motor function (p < 0.05 for all). In contrast, no significant changes were found in the CST morphological characteristics, FA, or RTAP (p > 0.05 for all). Conclusion: MAPL-MRI is an effective approach for evaluating microstructural changes after CST injury. Its sensitivity may improve when using the peritumoral CST features.

Researching on X-Band Electromagnetic Interference Shielding Efficiency of MWCNTs Buckypapers Inserted with Mn Nanopowder

Shaowei Lu,Yaoyao Bai,Jijie Wang,Chenxu Zhao,Wei Li,Xiaoqiang Wang,Zhenwei Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6

Ultrathin multi-walled carbon nanotubes (MWCNTs) buckypapers inserted with Mn nanopowder were fabricated via vacuum filtration method, at a lower manufacturing cost and easier operation. The buckypapers were characterized structurally using scanning electron microscopy, energy-dispersive spectrometer and X-ray diffraction. Electromagnetic interference (EMI) shielding effectiveness (SE) of MWCNTs buckypapers inserted with Mn nanopowder (0–30 wt.%) were tested in X-band (8.2–12.4 GHz). When the blended Mn nanopowder content is 20 wt.%, the buckypaper exhibits much higher EMI SE of average value up to 42 dB with the thickness of only 0.11 mm. Further, this buckypaper is flexible and lightweight, and can be integrated with resin matrix composites. Thus, the results and techniques promise a simple and effective approach to achieve lightweight and ultrathin composite films for a wide application prospect in the field of EMI shielding and microwave absorption.

Effect of annealing temperature on resistive switching behavior of Al/ La0.7Sr0.3MnO3 /LaNiO3 devices

Li Juanfei,Wu Lei,Ma Mingyu,Song Ruifeng,Dong Chunhui,Wei Junfang,Li Jinsheng,Wang Xiaoqiang,Li Mingya 한국물리학회 2023 Current Applied Physics Vol.46 No.-

La0.7Sr0.3MnO3 (LSMO)/LaNiO3 (LNO) thin films were deposited successively on Si single crystal by the sol-gel method. The bipolar resistive switching (RS) behavior was studied in Al/LSMO/LNO devices. Obvious current hysteresis was observed, the set (reset) voltage and resistance ratio were modulated by the annealing temperature of LSMO thin films. At the annealing temperature of 750 ◦C, good endurance and retention performance were obtained in the memory device. According to the fitting results of I–V curves, based on Schottky emission model, the conduction mechanisms of Al/LSMO/LNO devices were discussed. Our results may give a valuable insight on developing perovskite-type rare earth manganese oxide.