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- 2018
- Battery energy storage systems
- techno-economic modeling
- photovoltaics
- net-metering
- solar power
- PV-wind-diesel-battery system
- Capacity optimization
- PSO algorithm
- Economic and technical indexes
- photovoltaic generation
- Electrical Engineering and Automation
- Aristotle University of Thessaloniki
- Wuhan university of technology
- University of Calgary
- Western Macedonia University of Applied Sciences
- Technological Educational Institute of Thessaly
- SINOMACH Intelligence Technology Research Institute
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Atomic-thick TiO <sub/>2</sub> (B) nanosheets decorated with ultrafine Co <sub/>3</sub> O <sub/>4</sub> nanocrystals as a highly efficient catalyst for lithium-oxygen battery
摘要： Development of high efficient catalysts based on transition metal oxides (TMOs) is desirable, and remains a big challenge for lithium-oxygen (Li-O2) batteries. In the present work, atomic-thick TiO2(B) nanosheets decorated with ultrafine Co3O4 nanocrystals (Co3O4-TiO2(B)) was synthesized and utilized as cathode catalyst in Li-O2 batteries by designing a hybrid and inducing oxygen vacancies. The XPS characterization results suggested that the introduction of Co3O4 nanocrystals could induce numerous oxygen vacancies in the TiO2(B) nanosheets through Co doping in the hybrid catalyst. The subsequent electrochemical experiments indicated that the Li-O2 batteries with the prepared hybrid catalysts showed high specific capacity (11000 mAhg-1), and good cycling stability (200 cycles at a limited capacity of 1000mAhg-1) with low polarization (above 2.7V for discharge medium voltage and below 4.0V for charge medium voltage within 80 cycles). Furthermore, a possible working mechanism was proposed for a better understanding of the high performance of Co3O4-TiO2(B) catalysts for the Li-O2 batteries. This work also provided some new insights into designing efficient catalysts through interface engineering between 2D (two dimentional) TMOs and 0D (zero dimentional) TMOs for Li-O2 batteries or other catalysis related fields.
关键词： film-like Li2O2,oxygen vacancies,TiO2(B) nanosheets,Co3O4 nanocrystals,Li-O2 battery
更新于2025-09-23 15:21:21
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Electrochemical and Structural Investigation on Ultrathin ALD ZnO and TiO <sub/>2</sub> Coated Lithium-Rich Layered Oxide Cathodes
摘要： Ultrathin coatings (1.5 ± 0.3 nm) of titanium dioxide and zinc oxide were deposited on lithium-rich layered oxide cathodes (Li1.2Mn0.6Ni0.2O2, LLO) by atomic layer deposition (ALD). The structures, electrochemical performances, and thermal stabilities of these coatings were investigated. An ultrathin uniform coating was obtained for TiO2 but not for ZnO because of di?erences in the layer growth mechanism. Regarding the initial charge?discharge curves under a current density of 0.04 C rate, the TiO2 coated samples exhibited a higher discharge capacity, 242 mAhg?1, compared with the ZnO coated samples, 220 mAhg?1, or the pristine samples, 228 mAhg?1. Both coated samples exhibited more stable cycling performance and thermal stability than the pristine samples. After 80 cycles under 0.5 C rate, the TiO2 and ZnO coated samples were found to have higher capacity retention (～94% and 78%, respectively) than the pristine samples (68%). The reaction temperature of the exothermic peak of the TiO2 and ZnO coated samples at 4.8 V shifted to 280 °C with heat release of 88.7 J/g for TiO2 and 270 °C with heat release of 154.6 J/g for ZnO. This is compared with an exothermic peak at 258 °C with heat release of 253.5 J/g for the pristine sample. In particular, an enhanced rate capability was only observed for the TiO2 coated samples. When the current densities were higher than 2 C rate, the TiO2 coated samples exhibited superior capacities than the pristine and ZnO coated samples. At a current density of 5 and 10 C rate, the capacities were found to be 120 and 95 mAhg?1. The improved electrochemical performances were mainly attributed to lower resistance ?lm. This feature lead to more preactivation of the charge transfer, which resulted from the layer morphology of the TiO2 LLO, smoother electron transport, and suppression of more side reactions, when compared with the island structure of the ZnO ?lm.
关键词： ZnO,Cathode,Atomic layer deposition,Lithium-rich layered oxides,TiO2,Lithium ion battery
更新于2025-09-23 15:21:21
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[IEEE 2018 International Power Electronics Conference (IPEC-Niigata 2018 –ECCE Asia) - Niigata, Japan (2018.5.20-2018.5.24)] 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) - Green Base Station Using Robust Solar System and High Performance Lithium ion battery for Next Generation Wireless Network (5G) and against Mega Disaster
摘要： To secure wireless communication services, we are researching and developing disaster-resistant and environmentally friendly green base stations. One effective disaster countermeasure in carriers is to make backup time long for base stations during a power outage. Therefore, we have developed a photovoltaics (PV) system for green base stations to prolong the backup. In this paper, we propose a power control method that realizes long-term autonomous operation by PV and lithium-ion batteries (LiB) and regeneration operation by only PV for when commercial power is lost during a power outage and describe the results obtained at field test station.
关键词： Lithium- ion battery,Green Base Station
更新于2025-09-23 15:21:21
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[ACM Press the 24th Annual International Conference - New Delhi, India (2018.10.29-2018.11.02)] Proceedings of the 24th Annual International Conference on Mobile Computing and Networking - MobiCom '18 - Battery-Free Eye Tracker on Glasses
摘要： This paper presents a battery-free wearable eye tracker that tracks both the 2D position and diameter of a pupil based on its light absorption property. With a few near-infrared (NIR) lights and photodiodes around the eye, NIR lights sequentially illuminate the eye from various directions while photodiodes sense spatial patterns of reflected light, which are used to infer pupil’s position and diameter on the fly via a lightweight inference algorithm. The system also exploits characteristics of different eye movement stages and adjusts its sensing and computation accordingly for further energy savings. A prototype is built with off-the-shelf hardware components and integrated into a regular pair of glasses. Experiments with 22 participants show that the system achieves 0.8-mm mean error in tracking pupil position (2.3 mm at the 95th percentile) and 0.3-mm mean error in tracking pupil diameter (0.9 mm at the 95th percentile) at 120-Hz output frame rate, consuming 395μW mean power supplied by two small, thin solar cells on glasses side arms.
关键词： photodiodes,near-infrared,pupil tracking,energy savings,wearable,battery-free,eye tracker
更新于2025-09-23 15:21:21
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A novel photovoltaic battery energy storage system based on modular multilevel converter
摘要： Modular multilevel converters (MMCs) have been widely applied in photovoltaic battery energy storage systems (PV-BESSs). In this paper, a novel topology of PV-BESS based on MMC is proposed, where the batteries are connected to the sub-modules through DC-DC converters. It is necessary to analyze the control strategies of both DC-DC converters and MMC. Specifically, the capacitor voltage balancing and the modulation mode are important. The sorting method is proposed to balance the capacitor voltages in this paper. Moreover, carrier phase shift-square wave modulation with the highest voltage utilization ratio and the highest power transfer capability is proposed to generate PWM singles for MMC-PV-BESS. In order to verify the availability of the proposed control strategy, a simulation model is built and related experiments are carried out. The simulation results and experimental results are consistent with the theory. As a result, the voltages of all capacitors could be balanced, and the MMC-PV-BESS could reliably work.
关键词： photovoltaic,modular multilevel converter,battery energy storage system,DC-DC converter,control strategy
更新于2025-09-23 15:21:21
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Optimization of synthesis condition of water-resistant and thin titanium oxide layer-coated Ni-rich layered cathode materials and their cathode performance
摘要： In this study, in order to develop water-resistant LiNiaCobAl1?a?bO2 (a > 0.85, NCA) cathode materials which exhibit high-rate performance, the surface coating of NCA with titanium oxide (TiOx) was examined. The synthesis conditions for the TiOx-coated NCA cathode materials were investigated, by taking into account some essential factors in the surface coating of NCA by TiOx, with a view to improving the rate performance. We successfully prepared the TiOx-coated NCA cathode material, the rate performance of which is superior to that of the conventionally prepared NCA cathode materials, typically using a polyvinylidene difluoride (PVdF) binder and N-methyl-2-pyrrolidone (NMP) solvent. Their surface analysis suggested that the specific surface structure of TiOx layer coated on the NCA particle leads to both a water-resistant property and a high permeability of Li+ ions through it in the charging/discharging process.
关键词： Lithium ion secondary battery,Water-based hybrid polymer binder,TiOx coating layer,Water resistance,Ni-rich lithium transition metal oxide
更新于2025-09-23 15:21:21
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A Soft-switched, Multiport Photovoltaic Power Optimizer with Integrated Storage Interface and Output Voltage Regulation
摘要： This paper proposed a multiport converter (MPC) configuration for photovoltaic (PV)-battery system. In the battery charging and discharging circuits are integrated with the PV power optimizer through high frequency AC link. The proposed converter system is capable of regulating the output voltage, following battery charging profile and tracking the maximum power point (MPP) of each PV module. Variable switching frequency is used to achieve MPPT in this design. All the switches of the converter are able to achieve soft-switching turn on and turn off at different operating conditions. The operating principles and the control strategy of the proposed converter are presented. Simulation results and experimental results on a 175W system are presented to validate the features of the proposed converter.
关键词： Soft-switching,Multi-resonant converter,Multiport converter (MPC),MPPT,battery charging profile,PV-battery system
更新于2025-09-23 15:21:01
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Optimal location identification for aggregated charging of electric vehicles in solar photovoltaic powered microgrids with reduced distribution losses
摘要： The battery-powered electric vehicle finds an alternative for fossil fuel-based vehicles in the transportation sector. The charge-discharge power profiles of the battery storage systems (BSS) contribute toward distribution losses, which can be minimized by proper scheduling. Such scheduling gives better results if the charging stations are optimally placed in the solar photovoltaic (PV) powered microgrid. This paper proposes a methodology to identify the optimal location to charge the electric vehicle in the microgrid. The proposed methodology has been developed using particle swarm optimization (PSO)-based optimal power flow (OPF) with an integrated power management (IPM) algorithm. The novelty of the IPM algorithm is the coordinated charging-discharging of the multiple numbers of aBSS of the EVs to reduce the overall distribution losses of the microgrid. The proposed methodology is tested in a standard solar PV powered microgrid network, where the optimal locations to charge the electric vehicles are identified. The daily distribution loss of the network is computed for all possible charging locations of the electric vehicle in the microgrid, and it is found that the distribution loss is minimum for the identified optimal locations. Also, to evaluate the effectiveness of the proposed methodology, the distribution loss analysis is carried out for three test cases; i) un-optimized power flow, ii) PSO based-OPF, and iii) PSO-based OPF with IPM. The case study shows that the PSO-based OPF gives 84% reduction in daily distribution loss compared to the conventional un-optimized power flow test case. The daily distribution loss is further reduced by 8% by incorporating the IPM algorithm in the PSO-based OPF. The utility can thereby encourage the electric vehicle (EV) owners to park their EVs at the optimal locations to reduce the distribution losses.
关键词： microgrid,particle swarm optimization,Battery storage systems,renewable generation,electric vehicle,optimal location
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 9th International Conference on Consumer Electronics (ICCE-Berlin) - Berlin, Germany (2019.9.8-2019.9.11)] 2019 IEEE 9th International Conference on Consumer Electronics (ICCE-Berlin) - Case Study of Photovoltaic Energy Surplus Absorption by Charging Lithium-Ion Batteries Considering Chargea??Discharge Energy Efficiency
摘要： In Autumn 2018, reductive control of photovoltaic surplus energy was performed in Kyushu, Japan. This was a lost opportunity to utilize renewable energy, which could have been otherwise stored in rechargeable batteries. In this study, we simulated the absorption of the photovoltaic energy surplus by charging battery systems of a working electric vehicle considering the energy efficiency of lithium-ion battery systems to reduce the operation cost. This study clarified the quantitative effects of a real-time energy efficiency diagnosis of lithium-ion battery systems. From the simulation results, we discovered that the improvements of the charge–discharge energy loss and the economic gain of the photovoltaic energy surplus absorption depended on the input–output power of the bidirectional vehicle- to-grid charger and the amount of surplus energy. When the input–output power is sufficiently high and the ratio of surplus energy to total capacity of the battery systems is sufficiently low, is the reasonable. The real-time degradation diagnosis of the battery systems and selection considering charge–discharge energy efficiency is necessary to improve the profit from surplus energy absorption.
关键词： charge – discharge energy efficiency,Lithium-ion battery,degradation diagnosis,photovoltaic surplus energy,working electric vehicle
更新于2025-09-23 15:21:01
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High-Performance Photovoltaic Hydrogen Sensing Platform with a Light-Intensity Calibration Module
摘要： Although battery-free gas sensors (e.g., photovoltaic, or triboelectric sensors) have been recently appeared to resolve the power consumption issue of conventional chemiresistors, severe technical barriers remain. Especially, their signals varying with ambient conditions such as light intensity confines the utilization of the sensors. Insufficient sensing performances (low response and slow sensing rate) of the previous battery-free sensors are also an obstacle for practical use. Herein, a photovoltaic hydrogen (H2) sensing platform having constant sensing responses regardless of light condition is demonstrated. The platform consists of two photovoltaic units: (1) a palladium (Pd)-decorated n-IGZO/p-Si photodiode covered with a microporous zeolitic imidazolate framework-8 (ZIF-8) film and (2) the same device configuration without the Pd catalyst as a reference to calibrate the base current of the sensor (1). The platform after calibration yields accurate response values in real-time regardless of unknown irradiance. Besides, the sensing performances (e.g., sensing response of 1.57 × 104% at 1% H2 with a response time < 15 s) of our platform is comparable with those of the conventional resistive H2 sensors, which are unprecedented results in photovoltaic H2 sensors.
关键词： zeolitic imidazolate framework,hydrogen sensor,battery-free gas sensor,light-intensity calibration module,photovoltaic gas sensor
更新于2025-09-23 15:21:01