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Novel PETEA-based grafted gel polymer electrolyte with excellent high-rate cycling performance for LiNi0.5Co0.2Ni0.2Mn0.3O2 lithium-ion batteries

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 2022年 613卷 606-615页

作者： Zhou, Liangyan Zhao, Hongshun Liang, Kang Chen, Jinyuan Li, Jianbin Huang, Xiaobing Qi, Yanli Ren, Yurong Changzhou Univ Changzhou Key Lab Intelligent Mfg & Adv Technol P Jiangsu Prov Engn Res Ctr Intelligent Mfg Technol Sch Mat Sci & EngnChangzhou Key LabVital Techno Changzhou 213164 Jiangsu Peoples R China Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Control Technol Distributed El Hunan Prov Key Lab Water Treatment Funct Mat Changde 415000 Peoples R China

Due to the higher specific capacity and operating voltage platform of the ternary cathode material (LiCoxNiyMn1-x-yO2), it has a specific market application in the electric vehicle (EV) industry. Gel polymer electrolytes (GPEs) have proven to be an effective method of resolving this issue. As a result of its high conductivity and safety performance, pentaerythritol tetraacrylate (PETEA) is a promising gel polymer electrolyte. Butyl methacrylate (BMA) was successfully grafted onto PETEA to decrease its stiffness in this study. Surprisingly, after cycling for 100 cycles at a rate of 2 C, the cycle retention rate of the half-cell of NCM523/GPE/Li reached 63.9%, whereas the utilization of liquid electrolyte ceased to function normally. The successfully prepared PETEA-g-BMA GPE by in-situ thermal polymerization formed a three-dimensional network structure. The PETEA-g-BMA GPE effectively protected the structure of the cathode material during the lithium-ion charging and discharging process, inhibited the occurrence of side reactions, and minimized the risk of thermal runaway. The straightforward preparation process and low cost make industrial applications a possibility in the future. (C) 2021 Elsevier Inc. All rights reserved.

关键词： Gel polymer electrolytes LiCoxNiyMn1-x-yO2 cathode Graft copolymer Rate performance

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Interface-Driven Pseudocapacitance Endowing Sandwiched CoSe₂/N-Doped Carbon/TiO₂ Microcubes with Ultra-Stable Sodium Storage and Long-Term Cycling Stability

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ACS APPLIED MATERIALS & INTERFACES 2021年第51期13卷 61555-61564页

作者： Zhao, Hongshun Qi, Yanli Liang, Kang Li, Jianbin Zhou, Liangyan Chen, Jinyuan Huang, Xiaobing Ren, Yurong Changzhou Univ Jiangsu Prov Engn Res Ctr Intelligent Mfg Technol Sch Mat Sci & Engn Changzhou Key Lab Intelligent Mfg & Adv Technol P Changzhou 213164 Peoples R China Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Control Technol Distributed El Hunan Prov Key Lab Water Treatment Funct Mat Changde 415000 Peoples R China

Cobalt diselenide (CoSe2) has drawn great concern as an anode material for sodium-ion batteries due to its considerable theoretical capacity. Nevertheless, the poor cycling stability and rate performance still impede its practical implantation. Here, CoSe2/nitrogen-doped carbon-skeleton hybrid microcubes with a TiO2 layer (denoted as TNC-CoSe2) are favorably prepared via a facile template-engaged strategy, in which a TiO2-coated Prussian blue analogue of Co-3[Co(CN)(6)](2) is used as a new precursor accompanied with a selenization procedure. Such structures can concurrently boost ion and electron diffusion kinetics and inhibit the structural degradation during cycling through the close contact between the TiO2 layer and NC-CoSe2. Besides, this hybrid structure promotes the superior Na-ion intercalation pseudocapacitance due to the well- designed interfaces. The as-prepared TNC-CoSe2 microcubes exhibit a superior cycling capability (511 mA h at 0.2 A g(-1) after 200 cycles) and long cycling life (456 mA h at 6.4 A g(-1) for 6000 cycles with a retention of 92.7%). Coupled with a sodium vanadium fluorophosphate (Na3V2(PO4)(2)F-3)@C cathode, this assembled full cell displays a specific capacity of 281 mA h g(-1) at 0.2 A g(-1) for 100 cycles. This work can be potentially used to improve other metal selenide-based anodes for rechargeable batteries.

关键词： CoSe2 anode TiO2 coating pseudocapacitance sodium-ion full cell

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Dual-element-Modified Single-Crystal LiNi0.6Co0.2Mn0.2O2 as a Highly Stable Cathode for Lithium-Ion Batteries

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ACS APPLIED MATERIALS & INTERFACES 2021年第36期13卷 43039-43050页

作者： Feng, Ze Zhang, Shan Rajagopalan, Ranjusha Huang, Xiaobing Ren, Yurong Sun, Dan Wang, Haiyan Tang, Yougen Cent South Univ Hunan Prov Key Lab Chem Power Sources Hunan Prov Key Lab Efficient & Clean Utilizat Man Coll Chem & Chem Engn Changsha 410083 Peoples R China Hunan Univ Arts & Sci Hunan Prov Key Lab Control Technol Distributed El Hunan Prov Key Lab Water Treatment Funct Mat Coll Chem & Mat Engn Changde 415000 Peoples R China Changzhou Univ Jiangsu Prov Intelligent Mfg Technol Engn Res Ctr Sch Mat Sci & Engn Changzhou 213164 Peoples R China

Single-crystalline LiNi0.6Co0.2Mn0.2O2 cathodes have received great attention due to their high discharge capacity and better electrochemical performance. However, the single-crystal materials are suffering from severe lattice distortion and electrode/electrolyte interface side reactions when cycling at high voltage. Herein, a unique single-crystal LiNi0.6Co0.2Mn0.2O2 with Al and Zr doping in the bulk and a self-formed coating layer of Li2ZrO3 in the surface has been constructed by a facile strategy. The optimized cathode material exhibits excellent structural stability and cycling performance at room/elevated temperatures after long-term cycling. Specifically, even after 100 cycles (1C, 3.0-4.4 V) at 50 degrees C, the capacity retention for the Al and Zr co-doped sample reaches 92.1%, which is much higher than those of the single Al-doped (85.4%), single Zr-doped (87.1%), and bare samples (76.3%). The characterization results and first-principles calculations reveal that the excellent electrochemical properties are attributed to the stable structure and interface, in which the Al and Zr co-doping hinders cation mixing and suppresses detrimental phase transformations to reduce internal stress and mitigate microcracks, and the coating layer of Li2ZrO3 can protect the surface and suppress interfacial parasitic reactions. Overall, this work provides important insights into how to simultaneously build a stable bulk structure and interface for the single-crystal NCM cathode via a facile preparation process.

关键词： single crystalline LiNi0.6Co0.2Mn0.2O2 cathodes Al and Zr doping Li2ZrO3 coating cation mixing first-principles calculations

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Quasi-solid electrolytes based on ZIF-8 to improve the electrochemical properties of lithium-ion batteries across a wide temperature range

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INTERNATIONAL JOURNAL OF eleCTROCHEMICAL SCIENCE 2024年第5期19卷

作者： Gao, Shuai Long, Hongkun Liu, Weigang Zhang, Zhi Qiu, Shengqiang Yi, Maoyi Li, Jie Cent South Univ Sch Met & Environm Changsha 410083 Peoples R China Hunan Univ Arts & Sci Coll Chem & Mat Engn Hunan Prov Key Lab Water Treatment Funct Mat Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China Guangdong Mic Power New Energy Co Ltd Huizhou 516000 Peoples R China

Poor safety of liquid electrolytes and low ionic conductivity of solid electrolytes under room temperature are two major constraints for high energy density, long-term stability and safety of lithium-ion batteries (LIBs). In order to remedy the deficiencies, a quasi-solid electrolyte (QSE) is developed by immobilizing liquid electrolyte into the host of porous 2-Methylimidazole zinc salt (ZIF-8), and then mixing them with solid polymer electrolyte solvent of polyoxyethylene (PEO). The QSE has an ionic conductivity of 0.44 mS cm-1 at 20 degrees C and 2.27 mS cm-1 at 50 degrees C. The assembled LiFePO4/QSE/Li batteries exhibit excellent electrochemical performance in a wide temperature range. A reversible capacity of 129.7 mAh g-1 at 0.5 C and 20 degrees C and high capacity retentation of 94.7% at 0.5 C and 50 degrees C are achieved after 100 cycles. Especially, the LiFePO4/QSE/graphite pouch full cell exhibits a capacity retention of 97.7% at 0.5 C and 25 degrees C. These results indicate that QSE is a suitable candidate for enhancing the electrochemical performance of LIBs.

关键词： ZIF-8 Quasi -solid electrolyte PEO Lithium -ion battery Energy storage and conversion Nanocomposites

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Broadband nonlinear optical response of titanium nitride in the visible spectral range

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OPTICAL MATERIALS 2023年第1期136卷

作者： Huang, Jing Li, Jianqi Xiao, Yunchang Li, Jianying Hunan Univ Arts & Sci Key Lab Hunan Prov Control Technol Distributed Ele Schoool Comp & Elect Engn Changde 415000 Peoples R China

Epsilon-near-zero (ENZ) materials, a new class of materials with vanishing permittivity, which can significantly enhance the interaction between incident light and matters. Here, we investigated the third-order nonlinear optical response of titanium nitride (TiN), an ENZ material, in the visible range by using Z-scan method, and obtained a maximum nonlinear absorption coefficient beta of-3.78 x 103 cm/GW at its ENZ wavelength. Furthermore, the carriers dynamic characteristics of TiN are revealed by time-resolved pump-probe measure-ment, including the intraband and interband excitation, the former is mainly derived from laser-induced to form a non-equilibrium distribution of hot electrons, resulting in the electron energy redistribution process in the conduction band, and the latter is the electrons located in the valence band being promoted to the conduction band, increasing the total free carrier density and thus causing a change in the optical properties. Our results indicate the great potential applications of TiN in nonlinear optical and all-optical modulation devices.

关键词： Titanium nitride Optical nonlinearity Z -scan Pump -probe technique

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Feedback control strategy for state-of-charge balancing and power sharing between distributed battery energy storage units in DC microgrid

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IET POWER eleCTRONICS 2023年第6期16卷 1063-1076页

作者： Ding, Xiao Wang, Wen Zhou, Meina Yue, Yufei Chen, Qinze Zhang, Chaofeng Tang, Xin Li, Jianqi Changsha Univ Sci & Technol Sch Elect & Informat Engn Changsha Peoples R China Hunan Prov Key Lab Control Technol Distributed Ele Changde Peoples R China State Grid Heilongjiang Harbin Elect Power Co Harbin Peoples R China Hunan Univ Arts & Sci Sch Comp & Elect Engn Changde Peoples R China Changsha Univ Sci &Technol Sch Elect & Informat Engn Changsha 410114 Peoples R China

Different line resistances between battery energy storage systems (BESSs) and the bus cause the problem of state-of-charge (SOC) unbalance between the batteries. SOC unbalance brings about battery over-charge or over-discharge, which reduces the battery life. This paper proposes an SOC feedback control strategy to achieve both output power sharing and SOC equalization between the BESSs. The average SOC of the batteries is set as the reference of each SOC control loop, and the control objectives are achieved by regulating the output voltage of the energy storage converters. The state space model of the proposed control method is established for stability analysis and control parameter design. The parameters are then designed in detail according to the dynamic and steady-state performance. Simulation and experiment verified that the proposed control strategy can achieve accurate SOC equalization and output power sharing when the line resistances and the battery capacities are different.

关键词： DC-DC power convertors energy storage

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Reading Recognition Method of Mechanical Water Meter Based on Convolutional Neural Network in Natural Scenes

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JOURNAL OF ADVANCED COMPUTATIONAL INTELLIGENCE AND INTELLIGENT INFORMATICS 2024年第1期28卷 206-215页

作者： Li, Jiangi Shen, Jinfei Nie, Keheng Du, Rui Zhu, Jiang Long, Hongyu Hunan Univ Arts & Sci Dept Commun & Elect Engn 3150 Dongting Rd Changde 415000 Hunan Peoples R China Hunan Prov Key Lab Control Technol Distributed Ele 3150 Dongting Rd Changde 415000 Hunan Peoples R China Jishou Univ Coll Informat Sci & Engn 120 South Renmin Rd Jishou 416000 Hunan Peoples R China Hunan Acad Bldg Res Co Ltd 7 Wenchuang Rd Changsha 410014 Hunan Peoples R China

To satisfy the demand for real-time and high-precision recognition of mechanical water meter readings in natural scenes, a reading recognition method for mechanical water meters based on you only look once version 4 (YOLOv4) is proposed in this paper. First, a focus structure is introduced into the feature extraction network to expand the receptive field and reduce the loss of original information. Second, a ghost block cross stage partial module is constructed to improve the feature fusion of the network and enhance the feature representation. Finally, the loss function of YOLOv4 is improved to further enhance the detection accuracy of the network. Experimental results show that the mAP@O.5 and mAP@O.5:.95 of the proposed method are 97.9% and 77.3%, respectively, which are 1.6% and 6.0% higher, respectively, than those of YOLOv4. Additionally, the number of parameters and computation amount of the proposed method are 48.6% and 36.8% lower, respectively, whereas its inference speed is 27% higher. The proposed method is applied to assist meter reading, which significantly reduces the workload of onsite meter-reading personnel and improves work efficiency.

关键词： water meter reading convolution neural network automatic meter reading object detection

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Ion-confinement effect for zinc anode of aqueous zinc ion batteries

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JOURNAL OF ENERGY STORAGE 2023年 73卷

作者： Zhang, Xiangyang Shen, Qianyun Lin, Xinyi Luo, Chucheng Shen, Youming Huang, Xiaobing Hunan Univ Arts & Sci Coll Chem & Mat Engn Changde 415000 Peoples R China Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China

Aqueous zinc ion batteries are anticipated to succeed lithium-ion batteries as the upcoming generation of eco-friendly energy storage systems due to their high safety profile and environmental friendliness. Nevertheless, the development of aqueous zinc ion batteries has been impeded by obstacles such as Zn dendrites, hydrogen evolution reaction, corrosion, and passivation of the Zn anode. Researchers have used various strategies to address the problems faced by Zn anodes, including the construction of artificial interface protection layers, development of functional separators, optimisation of electrolyte additives, and zinc alloying. Among them, an idea called ion-confinement effect can be easily extracted from them. With the ion-confinement effect, the passage of zinc ions through the specific structure of the material can be regulated, resulting in uniform zinc ion flux and a dendrite-free anode. This review systematically summarises the application of ion-confinement effect in the construction of artificial interface coatings and functional separators, and then discusses in detail the mechanism of ion-confinement effect in various materials, including carbon materials, inorganic materials, 3-dimensional framework materials, biomass-based materials and polymers. Finally, an outlook on the development of ion-confinement interaction is given.

关键词： Aqueous zinc ion battery Ion-confinement Zn anode Coating Functional separator

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Micro-Grid Day-Ahead Stochastic Optimal Dispatch Considering Multiple Demand Response and electric Vehicles

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ENERGIES 2023年第8期16卷 3356页

作者： Li, Jianying Yang, Minsheng Zhang, Yuexing Li, Jianqi Lu, Jianquan Hunan Univ Arts & Sci Sch Comp & Elect Engn Changde 415000 Peoples R China Key Lab Hunan Prov Control Technol Distributed Ele Changde 415000 Peoples R China

Multiple demand responses and electric vehicles are considered, and a micro-grid day-ahead dispatch optimization model with photovoltaic is constructed based on stochastic optimization theory. Firstly, an interruptible load model based on incentive-based demand response is introduced, and a demand response mechanism for air conditioning load is constructed to implement an optimal energy consumption curve control strategy for air conditioning units. Secondly, considering the travel demand and charging/discharging rules of electric vehicles, the electric vehicle optimization model is built. Further, a stochastic optimization model of micro-grid with demand response and electric vehicles is developed because of the uncertainty of photovoltaic power output. Finally, the simulation example verifies the effectiveness of the proposed model. The simulation results show that the proposed model can effectively tackle the uncertainty of photovoltaic, as well as reduce the operating cost of micro-grid. Therefore, the effective interaction between users and electric vehicles can be realized.

关键词： demand responses electric vehicles photovoltaic micro-grid uncertainty

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Finite time adaptive resilient control method for distributed energy storage systems considering disturbance effects

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INTERNATIONAL JOURNAL OF eleCTRICAL POWER & ENERGY SYSTEMS 2024年 162卷

作者： Sun, Jian Li, Zewen Li, Jianqi Lu, Jianquan Changsha Univ Sci & Technol Sch Elect & Informat Engn Changsha 410000 Peoples R China Hunan Univ Arts & Sci Hunan Prov Key Lab Control Technol Distributed Ele Changde 415000 Peoples R China

The large-scale application of measurement devices, programmable controllers, and power electronic devices increases the likelihood of distributed energy storage systems suffering from various disturbances, thus affecting the stable operation of the system. In this paper, an adaptive finite time fast resilient control strategy is proposed for the unknown transmission disturbance in the control channel of distributed energy storage system. Firstly, the adverse effects of sensor and actuator disturbances on conventional consensus-based secondary control strategies are quantitatively analyzed. Secondly, an resilient control protocol with adaptive compensation mechanism based on terminal sliding mode is proposed, and the suppression mechanism of the controller to the unknown disturbance of the sensor and the actuator is analyzed, and the finite time convergence of the proposed distributed resilient secondary control strategy is proved theoretically. Experimental results show that the proposed control strategy is correct and effective.

关键词： distributed energy storage systems distributed secondary control Resilient control Terminal sliding mode Unknown disturbance

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