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Sulfolane‑Based Flame‑Retardant Electrolyte for high‑voltage Sodium‑Ion Batteries

Nano-Micro Letters 2025年第2期17卷 498-516页

作者： Xuanlong He Jie Peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua Ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang Graphene Composite Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China GRINM(Guangdong)Research Institute for Advanced Materials and Technology FoshanGuangdong 528051People’s Republic of China College of Energy Engineering Zhejiang UniversityHangzhouZhejiang 310027People’s Republic of China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105People’s Republic of China Shenzhen Eigen-Equation Graphene Technology Co.Ltd Shenzhen 518000People’s Republic of China

Sodium-ion batteries hold great promise as next-generation energy storage ***,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of *** particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage ***,constructing dense and stable CEIs are crucial for high-performance *** work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous *** excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 *** addition,its nonflammable nature enhances the safety of *** work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关键词： Sodium-ion batteries Sulfolane-based electrolyte high voltage Layered oxide cathode Flame retardant

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Novel high voltage RESURF Al GaN/GaN HEMT with charged buffer layer

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Science China(Information Sciences) 2016年第4期59卷 142-151页

作者： Jiayun XIONG Chao YANG Jie WEI Junfeng WU Bo ZHANG Xiaorong LUO State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

A novel reduced surface field （RESURF） Al GaN /GaN high electron mobility transistor（HEMT）with charged buffer layer is proposed. Its breakdown mechanism and on-state characteristics are *** HEMT features buried Fluorine ions in the GaN buffer layer both under the Drift and the Gate region （FDG）. The section of FDG under the drift region （FD） not only reduces the electric field （E-field） peak at the gate edge but also enhances the E-field in the drift region by the assisted depletion, leading to a significant improvement in breakdown voltage （BV）. Moreover, the section of FDG under the gate （FG） enhances the back barrier and effectively prevents electron injecting from the source to form leakage current, thus a higher BV is achieved. The BV of the proposed HEMT sharply increases to 750 V from 230 V of conventional AlGaN /GaN HEMT with the same dimensional parameters, and the specific on-resistance （Ron,sp） just increases to1.21 m?·cm2from 1.01 m?·cm2.

关键词： high voltage power device AlGaN/GaN HEMT charged buffer RESURF

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Interfacial chemistry ofγ-glutamic acid-derived block polymer binder directing the interfacial compatibility of high voltage LiNi0.5Mn1.5O4 electrode

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Science China Chemistry 2021年第1期64卷 92-100页

作者： Yue Ma Chengdong Wang Jun Ma Gaojie Xu Zheng Chen Xiaofan Du Shu Zhang Xinhong Zhou Guanglei Cui Liquan Chen Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China College of Chemistry and Molecular Engineering Qingdao University of Science&TechnologyQingdao 266042China Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

LiNi0.5Mn1.5O4(LNMO)spinel is one of the most promising high voltage cathode candidates for lithium ion batteries(LIBs).However,owing to the instability for organic electrolytes at 5V high voltage,it exhibits continuous oxidation,leading to the formation of unstable interface and the notorious dissolution of transition metal,which prevents the successful commercialization of ***,on the basis of energy level simulation,we present a high voltage resistant binder shielding strategy to address the challenging interfacial issue of *** strategy is to design a novel poly(γ-glutamic acid)-c-1H,1H,9H,9H-perfluoro-1,9-nonanediol(γ-PGFO)binder with superior transition metal chelating effect and well-matched energy level to guarantee fantastic interfacial *** is demonstrated that the dissolution of transition metal is significantly suppressed in the presence ofγ-PGFO binder,which excels in the *** is also noted that intramolecular hydrogen binding of the well-designed binder can generate powerful facial-contact binding,which is significant for a promising *** encapsulating this binder inside the cathode matrix,the Li Ni0.5Mn1.5O4electrode exhibits a capacity of 105.8 m Ah g^(-1)after 500cycles at 1 C with a capacity retention of 88.2%,which is significantly superior to that of polyvinylidene fluoride(PVDF)/Li Ni0.5Mn1.5O4electrode(a capacity of 82.9 m Ah g^(-1)and a capacity retention of 63.4%).The overall Coulombic efficiency ofγ-PGFO/Li Ni0.5Mn1.5O4electrode is prominently improved to be 99.1%,compared with 95.5%of PVDF *** presented results demonstrate a promising strategy of amino acid-based binder with strong transition metal chelating capability for boosting the rapid development of high voltage lithium ion battery.

关键词： LiNi0.5Mn1.5O4 cathode amino acid binder high voltage interfacial regulation

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Boosting practical high voltage lithium metal batteries by butyronitrile in ether electrolytes via coordination, hydrolysis of C≡N and relatively mild concentration strategy

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Journal of Energy Chemistry 2022年第4期31卷 290-299页

作者： Jingrong Ning Kaijia Duan Kai Wang Jianwen Liu Shiquan Wang Jiujun Zhang College of Chemistry and Chemical Engineering&Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry&Ministry of Educational Key Laboratory for the Synthesis and Application of Organic Functional Molecules Hubei UniversityWuhanHubei 430062China Institute for Sustainable Energy/College of Science Shanghai UniversityShanghai 200444China

Currently ether solvents have been regarded as the most compatible organic solvents with lithium metal in electrolytes of lithium ***,ether solvents are unstable under high voltage (>4.0 V),and prone to side reactions with nickel-rich high-voltage cathode *** this work,a novel dual-solvent electrolyte in ethylene glycol dimethyl ether (DME) and butyronitrile (BN) mixed solvent was designed and fabricated for Li/Li Ni_(0.5)Mn_(0.3)Co_(0.2)O_(2)-based lithium metal *** charged to high voltage4.3 V,the battery cycled in this optimal electrolyte can maintain the capacity at 133.7 m Ah g^(-1) with a retention of 88.84%after 150 cycles at 0.2 C and-10℃.During long-term cycling,the battery also exhibits excellent cycling performance with capacity maintained at about 112.0 m Ah g^(-1) after 500 cycles at 1C and-10℃.BN has strong oxidation resistance and high conductivity,which can inhibit the decomposition of ether solvents under high voltage and improve the low temperature performance of battery ***,the cyano (–C≡N) group in BN molecular has a strong coordination ability with the high-valent metal ions and can mask the active ions on the cathode,correspondingly reducing the corrosion of cathode material by the ***,cyano group can participate in the hydrolysis to remove trace amounts of water and acidic by-products such as HF in the ***,the boosting effect of butyronitrile for ether solvents can provide a promising strategy for enhancing the performance of high voltage lithium metal batteries for practical industrialization.

关键词： Electrolytes Lithium metal batteries Ether solvents Butyronitrile high voltage

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Recent advances toward high voltage, EC-free electrolytes for graphite-based Li-ion battery

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 577-591页

作者： Tong Zhang Elie Paillard Helmholtz Institute Muenster- Forschungszentrum Juelich (IEK 12) Corrensstr. 46 48149 Muenster Germany

Lithium-ion batteries are a key technology in today＇s world and improving their performances requires, in many cases, the use of cathodes operating above the anodic stability of state-of-the-art electrolytes based on ethylene carbonate （EC） mixtures. EC, however, is a crucial component of electrolytes, due to its excellent ability to allow graphite anode operation-also required for high energy density batteries-by stabilizing the electrode/ electrolyte interface. In the last years, many alternative electrolytes, aiming at allowing high voltage battery operation, have been proposed. However, often, graphite electrode operation is not well demonstrated in these electrolytes. Thus, we review here the high voltage, EC- free alternative electrolytes, focusing on those allowing the steady operation of graphite anodes. This review covers electrolyte compositions, with the widespread use of additives, the change in main lithium salt, the effect of anion （or Li salt） concentration, but also reports on graphite protection strategies, by coatings or artificial solid electrolyte interphase （SEI） or by use of water-soluble binder for electrode processing as these can also enable the use of graphite in electrolytes with suboptimal intrinsic SEI formation ability.

关键词： lithium-ion electrolyte solid electrolyte interphase additives high voltage graphite

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Experimental study of pollution effect on the behavior of high voltage insulators under alternative current

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Frontiers in Energy 2021年第1期15卷 213-221页

作者： Hani BENGUESMIA Nassima M'ZIOU Ahmed BOUBAKEUR Laboratoire de Recherche(LI3CUB) Biskra UniversityBP145RP07000 BiskraAlegria Department of Electrical Engineering Faculty of TechnologyM’sila UniversityB.P.16628000 M’silaAlgeria Department of Electrical Engineering Faculty of engineer SciencesBoumerdes University35000 BoumerdesAlgeria Laboratoire de Recherche en Electrotechnique(L.R.E) Ecole Nationale Polytechnique16027 AlgiersAlgeria

In this paper, the impact of the conductivity and the distribution of pollution on the behavior of the high voltage insulator cap and pin 1512L, artificially polluted is described. An experimental model in form of a disc is proposed. This experimental model reproduces the real model which is the 1512L insulator. Besides, a comparative study is presented. For this comparative study, different solutions are adopted to s`imulate the pollution (containing NaCl + distilled water) that has different conductivities for a discontinuous distribution of the pollution on the insulator under an AC voltage. Furthermore, the influence of the pollution on the flashover voltage and the leakage current is studied. Finally, the behavior of real and experimental model of the insulator is investigated.

关键词： 1512L insulator circular model artificial pollution flashover leakage current discontinuous pollution high voltage

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Synthesis and electrochemical performance of La_(2)CuO_(4)as a promising coating material for high voltage Li-rich layered oxide cathodes

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Chinese Physics B 2023年第8期32卷 124-132页

作者：郭福亮卢嘉泽苏美华陈约郑杰允尹良李泓 Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Renewable EnergyBeijing Key Laboratory for New Energy Materials and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Tianmu Lake Institute of Advanced Energy Storage Technologies Liyang 213300China Yangtze River Delta Physics Research Center Liyang 213300China

The structural transformations,oxygen releasing and side reactions with electrolytes on the surface are considered as the main causes of the performance degradation of Li-rich layered oxides(LROs)cathodes in Li-ion ***,stabilizing the surfaces of LROs is the key to realize their practical application in high energy density Li-ion *** coating is regarded as one of the most effective strategies for high voltage *** ideal coating materials should prevent cathodes from electrolyte corrosion and possess both electronic and Li-ionic conductivities ***,commonly reported coating materials are unable to balance these functions ***,a new type of coating material,La_(2)CuO_(4)was introduced to mitigate the surface issues of LROs for the first time,due to its superb electronic conductivity(26-35 mS·cm^(-1))and lithium-ionic diffusion coefficient(10^(-12)-10^(-13)cm^(2)·s^(-1)).After coating with the La_(2)CuO_(4),the capacity retention of Li_(1.2)Ni_(0.54)Co_(0.13)Mn_(0.13)O_(2)cathode was increased to 85.9%(compared to 79.3%of uncoated cathode)after 150 cycles in the voltage range of 2.0-4.8 *** addition,only negligible degradations on the deliverable capacity and rate capability were observed.

关键词： La_(2)CuO_(4) electronic conductivity Li-ionic conductivity Li-rich layered oxides high voltage

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Electrochemical characterization of MnO_2 as the cathode material for a high voltage hybrid capacitor

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 576-580页

作者： Jian-ling Li Fei Gao Yan Jing Rui-ying Miao Ke-zhong Wu Xin-dong Wang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Department of Chemistry and Material Science Hebei Normal University Shijiazhuang 050016 China

Manganese dioxide （MnO2） was prepared using the ultrasonic method. Its electrochemical performance was evaluated as the cathode material for a high voltage hybrid capacitor. And the specific capacitance of the MnO2 electrode reached 240 F·g^-1. The new hybrid capacitor was constructed, combining A1/Al2O3 as the anode and MnO2 as the cathode with electrolyte for the aluminum electrolytic capacitor to solve the problem of low working voltage of a supercapacitor unit. The results showed that the hybrid capacitor had a high energy density and the ability of quick charging and discharging according to the electrochemical performance test. The capacitance was 84.4 μF, and the volume and mass energy densities were greatly improved compared to those of the traditional aluminum electrolytic capacitor of 47 μF. The analysis of electrochemical impedance spectroscopy （EIS） showed that the hybrid capacitor had good impedance characteristics.

关键词： manganese dioxide hybrid capacitor high voltage high energy density

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high voltage preparation, characterization, and optical properties of silver dendrites in PVA matrix

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Frontiers of Optoelectronics 2010年第2期3卷 205-210页

作者： Biao DONG Hongwei SONG Lianxiang YU Xue BAI Yu WANG Lin XU Jiansheng CHEN State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University College of Chemistry Jilin University

In this paper, we present a room-temperature synthesis of silver dendrites in a poly(vinyl alcohol)(PVA)-Ag composite system with the assistance of high voltage. In the silver dendrites, the nanounits are platelike,thus the surface plasmon absorption bands of silver dendrites are tuned from visible to ～800 nm, which is due to the template function of PVA and the assistance of high voltage. Scanning electron microscope(SEM), X-ray diffraction(XRD), and energy dispersive X-ray(EDX)data confirm that the structures are crystalline silver embedded in PVA. The absorption results indicate that the ratio of PVA and Ag do not influence the position but the intensity of the near-infrared(NIR) absorption. This material has potential use in the field of bio-application and infrared sensors.

关键词： silver dendrites poly(vinyl alcohol) PVA composite high voltage near-infrared (NIR) absorption

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Progress on high voltage PEO-based Polymer Solid Electrolytes in Lithium Batteries

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Chemical Research in Chinese Universities 2022年第3期38卷 735-743页

作者： HOU Wenhui OU Yu LIU Kai Department of Chemical Engineering Tsinghua UniversityBeijing100084P.R.China

Polymer electrolytes have attracted great interest for next-generation lithium-based batteries on account of safety and high energy *** this review,we assess recent progress on the design of poly(ethylene oxide)(PEO)-based solid polymer electrolytes in high voltage lithium batteries and identify possible side reactions between PEO-based electrolytes and existing *** provide an overview of the ways to enhance high voltage resistance of PEO-based *** include components blend,molecular design and interface *** these efforts,we want to present new insights into rational design of PEO-based electrolytes to develop solid-state lithium batteries for advanced performance.

关键词： Poly(ethylene oxide) Lithium battery high voltage Molecular design Interface modification

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