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Cyanoethyl cellulose-based eutectogel electrolyte enabling high-voltage-tolerant and ion-conductive solid-state lithium metal batteries

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Carbon Energy 2022年第6期4卷 1093-1106页

作者： Hao Zhang Lixue Zhou Xiaofan Du Jianjun Zhang Songwei Tian Tingting Liu Jinning Zhang Sijia Hu Weiling Song Xinhong Zhou Guanglei Cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoShandongPR China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdaoShandongPR China School of Chemical Engineering University of Chinese Academy of SciencesBeijingPR China

Solid-state polymer electrolytes are an important factor in the deployment of highsafety and high-energy-density solid-state lithium metal batteries.Nevertheless,use of the traditional polyethylene oxide-based solid-state polymer electrolyte is limited due to its inherently low ionic conductivity and narrow electrochemical stability window.Herein,for the first time,we specifically designed a cyanoethyl cellulosein-deep eutectic solvent composite eutectogel as a promising candidate for hybrid solid-state polymer electrolytes.It is found that the proposed eutectogel electrolyte achieves high ionic conductivity(1.87×10^(−3) S cm^(−1) at 25℃),superior electrochemical stability(up to 4.8 V),and outstanding lithium plating/striping behavior(low overpotential of 0.04 V at 1mAcm^(−2) and 1mAh cm^(−2) over 300 h).With the eutectogel-based solid-state polymer electrolyte,a 4.45 V LiCoO_(2)/Li metal battery delivers prominent long-term lifespan(capacity retention of 85%after 200 cycles)and high average Coulombic efficiency(99.5%)under ambient conditions,significantly outperforming the traditional carbonate-based liquid electrolyte.Our work demonstrates a promising strategy for designing eutectogel-based solid-state polymer electrolytes to realize high-voltage and high-energy lithium metal batteries.

关键词： cyanoethyl cellulose eutectogel high voltage solid-state lithium metal battery stable interfacial chemistry

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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 density.In 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 cathodes.We provide an overview of the ways to enhance high voltage resistance of PEO-based electrolytes.Those include components blend,molecular design and interface modification.With 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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MXene-based symmetric supercapacitors with high voltage and high energy density

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Materials Reports(Energy) 2022年第1期2卷 105-111页

作者： Wei Zheng Joseph Halim Per O.Å.Persson Johanna Rosen Michel W.Barsoum Department of Physics Chemistry and Biology(IFM)Linkoping University58183LinkopingSweden Department of Materials Science and Engineering Drexel University19104PhiladelphiaPAUSA

MXene-based aqueous symmetric supercapacitors(SSCs)are attractive due to their good rate performances and green nature.However,it remains a challenge to reach voltages much over 1.2 V,which significantly diminishes their energy density.Herein,we report on Mo_(1.33)CTz MXene-based SSCs possessing high voltages in a 19.5 M LiCl electrolyte.Benefiting from the vacancy-rich structure and high stable potential window of Mo_(1.33)CTz,the obtained SSCs deliver a maximum energy density of>38.2 mWh cm^(-3) at a power density of 196.6 mW cm^(-3) under an operating voltage of 1.4 V,along with excellent rate performance and impressive cycling stability.This highly concentrated LiCl electrolyte is also applicable to Ti_(3)C_(2)Tz,the most widely studied MXene,achieving a maximum energy density of>41.3 mWh cm^(-3) at a power density of 165.2 mW cm^(-3) with an operating voltage of 1.8 V.The drop in energy density with increasing power in the Ti_(3)C_(2)Tz cells was steeper than for the Mo-based cells.This work provides a roadmap to develop superior SSCs with high voltages and high energy densities.

关键词： MXene Symmetric supercapacitor high voltage high energy density highly concentrated electrolyte

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high-voltage Aqueous Zinc Batteries Achieved by Tri-functional Metallic Bipolar Electrodes

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Energy & Environmental Materials 2023年第1期6卷 360-367页

作者： Chang Liu Xiaowei Chi Cheng Yang Yu Liu Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

Aqueous rechargeable zinc batteries are very attractive for energy storage applications due to their low cost and high safety.However,low operating voltages limit their further development.For the first time,this work proposes a unique approach to increase the voltages of aqueous zinc batteries by using tri-functional metallic bipolar electrode with good electrochemical activity and ultrahigh electronic conductivity,which not only participates in redox reactions,but also functions as an electrical highway for charge transport.Furthermore,bipolar electrode can replace expensive ion selective membrane to separate electrolytes with different pH;thus,redox couples with higher potential in acid condition and Zn=Zn(OH)^(2-)_(4) couple with lower potential in alkaline condition can be employed together,leading to high voltages of aqueous zinc batteries.Herein,two types of metallic bipolar electrodes of Cu and Ag are utilized based on three kinds of aqueous zinc batteries:Zn–MnO_(2),Zn–I_(2),and Zn–Br_(2).The voltage of aqueous Zn–MnO_(2) battery is raised to 1.84 V by employing one Cu bipolar electrode,which shows no capacity attenuation after 3500 cycles.Moreover,the other Ag bipolar electrode can be adopted to successfully construct Zn–I_(2) and Zn–Br_(2) batteries exhibiting much higher voltages of 2.44 and 2.67 V,which also show no obvious capacity degradation for 1000 and 800 cycles,representing decent cycle stability.Since bipolar electrode can be applied in a large family of aqueous batteries,this work offers an elaborate high-voltage concept based on tri-functional metallic bipolar electrode as a model system to open a door to explore high-voltage aqueous batteries.

关键词： aqueous zinc battery high voltage metallic bipolar electrode

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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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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 investigated.The 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?·cm;from 1.01 m?·cm;.

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 LNMO.Herein,on the basis of energy level simulation,we present a high voltage resistant binder shielding strategy to address the challenging interfacial issue of LiNi0.5Mn1.5O4cathode.Our 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 compatibility.It is demonstrated that the dissolution of transition metal is significantly suppressed in the presence ofγ-PGFO binder,which excels in the literature.It is also noted that intramolecular hydrogen binding of the well-designed binder can generate powerful facial-contact binding,which is significant for a promising binder.By 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 counterpart.The 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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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 batteries.Thus,stabilizing the surfaces of LROs is the key to realize their practical application in high energy density Li-ion batteries.Surface coating is regarded as one of the most effective strategies for high voltage cathodes.The ideal coating materials should prevent cathodes from electrolyte corrosion and possess both electronic and Li-ionic conductivities simultaneously.However,commonly reported coating materials are unable to balance these functions well.Herein,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 V.In 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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Driving circuit with high accuracy and large driving capability for high voltage buck regulators

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Journal of Semiconductors 2014年第12期35卷 106-113页

作者：李亚军来新泉叶强袁冰 Institute of Electronic CAD Xidian University Key Laboratory of high-Speed Circuit Design and EMC Ministry of Education Xidian University

This paper presents a novel driving circuit for the high-side switch of high voltage buck regulators.A 40 V P-channel lateral double-diffused metal–oxide–semiconductor device whose drain–source and drain–gate can resist high voltage, but whose source–gate must be less than 5 V, is used as the high-side switch. The proposed driving circuit provides a stable and accurate 5 V driving voltage for protecting the high-side switch from breakdown and achieving low on-resistance and simple loop stability design. Furthermore, the driving circuit with excellent driving capability decreases the switching loss and dead time is also developed to reduce the shoot-through current loss. Therefore, power efficiency is greatly improved. An asynchronous buck regulator with the proposed technique has been successfully fabricated by a 0.35 μm CDMOS technology. From the results, compared with the accuracy of16.38% of the driving voltage in conventional design, a high accuracy of 1.38% is achieved in this work. Moreover,power efficiency is up to 95% at 12 V input and 5 V output.

关键词： high voltage buck regulator PLDMOS driving circuit dead time

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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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