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High-performance localized high-concentration electrolytes by diluent design for long-cycling lithium metal batteries

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Chinese Chemical Letters 2024年第4期35卷 244-247页

作者： Zhe Wang li-peng hou Qian-Kui Zhang Nan Yao Aibing Chen Jia-Qi Huang Xue-Qiang Zhang College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

Electrolyte design is essential for stabilizing lithium metal anodes and localized high-concentration electrolyte(LHCE) is a promising one. However, the state-of-the-art LHCE remains insufficient to ensure long-cycling lithium metal anodes. Herein, regulating the solvation structure of lithium ions in LHCE by weakening the solvating power of diluents is proposed for improving LHCE performance. A diluent,1,1,2,2,3,3,4,4-octafluoro-5-(1,1,2,2-tetrafluoroethoxy) pentane(OFE), with weaker solvating power is introduced to increase the proportion of aggregates(an anion interacts with more than two lithium ions,AGG-n) in electrolyte compared with the commonly used 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether(TTE). The decomposition of AGG-n in OFE-based LHCE intensifies the formation of anion-derived solid electrolyte interphase and improves the uniformity of lithium deposition. lithium metal batteries with OFE-based LHCE deliver a superior lifespan of 190 cycles compared with 90 cycles of TTE-based LHCE under demanding conditions. Furthermore, a pouch cell with OFE-based LHCE delivers a specific energy of 417 Wh/kg and undergoes 49 cycles. This work provides guidance for designing high-performance electrolytes for lithium metal batteries.

关键词： lithium metal anodes Electrolyte Diluents Solid electrolyte interphase Pouch cells

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The formation of crystalline lithium sulfide on electrocatalytic surfaces in lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第1期31卷 568-573,I0015页

作者： Yun-Wei Song Jin-Lei Qin Chang-Xin Zhao Meng Zhao li-peng hou Yan-Qi peng Hong-Jie peng Bo-Quan li Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 611731China

lithium-sulfur(li-S)battery is highly regarded as a promising next-generation energy storage device but suffers from sluggish sulfur redox *** the behavior and mechanism of the sulfur species on electrocatalytic surface is the first step to rationally introduce polysulfide electrocatalysts for kinetic promotion in a working ***,crystalline lithium sulfide(li_(2)S)is exclusively observed on electrocatalytic surface with uniform spherical morphology while li_(2)S on non-electrocatalytic surface is amorphous and *** characterization indicates the crystalline li_(2)S preferentially participates in the discharge/charge process to render reduced interfacial resistance,high sulfur utilization,and activated sulfur redox ***,crystalline li_(2)S is proposed with thermodynamic and kinetic advantages to rati on alize the superior performances of li-S *** evoluti on of solid li_(2)S on electrocatalytic surface not only addresses the polysulfide electrocatalysis strategy,but also inspires further investigation into the chemistry of energy-related processes.

关键词： lithium-sulfur batteries Polysulfide electrocatalysis lithium sulfide Framework porphyrin Sulfur redox reactions

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High-valence sulfur-containing species in solid electrolyte interphase stabilizes lithium metal anodes in lithium–sulfur batteries

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Journal of Energy Chemistry 2022年第5期31卷 300-305页

作者： li-peng hou li-Yang Yao Chen-Xi Bi Jin Xie Bo-Quan li Jia-Qi Huang Xue-Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

The interfacial stability of lithium metal anodes dictated by solid electrolyte interphase(SEI) is essential for long-cycling high-energy-density lithium–sulfur batteries. Nevertheless, critical components of SEI for interfacial stabilization are particularly indistinct. Herein, the effect of various sulfur-containing components in SEI for stabilizing lithium metal anodes is disclosed in lithium–sulfur batteries. High-valence sulfur-containing species(li_(2)SO_(3) and li_(2)SO_(4)) in SEI are conducive to uniform lithium deposition and stabilizing lithium metal anodes. In contrast, low-valence sulfur-containing species(li_(2)S_(3) and li_(2)S_(4)) in SEI result in aggressive lithium dendrites and dead lithium. This work identifies the role of sulfurcontaining components in SEI for stabilizing lithium metal anodes and provides rational design principles of SEI for protecting lithium metal anodes in practical lithium–sulfur batteries.

关键词： lithium–sulfur batteries lithium anode Solid electrolyte interphase lithium plating Practical conditions

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Evaluation on a 400 Wh kg^(-1)lithium-sulfur pouch cell

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Journal of Energy Chemistry 2022年第3期31卷 24-29,I0002页

作者： Ge Ye Meng Zhao li-peng hou Wei-Jing Chen Xue-Qiang Zhang Bo-Quan li Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of lignocellulosic Chemistry Beijing Forestry UniversityBeijing 100083China

lithium–sulfur(li–S)batteries are highly regarded as next-generation energy storage devices due to their ultrahigh theoretical energy density of 2600 Wh kg^(−1).However,practical high-energy-density li–S pouch cells suffer from limited cycling lifespan with rapid loss of active ***,systematic evaluation on a 400 Wh kg^(−1)li–S pouch cell is carried out to reveal the working and failure mechanism of li–S batteries under practical *** morphology,spatial distribution and species analysis of sulfur,and capacity retention of electrodes are respectively evaluated after the first cycle of discharge or *** lithium polysulfides are found in electrolyte even at the end of discharge or charge,where the sulfur redox reactions are reversible with high capacity ***,severe morphology change is identified on lithium metal anode,yet there remains substantial active lithium to support the following *** work not only demonstrates unique behaviors of li–S batteries under practical conditions,which is essential for promoting the progress of li–S pouch cells,but also affords a systematic evaluation methodology to guide further investigation on high-energy-density li–S batteries.

关键词： lithium-sulfur batteries Pouch cell High energy density Failure analysis

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Constructing a 700 Wh kg^(-1)-level rechargeable lithium-sulfur pouch cell

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Journal of Energy Chemistry 2023年第1期76卷 181-186,I0005页

作者： Qian Cheng Zi-Xian Chen Xi-Yao li li-peng hou Chen-Xi Bi Xue-Qiang Zhang Jia-Qi Huang Bo-Quan li School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

lithium–sulfur(li–S)batteries are considered as highly promising energy storage devices because of their ultrahigh theoretical energy density of 2600 Wh kg^(-1).The highest practical energy density of li–S batteries reported at pouch cell level has exceeded 500 Wh kg^(-1),which significantly surpasses that of lithium-ion ***,a 700 Wh kg^(-1)-level li–S pouch cell is successfully *** pouch cell is designed at 6 Ah level with high-sulfur-loading cathodes of 7.4 mgScm^(-2),limited anode excess(50μm in thickness),and lean electrolyte(electrolyte to sulfur ratio of 1.7 gelectrolyteg^(-1)S).Accordingly,an ultrahigh specific capacity of 1563 m A h g^(-1)is achieved with the addition of a redox comediator to afford a practical energy density of 695 Wh kg^(-1)based on the total mass of all *** pouch cell can operate stably for three cycles and then failed due to rapidly increased polarization at the second discharge *** to failure analysis,electrolyte exhaustion is suggested as the key limiting *** work achieves a significant breakthrough in constructing high-energy-density li–S batteries and propels the development of li–S batteries toward practical working conditions.

关键词： lithium–sulfur batteries Pouch cell High energy density lithium polysulfides

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Protecting lithium metal anodes in lithium-sulfur batteries:A review

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Energy Material Advances 2023年第1期4卷 34-56页

作者： Chen-Xi Bi li-peng hou Zheng li Meng Zhao Xue-Qiang Zhang Bo-Quan li Qiang Zhang Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

lithium-sulfur(li-S)batteries are considered as one of the most promising next-generation energy storage devices because of their ultrahigh theoretical energy density beyond lithium-ion *** cycling stability of li metal anode largely determines the prospect of practical applications of li-S *** review systematically summarizes the current advances of li anode protection in li-S batteries regarding both fundamental understanding and regulation ***,the main challenges of li metal anode instability are introduced with emphasis on the influence from lithium ***,a timeline with 4 stages is presented to afford an overview of the developing history of this *** that,3 li anode protection strategies are discussed in detail in aspects of guiding uniform li plating/stripping,reducing polysulfide concentration in anolyte,and reducing polysulfide reaction activity with li ***,3 viewpoints are proposed to inspire future research and development of advanced li metal anode for practical li-S batteries.

关键词： field lithium sulfur

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Highly soluble organic nitrate additives for practical lithium metal batteries

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Carbon Energy 2023年第1期5卷 16-24页

作者： Zhe Wang li-peng hou Zheng li Jia-lin liang Ming-Yue Zhou Chen-Zi Zhao Xiaoyuan Zeng Bo-Quan li Aibing Chen Xue-Qiang Zhang peng Dong Yingjie Zhang Jia-Qi Huang Qiang Zhang Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingPR China College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuangPR China School of Materials Science and Engineering Beijing Institute of TechnologyBeijingPR China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijingPR China National and Local Joint Engineering Laboratory for lithium-Ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingPR China

The stability of lithium metal anodes essentially dictates the lifespan of high-energy-density lithium metal *** nitrate(liNO_(3))is widely recognized as an effective additive to stabilize lithium metal anodes by forming liN_(x)O_(y)-containing solid electrolyte interphase(SEI).However,its poor solubility in electrolytes,especially ester electrolytes,hinders its applications in lithium metal ***,an organic nitrate,isosorbide nitrate(ISDN),is proposed to replace liNO_(3).ISDNhas a high solubility of 3.3M in ester electrolytes due to the introduction of organic segments in the *** decomposition of ISDN generates liN_(x)O_(y)-rich SEI,enabling uniform lithium *** lifespan of lithium metal batteries with ISDN significantly increases from 80 to 155 cycles under demanding ***,a lithium metal pouch cell of 439Whkg^(−1) delivers 50 *** work opens a new avenue to develop additives by molecular modifications for practical lithium metal batteries.

关键词： electrolyte additives lithium metal anodes organic nitrate pouch cells solid electrolyte interphase

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Distribution and influencing factors of acoustic characteristics of seafloor sediment in the Sunda Shelf

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Journal of Oceanology and limnology 2024年第5期42卷 1486-1492页

作者： Zhengyu hou Danling TANG Jianguo liU Zhenglin li peng XIAO School of Ocean Engineering and Technology Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519000China Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University) Ministry of EducationZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)&South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 511458China

To understand the acoustic and physical properties of piston core samples collected from the Sunda continental shelf and analyze their distribution patterns,the samples were analyzed in laboratory,from which three provinces were divided in sound speed,sound speed ratio,porosity,wet bulk density,and maximum shear ***Ⅰhad lower sound speed and sound speed ratio(1.04),low porosity,and high wet bulk ***Ⅲhad the lowest sound speed and sound speed ratio(0.99),highest porosity(81%),and lowest wet bulk density(1.34 g/cm^(3)).The distribution pattern indicates that sediment movement,sediment source,topography,and hydrodynamic conditions influenced the distribution of acoustic and physical ***,we investigated the relationship of the maximum shear strength to the porosity and wet bulk density,and found that the maximum shear strength was proportional to both the porosity and wet bulk *** finding has significant implications for ocean engineering applications.

关键词： seafloor sediment acoustic property Sunda Shelf

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Terminal attitude selection method of missile attack aircraft

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Chinese Journal of Aeronautics 2024年第2期37卷 385-400页

作者： peng hou Yang PEI Yuxue GE Mengjie ZHU School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Research Department Shanghai Electro-Mechanical Engineering InstituteShanghai 201108China

The appropriate terminal attitude of missile is important to improve the damage effectiveness of fragmentation warhead against aircraft *** this paper,three missile terminal attitude selection methods are proposed to solve the problem of terminal attitude selection in different situations according to their respective evaluation *** MVE-based method uses the damage probability of each detonation point around the aircraft at a given attitude of missile to calculate the Mean Volume of Effectiveness(MVE)at the corresponding attitude,and then uses the MVE for different attitudes to select the terminal strike *** detonation position-based method addresses the case where the missile detonation position can be assessed in *** the effects of missile guidance errors and fuze activation position errors,Monte Carlo simulations are used to calculate the damage probability of aircraft with different strike attitudes,from which the terminal strike attitude is *** BP-ANN model-based method uses the constructed Back Propagation Artificial Neural Network(BP-ANN)model instead of simulation to calculate the evaluation indexes in the corresponding cases of MVE-based method and Detonation position-based method,which can improve the efficiency of attitude *** are conducted for different scenarios to verify the feasibility and effectiveness of the proposed method.

关键词： Aircraft vulnerability Attitude selection BP-ANN Damage probability Damage effectiveness

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Mechanical properties and microstructure of Mg-treated and Catreated industrial H13 steel after quenching and tempering

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Journal of Iron and Steel Research International 2024年第8期31卷 1987-2001页

作者： Jun-ying Yue Dong hou De-yong Wang Tian-peng Qu Xiang-long li Jun Tian School of Iron and Steel Soochow UniversitySuzhou 215021JiangsuChina

The effect of magnesium treatment and calcium treatment on the microstructure and mechanical properties of industrial H13 steel after quenching and tempering was *** impact toughness and tensile tests were mainly carried out,and the microstructure was observed by scanning electron microscopy,electron backscattered diffraction,and X-ray *** results show that magnesium treatment is still feasible in industrial *** is mainly manifested in the refinement of lath martensite and *** with calcium treatment,the prior austenite grains and carbides size of industrial H13 steel treated with magnesium decreased by 3.17μm after *** quenching and tempering,the carbides(especially V-rich carbides)in Mg treatment obviously spheroidized and distributed uniformly and increased in quantity *** lath martensite size is reduced from 2.45 to 2.31μ*** suggests that magnesium treatment was able to yield smaller grains and more evenly distributed ***,the impact toughness,yield strength,and ultimate tensile strength of industrial H13 steel with magnesium treatment increased by 28%,65.5 MPa and 123.7 MPa,*** increment of strength mainly comes from dislocation strengthening,grain refinement strengthening,and precipitation strengthening,among which precipitation strengthening accounts for the largest proportion.

关键词： Industrial H13 steel Mg treatment Heat treatment Carbide-Mechanical property

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