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In-situ study of damage mechanisms in Mg-6li dual-phase alloy

Journal of Materials Science & Technology 2024年第12期179卷 114-124页

作者： Jing li li Jin Sangbong Yi Xin Zhang Jie Dong Ming Luo Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi'an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi'an 710072China National Engineering Research Center of light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute of Materials and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany

Interfaces play a crucial role in influencing the mechanical properties of Mg *** Mg-li dual-phase alloy,the type of interfaces is complex,which includes both grain boundary and phase boundary,and the influence of such interfaces on the damage nucleation is yet to be *** this paper,in-situ scanning electron microscopy(SEM)based measurements were carried out to investigate the meso-scale damage nucleation mechanisms of the Mg-6li dual-phase *** show that 94.8%of cracks are nucleated at the α-Mg grain boundary in the post-uniform elongation stage,while 5.2%are at phase boundary and almost no crack at the β-li grain *** initiation of α-Mg grain boundary cracks is attributed to strain incompatibility,which induces micro-strain localization,and then causes grain boundary sliding(GBS)and crack *** compatibility analysis reveals that the geometric compatibility factor(Mk)can be used to predict the nucleation of α-Mg grain boundary *** Mk is lower than 0.075,α-Mg grain boundary cracks tend to *** cracks are generated at the phase boundary is due to the mild strain partitioning between α-Mg phase and β-li phase and may also be partly attributed to multiple slip systems in body-centered cubic(BCC)-structured β-li phase,which can accommodate well with the deformation of adjacent α-Mg phase.

关键词： Crack nucleation Strain localization Grain boundary sliding Phase boundary Mg–6li dual-phase alloy

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Heat treatment effect on electrochemical properties of spinel li_4Ti_5O_(12)

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Rare Metals 2008年第2期27卷 165-169页

作者： li Yue ZHAO Hailei TIan Zhihong QIU Weihua li Xue School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

anode material li4Ti5O12 was prepared at 800℃ by a solid-state reaction, followed by heat-treatment at 600℃ for different times （0, 2, 8, and 12 h）. The effects of heat-treatment time on the particle morphology, rate-capability, and electrode kinetic process of the li4Ti5O12 electrode, and on the lithium ion diffusion coefficient inside the li4Ti5O12 electrode were investigated. Proper heat treatment could smoothen the particle surface of li4Ti5O12 particles and increase the rate-capability of the electrode. Overlong heat treatment might cause particle aggregation and hence result in a poor electrode kinetic process. A sample with 8 h of heat treatment showed the best rate-capability and the lowest electrode reaction resistance. Heat treatment for 2-8 h does not significantly change the lithium ion diffusion coefficient inside the li4Ti5O12 electrode, whereas, 12-h treatment results in a lower lithium ion diffusion coefficient.

关键词： lithium titanate heat treatment electrochemical property lithium ion battery

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Partial surface phase transformation of li_(3)VO_(4) that enables superior rate performance and fast lithium-ion storage

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Tungsten 2019年第4期1卷 276-286页

作者： Xiaoqing liu liping li Guangshe li State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

li_(3)VO_(4) is a promising electrode material for next-generation lithium-ion batteries(liBs)due to its excellent specific capac-ity(592 mAh g^(−1)),suitable discharge voltage(0.5-1.0 V),and moderate volume change upon charge/discharge,while it still suffers from low electronic conductivity that usually gives a poor rate capability,low initial coulombic efficiency,and large polarization,imposing a challenge on its practical *** this work,a partial surface phase transformation of li_(3)VO_(4) was initiated via a freeze-drying method followed by a heat treatment in inert *** this method,li_(3)VO_(4) was integrated with a conductive layer liVO_(2) and carbon *** synergistic effect among li_(3)VO_(4),liVO_(2) layer,and carbon matrix was systematically studied by optimizing the treatment *** treated at 600°C in Ar,li_(3)VO_(4)-based composite delivered outstanding electrochemical properties,as expressed by a specific capacity(689 mAh g^(−1) at 0.1 A g^(−1) after 100 cycles),rate performance(i.e.,448 mAh g^(−1) at 2 A g^(−1)),and longtime cycle stability(523 mAh g^(−1) after 200 cycles at 0.2 A g^(−1)),which are superior to those without liVO_(2) conductive layer when treated at the same temperature in *** findings reported in this work may offer novel hints of preparing more advanced anodes and promote the applications of vanadate materials such as li_(3)VO_(4) for next-generation lithium-ion batteries.

关键词： li_(3)VO_(4) liVO_(2) Rate performance Electronic conductivity li^(+)diffusion

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Determination of astrophysical ^7Be（p, γ）8B reaction rates from the ^7li（d, p）^8li reaction

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Science China(Physics,Mechanics & Astronomy) 2015年第6期58卷 74-80页

作者： DU XianChao GUO Bing li ZhiHong PanG DanYang li ErTao liU WeiPing China Institute of Atomic Energy School of Physics and Nuclear Energy Engineering Beihang University International Research Center for Nuclei and Particles in the Cosmos Beihang University College of Physics Science and Technology Shenzhen University

The ^7Be（p, γ）8B reaction plays a central role not only in the evaluation of solar neutrino fluxes but also in the evolution of the first stars. Study of this reaction requires the asymptotic normalization coefficient （anC） for the virtual decay ^8Bg.s. → ^7Be ＋ p. By using the charge symmetry relation, we obtain this proton anC with the single neutron anC of ^8lig.s.→^7li ＋ n, which is determined with the distorted wave Born approximation （DWBA） and adiabatic distorted wave approximation （ADWA） analysis of the ^7li（d, p）^8li angular distribution. The astrophysical S-factors and reaction rates of the direct capture process in the 7Be（p, y）SB reaction are further deduced at energies of astrophysical relevance. The astrophysical S-factor at zero energy for direct capture, S 17（0）, is derived to be （19.9 ± 3.5） eV b in good agreement with the most recent recommended value. The contributions of the 1 ^＋ and 3^＋ resonances to the S-factor and reaction rate are also evaluated. The present result demonstrates that the direct capture dominates the ^7Be（p, γ）8B reaction in the whole temperature range. This work provides an independent examination to the current results of the ^7Be（p, γ）8B reaction.

关键词： ^7li(d p)^8li Ed = 12 MeV DWBA analysis mirror system, ^7Be(p γ)8B astrophysical S-factors and reaction rates

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Processing maps and microstructural evolution of Al-Cu-li alloy during hot deformation

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Rare Metals 2019年第12期38卷 1136-1143页

作者： Sheng-li Yang Jian Shen Yong-an Zhang Zhi-Hui li Xi-Wu li Shu-Hui Huang Bai-Qing Xiong State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals

The hot deformation behavior of Al-Cu-li alloy was investigated by hot compression tests in the temperature range of 340-500℃ with strain rate of 0.001-10.000 s^(-1).Based on the dynamic materials model(DMM),processing maps of the test alloy were developed for optimizing hot processing *** optimum parameters of hot deformation for Al-Cu-li alloy are at temperature of 400-430℃and strain rate of about 0.100 s^(-1),with efficiency of power dissipation of around 30%.The microstructural manifestation of the alloy deformed in instability domains is flow localization,and dynamic softening first occurs in flow localizations *** stable domains,dynamic recovery(DRV) and dynamic recrystallization(DRX) are the main microstructural evolution *** is gradually strengthened with the increase in deformation temperature and the decrease in strain *** hot deformation,the DRX mechanism of Al-Cu-li alloy is dominated by continuous DRX(CDRX).A DRX model of Al-Cu-li alloy is proposed based on the microstructural evolution process of the test alloy.

关键词： Al-Cu-li alloy Processing map Dynamic recovery and dynamic recrystallization Microstructural evolution

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Towards Practical Application of li-S Battery with High Sulfur Loading and Lean Electrolyte:Will Carbon-Based Hosts Win This Race?

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Nano-Micro Letters 2023年第9期15卷 384-422页

作者： Yi Gong Jing li Kai Yang Shaoyin li Ming Xu Guangpeng Zhang Yan Shi Qiong Cai Huanxin li Yunlong Zhao Advanced Technology Institute University of SurreyGuildfordSurrey GU27XHUK Department of Chemical and Process Engineering University of SurreyGuildford GU27XHUK Department of Chemistry Physical and Theoretical Chemistry LaboratoryUniversity of OxfordOxford OX13QZUK Department of Engineering University of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanPeople’s Republic of China College of Materials and Metallurgy Guizhou UniversityGuiyang 550025People’s Republic of China

As the need for high-energy–density batteries continues to grow, lithium-sulfur(li–S) batteries have become a highly promising next-generation energy solution due to their low cost and exceptional energy density compared to commercially available li-ion batteries. Research into carbon-based sulfur hosts for li–S batteries has been ongoing for over two decades, leading to a significant number of publications and ***, the commercialization of li–S batteries has yet to be realized. This can be attributed, in part, to the instability of the li metal anode. However, even when considering just the cathode side, there is still no consensus on whether carbon-based hosts will prove to be the best sulfur hosts for the industrialization of li–S batteries. Recently, there has been controversy surrounding the use of carbon-based materials as the ideal sulfur hosts for practical applications of li–S batteries under high sulfur loading and lean electrolyte conditions. To address this question, it is important to review the results of research into carbon-based hosts, assess their strengths and weaknesses, and provide a clear perspective. This review systematically evaluates the merits and mechanisms of various strategies for developing carbon-based host materials for high sulfur loading and lean electrolyte conditions. The review covers structural design and functional optimization strategies in detail, providing a comprehensive understanding of the development of sulfur hosts. The review also describes the use of efficient machine learning methods for investigating li–S batteries. Finally, the outlook section lists and discusses current trends, challenges, and uncertainties surrounding carbon-based hosts, and concludes by presenting our standpoint and perspective on the subject.

关键词： li-S batteries Carbon materials Structural design Functional modification Machine learning

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SEI/dead li-turning capacity loss for high-performance anode-free solid-state lithium batteries

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Journal of Energy Chemistry 2024年第9期96卷 145-152页

作者： Qianwen Yin Tianyu li Hongzhang Zhang Guiming Zhong Xiaofei Yang Xianfeng li Division of Energy Storage Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Long-Duration and Large-Scale Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Laboratory of Advanced Spectro-Electrochemistry and lithium-Ion Batteries Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

anode-free solid-state lithium metal batteries(AF-SSLBs)have the potential to deliver higher energy density and improved safety beyond lithium-metal ***,the unclear mechanism for the fast capacity decay in AF-SSLBs,either determined by dead li or solid electrolyte interface(SEI),limits the proposal of effective strategies to prolong cycling *** clarify the underlying mechanism,herein,the evolution of SEI and dead li is quantitatively analyzed by a solid-state nuclear magnetic resonance(ss-NMR)technology in a typical liPF6-based polymer *** results show that the initial capacity loss is attributed to the formation of SEI,while the dead li dominates the following capacity loss and the growth rate is 0.141 mA h cm^(−2)cycle−*** reduce the active li loss,the combination of inorganic-rich SEI and self-healing electrostatic shield effect is proposed to improve the reversibility of li deposition/dissolution behavior,which reduces the capacity loss rate for the initial SEI and following dead li generation by 2.3 and 20.1 folds,*** a result,the initial Coulombic efficiency(ICE)and stable CE increase by 15.1%and 15.3%in li-Cu cells,which guides the rational design of high-performance AF-SSLBs.

关键词： Solid-state lithium batteries Solid-state NMR anode-free SEI Dead li

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Synthesis and characterization of li_4Ti_5O_(12) via a hydrolysis process from TiCl_4 aqueous solution

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Rare Metals 2014年第4期33卷 459-465页

作者： Xuan-Yu Wang Yun-Jiao li Cang Xu Long Kong lin li School of Metallurgical Science and Engineering Central South University

Spinel-type lithium and titanium composite oxide li4TisO12 was successfully synthesized via a novel hydrolysis method followed by calcination using titanium tetrachloride （TIC14） and lithium hydroxide （liOH.H2O） as raw materials. Three major factors, including liOH con- centration, liOH dosage, and hydrolysis temperature were studied for optimizing the synthetic conditions to obtain a phase-pure li4Ti5012. The physical and electrochemical properties of samples were characterized by X-ray dif- fraction （XRD）, thermogravimetric analysis （TGA）, fourier transform infrared spectroscopy （FT-IR）, scanning electron microscopy （SEM）, and constant current discharge-charge test. The FT-IR results indicate the presence of [TiO6] octahedra. The SEM images show that the li4Ti5O12 pre- cursor obtained is an amorphous solid with an irregular and rough morphology. It is revealed that the phase-pure spinel li4Ti5O12 powders with well crystallization and regular morphology can be obtained by calcining the precursor at 800 ℃ for 6 h. The constant current discharge-charge tests indicate that the li4TisO12 material delivers an excellent cycling ability, maintaining 93.8 % of its initial specific capacity after 60 cycles at a current density of 0.5C.

关键词： lithium ion battery Titanium tetrachloride li4Ti5O12 Synthesis Hydrolysis method

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Optimized CeO_(2) Nanowires with Rich Surface Oxygen Vacancies Enable Fast li-Ion Conduction in Composite Polymer Electrolytes

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Energy & Environmental Materials 2023年第1期6卷 218-223页

作者： Lu Gao Nan Wu Nanping Deng Zhenchao li Jianxin li Yong Che Bowen Cheng Weimin Kang Ruiping liu Yutao li State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes School of Textile Science and EngineeringTiangong UniversityTianjin 300387China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustin TX 78712USA Department of Materials of Science and Engineering China University of Mining and Technology(Beijing)Beijing 100083China Enpower Energy Corp. Beijing 102600China

Low-cost and flexible solid polymer electrolytes are promising in all-solid-state li-metal batteries with high energy density and ***,both the low room-temperature ionic conductivities and the small li^(+)transference number of these electrolytes significantly increase the internal resistance and overpotential of the ***,we introduce Gd-doped CeO_(2) nanowires with large surface area and rich surface oxygen vacancies to the polymer electrolyte to increase the interaction between Gd-doped CeO_(2) nanowires and polymer electrolytes,which promotes the li-salt dissociation and increases the concentration of mobile li ions in the composite polymer *** optimized composite polymer electrolyte has a high li-ion conductivity of 5×10^(-4)4 S cm^(-1) at 30℃ and a large li+transference number of ***,the composite polymer electrolytes have excellent compatibility with the metallic lithium anode and high-voltage liNi_(0.8)Mn _(0.1)Co_(0.1)O_(2)(NMC)cathode,providing the stable cycling of all-solid-state batteries at high current densities.

关键词： composite polymer electrolytes,Gd-doped CeO_(2)nanowires li-ion conduction oxygen vacancies surface interaction

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Highly improved cyclic stability of Ni-rich/li batteries with succinic anhydride as electrolyte additive and underlying mechanism

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Journal of Energy Chemistry 2023年第3期78卷 80-90,I0003页

作者： Shu Yang Guanjie li Xiaoyan lin Changyong Mo Xianggui Zhou lijiao Quan Kuan Zhou Suli li Hai Wang Weishan li School of Chemistry South China Normal UniversityGuangzhou 510006GuangdongChina Zhuhai CosMX Battery Co. LtdZhuhai 519180GuangdongChina National and Local Joint Engineering Research Center of MPTES in High Energy and Safety liBs Engineering Research Center of MTEES(Ministry of Education)and Key Lab.of ETESPG(GHEI)South China Normal UniversityGuangzhou 510006GuangdongChina

lithium-metal battery based on Ni-rich cathode provides high energy density but presents poor cyclic stability due to the unstable electrode/electrolyte interfaces on both cathode and *** this work,we report a new strategy to address this *** is found that the cyclic stability of Ni-rich/li battery can be significantly improved by using succinic anhydride(SA) as an electrolyte ***,the capacity retention of liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)/li cell is improved from 14% to 83% after 200cycles at 1 C between 3.0 and 4.35 V by applying 5% *** underlying mechanism of SA contribution is understood by comparing the effects of malic anhydride(MA) and citraconic anhydride(CA), both of which share a similar molecular structure to SA but show different *** anode side,SA can but MA and CA cannot form a protective solid electrolyte interphase(SEI) on li *** cathode side,three anhydrides can suppress the formation of hydrogen fluoride from electrolyte oxidation decomposition,but SA behaves ***,MA shows adverse effects on the interface stability of li anode and NCM811 cathode,which originates from its high *** the acidity of MA can be mitigated by substituting a methyl for one H atom at its C=C bond,the substituent CA cannot compete with SA in cyclic stability improvement of the cell,because the SEI resulting from CA is not as robust as that from SA,which is related to the binding energy of the SEI *** understanding reveals the importance of the electrolyte acidity on the Ni-rich cathode and the robustness of the SEI on li anode,which is helpful for rationally designing new electrolyte additives to further improve the cyclic stability of high-energydensity Ni-rich/li batteries.

关键词： lithium-metal battery Ni-rich cathode Electrolyte additives Succinic anhydride Cyclic stability

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