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Stress-Induced Uphill Diffusion with Interfacial Contact Loss in Solid-State Electrodes

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Acta Mechanica Solida Sinica 2022年第1期35卷 113-128页

作者： Yanfei Zhao Dingxin Shi bo lu Junqian Zhang lDepartment of Civil Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Department of Mechanics Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200444China

We simulate the mechanical-chemical coupling during delithiation and relaxation of a cathode in a solid-state lithium-ion *** loss at the interface between the active particle and the solid electrolyte is *** diffusion is observed during delithiation and *** phenomenon is explained by analyzing the total chemical potential and its two *** loss at the interface greatly influences the stress and stress gradient in the active *** delithiation continues,the stress and stress gradient grow considerably,and the mechanical part of the total chemical potential becomes dominant over the chemical part of *** the latter stage of delithiation,the influence of the incomplete interfacial constraint on the stress becomes dominant,while the effect of the concentration gradient becomes *** relaxation,the concentration and stress gradients increase in a particle with contact *** influence of the degree of contact loss on the mechanical-chemical coupling is *** overall tensile stress in the active particle increases with decreasing contact loss,causing a sharp decrease in local *** also check the effect of the elastic modulus of the solid electrolyte on the coupling of the active material.A rigid solid electrolyte with a higher elastic modulus more strongly restricts the active particle,leading to a higher tensile stress,a larger stress gradient,and a greater concentration gradient.

关键词： Solid electrolyte Contact loss Uphill diffusion Mechanical-chemical coupling Chemical potential Relaxation

Spectroscopic characterization and photochemistry of the Criegee intermediate CF_(3)C(H)OO

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Journal of Environmental Sciences 2022年第4期34卷 160-169页

作者： Lina Wang Zhuang Wu bo lu Xiaoqing Zeng Department of Chemistry Shanghai Key Laboratory of Molecular Catalysts and Innovative MaterialsFudan UniversityShanghai 200433China

Criegee intermediates(CIs),also known as carbonyl oxide,are reactive intermediates that play an important role in the atmospheric *** on the structures and reactivity of CIs is of fundamental importance in understanding the underlying mechanism of their atmospheric *** sharp contrast to the intensively studied parent molecule(CH_(2)OO)and the alkyl-substituted derivatives,the knowledge about the fluorinated analogue CF_(3)C(H)OO is *** carefully heating the triplet carbene CF_(3)CH in an O2-doped Ar-matrix to 35 K,the elusive carbonyl oxide CF_(3)C(H)OO in syn-and anti-conformations has been generated and characterized with infrared(IR)and ultraviolet-visible(UV-vis)*** spectroscopic identification is supported by^(18)O-labeling experiments and quantum chemical calculations at the B3 LYP/6-311++G(3df,3pd)and MP2/6-311++G(2d,2p)*** the long-wavelength irradiation(λ>680 nm),both conformers of CF_(3)C(H)OO decompose to give trifluoroacetaldehyde CF_(3)C(H)O and simultaneously rearrange to the isomeric dioxirane,cyclic-CF_(3)CH(OO),which undergoes isomerization to the lowest-energy carboxylic acid CF_(3)C(O)OH upon UV-light excitation at 365 *** O_(2)-oxidation of CF_(3)CH via the intermediacy of CF_(3)C(H)OO and cyclic-CF_(3)CH(OO)might provide new insight into the mechanism for the degradation of hydro-chlorofluorocarbon CF_(3)CHCl_(2)(HCFC-123)in the atmosphere.

关键词： Criegee intermediates CF_(3)COOH(TFA) CF_(3)CHCl_(2)(HCFC-123) Photochemistry Matrix-isolation spectroscopy

Recent advances in photofunctional polymorphs of molecular materials

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Chinese Chemical Letters 2019年第11期30卷 1908-1922页

作者： bo lu Shuya Liu Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal University

Recently,molecule-based luminescent materials have been drawing extensive attention due to their desirable properties and promising applications in the fields of sensors,lighting display and cell *** polymorph is an intriguing phenomenon that the presence of multiple packing and aggregate architectures of the same molecular *** studies on polymorphs for molecule-based fluorophores provide the opportunities to adjust the mode of molecular packing and photophysical properties,which will help to illustrate the structure-property *** this review,we focus on the recent progress in various feasible methods of molecule-based crystalline polymorphism growth and their adjustable photofunctional properties,which will open up possibilities of variant optical ***,several effective ways to prepare and screen polymorphs are sorted *** then,we discuss the discrepant properties and multifunctional applications(such as sensors,laser and OFET).Finally,the development trends and future prospects of these polymorphs are also briefly introduced.

关键词： Polymorphs Organic molecular materials luminescence Crystalline Preparation Optical applications Structure-property relationship

Enhanced production of glycyrrhetic acid 3-O-mono-β-D-glucuronide by fed-batch fermentation using p H and dissolved oxygen as feedback parameters

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Chinese Journal of Chemical Engineering 2016年第4期24卷 506-512页

作者： bo lu Xiaogang Yang Xudong Feng Chun Li School of Life Science Beijing Institute of Technology Beijing 100081 China

Glycyrrhetic acid 3-O-mono-β-D-glucuronide （GAMG）, the major functional ingredient in licorice, has widespread applications in food, pharmacy and cosmetics industry. The production of GAMG through Penicillium purpurogenum Li-3 cultivation was for the first time performed through both batch and fed-batch processes in bioreactors. In batch process, under optimal conditions （pH 5.0, temperature 32℃, agitation speed 100 r. rain 1）, 3.55 g. L^-1 GAMG was obtained in a 2.5 L fermentor. To further enhance GAMG production, a fine fed-batch process was developed by using pH and DO as feedback parameters. Starting from 48 h, 100 m190 g-L 1 substrate Glycyrrhizin （GL） was fed each time when pH increased to above 5.0 and DO was increased to above 80%. This strategy can significantly enhance GAMG production： the achieved GL conversion was 95.34% with GAMG yield of 95.15%, and GAMG concentration was 16.62 g. L^-1 which was 5 times higher than that of batch. Then, a two-step separation strat- egy was established to separate GAMG from fermentation broth by crude extraction of 15 ml column packed with D10I resin followed by fine purification with preparative C18 chromatography. The obtained GAMG purity was 95.79%. This study provides a new insight into the industrial bioprocess of high-level GAMG production.

关键词： Glycyrrhetic acid 3-O-mono-β -D-glucuronideFed-batch fermentationPenicillium purpurogenum Li-3D1 O1 resin separation

Effects of stress dependent electrochemical reaction on voltage hysteresis of lithium ion batteries

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Applied Mathematics and Mechanics(English Edition) 2018年第10期39卷 1453-1464页

作者： Haoliang LI Yicheng SONG bo lu Junqian ZHANG Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Department of Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University

Intercalation of lithium ions into the electrodes of lithium ion batteries is affected by the stress of active materials, leading to energy dissipation and stress dependent voltage hysteresis. A reaction-diffusion-stress coupling model is established to investigate the stress effects under galvanostatic and potentiostatic operations. It is found from simulations that the stress hysteresis contributes to the voltage hysteresis and leads to the energy dissipation. In addition, the stress induced voltage hysteresis is small in low rate galvanostatic operations but extraordinarily significant in high rate cases. In potentiostatic operations, the stresses and stress induced overpotentials increase to a peak value very soon after the operation commences and decays all the left time. Therefore,a combined charge-discharge operation is suggested, i.e., first the galvanostatic one and then the potentiostatic one. This combined operation can not only avoid the extreme stress during operations so as to prevent electrodes from failure but also reduce the voltage hysteresis and energy dissipation due to stress effects.

关键词： electrochemical reaction stress voltage hysteresis lithium ion battery

A modified pulse charging method for lithium-ion batteries by considering stress evolution,charging time and capacity utilization

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Frontiers of Structural and Civil Engineering 2019年第2期13卷 294-302页

作者： Yanfei ZHAO bo lu Yicheng SONG Junqian ZHANG Shanghai Institute of Applied Mathematics and Mechanics Shanghai UniversityShanghai 200072China Department of Civil Engineering Shanghai UniversityShanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200072China Department of Mechanics Shanghai UniversityShanghai 200444China

The stress evolution, total charging time and capacity utilization of pulse charging (PC) method are investigated in this pape匚 It is found that compared to the conventional constant current (CC) charging method, the PC method can accelerate the charging process but will inevitably cause an increase in stress and a decrease in capacity. The charging speed for PC method can be estimated by the mean current. By introducing stress control, a modified PC method called the PCCC method, which starts with a PC operation followed by a CC operation, is proposed. The PCCC method not only can accelerate charging process but also can avoid the stress raising and capacity loss occurring in the PC method. Furthermore, the optimal pulsed current density and switch time in the PCCC method is also discussed.

关键词： fast charging method pulse charging stress evolution charging time capacity utilization

Experimental and analytical studies on the deformability of a precast RC shear wall involving bolted connections

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Science China(Technological Sciences) 2015年第8期58卷 1439-1448页

作者： SUN Jian QIU HongXing YANG Yuan lu bo Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education Southeast University Suzhou Institute of Architectural Design Co.Ltd.

To study the deformability and ductility of an innovative precast shear wall joined by bolted connections,experimental tests were conducted on two test walls under monotonic and cyclic loading,respectively;subsequently,theoretical analysis was performed on the deformation performance of the shear wall *** test results confirmed the favorable deformability and ductility of the *** top displacement of the shear wall assembly was analytically decomposed into several constituent parts,the theoretical formulae of which were subsequently *** compositional analysis demonstrated that the top displacement of the test wall was primarily induced by the elastic deformation of the upper wall panel(UWP),the relative slippages within the bolted connections,and the flexural deformation within the plastic region of the UWP,while the constituent part contributed by the deformation in the connecting steel frame can be neglected.

关键词： precast shear wall bolted connections deformability analytical formulae

Another Gorenstein Analogue of Projective Complexes

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Wuhan University Journal of Natural Sciences 2020年第6期25卷 477-482页

作者： lu bo LIU Yifu College of Mathematics and Computer Science Northwest Minzu UniversityLanzhou 730030Gansu

As we know,a complex P is projective if and only if P is exact with Z_n(P)projective in R-Mod for each n∈Z and any morphism f:P→C is null homotopic for any complex *** this article,we study the notion of DG-Gorenstein projective *** show that a complex G is DG-Gorenstein projective if and only if G is exact with Z_n(G)Gorenstein projective in R-Mod for each n∈Z and any morphism f:G→Q is null homotopic whenever Q is a DG-projective complex.

关键词： Gorenstein projective module DG-projective complex DG-Gorenstein projective complex

An Early Warning System for Heatwave-Induced Health Risks in China:A Sub-Seasonal to Seasonal Perspective-China,2022

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China CDC weekly 2023年第29期5卷 647-650页

作者： Baichao Zhang Huiqi Chen bo lu National Climate Center China Meteorological AdministrationBeijingChina Sun Yat-Sen University Guangzhou CityGuangdong ProvinceChina

Summary What is already known about this topic?Climate change has had a detrimental impact on global health,particularly through the rise of extreme ***,the early warning system for heatwave-related health risks can forecast potential dangers several days in advance;however,long-term warnings fall *** is added by this report?This report introduces a novel early warning system aimed at predicting heatwave-induced health risks in China at sub-seasonal to seasonal *** outcomes of the assessment suggest this system holds significant *** are the implications for public health practices?The system facilitates advanced assessment of both the scale and dispersal of risk among various demographic *** allows for the proactive management of potential risks with extended lead times.

关键词： Seasonal wave extreme