检索结果-南通市图书馆

Insights for understanding multiscale degradation of LiFePO_(4) cathodes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

eScience 2022年第2期2卷 125-137页

作者： Li Wang Jingyi Qiu Xiaodan Wang Long Chen Gaoping Cao Jianlong Wang Hao Zhang xiangming he Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China Research Institute of Chemical Defense Beijing100191China

Lithium-ion batteries(LIBs)based on olivine LiFePO_(4)(LFP)offer long cycle/calendar life and good safety,making them one of the dominant batteries in energy storage stations and electric vehicles,especially in *** scientists have a weak understanding of LFP cathode degradation,which restricts the further development of LFP materials and ***,we critically review reports on LFP cathode degradation with respect to different electric parameters(including C-rates,storage,and long cycling),mechanical stresses,and thermal *** detailed chemical and physical aspects of degradation mechanisms at various scales(i.e.,from atomic to devices)and their causes are comprehensively summarized,and discussions of related concerns are provided in each *** close with a systematic overview of LFP degradation research and mediation strategies,suggesting future directions for developing robust,safe LFP batteries with long cycle life.

关键词： Lithium-ion batteries LiFePO_(4)cathodes Multiscale degradation Multisource field Safety

Thermal Runaway Characteristics and Modeling of LiFePO4 Power Battery for Electric Vehicles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Automotive Innovation 2023年第3期6卷 414-424页

作者： Tao Sun Luyan Wang Dongsheng Ren Zhihe Shi Jie Chen Yuejiu Zheng Xuning Feng Xuebing Han Languang Lu Li Wang xiangming he Minggao Ouyang School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China

LiFePO_(4)(LFP)lithium-ion batteries have gained widespread use in electric vehicles due to their safety and longevity,but thermal runaway(TR)incidents still have been *** paper explores the TR characteristics and modeling of LFP batteries at different states of charge(SOC).Adiabatic tests reveal that TR severity increases with SOC,and five stages are identified based on battery temperature *** kinetics parameters of exothermic reactions in each TR stage are extracted,and TR models for LFP batteries are *** models accurately simulate TR behaviors at different SOCs,and the simulated TR characteristic temperatures also agree well with the experimental results,with errors of TR characteristic temperatures less than 3%.The prediction errors of TR characteristic temperatures under oven test conditions are also less than 1%.The results provide a comprehensive understanding of TR in LFP batteries,which is useful for battery safety design and optimization.

关键词： Lithium-ion battery Safety Thermal runaway Thermal runaway model State of charge

Molecular dynamics simulations of La_2O_3 thin films on SiO_2

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2014年第3期23卷 282-286页

作者： Mou Fang Stephen P.Kelty xiangming he Institute of Nuclear and New Energy Technology Tsinghua University State Key Laboratory of Automotive Safety and Energy Tsinghua University Huadong Institute of Lithium Ion Battery Department of Chemistry and Biochemistry Seton Hall University

Classical molecular dynamics is used to investigate the equilibrium state of the surface region and interface of heteroepitaxial La2O3 thin *** to the lattice mismatch,heteroepitaxial thin films are subject to very large *** this reason the behavior of La2O3 thin films at SiO2interface becomes an important *** result indicates that La2O3 can uniformly wet SiO2 *** properties of the simulated films are analyzed and the lack of any discernible crystalline phase in epitaxial La2O3 on SiO2 indicates that the lattice mismatch between SiO2 and La2O3 is sufficiently large to prevent the formation of even short-range orders in La2O3 film.

关键词： molecular dynamics simulation heteroepitaxia thin film interface lattice mismatch equilibrium state

Effect of silica nanoparticles/poly(vinylidene fluoride-hexafluoropropylene) coated layers on the performance of polypropylene separator for lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2014年第5期23卷 582-586页

作者： Hongyu Liu Zehui Dai Jun Xu Baohua Guo xiangming he Department of Chemical Engineering Tsinghua University Institute of Nuclear and New Energy Technology Tsinghua University

In an effort to reduce thermal shrinkage and improve electrochemical performance of porous polypropylene （PP） separators for lithium-ion batteries, a new composite separator is developed by introducing ceramic coated layers on both sides of PP separator through a dip-coating process. The coated layers are comprised of heat-resistant and hydrophilic silica nanoparticles and polyvinylidene fluoride-hexafluoropropylene （PVDF-HFP） binders. Highly porous honeycomb structure is formed and the thickness of the layer is only about 700 nm. In comparison to the pristine PP separator, the composite separator shows significant reduction in thermal shrinkage and improvement in liquid electrolyte uptake and ionic conduction, which play an important role in improving cell performance such as discharge capacity, C-rate capability, cycle performance and coulombic efficiency.

关键词： composite separator silica nanoparticles dip-coating thermal shrinkage cell performance

Advancing cell-based therapy in sepsis:An anesthesia outlook

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第13期137卷 1522-1534页

作者： Hui Ye Xiaoyu Zou xiangming Fang Department of Anesthesiology and Intensive Care The First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhouZhejiang 310003China The Children’s Hospital National Clinical Research Center for Child HealthSchool of MedicineZhejiang UniversityHangzhouZhejiang 312000China

Sepsis poses a health challenge globally owing to markedly high rates of morbidity and *** employing bundle therapy over two decades,approaches including transient organ supportive therapy and clinical trials focusing on signaling pathways have failed in effectively reversing multiple organ failure in patients with *** and appropriate perioperative management for surgical patients with concurrent sepsis is ***,innovative therapies focusing on remedying organ injuries are *** therapy has emerged as a promising therapeutic avenue for repairing local damage to vital organs and restoring homeostasis during perioperative treatment for *** the pivotal role of immune cell responses in the pathogenesis of sepsis,stem cell-based interventions that primarily modulate immune responses by interacting with multiple immune cells have progressed into clinical *** strides made in single-cell sequencing and gene-editing technologies have advanced the understanding of disease-specific immune responses in *** antigen receptor(CAR)-immune cell therapy offers an intriguing option for the treatment of *** review provides a concise overview of immune cell therapy,its current status,and the strides made in the context of sepsis research,discussing potential strategies for the management of patients with sepsis during perioperative stages.

关键词： Sepsis Perioperative Receptors,chimeric antigen Immunotherapy,adoptive Perfusion Tissue repair Multiple organ failure Shock,septic

Rational design of imine-linked three-dimensional mesoporous covalent organic frameworks with bor topology

在线全文

学校读者我要写书评

暂无评论

SusMat 2022年第2期2卷 197-205页

作者： Zonglong Li Chouhung Hsueh Zhuozhuo Tang Jia Chen Xiaolin Wang Hao Cui Yang Yang Xiaodan Wang Dongsheng Ren Hongqiang Gao Mingyang Li Hong Xu xiangming he Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijingChina

Three-dimensional(3D)covalent organic frameworks(COFs)possess great potential applications in various *** 3D COFs with large pore sizes is extremely challenging due to the interpenetration and ***,we report a series of crystalline imine-linked 3D COFs(3D-bor-COF-1,3D-borCOF-2,3D-bor-COF-3)with mesoporous channels through rationally designing the topology *** 3D-bor-COFs display permanent porosity and Brunauer–Emmett–Teller(BET)surfaces of 3205.5,1752.7,and 2077.3 m2 g−1(SLangmuir=4277.7,2480.3,and 2698.0 m2 g−1),*** pore sizes of 3Dbor-COFs were confirmed by the lattice fringes from high-resolution transmission electron microscopy,as well as structural simulation and nitrogen adsorption isotherm analysis.3D-bor-COFs display large pore sizes(3.8 nm for 3D-borCOF-3),which is among the highest record of 3D *** to the unstackedaromatic pore environment and high specific surface area,3D-bor-COFs display excellent adsorption capacity for benzene vapor(1203.9 mg g−1 for 3D-bor-COF-3)under 298 K,which is three times higher than that of the best-reported 2D *** work not only provides inspiration for designing 3D mesoporous imineCOFs,but also demonstrates a strategy for constructing aromatics adsorption materials.

关键词： benzene vapor uptake covalent organic framework large pore size lattice fringes topology configuration

Confining ultrafine Li3P nanoclusters in porous carbon for highperformance lithium-ion battery anode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第4期13卷 1122-1126页

作者： Eryang Mao Wenyu Wang Mintao Wan Li Wang xiangming he Yongming Sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

High-capacity lithium-containing alloy anodes(e.g.,Li4.4Si,Li4.4Sn,and Li3P)enable lithium-free cathodes(e.g.,Sulfur,V2O5,and FeF3)to produce next-generation lithium-ion batteries(LIBs)with high energy ***,we design a Li3P/C nanocomposite with Li3P ultrafine nanodomains embedded in micrometer-scale porous carbon *** from the unique micro/nanostructure of the Li3P/C nanocomposite,electrons transfer rapidly through the conductive pathway provided by the porous carbon framework and the volume change between Li3P and P is confined in the nanopores of the carbon,which avoids the collapse of the whole Li3P/C composite *** expected,the as-achieved Li3P/C nanocomposite provided a high available lithium-ion capacity of 791 mAh/g(calculated based on the mass of Li3P/C)at 0.1 C during the initial delithiation ***,the Li3P/C nanocomposite showed 75%of its 0.5 C capacity at 6 C and stable cycling stability.

关键词： Li3P nanoclusters porous carbon lithium-containing anode high capacity lithium-ion batteries

Boron-doped Ketjenblack based high performances cathode for rechargeable Li–O2 batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2016年第1期25卷 131-135页

作者： Yueyan Li Li Wang xiangming he Bin Tang Yunxue Jin Jianlong Wang Faculty of Materials Science and Engineering yiangsu University of Science and Technology Zhenjiang 212003 yiangsu China Institute of Nuclear &New Energy Technology Tsinghua University Beijing 100084 China Jiangsu Huadong Institute of Li-ion battery Zhangjiagang 215600 Jiangsu China

Boron-doped Ketjenblack is attempted as cathode catalyst for non-aqueous rechargeable Li–O2 batteries. The boron-doped Ketjenblack delivers an extremely high discharge capacity of 7193 m Ah/g at a current density of 0.1 m A/cm2, and the capacity is about 2.3 times as that of the pristine KB. When the batteries are cycled with different restricted capacity, the boron-doped Ketjenblack based cathodes exhibits higher discharge platform and longer cycle life than Ketjenblack based cathodes. Additionally, the boron-doped Ketjenblack also shows a superior electrocatalytic activity for oxygen reduction in 0.1 mol/L KOH aqueous solution. The improvement in catalytic activity results from the defects and activation sites introduced by boron doping.

关键词： Li–O2 battery Rechargeable Discharge capacity Boron-doped Ketjenblack Oxygen reduction

Internal short circuit detection method for battery pack based on circuit topology

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第10期61卷 1502-1511页

作者： ZHANG MingXuan DU JiuYu LIU LiShuo SIEGEL Jason LU LanGuang he xiangming OUYANG MingGao State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing 100084 China College of Engineering University of Michigan Ann Arbor MI 48109 USA Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Internal short circuit(ISCr) is one of the major obstacles to the improvement of the battery safety. The ISCr may lead to the battery thermal runaway and is hard to be detected in the early stage. In this work, a new ISCr detection method based on the symmetrical loop circuit topology(SLCT) is introduced. The SLCT ensures that every battery has the same priority in the circuit and every battery will contribute the same amount of short-circuit current to the ISCr once the ISCr happens. The ISCr battery could be identified by the combination of the ratio of the short-circuit currents and the sign of the short-circuit currents. The recursive least square method is adopted for the real-time application and the optimized ammeters allocation is derived from the mathematic deduction. The battery pack based on the individual DP(dual polarization) battery model is established to verify the ISCr detection method. The 1–1000 Ω s ISCr(the early stage ISCr) can be effectively detected within 1–125 s. The SLCT provides the possibility of new battery pack designs and new battery management methods. The proposed ISCr detection method shows excellent effectiveness and efficiency on the identification of the ISCr battery in the early stage.

关键词：电池模型内部短路拓扑学电路包装电流计数学推理电池管理