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Degradation mechanism of high-voltage single-crystal LiNi_(0.5)co.(0.2)Mn_(0.3)O_(2) cathode material

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Chinese Physics B 2023年第12期32卷 618-622页

作者：柳娜 contemporary amperex technology co. LimitedNingde 352000China

Layered cathode materials have been successfully co.mercialized and applied to electric *** further improve improve the energy density of these marterials is still the main efforts in the ***,developing high-voltage LiNi_(x)co.(y)Mn_(z)O_(2)(x+y+z=1,NCM)to achieve high energy density is particularly ***,under high voltage cycling,NCM often exhibits rapid capacity degradation,which can be attributed to oxygen release,structural phase transition and particle *** this work,the representative single-crystal LiNi_(0.5)co.(0.2)Mn_(0.3)O_(2)(NCM523)was studied under various high charge cut-off *** by x-ray diffraction(XRD),transmission electron microsco.e(TEM)and electron back scatter diffraction(EBSD)measurements indicated that the rock-salt phase is formed on the surface of the particles after high voltage cycling,which is responsible for the increase of impedance and the rapid decay of ***,inhibiting the formation of rock-salt phase is believed an effective strategy to address the failure of NCM under high *** findings provide effective guidance for the development of high-voltage NCM.

关键词： high voltage Li-ion battery phase transition LiNi_(x)co.(y)Mn_(z)O_(2)

Prelithiation Enhances Cycling Life of Lithium-Ion Batteries:A Mini Review

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Energy & Environmental Materials 2023年第6期6卷 1-9页

作者： Xiaomei Liu Ze Wu Leqiong Xie Li Sheng Jianhong Liu Li Wang Kai Wu Xiangming He Institute of Nuclear and New Energy technology Tsinghua UniversityBeijing 100084China contemporary amperex technology co. LimitedNinde 352100China

During the last decade,the rapid development of lithium-ion battery(LIB)energy storage systems has provided significant support for the efficient operation of renewable energy *** the co.ing years,the service life demand of energy storage systems will be further increased to 30 years from the current 20 years on the basis of the equivalent service life of renewable energy ***,the life of the present LIB is far from meeting such high ***,research on the next-generation LIB with ultra-long service life is *** technology has been widely studied as an important means to co.pensate for the initial co.lombic efficiency loss and improve the service life of *** review systematically summarized the different prelithiation methods from anode and cathode ***,the large-scale industrialization challenge and the possibility of the existing prelithiation technology are analyzed,based on three key parameters:industry co.patibility,prelithiation efficiency,and energy ***,the future trends of improvement in LIB performance by other overlithiated cathode materials are presented,which gives a reference for subsequent research.

关键词： cycle life lithium co.pensation lithium-ion battery prelithiation

The Stereoco.plex Crystallites Improve the Stability of Biodegradable Poly(L-lactic acid)/Poly(D-lactic acid)Melt-Blown Nonwovens

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Chinese Journal of Polymer Science 2025年第2期43卷 368-379页

作者： Jin-Shuo Yu Yue-Wei Huan Hong-Wei Pan Zhi-Gang Liu Yan Zhao Zhi-Yong Tan Jun-Jia Bian Hui-Li Yang Hui-Liang Zhang Key Laboratory of Polymer Eco.aterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China co.lege of Material and Engineering School of Chemical EngineeringEngineering Research Center of Synthetic Resin and Special FiberMinistry of EducationChangchun University of TechnologyChangchun130012China Shandong Fufeng Fermentation co. Ltd.Shandong276600China National Engineering Research Center of co.n Deep Processing Jilin COFCO Biochemistry Co.Ltd.Changchun130033China

Poly(lactic acid)(PLA)is a biodegradable and eco.friendly polymer that is increasingly being inco.porated into various applications in contemporary ***,the limited stability of PLA-based products remains a significant challenge for their broader use in various *** this study,poly(L-lactic acid)(PLLA)/poly(D-lactic acid)(PDLA)melt-blown nonwovens were prepared by melt *** structure,thermal properties,thermal stability,biodegradability and crystalline morphology of the melt-blown nonwovens were *** and WAXD co.firmed the formation of stereoco.plex(SC)crystallites in the PLLA *** storage modulus(G′),loss modulus(G″),and co.plex visco.ity(∣η^(*)∣)of the PLLA/PDLA blend increased with an increase in SC crystallite *** thermal degradation temperatures of PLLA/PDLA melt-blown nonwovens increased with the inco.poration of SC crystallites,and the maximum rate of deco.position increased to 385.5℃,thus enhancing the thermal *** with neat PLLA melt-blown nonwovens,the hydrophobicity of PLLA/PDLA melt-blown nonwovens was improved,and WCA increased to 139.7°.The SC crystallites were more resistant to degradation by proteinase K co.pared to neat ***,the degradation rate of PLLA/PDLA melt-blown nonwovens remained at a high *** work provides an effective strategy to obtain high-performance PLLA melt-blown nonwovens.

关键词： PLLA PDLA Melt-blown nonwovens Stereoco.plex crystallites Thermal stability Enzymatic degradation

Deco.ple charge transfer reactions in the Li-ion battery

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Journal of Energy Chemistry 2024年第5期92卷 759-798页

作者： Yuxuan Bai Qiu-An Huang Kai Wu Jiujun Zhang Institute for Sustainable Energy/co.lege of Sciences Shanghai UniversityShanghai 200444China Ningde contemporary Innovation Laboratory Contemporary Amperex Technology Co.LimitedNingde 352100FujianChina

In the development of Li-ion batteries(LIBs)with high energy/power density,long cycle-life,fast charging,and high safety,an insight into charge transfer reactions is *** electrochemical impedance spectrosco.y(EIS)is regarded as a powerful diagnosis tool,it is not a direct but an indirect *** respect to this,some critical questions need to be answered:(i)why EIS can reflect the kinetics of charge transfer reactions;(ii)what the inherent logical relationship between impedance models under different physical scenes is;(iii)how charge transfer reactions co.pete with each other at multiple *** work aims at answering these questions via developing a theory framework so as to mitigate the blindness and uncertainty in unveiling charge transfer reactions in *** systematically answer the above questions,this article is organized into a three-in-one(review,tutorial,and research)type and the following co.tributions are made:(i)a brief review is given for impedance model development of the LIBs over the past half century;(ii)an open source co.e toolbox is developed based on the unified impedance model;(iii)the co.petive mechanisms of charge transfer reactions are unveiled based on the developed EIS-Toolbox@*** work not only clarifies theoretical fundamentals,but also provides an easy-to-use open source co.e for EIS-Toolbox@LIB to optimize fast charge/discharge,mitigate cycle aging,and improve energy/power density.

关键词： Electrochemical impedance spectrosco.y Unified impedance model Charge transfer reactions Solid/electrolyte diffusion Porous electrode EIS-Toolbox@LIB

Ultra-stable K metal anode enabled by oxygen-rich carbon cloth

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Nano Research 2020年第11期13卷 3137-3141页

作者： Yangyang Xie Junxian Hu Zexun Han Hailin Fan Jingyu Xu Yanqing Lai Zhian Zhang School of Metallurgy and Environment Central South UniversityChangsha410083China contemporary amperex technology co. Ltd.Ningde352100China

The K metal batteries are emerged as promising alternatives beyond co.mercialized Li-ion ***,suppressing unco.trolled dendrite is crucial to the acco.plishment of K metal ***,an oxygen-rich treated carbon cloth(TCC)has been designed as the K plating host to guide K homogeneous nucleation and suppress the dendrite *** density function theory calculations and experimental results demonstrate that abundant oxygen functional groups as K-philic sites on TCC can guide K nucleation and deposition *** a result,the TCC electrode exhibits an ultra-long-life over 800 cycles at high current density of 3.0 mA·cm^(−2)for 3.0 mA·h·cm^(−2).Furthermore,the symmetrical cells can run stably for 2,000 h with low over-potential less than 20 mV at 1.0 mA·cm^(−2)for 1.0 mA·h·cm^(−2).Even at a higher current of 5.0 mA·cm^(−2),the TCC electrode can still stably cycle for 1,400 h.

关键词： K metal anode dendrite oxygen-rich treated carbon cloth K-philic sites ultra-long-life

DHA and EPA protect against co.nitive impairment induced by chronic sleep deprivation through regulating iron-mitophagy homeostasis

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Food Science and Human Wellness 2025年

作者： Lu Chen Yueqi Yang Ning Zhang Bin Sun Hongxia Che Zhengping Wang Jun Han Min Wen Institute of Biopharmaceutical Research， Liaocheng University co.lege of Marine Science and Biological Engineering， Qingdao University of Science and technology Pet Nutrition R research and Development Center Gambol Pet Group co.，Ltd.

The co.nitive impairments resulting from insufficient sleep have emerged as a significant public health co.cern in contemporary society， lacking effective treatments due to the absence of elucidation regarding its molecular mechanism. This study aimed to investigate the efficacy of doco.ahexaenoic acid (DHA) and eico.apentaenoic acid (EPA) against co.nitive deficits in a mouse model of chronic sleep deprivation (CSD)， and to elucidate the underlying mechanisms. CSD mice display significant co.nitive deficits in the Morris water maze task with obviously neuronal damage. We observed that dysregulation of iron transport proteins (IRP1， TfR1， DMT1， and FPN1) in CSD mice resulted in iron deposition in the co.tex. Subsequent assessment revealed upregulation of mitophagy and neuronal lipid peroxidation and downregulation of proteins in the mitochondrial respiratory chain co.plexes (I-V). Further molecular analysis revealed inhibition of the Sirt3-Nrf2 pathway and its downstream antioxidant molecules (e.g. GPX4， HO-1， SOD2， and NQO1). In co.trast， dietary supplementation with DHA or EPA alleviated CSD-induced co.nitive impairment by inhibiting neuronal ferroptosis through regulating iron-mitophagy homeostasis. Notably， EPA showed superior efficiency in ameliorating co.nitive impairment， potentially due to its stronger interaction with Sirt3 co.pared to DHA.

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Bending and wave propagation analysis of axially functionally graded beams based on a reformulated strain gradient elasticity theory

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Applied Mathematics and Mechanics(English Edition) 2023年第10期44卷 1803-1820页

作者： Shaopeng WANG Jun HONG Dao WEI Gongye ZHANG Jiangsu Key Laboratory of Engineering Mechanics School of Civil EngineeringSoutheast UniversityNanjing 210096China contemporary amperex technology co. Ltd.Ningde 352100Fujian ProvinceChina

A new size-dependent axially functionally graded(AFG) micro-beam model is established with the application of a reformulated strain gradient elasticity theory(RSGET). The new micro-beam model inco.porates the strain gradient, velocity gradient,and co.ple stress effects, and acco.nts for the material variation along the axial direction of the two-co.ponent functionally graded beam. The governing equations and co.plete boundary co.ditions of the AFG beam are derived based on Hamilton's principle. The co.rectness of the current model is verified by co.paring the static behavior results of the current model and the finite element model(FEM) at the micro-scale. The influence of material inhomogeneity and size effect on the static and dynamic responses of the AFG beam is studied. The numerical results show that the static and vibration responses predicted by the newly developed model are different from those based on the classical model at the micro-scale. The new model can be applied not only in the optimization of micro aco.stic wave devices but also in the design of AFG micro-sensors and micro-actuators.

关键词： Timoshenko beam theory reformulated strain gradient elastic theory(RSGET) axially functionally graded(AFG)material Hamilton's principle

Mechanical behavior analysis of high power co.mercial lithium-ion batteries

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Chinese Journal of Chemical Engineering 2023年第6期58卷 315-322页

作者： Ruicheng Shen Shaojun Niu Guobin Zhu Kai Wu Honghe Zheng co.lege of Energy Soochow UniversitySuzhou 215006China contemporary amperex technology Limited Ningde 352100China

In application,lithium-ion cells undergo expansion during *** mechanical behavior and the impact of external stress on lithium-ion battery are important in vehicle *** this work,18 Ah high power co.mercial cell with Li Ni_(0.5)co.(0.2)Mn_(0.3)O_(2)/graphite electrode were adopted.A co.mercial co.press machine was applied to monitor the mechanical characteristics under different stage of charge(SOC),lifetime and initial external *** dynamic and steady force was obtained and the results show that the dynamic force increases as the SOC increasing,*** the lifetime with high power driving mode,different external force is shown to have a great impact on the long-term cell performance,with higher stresses result in higher capacity decay rates and faster impedance increases.A proper initial external force(900 N)provides lower impedance *** analysis of the cells with2000 N initial force suggests a close co.relation between electrochemistry and mechanics in which higher initial force leads to higher direct current internal resistance(DCIR)increase *** addition,for the cell with higher external force,deformation of the cathode and thicker solid electrolyte interface(SEI)film on the surface of anode and separator are *** reduction and closure was also verified after cycles which is an obstacle to the lithium ion *** largest cause of the observed capacity decline was the loss of active lithium through autopsy *** addition,for the cell with higher external force,deformation of the cathode and thicker SEI film on the surface of anode and separator are *** reduction and closure was also verified after cycles which is an obstacle to the lithium ion *** largest cause of the observed capacity decline was the loss of active lithium through autopsy analysis.

关键词： Lithium-ion batteries External mechanical pressure Capacity fade Static pressure Dynamic pressure

A 3D co.ducting scaffold with in-situ grown lithiophilic Ni_(2)P nanoarrays for high stability lithium metal anodes

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Journal of Energy Chemistry 2021年第3期30卷 301-309页

作者： Huai Jiang Hailin Fan Zexun Han Bo Hong Feixiang Wu Kai Zhang Zhian Zhang Jing Fang Yanqing Lai School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Centre of Advanced Battery Materials The Ministry of EducationChangsha 410083HunanChina contemporary amperex technology co. Ltd.Ningde 352100FujianChina

Lithium(Li)metal is the most potential anode material for the next-generation high-energy rechargeable ***,intrinsic surface unevenness and‘hostless’nature of Li metal induces infinite volume effect and unco.trollable dendrite ***,we design the in-situ grown lithiophilic Ni_(2)P nanoarrays inside nickel foam(PNF).Uniform Ni_(2)P nanoarrays co.ting presents a very low nucleation overpotential,which induces the homogeneous Li deposition in the entire spaces of three-dimensional(3D)metal ***,the lithiophilic Ni_(2)P nanoarrays possess characteristics of electrical co.ductivity and structural stability,which have almost no expansion and damage during repeating Li plating/***,they chronically inhibit the growth of Li *** results in an outstanding co.lombic efficiency(CE)of 98% at 3 mA cm^(-2) and an ultra long cycling life over 2000 cycles with a low ***,the PNF-Li||LiFePO_(4) battery maintains a capacity retention of 95.3% with a stable CE of 99.9% over 500 cycles at 2 C.

关键词： Li metal anodes Ni_(2)P nanoarrays 3D metal framework Uniform Li deposition Superior lithiophilicity