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Spray pyrolysis feasibility of tungsten substitution for cobalt in nickel-rich cathode materials

International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2244-2252页

作者： Zihan Hou Lisheng Guo Xianlong Fu Hongxian Zheng Yuqing Dai Zhixing Wang Hui Duan Mingxia dong Wenjie Peng Guochun Yan Jiexi Wang Key Laboratory of Value-added Metallurgy of Hunan Province Engineering Research Center of the Ministry of Education for Advanced Battery MaterialsSchool of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China BASF Shanshan Battery Materials Co.Ltd. Changsha 410205China

Cobalt(Co)serves as a stabilizer in the lattice structure of high-capacity nickel(Ni)-rich cathode ***,its high cost and toxicity still limit its *** general,it is possible to perform transition metal substitution to reduce the Co ***,the traditional coprecipitation method cannot satisfy the requirements of multielement coprecipitation and uniform distribution of elements due to the differences between element concentration and deposition *** this work,spray pyrolysis was used to prepare lini_(0.9)Co_(0.1-x)W_(x)O_(2)(LNCW).In this regard,the pyrolysis behavior of ammonium metatungstate was analyzed,together with the substitu-tion of W for *** the possibility of spray pyrolysis,the Ni-Co-W-containing oxide precursor presents a homogeneous distribution of metal elements,which is beneficial for the uniform substitution of W in the final *** was observed that with W substitution,the size of primary particles decreased from 338.06 to 71.76 nm,and cation disordering was as low as 3.34%.As a consequence,the pre-pared LNCW exhibited significantly improved electrochemical *** optimal conditions,the lithium-ion battery assembled with lini_(0.9)Co_(0.0925)W_(0.0075)O_(2)(LNCW-0.75mol%)had an improved capacity retention of 82.7%after 200 cycles,which provides insight in-to the development of Ni-rich low-Co *** work presents that W can compensate for the loss caused by Co deficiency to a cer-tain extent.

关键词： lithium-ion batteries Ni-rich low-cobalt W substitution spray pyrolysis

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A Computational Study of Asymmetric Hydrogenation of 2-Phenyl Acrylic Acids Catalyzed by a Rh(l) Catalyst with Ferrocenyl Chiral Bisphosphorus Ligand: The Role of Ion-Pair Interaction

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Chinese Journal of Chemistry 2021年第6期39卷 1616-1624页

作者： Xiangru Fan lini Zheng Yuhong Yang Xiu-Qin dong Xumu Zhang Lung-Wa Chung Deportment of Chemistry Guangdong Provincial Key Laboratory of Catalysis and Shenzhen Grubbs InstituteSouthern University of Science and TechnologyShenzhenGuangdong 518055China Key Laboratory of Biomedical Polymers Engineering Research Center of Organosilicon Compounds&MaterialsMinistry of EducationCollege of Chemistry and Molecular SciencesWuhan UniversityWuhanHubei 430072China

Asymmetric hydrogenation reaction is one of the most efficient synthetic methods to form useful chiral compounds for synthetic chemistry,medicinal chemistry and material ***,the enantioselectivity of many hydrogenation reactions is controlled by steric hindrance between the chiral ligand and ***,Zhang group developed a highly asymmetric hydrogenation of 2-aryl and 2-alkyl acrylic acids catalyzed by a Rh(l)catalyst with a chiral Wudaphos *** excellent enantioselectivity of this asymmetric reaction was proposed to be controlled by ion-pair interaction between the substrate and chiral *** this study,a systematic density functional theory study has been carried out to investigate the reaction mechanism and origin of the *** computational results suggest that this reaction follows the classic mechanism involving oxidative addition of H_(2),migratory insertion and reductive *** from the C=C coordination to the metal in the common oxidative addition step,our study found that the chelation of the carboxyl group of the substrate to the cationic Rh(l)metal is more favorable in this oxidative addition *** high enantioselectivity is proposed to be dictated by a better catalyst/substrate geometric complementarity in the major pathway to have less distortion of the catalyst for a strong ion-pair interaction.

关键词： Hydrogenation Enantioselectivity Reaction mechanism Density functional theory Ion-pair interaction

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Enhanced cycling stability and rate performance of Co-doped and La_(2)O_(3)-coated lini_(0.9)Mn_(0.1)O_(2) toward power battery

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Rare Metals 2024年第2期43卷 658-670页

作者： Jia-Qi Peng Yuan-Yuan Wei dong-Ming Liu Yun Li Bin Hu Bin Huang Jian-Wen Yang Shun-Hua Xiao Ren-Heng Wang Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin541004China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China

Ultra-high nickel layered oxide cathode material with high energy density is the most promising material to improve the electrochemical performance of lithium-ion batteries(LIBs).However,the poor structural stability and severe surface/interface side reactions of the material lead to poor rate performance and cyclic stability,which limits its application in *** this paper,the dual-modification strategy of Co doping and La_(2)O_(3) coating is used to meet the above *** doping can effectively widen layer spacing and reduce Li^(+)/Ni^(2+) mixing,and La_(2)O_(3) coating can effectively eliminate the residual alkali on the surface of active material,inhibit the thickening of cathode electrolyte interphase(CEI)film and reduce surface/interface side ***,the modified material(NM90-CL)with excellent electrochemical properties is achieved through the synergistic enhancement of Co doping and La_(2)O_(3) *** capacity retention rate can reach 77.9%after 200 cycles at 1.0℃ and 75.7%after 200 cycles at 5.0℃.Its reversible capacity can up to 153.5 mAh·g^(–1) at 10.0℃.This dual-modification strategy will provide theoretical guidance and technical support for the synthesis of other high-performance electrode materials.

关键词： High nickel cathode material Co doping La_(2)O_(3) coating Electrochemical performance Electrochemical mechanism

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Oomycete Nudix effectors display WY-Nudix conformation and mRNA decapping activity

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Journal of Integrative Plant Biology 2024年第8期66卷 1548-1552页

作者： Baodian Guo Qinli Hu Bangwei Wang Deqiang Yao Haonan Wang Guanghui Kong Chenyang Han Suomeng dong Fengquan Liu Weiman Xing Yuanchao Wang Department of Plant Pathology Nanjing Agricultural UniversityNanjing 210095China Institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjing 210014China Department of Molecular Genetics University of Texas Southwestern Medical CenterDallasTexas 75390USA Institute of Aging&Tissue Regeneration Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China College of Horticulture Nanjing Agricultural UniversityNanjing 210095China College of Agriculture Guizhou UniversityGuiyang 550025China College of Life Sciences Shanghai Normal UniversityShanghai 200234China

Phytopathogens secrete effectors to promote colonization of their host *** effectors modulate host immune responses by interfering with various pathways,but little is known about their biochemical *** recent reports indicate that some phytopathogen effectors have Nudix hydrolase activity,including Avr3b from Phytophthora sojae(dong et al.,2011),AvrM14 from Melampsora lini (McCombe et al.,2023),and RipN from Ralstonia solanacearum (Sun et al.,2019).

关键词： plants Phytophthora biochemical

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Ir-Catalyzed Asymmetric Hydrogenation of Unprotected Indoles:Scope Investigations and Mechanistic Studies

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CCS Chemistry 2023年第6期5卷 1398-1410页

作者： Gongyi Liu lini Zheng Kui Tian Haifeng Wang Lung Wa Chung Xumu Zhang Xiu-Qin dong Engineering Research Center of Organosilicon Compounds and Materials Ministry of EducationCollege of Chemistry and Molecular SciencesWuhan UniversityWuhanHubei 430072 Pharmaceutical Research Institute Wuhan Institute of TechnologyWuhanHubei 430205 Department of Chemistry Shenzhen Grubbs Institute and Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhenGuangdong 518000 Suzhou Institute of Wuhan University SuzhouJiangsu 215123

Transition metal-catalyzed asymmetric hydrogenation(AH)of unprotected indoles has mainly been applied to alkyl substituted unprotected ***,the challenging aryl substituted unprotected indoles with poor reactivity and enantioselectivity(≤42%ee)could not be hydrogenated *** this work,a highly efficient Ir/bisphosphine-thiourea ligand ZhaoPhos catalytic system for the AH of challenging aryl substituted unprotected indoles has been successfully developed for the first time with high reactivity and excellent stereoselective ***,a series of 2-alkyl-substituted and 2,3-disubstituted unprotected indoles were also well tolerated in this catalytic system.A wide variety of chiral indoline derivatives were obtained in good to high yields with excellent stereoselectivities(75–99%yields,>20:1 dr,and 86–99%ee).The anion-binding activation strategy played an important role in accessing both high reactivity and excellent stereoselectivity,which was formed between the catalyst and unprotected indoles in situ-generating iminium ion with the assistance of Brønsted acid.A possible catalytic mechanism was proposed for this Ir-catalyzed AH according to density functional theory calculations and control experiment *** available substrates,a broad range of substrate tolerance,an efficient chiral catalytic system,and a gram-scale protocol further demonstrated the potential practicality of this methodology.

关键词： asymmetric hydrogenation unprotected indoles anion-binding activation strategy chiral indoline derivatives enantioselectivity

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Changes in early postoperative outcomes and complications observed in a single center during the 2022 COVID-19 pandemic wave in China:A single-center ambispective cohort study

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Chinese Medical Journal 2023年第14期136卷 1708-1718页

作者： lini Wang Ziyu Zheng Shouqiang Zhu Gang Luo Baobao Gao Yumei Ma Shuai Xu Hailong dong Chong Lei Department of Anesthesiology and Perioperative Medicine Xijing HospitalFourth Military Medical UniversityXi’anShaanxi 710032China Anesthesia Clinical Research Center Xijing HospitalFourth Military Medical UniversityXi’anShaanxi 710032China

Background:Currently,the effect of the 2022 nationwide coronavirus disease 2019(COVID-19)wave on the perioperative prognosis of surgical patients in China is ***,we aimed to explore its influence on postoperative morbidity and mortality in surgical ***:An ambispective cohort study was conducted at Xijing Hospital,*** collected 10-day time-series data from December 29 until January 7 for the 2018-2022 *** primary outcome was major postoperative complications(Clavien-Dindo class III-V).The association between COVID-19 exposure and postoperative prognosis was explored by comparing consecutive 5-year data at the population level and by comparing patients with and without COVID-19 exposure at the patient ***:The entire cohort consisted of 3350 patients(age:48.5±19.2 years),including 1759 females(52.5%).Overall,961(28.7%)underwent emergency surgery,and 553(16.5%)had COVID-19 exposure(from the 2022 cohort).At the population level,major postoperative complications occurred in 5.9%(42/707),5.7%(53/935),5.1%(46/901),9.4%(11/117),and 22.0%(152/690)patients in the 2018-2022 cohorts,*** adjusting for potential confounding factors,the 2022 cohort(80%patients with COVID-19 history)had a significantly higher postoperative major complication risk than did the 2018 cohort(adjusted risk difference[aRD],14.9%(95%confidence interval[CI],11.5-18.4%);adjusted odds ratio[aOR],8.19(95%CI,5.24-12.81)).At the patient level,the incidence of major postoperative complications was significantly greater in patients with(24.6%,136/553)than that in patients without COVID-19 history(6.0%[168/2797];aRD,17.8%[95%CI,13.6-22.1%];aOR,7.89[95%CI,5.76-10.83]).Secondary outcomes of postoperative pulmonary complications were consistent with primary *** findings were verified through sensitivity analyses using time-series data projections and propensity score ***:Based on a single-center observation,patients with recent COVID

关键词： COVID-19 Decision-making Surgery Omicron Postoperative complications

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不同比例CeO_(2)包覆LNMO材料的电化学性能研究

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电源技术 2024年第5期48卷 843-849页

作者：董怡辰王振波呼伦贝尔职业技术学院化学工程系内蒙古呼伦贝尔021000 哈尔滨工业大学化工与化学学院黑龙江哈尔滨150001

采用pH调控辅助共沉淀法制备lini_(0.5)Mn_(1.5)O_(4)(LNMO)正极材料,扫描电子显微镜(SEM)物理表征显示材料呈团聚球状颗粒形态。不同比例的CeO_(2)对LNMO正极材料包覆并优化其电化学性能,通过物理测试表征CeO_(2)-LNMO材料的结构及形貌... 详细信息

采用pH调控辅助共沉淀法制备lini_(0.5)Mn_(1.5)O_(4)(LNMO)正极材料,扫描电子显微镜(SEM)物理表征显示材料呈团聚球状颗粒形态。不同比例的CeO_(2)对LNMO正极材料包覆并优化其电化学性能,通过物理测试表征CeO_(2)-LNMO材料的结构及形貌,通过循环、倍率、伏安及阻抗等测试对CeO_(2)-LNMO材料进行电化学性能分析,研究得到:CeO_(2)包覆量为2%(质量分数)的CeO_(2)-LNMO材料表现出最优的电化学性能,5 C、10 C大倍率首次放电比容量为108.8和97.6 mAh/g,1 C循环100次后容量保持率为92.5%。CeO_(2)包覆可增强LNMO材料的导电性,提升材料的界面稳定性,从而使LNMO正极材料的电化学性能得到优化。

关键词： CeO_(2)包覆共沉淀法 lini_(0.5)Mn_(1.5)O_(4) 电化学性能

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层状高镍正极材料界面问题现状及分析

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稀有金属 2024年第7期48卷 1014-1026页

作者：冯航孙艳霞马路祥董生德周园成都理工大学材料与化学化工学院四川成都610059 中国科学院青海盐湖所青海西宁810008

锂离子电池因其高能量密度、长循环寿命、高功率和生态友好性等优势,已大规模应用于消费类电子、乘用车、商用车和储能等领域。在当前的锂离子电池系统中,正极材料是锂离子的来源,相较于磷酸铁锂,钴酸锂,锰酸锂正极材料,层状高镍正极材... 详细信息

锂离子电池因其高能量密度、长循环寿命、高功率和生态友好性等优势,已大规模应用于消费类电子、乘用车、商用车和储能等领域。在当前的锂离子电池系统中,正极材料是锂离子的来源,相较于磷酸铁锂,钴酸锂,锰酸锂正极材料,层状高镍正极材料因其理论比容量高、工作电压高、良好的循环性能和倍率性能等优点而备受关注,但该材料存在严重的界面不稳定性导致其循环性能和倍率性能不佳,制约了其推广应用。结合近几年的研究报道,介绍了高镍材料的结构变化机制以及脱嵌机制、表/界面化学反应和材料的失效模式,重点介绍了层状高镍材料的表面性质及不同组分之间的界面反应机制及对正极材料电化学性能的影响,总结对比了当前关于高镍材料改性的方法和成果,最后对高镍材料的表面改性和电解液界面构筑方面进行了总结,旨在为提升该材料的性能的相关研究提供参考。

关键词：锂离子电池高镍材料界面问题材料改性

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废旧lini_(0.5)Co_(0.2)Mn_(0.3)O_(2)材料球磨-喷雾法再生研究

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稀有金属与硬质合金 2024年第3期52卷 98-107页

作者：余函静邹昱凌董鹏孟奇昆明理工大学冶金与能源工程学院锂离子电池及材料制备技术国家地方联合工程实验室云南昆明650093

为了改善再生锂离子电池材料的电化学性能,提出了一种球磨-喷雾法对废旧lini_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)进行回收再生。该方法是通过对预处理后的废旧正极材料进行球磨细化,经过喷雾干燥迅速制备再生材料的前驱体,并结合高温... 详细信息

为了改善再生锂离子电池材料的电化学性能,提出了一种球磨-喷雾法对废旧lini_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)进行回收再生。该方法是通过对预处理后的废旧正极材料进行球磨细化,经过喷雾干燥迅速制备再生材料的前驱体,并结合高温煅烧制备再生NCM523材料。采用SEM、EDS、XRD、HRTEM、FT-IR、XPS、TG-DSC等对再生过程中材料的形貌、成分、物相及化学变化等进行了分析,且对再生NCM523组装的电池进行了电化学性能分析。结果表明,再生材料具有多孔结构,锂镍混排程度降低,电化学性能得到改善。在实验条件下得到的再生NCM523材料在0.11 C下的首圈放电比容量为159.053 mA·h/g,循环100圈后放电比容量为145.615 mA·h/g,容量保持率为91.55%,具有良好的容量保持率;电流密度为5 C的首圈放电比容量为126.974 mA·h/g。相较于传统的直接再生方法,球磨-喷雾再生法制备的NCM523的电化学性能得到明显改善。

关键词：废旧锂离子电池 lini_(0.5)Co_(0.2)Mn_(0.3)O_(2) 再生球磨-喷雾法

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蒸发干燥法制备lini_(0.5)Mn_(1.5)O_(4)正极材料

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蓄电池 2024年第4期61卷 151-155页

作者：董怡辰王振波呼伦贝尔职业技术学院化学工程系内蒙古呼伦贝尔021000 哈尔滨工业大学化工与化学学院黑龙江哈尔滨150001

以LiNO_(3)、Ni(NO_(3))_(2)·6H_(2)O和Mn(CH_(3)COO)_(2)·4H_(2)O为原料,采用蒸发干燥法制备锂电池用lini_(0.5)Mn_(1.5)O_(4)正极材料。将原料在玛瑙研钵中研磨后置于100℃水浴盆中。待固体物料溶解后,在混合物中加入的无水乙醇和... 详细信息

以LiNO_(3)、Ni(NO_(3))_(2)·6H_(2)O和Mn(CH_(3)COO)_(2)·4H_(2)O为原料,采用蒸发干燥法制备锂电池用lini_(0.5)Mn_(1.5)O_(4)正极材料。将原料在玛瑙研钵中研磨后置于100℃水浴盆中。待固体物料溶解后,在混合物中加入的无水乙醇和浓度为15.0 mol·L^(-1)的氨水,伴随机械搅拌。将混合物置于120℃的真空干燥室中,干燥2 h(始终在真空氛围中)以获得前驱体。把前驱体放在400℃空气中煅烧4 h,分解硝酸盐和醋酸盐,接着在不同温度的氧气中煅烧6 h,合成lini_(0.5)Mn_(1.5)O_(4)材料。将合成的lini_(0.5)Mn_(1.5)O_(4)材料放在600℃氧气氛围中退火氧化2 h,再冷却至室温。通过电化学测试得到,在烧结温度800℃,烧结时间6 h的条件下合成的lini_(0.5)Mn_(1.5)O_(4)正极材料具有较高的锂插层容量和良好的循环稳定性。

关键词： LiNO_(3) Ni(NO_(3))_(2)·6H_(2)O Mn(CH_(3)COO)_(2)·4H_(2)O lini_(0.5)Mn_(1.5)O_(4) 锂电池正极材料插层容量蒸发干燥法

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