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Revealing the critical effect of solid electrolyte interphase on the deposition and detriment of Co(Ⅱ) ions to graphite anode

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Journal of Energy Chemistry 2022年第6期31卷 389-396,I0011页

作者： Qiming Xie Jiawei Chen Lidan Xing xianggui zhou Zekai Ma Binhong Wu Yilong Lin Hebing zhou Weishan Li China National and Local Joint Engineering Research Center of MPTES in High Energy andSafety LIBs Engineering Research Center of MTEES(Ministry of Education)Research Center of BMET(Guangdong Province).Schoolof Chemistry.South China Normal University.Guangzhou 510006.Guangdong.China

"Dissolution,migration,and deposition"of transition metal ions (TMIs) result in capacity degradation of lithium-ion batteries (LIBs).Understanding such detrimental mechanism of TMIs is critical to the development of LIBs with long cycle life.In most previous works,TMIs were directly introduced into the electrolyte to investigate such a detrimental mechanism.In these cases,the TMIs are deposited directly on the fresh anode surface.However,in the practical battery system,the TMIs are deposited on the anode covered with solid electrolyte interphase (SEI) film.Whether the pre-presence of SEI film on anode surface influences the deposition and detriment of TMIs is unclear.In this work,the deposition of Co element on graphite anode with and without SEI film were systematically studied.The results clearly show that,in comparison with that of fresh graphite (SEI-free),the presence of SEI film aggravates the deposition of Co ions due to the Li^(+)–Co^(2+) ion exchange between the SEI and Co^(2+)-containing electrolyte without the driving of the electric field,leading to faster capacity fading of graphite anode.Therefore,how to regulate electrolytes and film-forming additives to design the components of SEI and prevent its exchange with TMIs,is a crucial way to inhibit the deposition and detriment of TMIs on graphite anode.

关键词： Lithium-ion batteries Transition metal ions Ion exchange Graphite anode SEI film

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 anode.In this work,we report a new strategy to address this issue.It is found that the cyclic stability of Ni-rich/Li battery can be significantly improved by using succinic anhydride(SA) as an electrolyte additive.Specifically,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% SA.The 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 effects.On anode side,SA can but MA and CA cannot form a protective solid electrolyte interphase(SEI) on Li anode.On cathode side,three anhydrides can suppress the formation of hydrogen fluoride from electrolyte oxidation decomposition,but SA behaves best.Typically,MA shows adverse effects on the interface stability of Li anode and NCM811 cathode,which originates from its high acidity.Though 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 components.This 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

Two gene clusters and their positive regulator SlMYB13 that have undergone domestication-associated negative selection control phenolamide accumulation and drought tolerance in tomato

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Molecular Plant 2024年第4期17卷 579-597页

作者： Peng Cao Jun Yang Linghao Xia Zhonghui Zhang Zeyong Wu Yingchen Hao Penghui Liu Chao Wang Chun Li Jie Yang Jun Lai xianggui Li Meng Deng Shouchuang Wang School of Breeding and Multiplication(Sanya Institute of Breeding and Multiplication) Hainan UniversitySanya 572025China College of Tropical Agriculture and Forestry Hainan UniversityHaikou 572208China Collaborative Innovation Center of Nanfan and High-Efficiency Tropical Agriculture Hainan UniversityHaikou 572208China

Among plant metabolites,phenolamides,which are conjugates of hydroxycinnamic acid derivatives and polyamines,play important roles in plant adaptation to abiotic and biotic stresses.However,the molecular mechanisms underlying phenolamide metabolism and regulation as well as the effects of domestication and breeding on phenolamide diversity in tomato remain largely unclear.In this study,we performed a metabolite-based genome-wide association study and identified two biosynthetic gene clusters(BGC7 and BGC11)containing 12 genes involved in phenolamide metabolism,including four biosynthesis genes(two 4CL genes,one C3H gene,and one CPA gene),seven decoration genes(five AT genes and two UGT genes),and one transport protein gene(DTX29).Using gene co-expression network analysis we further discovered that SlMYB13 positively regulates the expression of two gene clusters,thereby promoting phenolamide accumulation.Genetic and physiological analyses showed that BGC7,BGC11 and SlMYB13 enhance drought tolerance by enhancing scavenging of reactive oxygen species and increasing abscisic acid content in tomato.Natural variation analysis suggested that BGC7,BGC11 and SlMYB13 were negatively selected during tomato domestication and improvement,leading to reduced phenolamide content and drought tolerance of cultivated tomato.Collectively,our study discovers a key mechanism of phenolamide biosynthesis and regulation in tomato and reveals that crop domestication and improvement shapes metabolic diversity to affect plant environmental adaptation.

关键词： tomato phenolamides gene cluster drought tolerance natural variation evolution

Degradation of platinum electrocatalysts for methanol oxidation by lead contamination

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中国化学快报：英文版 2023年第2期34卷 610-612页

作者： Zihao Li xianggui zhou Subhash Singh Xiaoming Wei Chunlei Guo Weishan Li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China The Institute of Optics University of RochesterRochesterNew York 14627United States School of Chemistry South China Normal UniversityGuangzhou 510006China

Platinum exhibits high electrocatalytic activity toward various reactions but might be poisoned by some species. This communication reports a new finding that the electrocatalytic activity of platinum for methanol oxidation will be largely lost in a lead-contaminated environment. This activity loss is demonstrated in an electrochemical cell using a lead counter electrode for measuring the activity of platinum electrode towards methanol oxidation. The recorded methanol oxidation current in this cell is significantly decreased compared with that using a platinum counter electrode. The possible mechanism is related to the adsorption of trace lead ions from the lead counter electrode, as confirmed by comparing the calculated binding energies of platinum and lead ions with oxygen ion. This report is of great importance for reliably designing and efficiently managing direct methanol fuel cells, because trace lead might be present in various components in the fuel cell systems or in air and attention should be paid to its negative effect.

关键词： Activity degradation Platinum electrocatalyst Lead contamination Methanol oxidation Binding energy

基于RS与GIS技术的喀斯特煤矿区生态环境质量评价:以盘州市为例

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中国矿业 2024年第2期33卷 63-68页

作者：刘发勇田祥贵何林贵州盘江煤电集团技术研究院有限公司贵州贵阳550081

针对喀斯特煤矿区特殊的地质环境特点,综合考虑影响生态环境质量的因素,选取与煤矿开采活动关联的指标因子,建立喀斯特煤矿区生态环境质量综合评价指标体系。通过对评价指标的分级处理,利用RS与GIS技术对指标因子进行单一评价分析,并在A... 详细信息

针对喀斯特煤矿区特殊的地质环境特点,综合考虑影响生态环境质量的因素,选取与煤矿开采活动关联的指标因子,建立喀斯特煤矿区生态环境质量综合评价指标体系。通过对评价指标的分级处理,利用RS与GIS技术对指标因子进行单一评价分析,并在ArcGIS栅格数据空间叠加分析计算的支持下,采用综合指数法和层次分析法对盘州市生态环境质量进行综合评价,从而得到盘州市喀斯特煤矿区的生态环境质量等级。评价结果显示,盘州市生态环境质量大部分较好,优良等级占比达75.03%,但部分区域山高坡陡、植被覆盖度低及煤矿开采区相对应的生态环境情况较差;在生态环境保护及经济发展的规划中应以生态环境质量较差的区域为主,加强矿山土地复垦、植树造林等一系列生态恢复措施。在综合评价时引入生态环境质量网格化评价方法,通过一定范围内生态环境质量等级面积及权重的定量计算,为区域生态环境质量评价提供参考。

关键词：喀斯特煤矿区生态环境质量 GIS技术指标体系生态修复

基于终身学习的直升机装配车间物料送达时间预测

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Transactions of Nanjing University of Aeronautics and Astronautics 2024年第2期41卷 147-157页

作者：马立俊阳祥贵郭宇童周强黄少华刘道元南京航空航天大学机电学院中国南京210016 江西昌河航空工业有限公司中国景德镇333000

关键物料的缺失已成为影响直升机装配生产计划执行的关键因素之一。准确的物料送达时间可指导装配生产计划的制定,一定程度上避免了由缺料导致的生产计划频繁变更。在直升机车间内部数据共享的基础上,一种基于终身学习的物料送达时间预... 详细信息

关键物料的缺失已成为影响直升机装配生产计划执行的关键因素之一。准确的物料送达时间可指导装配生产计划的制定,一定程度上避免了由缺料导致的生产计划频繁变更。在直升机车间内部数据共享的基础上,一种基于终身学习的物料送达时间预测模型被提出。该模型由门控循环单元(Gated recurrent unit,GRU)网络层、ReLU激活层和全连接层构成,在实时预测时,可快速存储新的记忆且不遗忘旧的。为避免在实时预测中的精度大幅度降低,一种正则化的参数约束方式被提出来对模型参数进行调整。该方法的应用使得模型在目标域数据上的预测误差从0.0329降低到0.0134。使用25个物料清单数据进行模型验证。通过与L2正则化、EWC正则化等常用的正则化方法进行对比,验证了所建立的模型在实时预测上的准确性与实用性。

关键词：直升机装配车间物料送达预测终身学习参数正则化

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废旧胶粉改性及其在聚合物中的应用

现代塑料加工应用 2024年第2期36卷 44-46,57页

作者：刘子荣刘海刘祥贵龚春丽湖北工程学院化学与材料科学学院湖北孝感432000 湖北大学材料科学与工程学院湖北武汉430062 湖北大洋塑胶有限公司湖北随州441300

概述了废旧胶粉的改性方法,包括物理改性法、化学改性法和微生物改性法,以及废旧胶粉在聚合物中的应用。

关键词：废旧胶粉改性共混聚合物

An Electrocatalytic Strategy for Dehydrogenative[4+2]Cycloaddition over a Cobalt-Based Catalyst

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Chinese Journal of Chemistry 2022年第23期40卷 2741-2746页

作者： Xiaomeng Xue Ye Wang Lina zhou Ruixiang Ge Jiangrong Yang xianggui Kong Ming Xu Zhenhua Li Lina Ma Haohong Duan State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSiNOPECBeijing 100083China

Exploring the anodic reaction to substitute conventional oxygen evolution reaction(OER)for the synthesis of complex pharmaceutical molecules is highly attractive.Here,we report an electrocatalytic strategy for dehydrogenative[4+2]cycloaddition of N,N-dialkylanilines with maleimides via dual functionalization of both C(sp3)-H and C(sp2)-H bonds,by using an electrochemically activated cobalt carbonate hydroxide hydrate supported on carbon cloth(CCHH-A/CC),affording various tetrahydroquinolines with high yields.This electrochemical transformation proceeds with high activity and stability,as well as good substrate compatibility.Mechanism study shows thatα-aminoalkyl radical exists in the electrooxidation reaction.This strategy shows significant potential for the synthesis of valuable chemicals by using an electrocatalytic strategy.

关键词： Cycloaddition C-H activation Dehydrogenation Eletrooxidation reactions Cobalt-based catalyst

考虑全寿命周期的UHPC加固墩柱截面性能研究

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混凝土 2024年第4期 178-182,191页

作者：许祥贵赵兴华张智博韩笑中交一公局第四工程有限公司广西南宁530031 中交公路长大桥建设国家工程研究中心有限公司北京100120

针对某高速公路改扩建工程中墩柱的钢筋锈蚀、混凝土剥落露筋等病害以及部分伸缩墩的墩柱存在竖向裂缝、环向裂缝的问题,从全寿命周期角度考虑,采用UHPC增大截面加固法对墩柱塑性铰区域进行加固处理。在原有C40混凝土加固方案的基础上,... 详细信息

针对某高速公路改扩建工程中墩柱的钢筋锈蚀、混凝土剥落露筋等病害以及部分伸缩墩的墩柱存在竖向裂缝、环向裂缝的问题,从全寿命周期角度考虑,采用UHPC增大截面加固法对墩柱塑性铰区域进行加固处理。在原有C40混凝土加固方案的基础上,设计考虑了UHPC强度(120 MPa和140 MPa)、UHPC加固层厚度(8 cm和10 cm)、墩柱设计直径(1.0 m、1.2 m、1.4 m和1.5 m)以及加固层是否配筋4种因素影响的加固方案。利用XTRACT软件分析了加固墩柱截面M-N曲线和M-φ曲线,研究了UHPC强度、加固层厚度、墩柱直径及加固层是否配筋对墩柱截面力学性能的影响。最后,从结构性能、耐久性、混凝土用量及美观性等方面综合对比分析了不同加固方案的加固效果。结果表明:UHPC强度对加固墩柱截面性能影响不大,墩柱承载力随着UHPC加固层厚度的增大而增大;对于不同设计直径的墩柱结构,加固10 cm厚度的UHPC与加固20 cm厚度的C40混凝土均可达到相同的承载能力水平;加固层配筋能够提高墩柱承载力,但8 cm厚UHPC配筋加固远不如10 cm厚UHPC加固效果。相较普通混凝土,利用UHPC加固能够减少或免除墩柱的维修,大幅降低养护成本,降低工程全寿命造价。

关键词：超高性能混凝土增大截面加固法加固层厚度截面力学性能全寿命周期