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Dielectric polarization in MgFe_(2)O_(4) coating and bulk doping to enhance high-voltage cycling stability of Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2) cathode material

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Journal of Energy Chemistry 2023年第6期81卷 200-211,I0007页

作者： Xiaoqian Xu Yizhen huang Dan Li Qichang Pan sijiang hu Yahao Li Hongqiang Wang Youguo huang Fenghua Zheng Qingyu Li Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering&New EnergyChina Three Gorges UniversityYichang 443002HubeiChina Guangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and Devices Guangxi Normal UniversityGuilin 541004GuangxiChina

Charging P2-Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)to 4.5 V for higher capacity is enticing.However,it leads to severe capacity fading,ascribing to the lattice oxygen evolution and the P2-O2 phase transformation.Here,the Mg Fe_(2)O_(4) coating and Mg,Fe co-doping were constructed simultaneously by Mg,Fe surface treatment to suppress lattice oxygen evolution and P2-O2 phase transformation of P2-Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2)at deep charging.Through ex-situ X-ray diffraction(XRD)tests,we found that the Mg,Fe bulk co-doping could reduce the repulsion between transition metals and Na+/vacancies ordering,thus inhibiting the P2-O2 phase transition and significantly reducing the irreversible volume change of the material.Meanwhile,the internal electric field formed by the dielectric polarization of Mg Fe_(2)O_(4) effectively inhibits the outward migration of oxidized O^(a-)(a<2),thereby suppressing the lattice oxygen evolution at deep charging,confirmed by in situ Raman and ex situ XPS techniques.P2-Na NM@MF-3 shows enhanced high-voltage cycling performance with capacity retentions of 84.8% and 81.3%at 0.1 and 1 C after cycles.This work sheds light on regulating the surface chemistry for Na-layered oxide materials to enhance the high-voltage performance of Na-ion batteries.

关键词： P2-Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2) MgFe_(2)O_(4) Bulk doping Lattice oxygen evolution P2-O2 phase transformation

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Mg,Ti-base surface integrated layer and bulk doping to suppress lattice oxygen evolution of Ni-rich cathode material at a high cut-off voltage

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Journal of Energy Chemistry 2022年第8期31卷 434-444,I0012页

作者： Fan Peng Youqi Chu Yu Li Qichang Pan Guangchang Yang Lixuan Zhang sijiang hu Fenghua Zheng Hongqiang Wang Qingyu Li Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina Guangxi New Energy Ship Battery Engineering Technology Research Center Guangxi Normal UniversityGuilin 541004GuangxiChina

The Nickel-rich layered cathode materials charged to 4.5 V can obtain a specific capacity of more than 200 m Ah g^(-1).However,the nickel-rich layered cathode materials suffer from the severe capacity fade during high-voltage cycling,which is related to the phase transformation and the surface sides reactions caused by the lattice oxygen evolution.Here,the simultaneous construction of a Mg,Ti-based surface integrated layer and bulk doping through Mg,Ti surface treatment could suppress the lattice oxygen evolution of Nirich material at deep charging.More importantly,Mg and Ti are co-doped into the particles surface to form an Mg_(2)TiO_(4) and Mg_(0.5–x)Ti_(2–y)(PO_(4))_(3) outer layer with Mg and Ti vacancies.In the constructed surface integrated layer,the reverse electric field in the Mg_(2)TiO_(4) effectively suppressed the outward migration of the lattice oxygen anions,while Mg_(0.5–x)Ti_(2–y)(PO_(4))_(3) outer layer with high electronic conductivity and good lithium ion conductor could effectively maintained the stability of the reaction interface during highvoltage cycling.Meanwhile,bulk Mg and Ti co-doping can mitigate the migration of Ni ions in the bulk to keep the stability of transition metal–oxygen(M-O)bond at deep charging.As a result,the NCM@MTP cathode shows excellent long cycle stability at high-voltage charging,which keep high capacity retention of 89.3%and 84.3%at 1 C after 200 and 100 cycles under room and elevated temperature of 25 and 55°C,respectively.This work provides new insights for manipulating the surface chemistry of electrode materials to suppress the lattice oxygen evolution at high charging voltage.

关键词： Ni-rich layered oxide Mg Ti-base surface integrated layer Bulk doping Lattice oxygen evolution

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Hierarchical and lamellar porous carbon as interconnected sulfur host and polysulfide-proof interlayer for Li–S batteries

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eScience 2023年第1期3卷 89-98页

作者： Peifan Wang Xin Dai Peng Xu sijiang hu Xuyang Xiong Kunyang Zou Shengwu Guo Junjie Sun Chaofeng Zhang Yongning Liu Tengfei Zhou Yuanzhen Chen The State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049PR China Technical Monitoring Center Petro China Changqing Oil Field CompanyXi'an710018PR China Guangxi Key Laboratory of Low Carbon Energy Material Guangxi Normal UniversityGuilin541004China Institutes of Physical Science and Information Technology Anhui UniversityHefei230601PR China

A robust three-dimensional(3D)interconnected sulfur host and a polysulfide-proof interlayer are key components in high-performance Li–S batteries.Herein,cellulose-based 3D hierarchical porous carbon(HPC)and two-dimensional(2D)lamellar porous carbon(LPC)are employed as the sulfur host and polysulfide-proof inter-layer,respectively,for a Li–S battery.The 3D HPC displays a cross-linked macroporous structure,which allows high sulfur loading and restriction capability and provides unobstructed electrolyte diffusion channels.With a stackable carbon sheet of 2D LPC that has a large plane view size and is ultrathin and porous,the LPC-coated separator effectively inhibits polysulfides.An optimized combination of the HPC and LPC yields an electrode structure that effectively protects the lithium anode against corrosion by polysulfides,giving the cell a high ca-pacity of 1339.4 mAh g^(-1) and high stability,with a capacity decay rate of 0.021% per cycle at 0.2C.This work provides a new understanding of biomaterials and offers a novel strategy to improve the performance of Li–S batteries for practical applications.

关键词： Lithium-sulfur batteries Hierarchical porous carbon Lamellar porous carbon Interconnected sulfur host Polysulfide-proof interlayer

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Recent Progress of Catalytic Cathodes for Lithium-oxygen Batteries

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Research and Application of Materials Science 2022年第1期4卷 31-41页

作者： Wei WANG Simin WANG Longhai ZHANG sijiang hu Xuyang XIONG Tengfei ZHOU Chaofeng ZHANG Institutes of Physical Science and Information Technology Leibniz Joint Research Center of Materials SciencesAnhui Graphene Engineering LaboratoryAnhui UniversityHefei 230601China Guangxi Key Laboratory of Low Carbon Energy Material Guangxi Normal UniversityGuilin 541004China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Lithium-oxygen batteries are among the most promising electrochemical energy storage systems,which have attracted significant attention in the past few years duo to its far more energy density than lithium-ion batteries.Lithium oxygen battery energy storage is a reactive storage mechanism,and the discharge and charge processes are usually called oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).Consequently,complex systems usually create complex problems,lithium oxygen batteries also face many problems,such as excessive accumulation of discharge products(Li_(2)O_(2))in the cathode pores,resulting in reduced capacity,unstable cycling performance and so on.Cathode catalyst,which could influence the kinetics of OER and ORR in lithium oxygen(Li-O_(2))battery,is one of the decisive factors to determine the electrochemical performance of the battery,so the design of cathode catalyst is vitally important.This review discusses the catalytic cathode materials,which are divided into four parts,carbon based materials,metals and metal oxides,composite materials and other materials.

关键词： lithium oxygen battery cathode catalyst energy storage

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新工科背景下应用化学综合实验课程思政育人实践

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大学化学 2024年第2期39卷 214-220页

作者：胡思江王红强彭继明郑锋华潘齐常刘葵李庆余广西师范大学化学与药学学院广西桂林541004 桂林师范高等专科学校化学与药学系广西桂林541199

针对新工科理念和课程思政的要求,避免专业教育和思政教育“两张皮”的问题,从教材、课程教学和平台建设等方面介绍了新工科理念和课程思政在应用化学综合实验中的有机融合实践。在前期课程教学基础和初步实践基础上,提出了建设配套教... 详细信息

针对新工科理念和课程思政的要求,避免专业教育和思政教育“两张皮”的问题,从教材、课程教学和平台建设等方面介绍了新工科理念和课程思政在应用化学综合实验中的有机融合实践。在前期课程教学基础和初步实践基础上,提出了建设配套教材、发挥线上线下教学、搭建校内科研与工程实践平台、拓展校外实践基地等具体的改革路径,将课程思政全方位融入教学活动中,构建了应用化学综合实验课程思政育人新体系,助力新工科背景下新兴应用型人才培养。该实践可为其他实验课程开展新工科背景下课程思政改革提供参考。

关键词：新工科课程思政应用化学综合实验实践教学

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输电塔挂线角钢节点受力性能研究

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建筑结构 2022年第S2期52卷 1257-1261页

作者：张四江胡全黄林柯向越何松洋国网甘肃省电力公司建设分公司兰州730000 中国电力工程顾问集团西南电力设计院有限公司成都610000

根据特高压直流输电工程的实际数据,采用数值模拟分析,对中、重冰区内的直线塔挂线角钢节点的相关力学特性进行了研究分析。研究发现,挂点螺栓主要是受拉控制,挂点螺栓的剪切效应较弱,荷载作用部位和螺栓群的排布类型决定挂线角钢螺栓... 详细信息

根据特高压直流输电工程的实际数据,采用数值模拟分析,对中、重冰区内的直线塔挂线角钢节点的相关力学特性进行了研究分析。研究发现,挂点螺栓主要是受拉控制,挂点螺栓的剪切效应较弱,荷载作用部位和螺栓群的排布类型决定挂线角钢螺栓节点的应力大小,并且挂点垂直荷载是影响挂点位置应力与变形的重要因素。通过精细化数值模拟分析的相关结论,可为特高压输电塔的挂点角钢结构设计提供建议。

关键词：输电塔中、重冰区数值模拟挂线角钢

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苏州市吴中区东山镇入湖河道综合整治工程研究

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城市道桥与防洪 2023年第1期 122-125,I0013,I0014页

作者：胡兴华曹倩男苏祥郑莹倪思江悉地(苏州)勘察设计顾问有限公司江苏苏州215123

苏州市吴中区东山镇作为苏州市吴中区生态涵养区重要组成部分,乡镇的内河绝大部分沟通太湖,内河水质对太湖水质有一定的影响。由于周边地块内部雨、污水管道的混接、错接,加上周边农业面源污染,导致河道排河口非雨出流的现象严重,对周... 详细信息

苏州市吴中区东山镇作为苏州市吴中区生态涵养区重要组成部分,乡镇的内河绝大部分沟通太湖,内河水质对太湖水质有一定的影响。由于周边地块内部雨、污水管道的混接、错接,加上周边农业面源污染,导致河道排河口非雨出流的现象严重,对周边水环境造成严重的污染。故该项目根据《苏州生态涵养实验发展区规划》和《省政府关于印发江苏省水污染防治工作方案的通知》[1]提出的规划目标,结合对河道水质的监测结果,针对水质较差、断头浜等河道,采取控源截污、生态疏浚、生态修复等多种整治措施,确保河道水质稳定达标。后期结合农田面源污染控制、非雨出流溯源调查等多种手段,最终达到太湖东部湖区Ⅲ类水质的目标。

关键词：入湖河道控源截污生态疏浚生态修复

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CNN-based Model for Cell Extraction from PV Modules with EL Images for PV Defects Detection

CNN-based Model for Cell Extraction from PV Modules with EL ...

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第40届中国控制会议

作者： Xiaochen hu Wuqin Tang Jianghai Bi sijiang Chen Wenjun Yan College of Electrical Engineering Zhejiang University China Railway Construction Electrification Bureau Group Co. Ltd. Taizhou Institute of Zhejiang University

Electroluminescence technique has become a reliable technique for faults detects in the photovoltaic modules and it plays a key role in the process of module manufacturing and operation and management of photovoltaic plant. Given the inner structure of photovoltaic module, the defects of PV modules with EL images are all existed in the cell-level. Therefore, cell extraction is significant for the efficient and accurate detection of defects. In a PV module, a set of cells are connected and the borders between adjacent cells are not easy to detect due to the complexity of background in the EL image. In order to address the issue, a framework is proposed for the automatic cell extraction from PV modules in this letter. First, an image correction algorithm is introduced to correct the distortion;Then, the PV module is extracted from the complicated background based on the contour detection. Finally, a CNN-based model is proposed for cell segmentation and the proposed solution is evaluated from different aspects and the experimental results prove the effectiveness and superiority for cell extraction from photovoltaic modules.

关键词： Electroluminescence images CNN photovoltaic module cell extraction

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表面活性剂对Li_7La_3Zr_2O_(12)包覆富锂锰基层状正极材料的影响

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硅酸盐学报 2016年第4期44卷 493-497页

作者：彭继明陈玉华李玉胡思江王红强李庆余黄冈师范学院化工学院湖北黄冈438000 广西师范大学化学与药学学院广西桂林541004

采用锂镧锆氧(Li_7La_3Zr_2O_(12))快离子导体包覆Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2正极材料,获得了核壳结构复合材料,并探讨表面活性剂在包覆过程的作用机制。利用热重分析、X射线粉末衍射、扫描电子显微镜和电化学性能测试等... 详细信息

采用锂镧锆氧(Li_7La_3Zr_2O_(12))快离子导体包覆Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2正极材料,获得了核壳结构复合材料,并探讨表面活性剂在包覆过程的作用机制。利用热重分析、X射线粉末衍射、扫描电子显微镜和电化学性能测试等方法进行结构和性能分析。结果表明,以Tween 20为表面活性剂,600℃合成的Li_7La_3Zr_2O_(12)包覆的富锂正极复合材料的粒径均匀,首次放电比容量达273.2 m A·h/g,1C倍率下45次循环后的容量保持率为86.6%,显示出较好的电化学性能。Li_7La_3Zr_2O_(12)快离子导体壳层提高了电极/电解液界面Li^+的扩散速率,抑制了电解质与活性材料之间的副反应,进而提高了材料的首次Coulomb效率和循环稳定性。

关键词：锂离子电池富锂锰基正极材料核壳结构表面活性剂

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[Li,La]TiO_3包覆锂离子电池用正极材料LiMn_2O_4的电化学性能研究

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化工新型材料 2016年第3期44卷 214-216页

作者：蔡敏李玉胡思江王红强李庆余广西现代职业技术学院资源工程系河池547000 广西师范大学化学与药学学院桂林541004 黄冈师范学院化工学院黄冈438000

采用溶胶-凝胶法在锰酸锂(LiMn_2O_4)正极材料表面包覆一层[Li,La]TiO_3(LLTO),通过XRD、SEM、EDS等对LLTO包覆LiMn_2O_4材料的晶体结构、形貌及组成元素进行表征分析,并对其电化学性能进行了研究。结果表明:改性后的尖晶石LiMn_2O_4无... 详细信息

采用溶胶-凝胶法在锰酸锂(LiMn_2O_4)正极材料表面包覆一层[Li,La]TiO_3(LLTO),通过XRD、SEM、EDS等对LLTO包覆LiMn_2O_4材料的晶体结构、形貌及组成元素进行表征分析,并对其电化学性能进行了研究。结果表明:改性后的尖晶石LiMn_2O_4无杂相出现,循环性能稳定;在1C电流倍率条件下循环200次后,1.5%LLTO包覆的LiMn_2O_4材料在所有改性样品中循环性能最佳,其比容量为106.1mAh/g,高于空白LiMn_2O_4的92.7mAh/g,容量保持率高达90.8%,高于空白LiMn_2O_4的74.1%。

关键词：尖晶石锰酸锂钛酸镧锂表面改性电化学性能

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