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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 {2. 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 2.0 cycles at 1.0℃ and 75.7%after 2.0 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

An air-stable single-crystal layered oxide cathode based on multifunctional structural modulation for high-energy-density sodium-ion batteries

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science china Chemistry 2024年

作者： Yi-Feng Liu Hai-Yan hu Jia-Yang Li Hongrui Wang Yi Zhao Jingqiang Wang yuan-Bo Wu Yan-Jiang Li Guang-Yu Zhang Qing-Qun Sun Yan-Fang Zhu Rui-Ren Tang Xiong-wei Wu Jia-Zhao Wang Shi-Xue Dou Shu-Lei Chou Yao xiao Key Laboratory of Advanced Energy materials Chemistry (Ministry of Education) Nankai University School of Chemistry and materials science Hunan Agricultural University Institute of Energy materials science University of Shanghai for Science and Technology Wenzhou Key Laboratory of Sodium-Ion Batteries Wenzhou University Technology Innovation Institute for Carbon Neutralization Institute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University college of Chemistry and Chemical engineering Central South University

P2.type layered oxide, Na2.3Ni1/3Mn2.3O2. has drawn particular interest as a promising cathode material for sodium-ion batteries(SIBs) due to its fast sodium-ion transport channels with low migration potential. However, some catastrophic flaws, such as air instability, complicated multiphase evolution, and irreversible anionic redox, limit its electrochemical performance and hinder its application. Here, an air-stable single-crystal P2.type Na2.3Ni1/3Mn1/3Ti1/3O2.s proposed based on the multifunctional structural modulation of Ti substitution that could alleviate the issues for practical SIBs. As a result, the cathode with high energy density shows excellent air stability and highly reversible phase transitions(P2.OP4), and delivers faster kinetics and stable anion redox chemistry. Meanwhile, a thorough investigation of the relationship between structure, function, and properties is demonstrated,emphasizing formation processes, electrochemical behavior, structural evolution, and air stability. Overall, this study provides the direction of multifunctional structural modulation for the development of high-performance sodium-based layered cathode materials for practical applications.

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TA7钛合金板材高温拉伸变形

中国有色金属学报 2020年第5期30卷 1019-1026页

作者：张景祺林健呼啸魏瑞刚苑少乾北京工业大学材料科学与工程学院北京100124 首都航天机械有限公司北京100076

利用Gleeble−1500D热模拟试验机对板厚为4 mm的TA7 ELI材料在变形温度为800、850、900、950和1000℃,应变速率为0.01 s^−1和0.001 s^−1下进行高温拉伸实验,获得材料发生超塑性变形的温度区间和应变速率范围。采用炉中高温拉伸实验对Glee... 详细信息

利用Gleeble−1500D热模拟试验机对板厚为4 mm的TA7 ELI材料在变形温度为800、850、900、950和1000℃,应变速率为0.01 s^−1和0.001 s^−1下进行高温拉伸实验,获得材料发生超塑性变形的温度区间和应变速率范围。采用炉中高温拉伸实验对Gleeble实验结果进行验证。得出在950~1000℃范围内,应变速率低于0.001 s^−1时,TA7 ELI钛合金高温拉伸会出现超塑性变形。伸长率最高可达2.0%。在应变速率0.001 s^−1、800℃时,TA7钛合金的断口组织中有动态再结晶现象。1000℃时,断口出现较为粗大的层片状α组织和明显的晶粒长大现象。m和n值都随着温度的升高而增大,在950℃时到达最大值。硬化现象能够有效的抑制颈缩,变形温度为950℃时,材料的硬化和软化达到较好的平衡,易获得较大的伸长率。

关键词： TA7钛合金超塑性高温拉伸应变硬化指数应变速率敏感性指数

Ti_2.lC/TiAl基复合材料的制备及其力学性能

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材料热处理学报 2017年第3期38卷 10-15页

作者：王维艾桃桃冯小明李文虎蒋鹏袁新强孛海娃景然陕西理工大学材料科学与工程学院陕西汉中723000

以Ti-Al-Ti_3AlC_2.反应体系,采用真空热压技术(1100℃×1 h)制备Ti_2.lC/TiAl基复合材料。借助XRD、SEM等测试手段分析相组成以及微观结构,并测量其密度、维氏硬度、抗弯强度、抗压强度和断裂韧性等室温力学性能。结果表明,产物主要由... 详细信息

以Ti-Al-Ti_3AlC_2.反应体系,采用真空热压技术(1100℃×1 h)制备Ti_2.lC/TiAl基复合材料。借助XRD、SEM等测试手段分析相组成以及微观结构,并测量其密度、维氏硬度、抗弯强度、抗压强度和断裂韧性等室温力学性能。结果表明,产物主要由TiAl、Ti_2.lC和Ti_3Al相组成。利用Ti_3AlC_2.解反应原位自生的Ti_2.lC增强相主要分布于基体晶界处,部分钉扎于晶内,且随着Ti_2.lC生成量的增大,团聚现象加剧。室温力学性能测试表明,Ti_2.lC/TiAl基复合材料的力学性能明显优于单相TiAl材料,当Ti_3AlC_2.杂量为10 mass%时,综合性能较好,密度、硬度、抗弯强度、抗压强度和断裂韧性分别为3.97 g/cm^3、4.82.GPa、488.61 MPa、1340 MPa和5.68 MPa·m^(1/2.。断裂机制主要表现为沿晶断裂、穿晶断裂、裂纹偏转与桥联;颗粒相增韧、裂纹偏转与桥联以及层状增韧是主要的增韧方式。

关键词： Ti2.lC/TiAl基复合材料微观结构力学性能断裂

日光温室不同时段补光对番茄果实品质及挥发性物质影响

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农业工程学报 2020年第8期36卷 188-196页

作者：魏守辉肖雪梅钟源郁继华吕剑胡琳莉唐中祺柳帆红王舒亚坚乃丹甘肃农业大学园艺学院兰州730070 甘肃农业大学干旱生境作物学重点实验室兰州730070

为探明日光温室中提高番茄产量和品质的最佳补光时段,以"粉太郎"番茄为试材,从植株定植后第2.天到第一穗果完全成熟时进行补光,利用LED灯设置3种补光时段:揭帘前补光5 h(T1)、盖帘后补光5 h(T2.、揭帘前盖帘后分别补光2.5h(T3),以不补... 详细信息

为探明日光温室中提高番茄产量和品质的最佳补光时段,以"粉太郎"番茄为试材,从植株定植后第2.天到第一穗果完全成熟时进行补光,利用LED灯设置3种补光时段:揭帘前补光5 h(T1)、盖帘后补光5 h(T2.、揭帘前盖帘后分别补光2.5h(T3),以不补光作为对照(CK),研究其对番茄产量、果实品质以及挥发性物质成分和含量的影响。结果表明:补光处理可提高番茄平均单株产量、果实可溶性糖含量、可溶性固形物含量、糖酸比、挥发性物质总数量和总质量分数,但会降低有机酸含量,T1处理效果最显著(P12.酮类、2.种醛类、2.种醇类、6种酯类、6种烃类和15种其他类物质。各处理挥发性物质总数量和总质量分数由大到小为:T1(68种,3 107.98μg/kg)、T3(65种,2.610.74μg/kg)、T2.63种,2.438.96μg/kg)、CK(59种,2.086.03μg/kg)。每个处理醇类含量最多,烃类含量最低,并且含量最高的物质均是顺-3-己烯-1-醇。3种补光处理均可提高酮类、醛类、醇类和其他类物质含量,但显著降低烃类物质含量(P1处理时有所提高。所有被检测出的挥发性物质包含11种番茄特征香气成分,主要分为花香、果香与青香3种类型,其中青香味物质含量最多。综上,对番茄进行补光尤其是揭帘前补光5 h可有效提高番茄产量、果实品质和风味,是当地日光温室越冬茬番茄栽培的较优补光时段。研究结果可为设施番茄种植的光环境调控技术提供科学依据。

关键词：温室光质番茄补光时段产量果实品质挥发性物质顶空固相微萃取气相色谱-质谱联用