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19篇 您的检索式:关键字=MCMB
    题名 作者 年代 出处 被引量
1中间相碳微珠(MCMB)的开发、性质和应用显示文摘本文概述了中间相碳微珠(MCMB)的开发历史、制备方法、性质和应用前景。许斌 陈鹏 1996新型炭材料1996,11,3:24
2Electrochemical performance of MCMB/(AC+LiFePO_4) lithium-ion capacitors显示文摘Lithium-ion capacitors(LICs) were fabricated using mesocarbon microbeads(MCMB) as a negative electrode and a mixture of activated carbon(AC) and LiFePO4 as a positive electrode(abbreviated as LAC).The phase structure and morphology of LAC samples were characterized by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM).The electrochemical performance of the LICs was studied using cyclic voltammetry,charge-discharge rate measurements,and cycle performance testing.A LIC with 30 wt% LiFePO4 was found to have the best electrochemical performance with a specific energy density of 69.02 W h kg-1 remaining at 4 C rate after 100 cycles.Compared with an AC-only positive electrode system,the ratio of practical capacity to theoretical calculated capacity of the LICs was enhanced from 42.22% to 56.59%.It was proved that adding LiFePO4 to AC electrodes not only increased the capacity of the positive electrode,but also improved the electrochemical performances of the whole LICs via Li+ pre-doping.PING LiNa ZHENG JiaMing SHI ZhiQiang QI Jie WANG ChengYang 2013Chinese Science Bulletin2013,58,6:12
3新型中间相炭微球的制备及表征显示文摘采用甲醛对煤沥青进行聚合改性,然后经热聚合工艺制备中间相炭微球(MCMB),并对MCMB的结构及性能进行了研究.采用偏光显微镜和XRD对MCMB的结构进行分析,采用SEM对所制备的MCMB形貌进行分析,采用TGA对MCMB的热行为进行分析.结果表明,所制备的MCMB收率达35.1%,其平均粒径约为10μm,MCMB表面聚集了粒径小于0.5μm的小球;粒径较小的MCMB在偏光显微镜下不呈现各向异性;MCMB的平均微晶层间距d002为0.3420nm,平均微晶高度Lc为3.42nm,平均微晶大小La为2.38nm;MCMB的5%(质量分数)热分解温度为618℃,整个过程的总失重率为15.12%.柯余良 林起浪 郭单余 张高校 2009煤炭转化2009,32,4:11
4成型工艺条件对MCMB/石墨复合材料性能的影响显示文摘为确定MCMB/石墨复合材料双极板模压成型工艺参数,采用w(MCMB)∶w(石墨)=9∶1组成的复合材料制备一组试件并测试其性能.详细分析了不同模压成型压力和烧结温度等工艺参数对MCMB/石墨复合材料的电阻率、抗弯强度和抗压强度的影响,并简要分析了其形成的机理.结果表明:MCMB/石墨复合材料的电阻率和力学性能存在互斥性;MCMB/石墨复合材料双极板模压成型工艺的模压成型压力为3~4 MPa,烧结温度为900℃.朱昱 汪兴兴 倪红军 黄明宇 2009南通大学学报(自然科学版)2009,8,1:9
5MCMB颗粒度分布对锂离子电池性能的影响显示文摘研究了锂离子电池中负极炭粉MCMB的颗粒度分布对电池性能的影响。试验结果表明,当颗粒度从11.12 μm 增大到24.81 μm 时,电池的第一次充放电效率由86.2 % 增加到90.5% ,即颗粒度大,放电容量高。但是,颗粒度大,循环寿命稍差。进一步研究表明,大小颗粒度的重量比为7:3 的MCMB粉末具有高放电容量和长循环寿命。张泽波 王伯良 刘秀生 杨清欣 张春艳 1999新型炭材料1999,14,4:9
6由中间相炭微球制备高密度各向同性炭显示文摘以中间相炭微球(MCMB)为原料,在常温下压制成型。所用MCMB由不同一次吡啶不溶物含量的煤焦油在不同条件下聚合后通过热过滤及吡啶抽提分离而得。考察了不同原料、成型压力、热处理温度及升温速率对炭制品的密度及收缩率的影响。1000℃下炭化后炭制品的表观密度最高达1.75g/cm3。吕永根 凌立成 刘朗 张碧江 吴东 1998炭素1998,,4:8
7煤焦油热解制备中间相炭微球显示文摘含有3.7%吡啶不溶物的煤焦油和经热过滤去除吡啶不溶物的净化焦油在自升压下聚合,产物经热过滤去除母液,滤饼用吡啶抽提至无色得中间相炭微球。在偏光显微镜下观察聚合产物的结构,在扫描电镜下观察中间相炭微球的形貌。结果表明,由于聚合产物粘度较低,所产生的MCMB易于从母液中分离出来;原料中的吡啶不溶物有利于阻止MCMB的融并,在一定程度上可起到控制球径的作用;对无吡啶不溶物煤焦油高温短时间聚合后骤冷有利于阻止中间相炭微球的融并。吕永根 凌立成 吴东 刘朗 张碧江 1998燃料化学学报1998,26,5:7
8MCMB粒度及分布对锂离子蓄电池性能的影响显示文摘中间相碳球微珠(MCMB)是一种常用的锂离子蓄电池负极材料。文中就其粒度及其分布对电池性能的影响加以研究讨论。将MCMB按粒度与分布分成五组,按相同工艺制成ICR18650 电池,测试电池初容量效率和循环寿命,结果表明:粒度及分布由小到大,初放效率由86% 升高到91% ;合理的粒度分布有利于提高电池的循环寿命,颗粒度D50 在20 μm ,且分布呈偏心正态分布。杨清欣 王伯良 张泽波 刘秀生 1999电源技术1999,23,5:7
9Investigation of tribological performances of MCMB显示文摘Tribological properties of Meso-carbon Microbeads (MCMB) powders as a special addi-tive in pentaerythritol were investigated on an Optimal SRV tribotester at 300℃. The coarsely dis-persed lubricant system demonstrates fine lubricious effectiveness at the operation temperature.The friction coefficient dropped from 0.2 to circa 0.12 in the presence of MCMB in pentaerythritolfor the No.45 carbon steel tribomate. Raman spectroscopy analysis indicated the partial transfor-mation of MCMB into increased ordered structures that contributed to the lowering of friction.CUI Xiaohao LI Shenghua SONG Huaihe JIN Yuansheng FU Honglan 1. National Tribology Laboratory, Tsinghua University, Beijing 100084, China 2. Institute of Carbon Fibers & Composites, Beijing University of Chemical Technology, Beijing 100029, China 3. Department of Biology, Peking University, Beijing 100871, China 2001Science China Mathematics2001,44,S1:6
10中间相炭微球的制备及嵌锂性能考察显示文摘为了获得更高嵌锂性能的锂离子电池负极用炭材料,以质量分数为3 7%吡啶不溶物的煤焦油为原料,在450℃下自生压热缩聚制备中间相炭微球(MCMB),采用恒电流充放电技术研究所得MCMB的充放电性能.研究发现:随着MCMB平均球径的增加,首次充放电可逆容量从246mA·h/g增至540mA·h/g,首次充放电效率先增加后减小;本实验条件下平均球径为8 9μm的MCMB的充放电性能最好.李宝华 李开喜 吕永根 凌立成 康飞宇 2003材料科学与工艺2003,11,4:4
11高功率动力电池负极材料的研究显示文摘对锂离子动力电池负极用材料:中间相碳微球(MCMB)、软碳(SC)进行了对比研究。发现MCMB在高倍率放电性能上表现较好,而软碳材料在高倍率充电性能方面更加突出。为得到在高倍率充电、放电性能两方面都比较优越的负极材料,对MCMB和软碳进行了不同比例混掺的研究,结果表明:当MCMB与软碳的混掺比例达到5∶5时,电池的大倍率充放电性能表现较优越,能够满足功率型电池应用的需要。张火成 郭玉彬 张娜 王永武 2016电源技术2016,40,6:4
12不同尺寸MCMB石墨化性能的比较显示文摘用X射线衍射方法分析了 3种不同尺寸MCMB的石墨化性能。结果显示 3种MCMB都具有良好的石墨化性能 ,但由于外形尺寸的不同 。曾凡毅 李树军 2001炭素技术2001,20,3:3
13锂离子电池负极材料MCMB的过充电行为显示文摘研究了过充电对MCMB电极性能的影响。在电位为-0.045 V(vs.Li/Li+)时,会发生锂的沉积,且过充时间越长、倍率越高,锂的沉积质量越大。过充电后,MCMB电极的充放电性能下降。SEM与XRD的分析结果说明:过充电后MCMB电极的结构没有发生变化,性能下降是电极表面沉积的锂与电极表面形成的钝化膜所致。王力臻 朱继涛 李中东 李荣福 2007电池2007,37,3:2
14氧化铁掺杂对中间相炭微球制备的影响研究显示文摘中间相炭微球(MCMB)是一具有极大开发潜力和应用前景的新型炭材料。通过对MCMB的微观结构、粒径分布、收率、热失重等性能检测与分析,探讨了氧化铁掺杂对MCMB制备的影响规律。结果表明:添加氧化铁有利于MCMB表面的絮状物减少,球形度变好,粒径分布变窄;氧化铁可以促进反应的进行,使MCMB的收率随氧化铁增加而提高;氧化铁掺杂对MCMB失重率有一定的影响,使热失重较快达到平稳状态。孙国娟 熊杰明 葛明兰 方国 韩迪 2011北京石油化工学院学报2011,19,3:2
15尖晶石型Li_(0.9)Mg_(0.05)Mn_(1.95)O_4的合成及其性能显示文摘为了提高尖晶石型LiMn2O4材料的循环性能,采用掺杂金属的高温固相合成法合成了尖晶石型Li0.9Mg0.05Mn1.95O4材料,并以该材料作正极材料,中间相炭微球(MCMB)为负极材料,组装成562247型方型锂离子蓄电池。测试结果表明,750 ℃下烧结的尖晶石型Li0.9Mg0.05Mn1.95O4循环性能最好。在室温下,1 C充放电时电池比能量为83 Wh/kg和195 Wh/L,实际电池中所制材料比容量可达85 mAh/g,循环300次后电池的可逆容量变化很小。另外,还对电池的储存性能、倍率充放电性能及高低温性能进行了研究。陈猛 史鹏飞 李胜军 2004电源技术2004,28,10:1
16Comparative Study on Super Fine Mesophase Powder and MCMB Used to Manufacture High-Density Isotropic Carbon Bulks显示文摘Mesocarbon microbeads (MCMB) and super fine mesophase powder (SFMP) were prepared firstly from a coal tar pitch and then hot-condensed into high-density isotropic carbon (HDIC) bulks under 160 MPa and finally sintered at 1 000 ℃ . By analyzing the ther-mogravimetric behavior of the MCMB and SFMP powders, their volume shrinkage and weight loss during sintering and the bulk density and flexural strengths of their sintered bulks, it was found that the smaller sizes and the richer β-resin contents of SFMP have facilitated formation of sintered bulks with more compact isotropic structure and higher flexural strengths than MCMB. Because of the filling and bonding effects of SFMP on MCMB bulks, addition of SFMP, albeit a little, can greatly increase the flexural strengths of sintered bulks of MCMB. However, adding MCMB, even a slight amount, into SFMP can severely impair the flexural strength of sintered bulks. This might be attributed to both the crack initiation along the boundaries between MCMB and SFMP and the formation of layered texture of MCMB sphere.LI Tong-qi HU Zi-jun WANG Jun-shan GUO Yu-ming WANG Cheng-yang 2006Chinese Journal of Aeronautics2006,19,B12:0
17Effect of ZrO_2 Dopant on the Sintering Behavior and Performance of MCMB-derived Carbon Laminations显示文摘Liquid ball-milling dispersant method was used to prepare the ZrO2-doped carbon laminations from mesocarbon microbeads(MCMBs). After sintering at 1 300 ℃ in nitrogen atmosphere, the effect of ZrO2 concentration on sintering behavior, electric conductivity as well as bending strength of the carbon laminations was investigated in detail. The results showed that the volumetric shrinkage rate of the carbon laminations decreased from 38.2% to 30.9% when the ZrO2 concentration in raw materials varied from 0 to 16 wt%. Compared with undoped carbon lamination, the samples had high-electric conductivity and excellent bending strength in all cases. The electric conductivity achieved the maximum value of 225 S/cm, and the bending strength of the carbon lamination was 119.24 MPa for a concentration of 8 wt% ZrO2 in raw materials. In addition, the electric conductivity and bending strength reducing were observed when the ZrO2 concentration was higher than 8 wt%. The catalytic effect on graphitization for the carbon laminations was the most effective when the ZrO2 concentration was set at 8 wt% in raw materials.王茂华 2011Journal of Wuhan University of Technology(Materials Science)2011,26,1:0
18杉杉:只剩下一块牌子?显示文摘在经历了业绩的大幅滑落后,郑永刚寄望于一个全新的品牌提升战略。这位昔日的服装业老大开始涉足电池科技、房地产、生物技术,他的市场策略能够挽救杉杉吗?吴金勇 2002商务周刊2002,,18:0
19锂离子电池用Sn-MCMB复合材料碳热还原合成的研究显示文摘用碳热还原法制备了Sn-MCMB复合材料,通过XRD、SEM、恒流充放电循环和慢速扫描循环伏安(CV)等方法对其电化学嵌脱锂性能做了研究。结果表明:SnO2被MCMB还原成金属Sn圆球颗粒,吸附在McMB上的球径平均尺寸为500nm,而未吸附的为15μm,均匀分散在MCMB微球之间。该材料的首次嵌脱锂比容量分别可以达到892和657mAh/g,库仑效率为73%,循环14周以后的脱锂比容量为366mAh/g。李艳红 吴锋 吴川 白莹 2007功能材料2007,38,A04:0
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