Wang C.
,
Yang H.T.
,
Li X.
,
Zheng Y.F.
材料科学技术（英）
doi:10.1016/j.jmst.2016.06.003
In this work, three widely used commercial Zn alloys (ZA4-1, ZA4-3, ZA6-1) were purchased and prepared by hot extrusion at 200?°C. The microstructure, mechanical properties, corrosion behaviors, biocompatibility and hemocompatibility of Zn alloys were studied with pure Zn as control. Commercial Zn alloys demonstrated increased strength and superb elongation compared with pure Zn. Accelerated corrosion rates and uniform corrosion morphologies were observed in terms of commercial Zn alloys due to galvanic effects between Zn matrix and α-Al phases. 100% extracts of ZA4-1 and ZA6-1 alloys showed mild cytotoxicity while 50% extracts of all samples displayed good biocompatibility. Retardant cell cycle and inhibited stress fibers expression were observed induced by high concentration of Zn2+ releasing during corrosion. The hemolysis ratios of Zn alloys were lower than 1% while the adhered platelets showed slightly activated morphologies. In general, commercial Zn alloys possess promising mechanical properties, appropriate corrosion rates, significantly improved biocompatibility and good hemocompatibility in comparison to pure Zn. It is feasible to develop biodegradable metals based on commercial Zn alloys.
关键词:
Commercial Zn alloys
,
Biodegradable metals
,
Mechanical properties
,
Corrosion behaviors
,
Cytotoxicity
,
Hemocompatibility
许天才
,
彭晓东
,
张玺
,
陈元芳
,
姜军伟
,
陈洁
功能材料
doi:10.3969/j.issn.1001-9731.2014.07.013
利用光学显微镜(OM)、扫描电子显微镜(SEM)、X 射线衍射仪(XRD)分析了 Li 元素对 Mg-x Li-3Al 合金组织的影响,并用电子万能试验机测试合金的拉伸性能.结果表明,Li 含量的变化可以明显改变合金的相组成.当 m (Li)＜5．7％(质量分数)时合金由单一α-Mg 相组成；Li 含量在5．7％~10．3％(质量分数)之间时,合金为α-Mg＋β-Li 双相；m (Li)＞10．3％(质量分数)时合金为单一β-Li 相.合金的塑性随 Li 含量的升高而增加,铸态 LA113合金的延伸率高达37．36％,但挤压态下合金强度随 Li 含量升高而降低,挤压态 LA53合金具有最佳抗拉强度,达到263．28 MPa.当 Li 含量升高,合金中的第二相粒子会出现 Al12 Mg17转变为 LiMgAl2.
关键词:
镁锂合金
,
铸态
,
挤压态
,
微观组织
,
拉伸性能
陈瑞福
,
王文继
无机材料学报
Li1+2x+yAlxNdyTi2-x-ySixP3-xO12 锂快离子导体（以下简称Al-Nd-Lisicon）可以用精选的天然高岭石Al4[Si4O10]（OH）8为起始原料，经与Li2CO3、TiO2、NH4H2PO4进行高温（800～1000℃）固相反应约20h而制得.一个空间群属于R3c的固溶体导电相可在y=0．5，x≤0.3和y=1.0，x≤0．4的组成范围内发现.该相具有较好的电导性和较低的活化能．起始组成y=1．0,x=0．3的合成物具有最高的电导率，在400℃时；其电导率达到3．08×10-2S／cm，离子导电激活能为35．2kJ／mol.
关键词:
矿物快离子导体
,
null
,
null
Y.H. Wei
,
L.Q. Hu
,
L.S. Jian
,
L. Lu and B.S. Xu College of Materials Science and Engineering
,
Taiyuan University of Technology
,
Taiyuan 030024
,
China
金属学报(英文版)
Theinitialstageofagingtransformationin Al 2 27% Li 2 68 % Cu 0 11% Zr 0 13% Ceal loy at100℃wasstudied by meansof x ray diffraction.It wasconcludedthatordering of Liatom happens whenthealloyissolution treated andquenched, and beforetheformationofδ’ phasethereexitscontinuous phasetransformation processes, namely ordering ,spinodal de composition and both coexistence. Gunier Preston zone was not found in the aging process ofthestudied alloy.
关键词:
Al Li Cu Zr alloy
,
null
,
null
,
null
,
null
张玉荣
,
王文继
功能材料
以LiTi2(PO4)3为基以天然高岭石为起始原料,经高温固相反应(～900℃)制得了一系列新的锂快离子导体材料Li1+2x+ 2yAlxMgyTi2-x-ySixP3-xO1 2(以下简称Ti-Mg-Lisicon).系统的合成温度随x和y值的增大而降低.应用交流阻抗技术测定的电导率数据结果表明x=0.1,y=0.1的合成物的室温电导率最好为1.01×10-4S/cm,而400℃时x=0.1,y=0.3的合成物的电导率最大,为2.53×10-2S/cm.XRD分析结果表明在x=0.1,y≤0.8;x=0.2,y≤0.6的组成范围内均能得到空间群为R3c的合成物.
关键词:
锂快离子导体
,
Ti-Mg-Lisicon
,
高岭石
张玉荣
,
王文继
无机材料学报
doi:10.3321/j.issn:1000-324X.2001.01.019
以LiTi2(PO4)3为基以天然高岭石为起始原料，经高温固相反应(9501150C)制得了一系列锂快离子导体材料Li1+2x+yAlxYbyTi2-x-ySixP3-xO12(以下简称Al-Yb-Lisicon). 系统的合成温度随x和y值的增大而降低. 应用交流阻抗技术测定的电导率数据结果表明y=0.3，x=0.1的合成物的电导率最好，400C时电导率达2.4510-2S/cm，200400C内的电导激活能为38.3kJ/mol. XRD分析结果表明在y=0.3，x0.4及y=0.5，x0.3的组成范围内均能得到空间群为R3c的合成物.
关键词:
锂快离子导体
,
Al-Yb-Lisicon
,
高岭石
Journal of Alloys and Compounds
The formation of impurity Li(x)Ni(1-x)O when synthesizing spinel LiNi(0.5)Mn(1.5)O(4) using solid state reaction method, and its influence on the electrochemical properties of product LiNi(0.5)Mn(1.5)O(4) were studied. The secondary phase LixNi(1-x)O emerges at high temperature due to oxygen deficiency for LiNi(0.5)Mn(1.5)O(4) and partial reduction of Mn(4+) to Mn(3+) in LiNi(0.5)Mn(1.5)O(4). Annealing process can diminish oxygen deficiency and inhibit impurity Li(x)Ni(1-x)O. The impurity reduces the specific capacity of product, but it does not have obvious negative effect on cycle performance of product. The capacity of LiNi(0.5)Mn(1.5)O(4) that contains Li(x)Ni(1-x)O can deliver about 120 mAhg(-1). (C) 2011 Elsevier B.V. All rights reserved.
关键词:
Lithium ion batteries;LiNi(0.5)Mn(1.5)O(4);Impurity Li(x)Ni(1-x)O;Electrochemical properties;lithium batteries;rate capability;spinel;performance
任海伦
,
戴永年
,
姚耀春
,
李伟宏
无机材料学报
doi:10.3724/SP.J.1077.2006.00627
采用固相法合成锂离子正极材料尖晶石相Li1.02CoxCryMn2-x-yO4, 研究元素Co、Cr不同掺杂量对产物的结构、晶胞常数、电化学性能和电池内阻的影响. 分析表明, 掺杂少量的Co、Cr的LiMn2O4依然保持着尖晶石结构; 晶胞常数随掺杂量的增加而减小, 从而使尖晶石的比表面积增大, 有利于提高电池的初始容量; 并有效地抑制了充放电过程中的Jahn-Teller效应和Mn3+的歧化反应. 掺杂Co、Cr后Li1.02MnO4初始容量有所下降, 且随掺杂量增加而减小, 但能明显改善材料的循环性能.
关键词:
固相法
,
doping Cr and Co
,
electrochemical performance
,
AC impedance
任海伦
,
戴永年
,
姚耀春
,
李伟宏
无机材料学报
doi:10.3321/j.issn:1000-324X.2006.03.018
采用固相法合成锂离子正极材料尖晶石相Li1.02CoxCryMn2-x-yO4,研究元素Co、Cr不同掺杂量对产物的结构、晶胞常数、电化学性能和电池内阻的影响.分析表明,掺杂少量的Co、Cr的LiMn2O4依然保持着尖晶石结构;晶胞常数随掺杂量的增加而减小,从而使尖晶石的比表面积增大,有利于提高电池的初始容量;并有效地抑制了充放电过程中的Jahn-Teller效应和Mn3+的歧化反应.掺杂Co、Cr后Li1.02MnO4初始容量有所下降,且随掺杂量增加而减小,但能明显改善材料的循环性能.
关键词:
固相法
,
Co、Cr掺杂
,
电化学性能
,
交流阻抗
李佳
,
杨传铮
,
张建
,
更保佳
,
高学峰
稀有金属材料与工程
介绍了作者提出的一种分析与研究锂离子电池正极活性材料Li(Ni,Me)O2 (Me=Co,Mn或Co+Mn)中Li/Ni在3a/3b位混合占位的新方法,即根据Li(Ni,Me)O2的混合占位模型,借助Powder Cell 1.0计算程序模拟计算得到X射线衍射强度比与混合占位参数x的线性关系,根据实验测得的X射线衍射强度比和此线性关系方程,求得对应的混合占位参数x.把这种方法用于不同成分相关材料混合占位的理论模拟,得到5种材料衍射强度比的平方根与混合占位参数x之间的线性关系；把这些线性方程应用于实际材料Li(Ni0.6Co0.2Mn0.2)O2的合成时,获得了混合占位参数x与材料焙烧处理温度之间的关系；同时还用这种方法研究了2H-石墨/Li(Ni1/3Co1/3Mn1/3)O2电池在充放电过程中Li(Ni1/3Co1/3Mn1/3)O2晶体结构和微结构的变化.
关键词:
锂离子电池
,
正极活性材料
,
Li/Ni原子混合占位
,
X射线衍射
