用高分子分散及微波-固相复合加热技术合成了层状锂离子电池正极材料L iN i0.5Co0.5O2.采用循环伏安、充放电循环、扫描电子显微镜(SEM)以及X射线粉末衍射(XRD)等测试技术,研究了煅烧条件对材料微观形貌、相结构以及电化学性能的影响规...用高分子分散及微波-固相复合加热技术合成了层状锂离子电池正极材料L iN i0.5Co0.5O2.采用循环伏安、充放电循环、扫描电子显微镜(SEM)以及X射线粉末衍射(XRD)等测试技术,研究了煅烧条件对材料微观形貌、相结构以及电化学性能的影响规律.研究结果表明:在750℃煅烧4 h即可得到形状为类球形的纯相层状L iN i0.5Co0.5O2正极材料,该材料的最大放电容量达到154 mA.h/g,循环10周后放电容量仍保持在148 mA.h/g以上.展开更多
The desulfurater(BaAl2O4) was successfully synthesized with BaCO3 and Al(OH)3 powders as raw materials by microwave sintering method.The mass loss of raw materials and the characterization of the outcome were investig...The desulfurater(BaAl2O4) was successfully synthesized with BaCO3 and Al(OH)3 powders as raw materials by microwave sintering method.The mass loss of raw materials and the characterization of the outcome were investigated by means of TG-DSC,XRD and optical microscopy.The reaction mechanism was discussed.The experimental results show that synthesized BaAl2O4 by microwave sintering method is feasible.Compared with conventional sintering method,microwave sintering is a better way to synthesize BaAl2O4 with advantages of low temperature sintering,short time sintering and high synthesis rate.展开更多
Pure Ca-SiAlON:Eu2+ was synthesized by microwave sintering method at a relatively low temperature of 1550℃.Photoluminescence intensity of the resultant phosphor was higher than those of the samples synthesized by con...Pure Ca-SiAlON:Eu2+ was synthesized by microwave sintering method at a relatively low temperature of 1550℃.Photoluminescence intensity of the resultant phosphor was higher than those of the samples synthesized by conventional gas-pressure sintering technique at 1750℃.When it was excited at 450 nm,the as-prepared yellow Ca-SiAlON:Eu2+ sample had an external quantum efficiency of 42%,comparable to the sample synthesized at 1750℃ under 0.5 MPaN2 gas pressure by the GPS method reported in reference.The experimental results demonstrated that the microwave sintering method was also an interesting approach for synthesizing nitride phosphors,which promises lower firing temperature than those by carbothermal reduction and nitridation (CRN) methods,higher heating rate and shorter duration time compared with those by gas-pressure sintering.展开更多
文摘用高分子分散及微波-固相复合加热技术合成了层状锂离子电池正极材料L iN i0.5Co0.5O2.采用循环伏安、充放电循环、扫描电子显微镜(SEM)以及X射线粉末衍射(XRD)等测试技术,研究了煅烧条件对材料微观形貌、相结构以及电化学性能的影响规律.研究结果表明:在750℃煅烧4 h即可得到形状为类球形的纯相层状L iN i0.5Co0.5O2正极材料,该材料的最大放电容量达到154 mA.h/g,循环10周后放电容量仍保持在148 mA.h/g以上.
基金Project(50264001) supported by the National Natural Science Foundation of ChinaProject(QKH-J-2008-2009) supported by Guizhou Science and Technology Department, China
文摘The desulfurater(BaAl2O4) was successfully synthesized with BaCO3 and Al(OH)3 powders as raw materials by microwave sintering method.The mass loss of raw materials and the characterization of the outcome were investigated by means of TG-DSC,XRD and optical microscopy.The reaction mechanism was discussed.The experimental results show that synthesized BaAl2O4 by microwave sintering method is feasible.Compared with conventional sintering method,microwave sintering is a better way to synthesize BaAl2O4 with advantages of low temperature sintering,short time sintering and high synthesis rate.
基金supported by the National Natural Science Foundation of China(51102252 and 51272259)the Special Foundation for Young Scientists of Zhejiang Province(R12E020005)
文摘Pure Ca-SiAlON:Eu2+ was synthesized by microwave sintering method at a relatively low temperature of 1550℃.Photoluminescence intensity of the resultant phosphor was higher than those of the samples synthesized by conventional gas-pressure sintering technique at 1750℃.When it was excited at 450 nm,the as-prepared yellow Ca-SiAlON:Eu2+ sample had an external quantum efficiency of 42%,comparable to the sample synthesized at 1750℃ under 0.5 MPaN2 gas pressure by the GPS method reported in reference.The experimental results demonstrated that the microwave sintering method was also an interesting approach for synthesizing nitride phosphors,which promises lower firing temperature than those by carbothermal reduction and nitridation (CRN) methods,higher heating rate and shorter duration time compared with those by gas-pressure sintering.