1 Introduction Salt lakes are widely distributed in the western of China,especially in the area of Qinghai-Xizang(Tibet)Plateau.A series of salt lakes in the Qaidam Basin,located in Qinghai Province,China,is famous fo...1 Introduction Salt lakes are widely distributed in the western of China,especially in the area of Qinghai-Xizang(Tibet)Plateau.A series of salt lakes in the Qaidam Basin,located in Qinghai Province,China,is famous for their abundance of lithium,potassium and boron resources(Zheng et al,1988;Deng et al,2012).It is well known that the展开更多
Li4Ti5O12 has been noticed about a negative electrode of a high powered and safe lithium ion secondary battery. These properties require single phase, high crystallization, larger specific surface area and fine nanopa...Li4Ti5O12 has been noticed about a negative electrode of a high powered and safe lithium ion secondary battery. These properties require single phase, high crystallization, larger specific surface area and fine nanoparticles. This study carried out the noble synthesis of Li4Ti5O12 using a solid phase synthesis by two steps sintering. These results showed Li4Ti5O12 of 6.1 m2·g-1?and diameter of 110 nm with the single phase and high crystallization. Li2TiO3 will play an important role in this reaction, obtained by pre-sintering as a precursor.展开更多
The lithiation behavior of LiFePO4 in saturated LiNO3 solution is investigated by analyses of cyclic voltammetry(CV), potentiostatic intermittent titration(PITT) and electrochemical impedance spectra(EIS), The results...The lithiation behavior of LiFePO4 in saturated LiNO3 solution is investigated by analyses of cyclic voltammetry(CV), potentiostatic intermittent titration(PITT) and electrochemical impedance spectra(EIS), The results show that LiFePO4 has good electrochemical reversibility in saturated LiNO3 solution. The lithium diffusion coefficients measured by PITT vary with potential, get its lowest value at the beginning of phase transition. EIS show that phase transition will baffle lithium diffusion in electrode.展开更多
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
基金Financial support from the NSFCs (21106103, 21276194 and 21306136)the Specialized Research Funds for the Doctoral Program of Chinese Higher Education (20101208110003, 20111208120003)+1 种基金the Natural Science Foundation of Tianjin (12JCQNJC03400)Senior Professor Program for TUST (20100405)
文摘1 Introduction Salt lakes are widely distributed in the western of China,especially in the area of Qinghai-Xizang(Tibet)Plateau.A series of salt lakes in the Qaidam Basin,located in Qinghai Province,China,is famous for their abundance of lithium,potassium and boron resources(Zheng et al,1988;Deng et al,2012).It is well known that the
文摘Li4Ti5O12 has been noticed about a negative electrode of a high powered and safe lithium ion secondary battery. These properties require single phase, high crystallization, larger specific surface area and fine nanoparticles. This study carried out the noble synthesis of Li4Ti5O12 using a solid phase synthesis by two steps sintering. These results showed Li4Ti5O12 of 6.1 m2·g-1?and diameter of 110 nm with the single phase and high crystallization. Li2TiO3 will play an important role in this reaction, obtained by pre-sintering as a precursor.
文摘The lithiation behavior of LiFePO4 in saturated LiNO3 solution is investigated by analyses of cyclic voltammetry(CV), potentiostatic intermittent titration(PITT) and electrochemical impedance spectra(EIS), The results show that LiFePO4 has good electrochemical reversibility in saturated LiNO3 solution. The lithium diffusion coefficients measured by PITT vary with potential, get its lowest value at the beginning of phase transition. EIS show that phase transition will baffle lithium diffusion in electrode.
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.
