New lithium fast ion conductors of Li1.2 ＋ x - y Yx Ti1.9 - x Al0.1Si0. 1Wy P2.9 - y O12 based on LiTi2（PO4）3 were prepared by high temperature solid state reaction using refined natural kaolinite as a starting mat...New lithium fast ion conductors of Li1.2 ＋ x - y Yx Ti1.9 - x Al0.1Si0. 1Wy P2.9 - y O12 based on LiTi2（PO4）3 were prepared by high temperature solid state reaction using refined natural kaolinite as a starting material. X-ray powder diffraction analysis indicates that a phase with Nasieon-like structure exists together with other phases in the composition range of x =0.1, y≤0.2 and x =0.2,y ≤0.2. AC impedance measurements show that the initial composition with x = 0.10, y = 0.10 possesses the highest ionic conductivity of 1.65 × 10^-5 S·cm^-1 at room temperature, while the sample with initial composition of x =0.20, y =0.10 has the best ionic conductivity of 6. 53 × 10^-3S·cm^-1 at 573 K and decomposes at 3.0 V.展开更多
Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x In y Ti 1-2 y P y O 3 system were prepared by solid state reaction. X ray powder diffraction shows that perovskite solid...Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x In y Ti 1-2 y P y O 3 system were prepared by solid state reaction. X ray powder diffraction shows that perovskite solid solution forms in the ranges of x =0.10～0.12, y ≤0.2. AC impedance measurements indicate that the bulk conductivities and the total conductivities are of 1×10 -4 and 1× 10 -5 S·cm -1 at 25 ℃ respectively. The compositions have low bulk activation energies of 20 kJ·mol -1 in the temperature ranges of 298～523 K and total activation energies of 40 kJ·mol -1 in the temperature ranges of 298～623 K.展开更多
Natural layered aluminosilicate Kaolinite Al 4[Si 4O 10 ](OH) 8 has been used as a starting material for preparing a new system of lithium fast ion conductors by high temperature(1073—1223 K) solid state react...Natural layered aluminosilicate Kaolinite Al 4[Si 4O 10 ](OH) 8 has been used as a starting material for preparing a new system of lithium fast ion conductors by high temperature(1073—1223 K) solid state reactions. X ray powder diffraction and a.c. impedance technique were used to characterize the compositions of the Li 1+2 x Al x Zr 2- x Si x P 3- x O 12 system. A single pure solid solution phase with R3c space group can be formed in the composition range of x ≤0 4. A specimen with x =0 3 possesses a maximum ionic conductivity which reaches up to 1 03×10 -2 s/cm at 723 K and the activation energy is 29 63 kJ/mol.展开更多
以LiTi2(PO4)3为母体,以天然高岭石为起始原料,经高温固相反应制得了一系列新的锂快离子导体Li1.2+x-yYxTi1.9-xAl0.1Si0.1SyP2.9-yO12(以下简称Y S Lisicon)。X射线粉末衍射分析结果表明在x≤0.3,y<(0.2+x)的组成范围内均能得到类似...以LiTi2(PO4)3为母体,以天然高岭石为起始原料,经高温固相反应制得了一系列新的锂快离子导体Li1.2+x-yYxTi1.9-xAl0.1Si0.1SyP2.9-yO12(以下简称Y S Lisicon)。X射线粉末衍射分析结果表明在x≤0.3,y<(0.2+x)的组成范围内均能得到类似于Nasicon三方结构的相,同时还存在其他杂相。应用交流阻抗技术测定电导率的结果表明起始组成为x=0.1,y=0.15的合成物电导率最高,其在室温下的电导率为2.93×10-5S·cm-1,在673K时可达3.62×10-2S·cm-1,其在473～673K间的活化能为37.19kJ·mol-1,分解电压为3.0V。展开更多
文摘New lithium fast ion conductors of Li1.2 ＋ x - y Yx Ti1.9 - x Al0.1Si0. 1Wy P2.9 - y O12 based on LiTi2（PO4）3 were prepared by high temperature solid state reaction using refined natural kaolinite as a starting material. X-ray powder diffraction analysis indicates that a phase with Nasieon-like structure exists together with other phases in the composition range of x =0.1, y≤0.2 and x =0.2,y ≤0.2. AC impedance measurements show that the initial composition with x = 0.10, y = 0.10 possesses the highest ionic conductivity of 1.65 × 10^-5 S·cm^-1 at room temperature, while the sample with initial composition of x =0.20, y =0.10 has the best ionic conductivity of 6. 53 × 10^-3S·cm^-1 at 573 K and decomposes at 3.0 V.
文摘Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x In y Ti 1-2 y P y O 3 system were prepared by solid state reaction. X ray powder diffraction shows that perovskite solid solution forms in the ranges of x =0.10～0.12, y ≤0.2. AC impedance measurements indicate that the bulk conductivities and the total conductivities are of 1×10 -4 and 1× 10 -5 S·cm -1 at 25 ℃ respectively. The compositions have low bulk activation energies of 20 kJ·mol -1 in the temperature ranges of 298～523 K and total activation energies of 40 kJ·mol -1 in the temperature ranges of 298～623 K.
文摘Natural layered aluminosilicate Kaolinite Al 4[Si 4O 10 ](OH) 8 has been used as a starting material for preparing a new system of lithium fast ion conductors by high temperature(1073—1223 K) solid state reactions. X ray powder diffraction and a.c. impedance technique were used to characterize the compositions of the Li 1+2 x Al x Zr 2- x Si x P 3- x O 12 system. A single pure solid solution phase with R3c space group can be formed in the composition range of x ≤0 4. A specimen with x =0 3 possesses a maximum ionic conductivity which reaches up to 1 03×10 -2 s/cm at 723 K and the activation energy is 29 63 kJ/mol.
文摘以LiTi2(PO4)3为母体,以天然高岭石为起始原料,经高温固相反应制得了一系列新的锂快离子导体Li1.2+x-yYxTi1.9-xAl0.1Si0.1SyP2.9-yO12(以下简称Y S Lisicon)。X射线粉末衍射分析结果表明在x≤0.3,y<(0.2+x)的组成范围内均能得到类似于Nasicon三方结构的相,同时还存在其他杂相。应用交流阻抗技术测定电导率的结果表明起始组成为x=0.1,y=0.15的合成物电导率最高,其在室温下的电导率为2.93×10-5S·cm-1,在673K时可达3.62×10-2S·cm-1,其在473～673K间的活化能为37.19kJ·mol-1,分解电压为3.0V。
