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
Rare earth mineral fast ion conductors of Li 1+2 x+3y Al x Sc y Zn y Ti 2- x-2y Si x P 3- x O 12 system based on LiTi 2(PO 4) 3 were prepared by solid phase reaction at hig...Rare earth mineral fast ion conductors of Li 1+2 x+3y Al x Sc y Zn y Ti 2- x-2y Si x P 3- x O 12 system based on LiTi 2(PO 4) 3 were prepared by solid phase reaction at high temperature (1000～1300 ℃) for about 30 h using refined natural kaolinite and Sc 2O 3. The X ray diffraction analysis shows that a Nasicon like structure with R3c space group can be found in the composition range of x =0.1, 0.2, y ≤0.2. The maximum lithium ion conductivity is 1.19×10 -4 S·cm -1 for the composition with x =0.1, y =0.08 at room temperature, and its activation energy is 30.6 kJ·mol -1 in the temperature range of 150～300 ℃. The systems with these compositions have high conductivity of about 10 -2 S·cm -1 at 300 ℃.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Rare earth mineral fast ion conductors of Li 1+2 x+3y Al x Sc y Zn y Ti 2- x-2y Si x P 3- x O 12 system based on LiTi 2(PO 4) 3 were prepared by solid phase reaction at high temperature (1000～1300 ℃) for about 30 h using refined natural kaolinite and Sc 2O 3. The X ray diffraction analysis shows that a Nasicon like structure with R3c space group can be found in the composition range of x =0.1, 0.2, y ≤0.2. The maximum lithium ion conductivity is 1.19×10 -4 S·cm -1 for the composition with x =0.1, y =0.08 at room temperature, and its activation energy is 30.6 kJ·mol -1 in the temperature range of 150～300 ℃. The systems with these compositions have high conductivity of about 10 -2 S·cm -1 at 300 ℃.
