【摘要】 用柠檬酸溶胶－凝胶工艺制备出了ＬｉＶ３Ｏ８化合物，并检测了其作为热电池阴极材料时的放电性能。干凝胶２１０℃熔烧所得的粉末颗粒疏松多孔，３００℃时可变成结晶岩状，低温焙烧时出现了Ｌｉ0．3Ｖ2Ｏ５和ＬｉＶ２Ｏ５相经６５０℃长时间保温后可转交为 ＬｉＶ３Ｏ８。模拟 Ｌｉ－Ｂ／ＬｉＣｌ－ＫＣｌ／ＬｉＶ３Ｏ８（或 Ｖ２Ｏ５）热电池５００℃放电试验表明，ＬｉＶ３Ｏ８因具有良好的电子导电体和较低的Ｌｉ＋扩散极化，其放电较 Ｖ２Ｏ５平稳，虽峰值电压略有降低，但可利用的比容量（电压降至峰值电压的７５％或２．０Ｖ）均不低于Ｖ２Ｏ５；ＬｉＶ３Ｏ８中掺入８％的Ｐ２Ｏ５时可提高小电流放电时的电压。更多还原

【Abstract】 Compound LiV3O8 has been synthesised by citric acid sol-gel process and it’s discharge behavior has also been investigated as a kind of cathode materials for thermal battery. The particles, obtained from dry-gel baked at 210℃, are porous and can be turned to crystalline state at 300℃. Li0.3V2O5 and LiV2O5 phases that appear at the lower temperature can be changed to LiV2O8 after exposed at 650℃ for a long time. Discharge tests at 500℃ by simulating Li-B/LiCl-KCl/LiV3O8(or V2O5) thermal cells, show that LiV3O8 discharges more steadily than that of V2O5 because of having better electron-conductibility and lower diffusion polarizability for lithium ion, and that the usable specific capacities for LiV3O8, corresponding to 75 % of Peak-voltage or 2. 0V, are not lower than that for V2O5, even with a reduced peak-voltage. Addition of 8% Of P2O5 to LiV3O5 can increase discharge voltage at lower current density.更多还原