【摘要】 本文利用电化学方法测定了薄膜电极Li_xTiO₂中锂离子的化学扩散系数,室温下其数量级为10^-11～10^-12cm²·S^-1（x=0.10～0.20）。通过D₄-T关系,测得其扩散激活能E（?）0.59eV,频率因子D₀（?）O.54cm²·s^-1.故其一般式可表为:D₄=O.54exp（-6785/T）cm²·s^-1（t=15～50℃）.利用D₄值和库仑滴定曲线测得了Li⁺在Li_xTiO₂薄膜电极中的迁移率和电导率分别为10^-10cm²·V^-1·s^-1和10^-7～10^-8Ω^-1·cm^-1数量级。比较了Li_xTiO₂体系与其他锂嵌入物的D₄值,发现其与隧道化合物Li_xWO₃的D₄值相近,而比层状化合物Li_xTiS₂的D₄值小3～4个数量级。D₄值较大的嵌入物在作为锂电池的正极时,可以经受较大的充放电流。更多还原

【Abstract】 The diffusion of interstitial Li⁺ in intercalated compound Li_xTiO₂ was measured by means of a variety of electrochemical techniques,namely,the potential step,the galvanostatic and the potential sweep techniques.At room temperature the chemical diffusion coefficient （D） of Li⁺ in Li_xTiO₂ was found to be 10^-11～10^-12 cm²·s^-1 （x=0.10～0.20）.D may be expressed byD=D_o exp （-E/RT） with E（?）0.59eV and D_o（?）0.54cm²·s^-1 over a temperature range of 15～50℃.Furthermore,the mobility and the conductivity of Li⁺ in Li_xTiO₂ （x=0.10～0.20） were found to be approximately 10^-（10）cm²·V^-1·s^-1 and 10^-7～10^-8 Ω^-1cm^-1 respectively.更多还原