(1. 中山大學(xué) 物理科學(xué)與工程技術(shù)學(xué)院，廣州 510275；
2. 江門三捷電池實(shí)業(yè)有限公司 博士后工作站，江門 529000；
3. 東北大學(xué) 材料與冶金學(xué)院，沈陽(yáng) 110004)
摘 要: 采用恒電位間歇滴定法(PITT)和電化學(xué)阻抗譜技術(shù)(EIS)測(cè)定鋰離子電池正極材料LiFePO4中Li+擴(kuò)散系數(shù)。結(jié)果表明：隨著嵌鋰量的變化，鋰離子的擴(kuò)散系數(shù)(
關(guān)鍵字: LiFePO4; 擴(kuò)散系數(shù); PITT; EIS
（1. School of Physics and Engineering, Sun Yat-Sen University,Guangzhou 510275, China;
2. Postdoctoral Workstation, Jiangmen JJJ Battery Co. Ltd.,Jiangmen 529000, China;
3. School of Materials and Metallurgy, Northeastern University,Shenyang 110004, China）
Abstract:The chemical diffusion coefficient of Li-ion in LiFePO4 cathode material was measured by potentiostatic intermittent titration technique (PITT) and electrochemical impedance spectrum (EIS). The results show that the diffusion coefficient ranges in 10−13−10−16 cm2/s. With the change of Li content the diffusion coefficient appears an extremely large value firstly, latter appears a minimum, then increases. The calculated values by PITT are in agreement with those by EIS.
Key words: LiFePO4; diffusion coefficient; potentiostatic intermittent titration technique(PITT); electrochemical impedance spectrum(EIS)
