LI Junzhe ^{1, 4, 5}, LUO Shaohua ^{2, 3, 4}, HAO Aiming ^{2, 3, 4}, WANG Yingling ^{1, 3, 4}, LI Xian ³, DING Xueyong ¹, HE Ping ⁵
(1. School of Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China; 2. School of Materials Science and
Engineering, Northeastern University, Shenyang 110004, Liaoning, China; 3. School of Resources and Materials, Northeastern
University at Qinhuangdao, Qinhuangdao 066004, Shandong, China; 4. Hebei Key Laboratory of Dielectric and Electrolyte Functional
Material, Qinhuangdao 066004, Hebei, China; 5. Metallurgical Technology Research Department, Central Iron & Steel Research
Institute, Beijing 100081, China)

Abstract: AAO templates were fabricated by a two-step anodization procedure. LiAlO2 which acted as the conductor of lithium-ion rapid transmission was prepared with AAO and LiNO₃ by hydrothermal method. Subsequently, LiFePO₄/LiAlO₂ composite cathode materials were synthesized via sol-gel method with the precursor of LiFePO₄. The structure, morphology and electrochemical properties of the composite cathode materials were analyzed by XRD, SEM and electrochemical performance measurement. The optimum experimental conditions for the precursor LiAl(OH)₄·H₂O synthesized from AAO by hydrothermal method were obtained with the discharge capacity of the composite cathode materials as the target. The results show that the reaction temperature is 220 ℃, the reaction time is 48 h and the reactant molar ratio is n(Al):n(Li)=1:3. The α-LiAlO₂ phase is obtained when the precursor is calcined at 800 ℃, the specific discharge capacity of LiFePO₄/3wt.%LiAlO₂ composite cathode materials is up to 130 mAh/g after 10 charge-discharge cycles at 0.1C rate.

Key words: AAO template; hydrothermal; LiAlO₂; LiFePO₄; electrochemical performance