电动汽车动力电池磷酸铁锂正极材料制备与应用.ppt

电动汽车动力电池磷酸铁锂正极材料制备与应用 Active materials Electrolyte Separator Active material for cathode in lithium-ion battery Layered Structure: LiCoO2, LiNiO2, LiMnO2, LiNixCoyMnzO2 Spinel Structure: LiMn2O4 Olive Structure: LiFePO4 Modified： LiNiO2 LiNi0.8Co0.2O2 LiMnO2 LiNi1/3Co1/3Mn1/3O2 LiFePO4 cathode materials Advantage: High specific capacity 170mAh/g Abundant source and low cost Environment benign Thermal stability in the fully charged state Good electrochemical performance Synthesis routes for LiFePO4 1. Solid state reactions at high temperature Li2CO3+2Fe(CH3COO)2+2NH4H2PO4→2LiFePO4+4NH3+CO2+5H2O+2CH3COOH 2.Co-precipitation in aqueous medium Adding LiOH into a solution containing Fe2+ and phosphoric acid，the obtained precipitate was dried under vacuum and heat-treated at 550 ℃ for 12 h under inert atmosphere. Co-precipitation of Fe3(PO4)2?5H2O and Li3PO4 650-800℃ 12h; 160 mAh/g (C/20) 3. Hydrothermal synthesis FeSO4，H3PO4 and LiOH 120℃，5 h Fe3(PO4)2?5H2O and Li3PO4, 220℃, 24bar 1h; 120 mAh/g(C/20)(5%C) 4. Sol-gel method Adding LiOH and Fe(NO3)3 to ascorbic acid then to H3PO4, 350 ℃12h, 800 ℃24h; 110 mAh/g(C/20) 5.Mechanochemical activation Fe3(PO4)2?5H2O and Li3PO4;160 mAh/g(C/20) (5%C) Novel routes for LiFePO4 Production-1 Novel routes for LiFePO4 Production-2 PPy-LiFePO4/C ( C: 2.4wt%, PPy : 5wt%) LiFePO4/C (valance sample) Low-temperature performance of LiFePO4/C Shanghai Jiao Tong University Institute of Electrochemical Energy Technology Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China zfma@sjtu.edu.cn Zi-Feng Ma Preparation and Application of the LiFePO4 Cathode Materials for Lithium Ion Battery Abstract:动力电池是发展电动汽车的核心。发展电动汽车用低成本高密度蓄电体系，必须开展深入细致的基础科学问题研究。 本报告将介绍中国开展的973计划电动汽车蓄电体系项目中在锂离子电池正极材料研究情况，重点介绍磷酸铁锂正极材料制备过程工程特性，高低温性能改进工艺及车用磷酸铁锂电池设计制作与示范情况。 马紫峰 教授（上海交通大学，中国） 上海交通大学化学工程学教授，能源研究院副院长，电化学与能源技术研究所所长，中国科技部“973计划”计划“电动汽车用低成本高密度蓄电（氢）体系基础科学问题研究”项目首席科学家。主要从事锂离子电池、燃