【作者】 杨改； 蔡飞鹏； 高金华； 王建梅； 王波； 许敏；

【Author】 YANG Gai,CAI Fei-peng,GAO Jin-hua,WANG Jian-mei,WANG Bo,XU Min (Energy Research Institute of Shandong Academy of Sciences,Key Laboratory for Biomass Gasification Technology of Shandong Province,Jinan 250014,China)

【机构】 山东省科学院能源研究所山东省生物质气化技术重点实验室；

【摘要】 纳米磷酸铁锂（LiFePO₄）正极材料具有颗粒小、比表面积大的优势,可有效改善材料动力学特性,但较差的加工性能使其发展受限。本文采用溶胶-凝胶制备纳米磷酸铁锂前驱体-干混造粒-碳热还原的方法合成了一次颗粒为纳米级别,二次颗粒为微米级别的微纳米LiFePO₄正极材料。对比考察了商品微米LiFePO₄、纳米LiFePO₄及微纳米LiFePO₄正极材料与金属锂组成的实验电池的电化学性能。结果表明,微纳米LiFePO₄正极材料具有较好的电化学性能,特别是在高倍率条件下（5-10C）容量保持率均高于前两者。更多还原

【Abstract】 Preparation of nano-sized lithium ion phosphate（LiFePO₄）cathode materials is an effective method to improve its kinetic performance due to the advantages of small particle size and large specific surface area.However,the practical application of nano-LiFePO₄ has many problems because of its poor process performance.In this paper,we synthesized micro/nano LiFePO₄ cathode material with primary nano-sized particle and second micro-sized particle,via sol gel-dry mixing-carbothermal reduction method.The electrochemical property of commercialized LiFePO₄,nano-sized LiFePO₄ and micro/nano LiFePO₄ were characterized by electrochemical measurements.Comparing with other two kinds of LiFePO₄ material,micro/nano LiFePO₄ cathode material exhibited better electrochemical performance,especially at high C-rates.更多还原