磷酸铁锂正极材料的制备及性能强化研究进展

橄榄石型磷酸铁锂是目前应用十分广泛的锂离子电池正极材料之一,具有成本低、安全性高、环境友好、循环寿命长和工作电压稳定的特点。近年来,随着CTP技术、刀片电池技术等取得的突破性进展,磷酸铁锂的商业化程度得到了大幅提高。但磷酸铁锂存在电子导电性较差和离子扩散系数低的缺陷,严重限制了锂离子电池的电化学容量,因此开展磷酸铁锂制备工艺和性能强化研究对磷酸铁锂的性能提升具有重要意义。对比了磷酸铁锂电池与其他正极材料锂离子电池的性能差异和发展现状,系统总结了磷酸铁锂正极材料制备与强化的改性方法及相关研究进展与挑战,并提出了未来的发展方向与研究思路。

Research progress in synthesis and performance enhancement of LiFePO4 cathode materials

Olivine LiFePO₄ is one of the most widely used cathode materials for lithium-ion batteries,with characteristics of low cost,high safety,environment-friendly,long cycle life and stable operating voltage.In recent years,with the breakthrough of CTP technology and blade battery technology,its commercialization progress has been greatly improved.However,LiFePO₄ has the defects of poor electronic conductivity and low ion diffusion coefficient,which seriously limits the electrochemical capacity of lithium-ion battery.It is of great significance to study on the preparation process and performance enhancement of LiFePO₄. In this paper,the differences of performance and development status of LiFePO₄ and other cathode materials for lithium-ion batteries were compared.The modification methods of preparation and strengthening of LiFePO₄ cathode materials and related research progress and challenges were systematically summarized,and the future development direction and research ideas were put forward.