Abstract: The cathode materials of LiFeBO₃ was prepared by means of solid reaction with lithium metaborate and ferric oxide as raw materials. LiFeBO₃ were coated with silicone polymer solution. The samples were characterized by X-ray diffraction and scanning electron microscopy. Electrochemical tests of materials showed that LiFeBO₃ exhibited a higher discharge mass specific capacity. The coated samples demonstrated the improved performance. Sample coated with 5% silicone had a initial capacity 195 mAh/g. There was only 4.3% capacity loss after 50 cycling.

Key words: lithium ion batteries, cathode materials, lithium iron borate, silicone polymer

摘要： 以偏硼酸锂和三氧化二铁为原料, 采用固相反应, 合成了动力锂离子电池新型正极材料LiFeBO₃, 并对该材料进行有机硅聚合物包覆保护处理。采用XRD和SEM等方法对样品进行表征。实验表明, LiFeBO₃具有较高的重量比容量, 而且有机硅聚合物包覆后的硼酸铁锂具有更好的电化学性能, 5%硅聚合物包覆的硼酸锂首次放电容量达195 mAh/g, 0.5 C充放电循环50次后容量衰减只有4.3%。

关键词: 锂离子电池, 正极材料, 硼酸铁锂, 有机硅聚合物