摘要
采用固相法制备LiMn0.98Mg0.02PO4/C材料,以葡萄糖为碳源,通过不同加入量对材料进行碳包覆改性研究。研究结果表明:制备的材料均为橄榄石型结构,葡萄糖的含量对材料的颗粒形貌没有较大影响,但随着葡萄糖含量的增加,颗粒团聚尺寸减小,分布均匀;当葡萄糖加入量为40%(质量分数)时,制备的材料以0.05C、0.2C充放电,放电比容量分别为100.1mA·h/g,79.4mA·h/g;0.05C倍率30次循环后,容量保持率为73%,而0.2C倍率下,容量保持率仅为54%。
The LiMn0.98 Mg0.02 PO4/C materials were synthesized by solid method.Study on modification of the carbon-coated materials was carried by adding different glucose content.The results show that all materials had perfect phosphor-olivine structure,there is no significant difference in particles morphology content.But increasing glucose content,the agglomeration of the particles size reduced,and the particles distribution was uniform.When glucose content reached 40wt％,the material was charged and discharged at 0.05 C or 0.2 C,its discharge capacity could reach 100.1 mA · h/g or 79.4 mA · h/g respectively.And capacity retention ratio of the material can reach 73％ at 0.05 C for 30 cycles,there was only 54％ at 0.2 C.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2014年第6期33-36,共4页
Materials Reports
基金
广州市应用基础重点项目(12C54041653)
