高压实密度纳米磷酸铁锂的制备工艺研究

Study on Preparation Process of High Pressure Solid Density Nano-Lium Iron Phosphate

本文在采用石墨烯掺杂的基础上通过二次烧结工艺,严格控制烧结温度、升温速率、碳包覆起始温度等各项参数,在保持高性能的前提下增大了一次粒径,使材料的极限压实密度比常规的纳米磷酸铁锂提高0.4 g/cm^3。在1C倍率充放电下,电池循环2000次后容量保持率依然达到90%。

In this paper, on the basis of graphene doping, through the secondary sintering process, the parameters such as sintering temperature, heating rate, and carbon coating initiation temperature are strictly controlled, and the primary particle size is increased under the premise of maintaining high performance. The ultimate compaction density of the material is 0.4 g/cm^3 higher than conventional nanometer lithium iron phosphate. At 1 C rate charge and discharge, the capacity retention rate of the battery after cycling 2000 times still reached 90 %.