一步实现LiFePO_4的碳包覆和金属掺杂新思路  

A New Conception of One-Step to Achieve Carbon Coating and Na^+ Doping in Preparation of LiFePO_4

作　　者：高攀[1] 赵红[1] 李明露[1] 丁伟元 何晓寒 楚天阔 刘宏文[2] 徐辉[2] 

机构地区：[1]大连交通大学环境与化学工程学院,辽宁大连116028 [2]大连市环境监测中心,辽宁大连116033

出　　处：《大连交通大学学报》2017年第3期64-67,共4页Journal of Dalian Jiaotong University

摘　　要：采用聚丙烯酸钠高温还原法制备LiFePO_4/C材料,同时达到掺杂金属Na+的目的.以聚丙烯作为碳源高温固相还原制备LiFePO_4作为对比试验.经XRD和SEM分析,聚丙烯酸钠作为碳源制备出的LiFePO_4,该材料具有较好橄榄石型结构,晶型良好,粒径分布均匀,较聚丙烯作为碳源各方面性能均有较大提升.0.1C首次放电,该材料放比电容量高达168 m Ah/g,且循环性能良好.从而说明使用聚丙烯酸钠高温固相还原制备LiFePO_4是一种新型实用方法.The cathode material of olivine-structured LiFePO4/C was prepared by hyperthermal solid-state reduction with sodium polyacrylate（ PAAS） to achieve goals of doping Na＋and carbon coating at one step. Polypropylene（ PP） was chosen as carbon source for comparative trial. XRD and SEM analysis suggests that PAAS as carbon source shows a better performance,such as better olivine-structured and uniform distribution of particle size compared with PP. Electrochemical test results show that the sample prepared by the method above exhibits favorable electrochemical performance with an initial discharge capacity of 168 m Ah/g at 0. 1C and good cycling stability. It is a superb practicable technology to prepare LiFePO4 by hyperthermal solid reduction with PAAS to fulfill carbon coating and Na＋doping at one step.

关 键 词：聚丙烯酸钠 LIFEPO4 高温固相 金属掺杂 

分 类 号：TQ131.11[化学工程—无机化工]