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溶胶-凝胶法制备稀土金属离子掺杂LiFePO4/C正极材料及其电化学性能研究
Preparation of Cathode Material LiFePO4/C Doped with Rare Earth Metal Ions by Sol-Gel Method and Study on Its Electrochemical Performance
【摘要】 采用溶胶-凝胶法,在溶胶阶段分别掺杂不同量的Gd3+、Ce4+、Sm3+和Tm3+制备了一系列具有橄榄石晶体结构的LiFePO4/C正极材料,通过X-射线衍射、扫描电镜和电池测试对其组成、形貌及电化学性能进行了表征。结果表明:Sm3+和Tm3+的掺杂会使LiFePO4/C的电化学性能变差,而掺杂1%(质量分数,下同)Gd3+或2%Ce4+会使LiFePO4/C的电化学性能提高,其中掺杂1%Gd3+的效果最好,0.1C下LiFePO4/C的首次放电比容量可达135.7mAh·g-1。
【Abstract】 A series of olivine structure LiFePO4/C cathode materials were synthesized by sol-gel method and doped with Gd3+,Ce4+,Sm3+and Tm3+at the stage of sol.The composition,morphology and electrochemical performance of LiFePO4/C were characterized by XRD,SEM and battery test,respectively.The results showed that the electrochemical performance of LiFePO4/C was downgraded with the doping of Sm3+and Tm3+,but the doping of 1%Gd3+or 2%Ce4+would improve the electrochemical performance of LiFePO4/C.The doping of1%Gd3+had the best effect,the initial discharge capacity of LiFePO4/C could reach 135.7mAh·g-1 at 0.1C.
【Key words】 sol-gel method； LiFePO4； modification； rare earth metal ions； electrochemical performance；
- 【文献出处】 化学与生物工程 ,Chemistry & Bioengineering , 编辑部邮箱 ,2015年04期
- 【分类号】TM912
- 【被引频次】4
- 【下载频次】172