CAJ | 학술논문

采用LiAc·2H2O作为锂源,利用熔盐碳热还原方法在较低的烧结温度和较短的烧结时间内(650℃,4h)合成纯相LiFePO4/C材料.扫描电镜照片显示这种方法合成的材料粒径大约为1 μm,小于用Li2CO3作为锂源合成的材料.电化学测试表明,采用LiAc·2H2O作为锂源合成的材料表现出了高的放电容量和良好的倍率循环性能:在0.5C和5C倍率下,其首次放电容量分别为148 mA·h/g和115 mA·h/g; 50次循环后,容量保持率分别为93％和89％.
채용LiAc·2H2O작위리원,이용용염탄열환원방법재교저적소결온도화교단적소결시간내(650℃,4h)합성순상LiFePO4/C재료.소묘전경조편현시저충방법합성적재료립경대약위1 μm,소우용Li2CO3작위리원합성적재료.전화학측시표명,채용LiAc·2H2O작위리원합성적재료표현출료고적방전용량화량호적배솔순배성능:재0.5C화5C배솔하,기수차방전용량분별위148 mA·h/g화115 mA·h/g; 50차순배후,용량보지솔분별위93％화89％.
With LiAc·2H2O as Li precursor,pure olivine phase LiFePO4/C was synthesized at a relatively low temperature (650 ℃)and short sintering period (4 h) by molten salt carbothermal reduction method.Scanning electron micrograph shows that particle size of the product is about lμm,smaller than that of the sample synthesized with Li2CO3 as Li precursor.Electrochemical measurements prove that LiFePO4/C obtained from LiAc·2H2O shows high capacity.The initial discharge capacities are 148 mA·h/g at 0.5C rate and 115 mA·h/g at 5C rate,respectively.After 50 cycles,the capacity retention ratios are 93％ and 89％ at 0.5C rate and 5C rate,respectively.