摘要
以Li2CO3和Ni0.5Co0.2Mn0.3(OH)2为原料,采用高温固相烧结法,合成高压实型NCM523正极材料。用X射线衍射(XRD)、扫描电子显微镜(SEM)、压实密度及充放电测试等方法,对材料的结构、形貌和电化学性能进行了表征,研究了掺杂Sr元素对三元正极材料性能的影响。实验结果表明,掺Sr后,三元正极材料的一次颗粒和晶胞体积增大;掺杂样品的压实密度达到3.70 g/cm3,比未掺杂样品提高7.2%左右。掺Sr量为0.10%的样品,1C下比容量达到154 m Ah/g,体积比能量密度比未掺杂样品高8%,100周循环后,所合成的高压实型NCM523材料的容量保持率达到94.2%。
The NCM523 cathode materials with high compacted density were synthesized by high-temperature solid-phase sintering, with Li2CO3 and Ni0.5Co0.2Mn0.3（OH） 2 as raw material. Then, the structure, morphology and electrochemical performance of the as-prepared materials were investigated by X-ray diffraction （ XRD）, scanning electron microscope （SEM）, as well as tests of compacted density and charge-discharge cycling. The effects of Sr dopant on the electrochemical properties of the as-prepared materials were studied. The results showed that the primary particle size and the ceil volume all increased after doping. The compacted density of Sr-doped sample was 3.70 g/cm3, about 7.2% higher compared to the sample without Sr-doping. As for the sample with Sr-doping at 0.10%, the discharge specific capacity reached to 154 mAh/g at 1C-rate, and the volume ratio of energy was about 8% higher than the sample without doping. After 100 cycles at 1C-rate, the capacity retention of the Sr-doped NCM523 cathode material with high compacted density can be up to 94.2%.
出处
《矿冶工程》
CAS
CSCD
北大核心
2015年第5期121-124,共4页
Mining and Metallurgical Engineering
基金
长沙市科学技术局培育战略性新兴产业资金专项(K1403368-11)
关键词
正极材料
锂离子电池
三元正极材料
NCM523
Sr掺杂
压实密度
电性能
cathode materials
Li-ion battery
ternary cathode materials
NCM523
Sr doping
compacted density
electrochemical performance
