CAJ | 학술논문

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 mAh/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%.
이Li2CO3 화Ni0.5Co0.2Mn0.3(OH)2 위원료,채용고온고상소결법,합성고압실형NCM523정겁재료. 용X사선연사(XRD)、소묘전자현미경( SEM)、압실밀도급충방전측시등방법,대재료적결구、형모화전화학성능진행료표정,연구료참잡Sr원소대삼원정겁재료성능적영향. 실험결과표명,참Sr후,삼원정겁재료적일차과립화정포체적증대;참잡양품적압실밀도체도3.70 g/cm3,비미참잡양품제고7.2%좌우. 참Sr량위0.10%적양품,1C하비용량체도154 mAh/g,체적비능량밀도비미참잡양품고8%,100주순배후,소합성적고압실형NCM523재료적용량보지솔체도94.2%.
The NCM523 cathode materials with high compacted density were synthesized by high-temperature solid-phase sintering, with Li2 CO3 and Ni0.5 Co0.2 Mn0.3( 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 cell 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%.