(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用共沉淀法制備Ni0.8Co0.1Mn0.1(OH)2前驅(qū)體，與LiOH·H2O混合后在氧氣氣氛中焙燒得到LiNi0.8Co0.1Mn0.1O2正極材料，探討共沉淀反應(yīng)過(guò)程中快速加料和慢速加料制度對(duì)前驅(qū)體形貌和LiNi0.8Co0.1Mn0.1O2正極材料性能的影響。通過(guò)X射線衍射(XRD)、掃描電鏡(SEM)和電化學(xué)測(cè)試對(duì)樣品進(jìn)行表征。結(jié)果表明：慢速加料法減小了材料的粒徑，合成了平均粒徑在0.5 μm左右的球形Ni0.8Co0.1Mn0.1(OH)2前驅(qū)體，且粒徑分布比較集中；所合成LiNi0.8Co0.1- Mn0.1O2正極材料具有良好的層狀結(jié)構(gòu)，且無(wú)雜相存在；緩慢加料法得到的樣品的電化學(xué)性能有很大提高，在0.1 C、0.5 C和1 C下首次放電比容量分別達(dá)到223.5、194.3和190.7 mA∙h/g，循環(huán)30次后，容量保持率為80.09%、80.80%和85.84%。
關(guān)鍵字: 鋰離子電池；正極材料；LiNi0.8Co0.1Mn0.1O2；共沉淀
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The mixture of Ni0.8Co0.1Mn0.1(OH)2 precursors were synthesized by co-precipitation, and calcined with LiOH·H2O to produce LiNi0.8Co0.1Mn0.1O2 cathode material in oxygen atmosphere. The influence of the fast feeding rate and slow feeding rate during the process of co-precipitation on the morphology of the precursors and the performance of cathode materials LiNi0.8Co0.1Mn0.1O2 were discussed. The samples were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical test. The results show that with the slow feeding method, a narrow size-distribution spherical Ni0.8Co0.1Mn0.1(OH)2 precursors are prepared, and the average size is about 0.5 μm. The synthesized cathode materials have good layered structure and no impurity present, the electrochemical performance of the samples obtained by the slow feeding mathod is greatly improved. The first discharge capacities are 223.5, 194.3 and 190.7 mA∙h/g at 0.1 C, 0.5 C and 1 C, respectively, and after 30 cycles, the retention rates of capacity at 0.1 C, 0.5 C and 1 C are 80.09%, 80.80% and 85.84%, respectively.
Key words: lithium-ion battery; cathode material; LiNi0.8Co0.1Mn0.1O2; co-precipitation
