(中南大學 冶金科學與工程學院，長沙 410083)
摘 要: 將液相共沉淀法制備的Ni0.8Co0.1Mn0.1(OH)2與LiOH·H2O混合，固相燒結合成微米級的LiNi0.8Co0.1Mn0.1O2 正極材料。XRD譜表明，合成的LiNi0.8Co0.1Mn0.1O2 正極材料為典型的α-NaFeO2層狀結構，無雜質峰；從SEM像可以看出，產物顆粒為類球形，分散性好，由一次粒子緊密堆積而成，平均粒徑為3 μm；電化學測試結果表明，在2.8~4.3 V電壓范圍內，750 ℃焙燒15 h合成的LiNi0.8Co0.1Mn0.1O2材料的電化學性能最優(yōu)，0.1 C 時，其首次放電容量為186.748 mA·h/g，分別高于700和800 ℃時的首次放電容量172.947和180.235 mA·h/g。材料在0.5和2 C時循環(huán)40次后，容量保持率分別為98.32%和88.72%，循環(huán)性能良好。
關鍵字: LiNi0.8Co0.1Mn0.1O2；正極材料；共沉淀法；電化學性能
micro-size LiNi0.8Co0.1Mn0.1O2 cathode material
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The micro-size LiNi0.8Co0.1Mn0.1O2 cathode material was synthesized by mixing Ni0.8Co0.1Mn0.1(OH)2 and LiOH·H2O via solid state reaction followed by heating to elevated temperatures. X-ray diffraction (XRD) patterns show that all samples exhibit typical α-NaFeO2 structure without any other impurities. The scanning electron microscopy (SEM) reveals that the primary particles agglomerate to form secondary particles with an average size of 3 μm, and the particles are near-spherical and well distributed. In the voltage range of 2.8−4.3 V, LiNi0.8Co0.1Mn0.1O2 synthesized at 750 ℃ for 15 h exhibits a higher initial discharge capacity of 186.748 mA·h/g at 0.1 C compared with those of LiNi0.8Co0.1Mn0.1O2 synthesized at 700 and 800 ℃ (172.947 and 180.235 mA·h/g, respectively). The material has excellent cycling performance, in which the capacity retention at the rates of 0.5 and 2 C are 98.32% and 88.72%, respectively, after 40 cycles.
Key words: LiNi0.8Co0.1Mn0.1O2; cathode material; co-precipitation; electrochemical performance
