YUE Peng, PENG Wen-jie, WANG Zhi-xing, LI Xin-hai, LI Ling-jun, GUO Hua-jun, HU Qi-yang, ZHANG Yun-he
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The micro-size LiNi 0.8Co0.1Mn0.1O2 cathode material was synthesized by mixing Ni 0.8Co0.1Mn0.1(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, LiNi 0.8Co0.1Mn 0.1O2 synthesized at 750 ℃ for
15 h exhibits a higher initial discharge capacity of 186.748 mA C compared with those of LiNi ·h/g at 0.1 0.8Co0.1Mn0.1O2
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: LiNi 0.8Co0.1Mn0.1O2; cathode material; co-precipitation; electrochemical performance