流变相法合成LiNi_(0.85)Co_(0.15)O_2的结构与电化学性能

Structure and Electrochemical Performance of LiNi_(0.85)Co_(0.15)O_2 Synthesized via a Rheological Phase Method

以一种新型的软化学方法——流变相法,成功地合成了锂离子电池正极材料LiNi0.85Co0.15O2.将在600-850℃氧气氛下处理6h后得到的LiNi1-yCOyO2(y=0.10,0.15,0.20,0.25),进行X射线粉末衍射(XRD)与电化学测试.测试结果表明,流变相前体经过800℃烧结后合成的LiNi0.85Co0.15O2晶胞参数a=0.2866nm,c=1.4193nm及晶胞体积V=0.1010nm3,以0.1C倍率在3.0-4.3V(vs.Li+/Li)放电时,首次放电容量可以达到198.2mAh/g,20次循环后,其放电容量仍在174mAh/g以上.

A rheological phase method was employed successfully to synthesize LiNi0.85CO0.15O2 cathode materials for lithium-ion batteries. LiNi1-yCOyO2 (y = 0-10, 0.15, 0.20, 0.25) compounds were calcined for 6 h at 600-850 degrees C under flowing oxygen. And these samples were characterized by powder X-ray diffraction (XRD) and electrochemical tests. Lattice parameters from XRD patterns of LiNi0.85Co0.15O2 calcined at 800 degrees C show that a=0.2866 nm, c=1.4193 nm and the lattice volume V=0.1010 nm(3). The first discharge capacity of LiNi0.85Co0.15O2 synthesized at 800 degrees C for 6 h was 198.2 mAh/g, and the 20th discharge capacity was still above 174 mAh/g, at a 0.1 C rate between 3.0 similar to 4.3 V (vs. Li+/Li).