喷雾热分解制备Li[Ni_xCo_(1-2x)Mn_x]O_2及电化学性能研究  

Synthesis and Electrochemical Characterization of Li[Ni_xCo_(1-2x)Mn_x]O_2 Prepared by Spray Pyrolysis

作　　者：刘智敏[1] 刘业翔[1] 胡国荣[1] 邓新荣[1] 高旭光[1] 肖政伟[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《材料导报（纳米与新材料专辑）》2008年第2期260-262,265,共4页

摘　　要：应用喷雾热分解工艺合成了Li[Ni_xCo_(1-2x)Mn_x]O_2(x=0.25,0.33,0.4,0.5)系列复合氧化物。采用SEM、XRD、ICP、扣式电池测试等方法对材料的结构和性能进行了表征。测试结果表明,喷雾热分解合成的材料Li[Ni_xCo_(1-2x)Mn_x]O_2为球形形貌,而且化学成分得到很好的控制。Co含量增加后,晶胞参数a、c值减小,而I_(003)/I_(104)值增加,说明Co对层状结构起到了稳定作用,能抑制Li^+与Ni^(2+)之间的混排。2025型扣式电池的测试结果显示,高Co含量复合氧化物材料比低Co含量材料的首次充放电比容量稍高,同时倍率性能和循环性能也得到一定的改善。The layered Li[NixCo1--2xMnx]O2 （x=0. 25.0.33.0.4,0. 5） materials are synthesized by spray pyrolysis methods, and characterized by means of SEM, XRD, ICP, charge/discharge tests etc techniques. The test results show that spherical Li[NixCo1--2xMnx]O2 is prepared by spray pyrolysis and the chemical content of samples is well controlled. As the Co content increases, the lattice parameters of Li[NixCo1--2xMnx]O2 decreased in a axis and c axis, but I003/I104 increased. The result indicate that the Co content can stabilify the layered structure, and reduce structural disorder between Ni^2＋ and Li^＋. The results of the electrochemical tests on 2025 coin-cells show high Co content samples have a higher specific discharge capacity, better rate performance and cycling characteristic.

关 键 词：球形Li[NixCo1--2xMnx]O2 喷雾热分解 锂离子电池 

分 类 号：TB34[一般工业技术—材料科学与工程]