锂离子电池正极材料LiNi_(0.4)Ru_(0.05)Mn_(1.5)O_4提高放电能力  

Lithium Ion Battery Cathode Material LiNi_(0.4)Ru_(0.05)Mn_(1.5)O_4 to Improve Current Discharge

作　　者：施凯[1] 陈友存[1] 

机构地区：[1]安庆师范学院,安徽安庆246003

出　　处：《广东化工》2016年第11期48-50,共3页Guangdong Chemical Industry

摘　　要：我们用柠檬酸辅助的溶胶法、在800℃和1000℃的最终煅烧温度下,生产高压阴极Li Ni_(0.4)Ru_(0.05)Mn_(1.5)O_4。通过同步加速器辐射、等离子体-发射光谱以及扫描电子显微镜分析、高分辨率粉末衍射来描绘材料的结构、化学组成及形态特点。我们通过X射线吸收光谱研究确认尖晶石内是否有钌掺杂、并比较过渡金属的氧化态。Li Ni_(0.4)Ru_(0.05)Mn_(1.5)O_4粉末在1000℃条件下合成,其初始容量为-139 m Ah·g^(-1),在3.5~5.0伏、C/2充电-放电率条件下,经过300次循环后容量保持率为(初始容量的)84%,这表明其大电流放电能力及循环稳定性非常好。The citric acid-assisted solegel method was used to produce the high-voltage cathodes and LiNi0.4Ru005Mn1.5O4 at 800℃ and 1000℃ final calcination temperatures. High resolution powder diffraction using synchrotron radiation, inductively coupled plasma e optical emission spectroscopy and scanning electron microscopy analyses were carried out to characterize the structure, chemical composition and morphology. X-ray absorption spectroscopy studies were conducted to confirm Ru doping inside the spinel as well as to compare the oxidation states of transition metals. The LiNi0.4Ruo.05Mn1504 powder synthesized at 1000℃shows the highest performance regarding the rate capability and cycling stability. It has an initial capacity of-139 mAh＇g I and capacity retention of 84 % after 300 cycles at C/2 chargingedischarging rate between 3.5 and 5,0 V.

关 键 词：尖晶石 钌掺杂 高压阴极 大电流放电能力 锂离子电池 

分 类 号：TQ174.13[化学工程—陶瓷工业]