为改善LiNi_(0.5)Mn_(1.5)O_4的电化学性能,采用流变相法合成掺镁的锂离子电池正极材料LiMg_xNi_(0.5-x)Mn_(1.5)O_4(x=0,0.05,0.1).XRD测试结果表明所得材料仍为尖晶石结构.电化学性能测试结果显示:当x取值0.1,在3.5～4.9V电压范围内进行充放电循环时,材料LiMg_(0.1)Ni_(0.4)Mn_(1.5)O_4具有较好的循环性能,1C充放电时,初始放电比容量可达110.22mAh/g,30次循环后容量衰减率仅为7.7%.
In order to improve the electrochemical properties of LiNi_(0.5)Mn_(1.5)O_4 ,a series of Li-ion batteries cathode materials LiMg_xNi_(0.5-x)Mn_(1.5)O_4 (x=0.05, 0.1) were prepared by rheological method. XRD results reveal that the synthesized compounds had the spinel structure. Electrochemical tests show that when x was 0.1 the sample LiMg_(0.1)Ni_(0.4)Mn_(1.5)O_4 had excellent cycle ability in the potential range from 3.5 to 4.9 V. When the charge and discharge current was 1 C, the LiMg_(0.1)Ni_(0.4)Mn_(1.5)O_4 electrode delivered the initial discharge capacity of 110.22 mAh/g. Its capacity decline rate after 30 cycles was only 7.7%.
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