共沉淀法制备LiMn_(2-x)Co_xO_4正极材料及其电化学性能(英文)

以Li2CO3、Mn(Ac)2.4 H2O和Co(Ac)2.4 H2O为原料,通过简单的共沉淀法制备锂离子电池正极材料Li Mn2-xCoxO4(x=0,0.05,0.1,0.2,0.3,0.4,0.5),并用X-射线衍射光谱(XRD)、红外光谱(FT-IR)、扫描电镜(SEM)以及电化学测试方法,研究Co掺杂量对Li Mn2-xCoxO4(x=0~0.5)正极材料的物理性能和电化学性能的影响.结果表明,在所有的Li Mn2-xCoxO4(x=0,0.05,0.1,0.2,0.3,0.4,0.5)样品中,Li Mn1.9Co0.1O4具有最高的容量和最好的循环性能,0.5 C倍率的放电容量高达121.4 mAh.g-1,循环30次后容量仍保持119 mAh.g-1.

Electrochemical Performance of LiMn2-xCoxO4 Cathode Materials Synthesized by a Co-Precipitation Method

LiMn2-xCoxO4 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4 and 0.5) cathode materials for lithium-ion batteries were synthesized by a simple co-precipitation method using Li2CO3, Mn(Ac)2·4 H2O and Co(Ac)2·4H2O as raw materials, and the effects of the Cobalt-doped concentration of LiMn2-xCoxO4 on the physical properties and electrochemical performance of the prepared cathode materials were investigated by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and electrochemical tests. The results show that LiMn1.9Co0.1O4 has the highest discharge capacity and best cycle performance amongst all the LiMn2-xCoxO4 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4,0.5) samples. LiMn1.9Co0.1O4 exhibits 121.4 mAh·g-1 of discharge capacity at 0.5 C and remains discharge capacity of 119 mAh·g-1 at 0.5 C after 30 cycles.