摘要
用熔盐法制备出掺铬的尖晶石锂锰氧化物LiCrxMn2 -xO4 (x =0 ,0 0 3,0 16 ) ,并研究了合成掺杂样品的一些物理化学性质。样品中锰的化合价滴定分析结果表明 ,锰化合价随样品中铬含量的增加而增加。XRD结果表明 ,合成样品均属于立方晶系的尖晶石结构 ,掺铬量x =0 0 3时晶胞常数 (a =8 2 34Ao)与不掺铬时基本相同 (a =8 2 35Ao) ,x =0 16时晶胞常数降低 (a =8 2 2 3Ao)。恒电流充放电结果表明 ,随着掺铬量的增加 ,样品的循环稳定性增加 ,但初始容量降低 :x =0 ,0 0 3,0 16的初始容量和 5次循环后的容降依次为 97 9,94 5,73 2mA·h g和 34 5%、17 5%、4 2 %。
Chromium doped lithium manganese oxides LiCr xMn 2-x O 4(x=0,0 03,0 16)were prepared by solid-state reaction method and some physical and chemical performances of the products were studied. The oxidation states of manganese in the products decreased with increasing the doped amount of chromium. All the products had a spinel structure. The lattice parameter of the product with x=0 03(a=8 234Ao)was almost the same as that of the product without chromium (a=8 235Ao),but that of the product with x=0 16 was lower (a=8 223Ao). The cycling stability of the products increased with the doped amount of chromium, with the capacity fade of 34 5,17 5,4 2%, for x=0,0 03,0 16 respectively. However, the first capacity decreased rapidly, 97 9,94 5,73 2 mA·h?g for x=0,0 03,0 16 respectively.
出处
《中国锰业》
2001年第1期4-7,共4页
China Manganese Industry
基金
广州市科委资助课题!(98-Z - 0 77- 0 1)
