摘要
以兖州煤为原料 ,在 70 0～ 10 0 0℃下热裂解制备煤基炭材料。氮气物理吸附和X射线衍射分别考察了炭材料的BET比表面积、孔容以及微晶结构的变化 ;并将炭材料制作成电极以考察其嵌锂行为。研究发现随着热处理温度的升高 ,煤基炭材料的微晶结构变得有序 ,而BET比表面积、孔容以及首次充放电可逆容量呈现下降趋势。在 70 0℃下热裂解所制备的炭材料 ,其放电容量高达 470mAh/ g。
Carbon materials were prepared at temperature(700-1 000℃) by pyrolyzing Yanzhou coal. BET surface area and pore volume of carbon materials were investigated by nitrogen adsorption isotherms. Power X ray diffraction pattern of carbon materials was studied. Electrochemical cells were made to study lithium insertion in these carbon materials. Performance of lithium insertion was discussed. The results showed that with increasing pyrolysis temperature,carbon materials became structurally order, while BET surface area , pore volume and first reversible capacity decreased. It was found that heat treated carbon at 700℃ possessed a high discharge capacity of about 470 mAh/g.
出处
《电池》
CAS
CSCD
北大核心
2002年第2期66-68,共3页
Battery Bimonthly
基金
山西省自然科学基金 (9910 68)
中科院重点基金
石油大学重质油加工国家重点实验室开放基金 (19990 1)
