用热处理石油焦作锂离子电池负极的探讨

Investigation of Heat Treated Petroleum Coke as Negative Electrode for Lithium Ion Secondary Batteries

研究了不同热处理温度的石油焦在lmol/L LiClO_4/EC+DEC(体积比为l:1)电解液体系中作为锂离于二次电池负极的充放电行为,探讨了石油焦的结构与其充放电特性的关系,并用原位—X射线衍射(in situ—XRD)测定了充放电过程中Li-C石墨层间化合物的阶转变。

Electrochemical behaviors of one kind of petroleum cokes prepared at different heat treatment temperatures (HTT)as negative electrode for lithium ion secondary batteries were investigated. The electrolyte solution was 1mol/L LiClO4 in a mixture (1:1 by volume)of ethylene carbonate (EC) and diethyl carbonate (DEC). The relationship between the structure and charge-discharge characteristics of the petroleum coke was discussed and the stage transition of the lithium - graphite intercalation compound was determined by in situ -X ray diffraction (in situ -XRD).