(湘潭大學(xué) 化學(xué)學(xué)院 環(huán)境友好化學(xué)與應(yīng)用教育部重點(diǎn)實(shí)驗(yàn)室，湘潭 411105)
摘 要: 以碳化鈣為原料、新鮮氯氣為刻蝕劑，在400~700 ℃范圍內(nèi)制備碳化鈣骨架碳作為鋰離子電池新型負(fù)極材料。用X射線衍射(XRD)、掃描電鏡(SEM)、氮?dú)馕綄?shí)驗(yàn)、恒流充放電、交流阻抗(EIS)等對(duì)碳化鈣骨架負(fù)極材料進(jìn)行表征及電化學(xué)性能測(cè)試，并探討制備溫度對(duì)碳化鈣骨架碳結(jié)構(gòu)和電化學(xué)性能的影響。結(jié)果表明：所有溫度下制備的碳化鈣骨架碳均為無(wú)定形碳材料，但隨著制備溫度的升高，材料出現(xiàn)部分石墨化傾向；600 ℃制備的碳化鈣骨架碳具有良好的電化學(xué)性能，在0.1 C充放電時(shí)，首次放電比容量為890.9 mA∙h/g，可逆容量為335.4 mA∙h/g，循環(huán)30次后的可逆容量為266.8 mA∙h/g。
關(guān)鍵字: 鋰離子電池；負(fù)極材料；無(wú)定形碳；骨架碳；電化學(xué)性能
（Key Laboratory of Environmentally Friendly Chemistry and Applications, Ministry of Education,
School of Chemistry, Xiangtan University, Xiangtan 411105, China）
Abstract:The calcium carbide-derived-carbon was synthesized from CaC2 in a freshly prepared chlorine environment at the temperature range of 400−700 ℃. The influences of temperature on the structure and electrochemical properties of calcium carbide-derived-carbon were studied, and the properties of sample were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), nitrogen sorption experiment, constant current charge-discharge and AC impedance, respectively. The results show that all the calcium carbide-derived-carbons are disorder carbon. The carbide-derived-carbon appears partly graphitization tendency with the increase of the temperature. The carbide-derived-carbon synthesized at 600 ℃ has good electrochemical performance. It delivers lithium insertion and deinsertion capacities of 890.9 mA∙h/g and 335.4 mA∙h/g, respectively, during the first cycle at a rate of 0.1 C, and the deinsertion capacity is 266.8 mA∙h/g after 30 cycles.
Key words: Li-ion battery; anode material; disordered carbon; carbide derived-carbon; electrochemical performance
