| 软硬双模板法制备双介孔炭及其储锂性能研究 |
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| 作者姓名： | 孙兵 唐文 丛野 袁观明 李轩科 |
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| 作者单位： | 武汉科技大学省部共建耐火材料与冶金国家重点实验室;武汉科技大学煤转化与新型炭材料湖北省重点实验室 |
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| 基金项目： | 国家自然科学基金资助项目(51472186). |
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| 摘 要： | 以中间相沥青为前驱体,三嵌段共聚物F127和纳米CaCO_3分别为软硬模板剂,采用有机-无机自组装方式制备双介孔炭(BMCs)用作锂离子电池负极材料。借助XRD、Roman、SEM、TEM、氮气吸脱附及恒电流充放电测试对所制双介孔炭材料的结构、形貌及电化学性能进行了表征,研究了软硬模板剂比例与热处理温度对其孔结构及电化学性能的影响。结果表明,当中间相沥青、三嵌段共聚物F127、纳米CaCO_3质量比为2∶1∶7时,所制备的双介孔炭材料电化学性能最佳,在100 mA/g的电流密度下,该材料首次放电比容量可达563.2 mAh/g,100次循环容量保持率为81.25%,在2000 mA/g的电流密度下,其放电比容量为206.3mAh/g;随着热处理温度的升高,双介孔炭孔道结构逐渐坍塌,其可逆储锂容量不断降低,在热处理温度为1800℃时降到最低值,当热处理温度进一步升高达到2300℃以上时,因石墨微晶排列有序度大幅提高,有利于锂离子的嵌入脱出,由此导致材料的可逆储锂容量又开始不断增加。热处理温度低于2300℃时,材料的储锂容量主要取决于其内部缺陷及孔隙,在2300℃及更高温度进行热处理时,材料的储锂容量主要为层间插锂容量。
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| 关 键 词： | 中间相沥青 介孔炭 锂离子电池 负极材料 双模板法 储锂性能 电化学性能 |
| 收稿时间： | 2018/3/11 0:00:00 |
Soft and hard templates preparation of bimodal mesoporous carbons and its lithium storage properties |
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| Authors: | Sun Bing Tang Wen Cong Ye Yuan Guanming and Li Xuanke |
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| Institution: | 1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China,1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China and 1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China |
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| Abstract: | |
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| Keywords: | mesophase pitch mesoporous carbon lithium-ion battery anode material dual-templating Li storage performance electrochemical property |
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