摘要
氮磷硫自掺杂竹炭的制备工艺简单、安全、绿色环保,这对于其他生物质材料制备复合材料具有一定的指导意义。以竹子(富含N、P、S成分)为碳源,KOH为活化剂,在氮气气氛下800℃高温活化和热解制备成多孔竹炭(BDC-800),同时实现了N、P、S掺杂;BDC-800表现出1 911 m;/g的表面积和1.21 cm;/g的孔体积,且具有大量的分级多孔结构。BDC-800作为锂离子电池负极材料,在0.50 C速率下充电/放电可以提供681.4 mAh/g高储存容量;即使在2 C高速率下充电/放电循环700次,仍然保留390.1 mAh/g储存容量,具有良好的循环稳定性;在不同充电/放电速率下(在0.25, 0.50, 1.00和2.00 C对应的放电比容量分别为754.1, 697.8, 580.2 and 403.2 mAh/g),表现出优异的倍率性能。BDC-800出色的电化学性能归因于高的表面积和分级多孔结构,以及N、P、S掺杂和众多表面缺陷引起的电容行为贡献。
The preparation process of nitrogen, phosphorus and sulfur self-doped bamboo charcoal issimple, safe and environmentally friendly, which has certain guiding significance for other biomassmaterials to prepare composite materials. In this research, bamboo(rich in N, P and S components)is used as a biomass-derived carbon precursor, and KOH is used as an activator, then porous bamboocharcoal( BDC-800) is prepared by activation and carbonization in a high-temperature nitrogenatmosphere at 8020 ℃ while also achieving N, P and S doping. BDC-800 has a high specific surfacearea of 1 911 m;/g, a large pore volume of 1. 21 cm;/g, and a large number of hierarchical porousstructures. BDC-800 as an anode material in a lithium-ion battery shows a high storage capacity of681. 4 mAh/g at a rate of 0. 50 C(1 C =372 mAh/g), good cycling stability(390. 1 mAh/g at 2. 00 Cafter 700 cycles) and excellent rate performance(754. 1, 697. 8, 580. 2 and 403. 2 mAh/g at 0. 25,0. 50, 1. 00 and 2. 00 C, respectively). The excellent electrochemical performance of BDC-800 isattributed to its high specific surface area and hierarchical porous structure, as well as the capacitivecontribution to the total charge caused by the doped N, P and S and the abundance of surface defects.
作者
陈前林
吴洪
CHEN Qianlin;WU Hong(College of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China)
出处
《贵州大学学报（自然科学版）》
2022年第1期1-16,共16页
Journal of Guizhou University:Natural Sciences
基金
贵州省百层次人才资助项目(QKHPTRC[2016]5658)。
关键词
锂离子电池
负极材料
竹炭
自掺杂
电容贡献
lithium-ion battery
anode
bamboo charcoal
self-doped
capacitive contribution
