无灰煤基活性炭的制备及其电化学性能研究
发布时间：2018-07-29 09:01
【摘要】：双电层电容器(Electric Double Layer Capacitor,EDLC)是一种高效储能元件。用于EDLC的电极材料多种多样,其中煤基活性炭是最主要,效果最好的电极材料。将低阶煤基无灰煤应用于EDLC电极材料的制备中,既可以为低阶煤的利用提供新途径,又可以排除灰分对电容器性能的影响,提高EDLC的质量比容量(以下简称比电容),能量密度等电化学性能。对无灰煤基活性炭的制备工艺与活性炭(ACs)孔结构、电化学性能之间的关系进行了系统的考察。通过对比原煤基活性炭(Coal-ACs)与无灰煤基活性炭(HPC-ACs)的各项参数,分析了灰分对于ACs孔结构和电化学性能的影响;以直接活化法和炭化-活化法分别制备ACs,通过调整制备过程中活化温度(AT)、活化时间(At)、碱煤比(K/C)、炭化时间(Ct)和炭化温度(CT)等工艺参数,分析了制备条件对ACs孔结构和电化学性能的影响。探讨了比表面积、中孔率与孔径分布对ACs比电容的影响。结果表明:无灰煤是制备EDLC电极材料的优质原料。以低阶煤基无灰煤为原料所制备ACs灰分仅为0.36%,其比电容和倍率性均高于原煤基活性炭。改变ACs的制备条件可获得不同孔径分布的ACs。褐煤基无灰煤在AT为600℃,At为1.5 h,K/C为3:1的制备条件下,可获得比表面积1473 m2/g,孔径集中在0.58~0.73 nm之间的微孔活性炭。将该ACs用于EDLC中,其比电容和能量密度分别高达373.44 F/g和33.73 Wh/kg,且具有良好的倍率性,经1000次循环后,比电容仍能维持在80%以上。炭化工艺对HPC-ACs的比表面积和孔径分布有一定影响,但对其电化学性能的提高并不明显。
[Abstract]:Double layer Capacitor (Electric Double Layer) is an efficient energy storage element. The electrode materials used for EDLC are various, among which coal-based activated carbon is the most important and most effective electrode material. The application of low-rank coal-base ashless coal to the preparation of EDLC electrode material can not only provide a new way for the utilization of low-rank coal, but also eliminate the influence of ash content on the performance of capacitor. Improve the mass specific capacity of EDLC (hereinafter referred to as specific capacitance), energy density and other electrochemical properties. The relationship between the preparation process of coal-free activated carbon and the pore structure and electrochemical performance of activated carbon (ACs) was systematically investigated. By comparing the parameters of raw coal based activated carbon (Coal-ACs) and ashless coal based activated carbon (HPC-ACs), the influence of ash on the pore structure and electrochemical performance of ACs was analyzed. Acs were prepared by direct activation method and carbonization activation method respectively. The activation temperature (AT), activation time (At), alkali coal ratio (K / C), carbonization time (Ct) and carbonization temperature (CT) were adjusted during the preparation process. The effects of preparation conditions on pore structure and electrochemical properties of ACs were analyzed. The effects of specific surface area, mesopore ratio and pore size distribution on the specific capacitance of ACs were discussed. The results show that ashless coal is a good raw material for the preparation of EDLC electrode materials. The ash content of ACs prepared from low-rank coal-free coal is only 0.36, and its specific capacitance and ratio are higher than that of raw coal-based activated carbon. ACS with different pore size distribution can be obtained by changing the preparation conditions of ACs. The activated carbon with a specific surface area of 1473 m2 / g and a pore size of 0.58 ~ 0.73 nm can be obtained from lignite-based ash free coal at an AT of 600 鈩，
本文编号：2152171
[Abstract]:Double layer Capacitor (Electric Double Layer) is an efficient energy storage element. The electrode materials used for EDLC are various, among which coal-based activated carbon is the most important and most effective electrode material. The application of low-rank coal-base ashless coal to the preparation of EDLC electrode material can not only provide a new way for the utilization of low-rank coal, but also eliminate the influence of ash content on the performance of capacitor. Improve the mass specific capacity of EDLC (hereinafter referred to as specific capacitance), energy density and other electrochemical properties. The relationship between the preparation process of coal-free activated carbon and the pore structure and electrochemical performance of activated carbon (ACs) was systematically investigated. By comparing the parameters of raw coal based activated carbon (Coal-ACs) and ashless coal based activated carbon (HPC-ACs), the influence of ash on the pore structure and electrochemical performance of ACs was analyzed. Acs were prepared by direct activation method and carbonization activation method respectively. The activation temperature (AT), activation time (At), alkali coal ratio (K / C), carbonization time (Ct) and carbonization temperature (CT) were adjusted during the preparation process. The effects of preparation conditions on pore structure and electrochemical properties of ACs were analyzed. The effects of specific surface area, mesopore ratio and pore size distribution on the specific capacitance of ACs were discussed. The results show that ashless coal is a good raw material for the preparation of EDLC electrode materials. The ash content of ACs prepared from low-rank coal-free coal is only 0.36, and its specific capacitance and ratio are higher than that of raw coal-based activated carbon. ACS with different pore size distribution can be obtained by changing the preparation conditions of ACs. The activated carbon with a specific surface area of 1473 m2 / g and a pore size of 0.58 ~ 0.73 nm can be obtained from lignite-based ash free coal at an AT of 600 鈩，
本文编号：2152171
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