化工学报 ›› 2020, Vol. 71 ›› Issue (6): 2735-2742.DOI: 10.11949/0438-1157.20200071
王赫1(),秦楠2,3,郭鑫2,3,郑俊生2,3(),赵基钢1()
收稿日期:
2020-01-17
修回日期:
2020-04-08
出版日期:
2020-06-05
发布日期:
2020-06-05
通讯作者:
郑俊生,赵基钢
作者简介:
王赫(1993—),男,硕士研究生,基金资助:
He WANG1(),Nan QIN2,3,Xin GUO2,3,Junsheng ZHENG2,3(),Jigang ZHAO1()
Received:
2020-01-17
Revised:
2020-04-08
Online:
2020-06-05
Published:
2020-06-05
Contact:
Junsheng ZHENG,Jigang ZHAO
摘要:
以浓硫酸和浓硝酸为氧化剂,采用超声氧化法对硬碳进行表面氧化处理,并研究其作为锂离子超级电容器负极材料的电化学性能。采用扫描电镜、X射线衍射和X射线光电子能谱等表征手段研究了超声氧化处理对硬碳形貌、结构以及表面含氧官能团相对含量的影响。采用恒电流充放电、循环伏安法及交流阻抗法等电化学测试手段对处理前后硬碳的电化学性能进行研究。结果表明:超声氧化处理能在硬碳表面引入适量的含氧官能团,添加额外的活性中心,提高电子迁移率,进而提高硬碳材料的电化学性能。半电池测试中,在2 A·g-1的高电流密度下,氧化硬碳的比容量是未处理硬碳的2倍,具有优秀的倍率性能。以氧化硬碳负极和活性炭正极制备出锂离子电容器,能量密度为37.6 W·h·kg-1,功率密度可达9415 W·kg-1,在1.0 A·g-1电流密度下,经过4000次充放电循环后,容量保持率为99.1%,具有良好的循环稳定性。
中图分类号:
王赫, 秦楠, 郭鑫, 郑俊生, 赵基钢. 锂离子电容器硬碳负极材料的表面改性及其电化学性能研究[J]. 化工学报, 2020, 71(6): 2735-2742.
He WANG, Nan QIN, Xin GUO, Junsheng ZHENG, Jigang ZHAO. Surface modification and electrochemical properties of hard carbon anode material for lithium ion capacitors[J]. CIESC Journal, 2020, 71(6): 2735-2742.
Sample | C—C | C—O | CO | O—CO |
---|---|---|---|---|
HC | 75.9 | 12.7 | 3.8 | 7.5 |
OHC | 70.7 | 13.6 | 7.2 | 8.3 |
表1 HC和OHC不同官能团相对含量/%
Table 1 Relative content of different functional groups of HC and OHC/%
Sample | C—C | C—O | CO | O—CO |
---|---|---|---|---|
HC | 75.9 | 12.7 | 3.8 | 7.5 |
OHC | 70.7 | 13.6 | 7.2 | 8.3 |
Sample | k1/(mA·s·mV-1) | k2/(mA·s1/2·mV-1/2) | (k1/k2)/(s1/2·mV-1/2) |
---|---|---|---|
HC | 1.67 | 1.30 | 1.28 |
OHC | 1.91 | 1.15 | 1.66 |
表2 不同电极的k1和k2系数
Table 2 k1 and k2 coefficients for different electrodes
Sample | k1/(mA·s·mV-1) | k2/(mA·s1/2·mV-1/2) | (k1/k2)/(s1/2·mV-1/2) |
---|---|---|---|
HC | 1.67 | 1.30 | 1.28 |
OHC | 1.91 | 1.15 | 1.66 |
Sample | R0/Ω | RSEI/ Ω | RCT/ Ω | D(Li+)/(cm2·s-1) |
---|---|---|---|---|
HC | 4.185 | 30.88 | 61.65 | 4.45-8 |
OHC | 4.939 | 26.06 | 17.77 | 6.36-8 |
表3 HC和OHC的EIS拟合参数
Table 3 Fitting EIS parameters of HC and OHC
Sample | R0/Ω | RSEI/ Ω | RCT/ Ω | D(Li+)/(cm2·s-1) |
---|---|---|---|---|
HC | 4.185 | 30.88 | 61.65 | 4.45-8 |
OHC | 4.939 | 26.06 | 17.77 | 6.36-8 |
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